Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a power regulation and control method and a system for the operation of a power distribution network by using pressureless diversion type small hydropower stations, which are used for carrying out normalization processing on the output regulation capacity indexes of the small hydropower stations in a high-water period and a low-water period to obtain dimensionless conversion coefficients of related parameters, respectively constructing regulation capacity functions of the small hydropower stations in the high-water period and the low-water period according to the dimensionless conversion coefficients, and carrying out objective and accurate evaluation on the output regulation capacity, and reducing the parameter quantity related to the evaluation indexes and complexity after normalization processing.
The technical aim of the invention is realized by the following technical scheme:
In a first aspect, a power regulation and control method for participating in operation of a power distribution network by pressureless diversion type small water power is provided, which comprises the following steps:
acquiring related parameters of a small hydropower station water storage space, related parameters of power generation of a small hydropower station unit and output force before small hydropower station adjustment;
According to the related parameters of the small hydropower station water storage space and the related parameters of the small hydropower station unit power generation, the power output adjustment capability indexes of the small hydropower station in the water-rich period and the water-lack period are evaluated and analyzed;
Normalizing the output adjustment capability indexes of the small hydropower station in the water-increasing period and the water-losing period to obtain dimensionless conversion coefficients of related parameters;
Respectively constructing an adjusting capability function of the small hydropower station in a water-rich period and a water-lack period according to the dimensionless conversion coefficient;
Screening out small hydropower stations meeting the requirement of the adjusting time according to the adjusting capacity function to serve as target small hydropower stations;
calculating the corresponding adjusting intensity of each target small hydropower station when the adjusting time requirement is met, wherein the priority of the target small hydropower station with small adjusting intensity in the power regulation of the operation of the power distribution network is high;
and calculating the output after the adjustment of the target small hydropower station by combining the adjustment strength of the target small hydropower station and the output before adjustment.
Further, the calculation expression of the dimensionless transformation coefficient specifically includes:
Wherein Q2 represents inflow flow of small hydropower water storage space, k represents a first dimensionless conversion coefficient, the value range of k >0;Q1max represents maximum power generation flow of the small hydropower unit, Q1 represents power generation flow of the small hydropower water, alpha represents a second dimensionless conversion coefficient, the value range of alpha is more than or equal to 0 and less than or equal to 1;V represents maximum water storage, Tc represents time required for filling maximum water storage V with maximum power generation flow Q1max, V1 represents water storage already, beta represents a third dimensionless conversion coefficient, and the value range of beta is more than or equal to 0 and less than or equal to 1;V2 represents water storage to be stored.
Further, the expression of the adjusting capability function is specifically:
Wherein T+max represents the maximum up-regulation time of the small hydropower maintenance power regulation, and T-max represents the maximum down-regulation time of the small hydropower maintenance power regulation.
Further, the expression for adjusting the intensity is specifically:
wherein λ represents the adjustment intensity and γ represents the intensity parameter.
Further, if the target small hydropower station is in the underwater period, the output calculation formula of the target small hydropower station after adjustment is specifically:
Wherein, theThe power of the ith small hydropower station after adjustment is represented by Pi, the output of the ith small hydropower station before adjustment is represented by gammai, and the adjustment strength of the ith small hydropower station is represented by gammai.
Further, if the target small hydropower station is in the water-rich period, the output calculation formula of the target small hydropower station after participating in the power up-regulation adjustment of the power distribution network is specifically as follows:
Wherein, theThe method comprises the steps of adjusting power of an ith small hydropower station, Pi, delta P, Si, m and the number of small hydropower stations with upward adjustment capability in a target small hydropower station, wherein the power of the ith small hydropower station is adjusted, Pi is the output of the ith small hydropower station before adjustment, delta P is the overall power adjustment requirement of the power distribution network, delta P is larger than zero and indicates the small hydropower station to increase the output, delta P is smaller than zero and indicates the small hydropower station to decrease the output, Si is the rated capacity of the ith small hydropower station, and m is the number of small hydropower stations with upward adjustment capability in the target small hydropower station.
Further, if the target small hydropower station is in the water-rich period, the output calculation formula of the target small hydropower station after participating in the downward power adjustment of the power distribution network is specifically as follows:
Wherein, theThe method comprises the steps of adjusting power of an ith small hydropower station, Pi, delta P, Si, n and n, wherein the power of the ith small hydropower station is adjusted, the Pi is the output of the ith small hydropower station before adjustment, the delta P is the overall power adjustment requirement of the power distribution network, the delta P is larger than zero, the small hydropower station is required to increase the output, the delta P is smaller than zero, the small hydropower station is required to decrease the output, the Si is the rated installed capacity of the ith small hydropower station, and the n is the quantity of the small hydropower stations with adjustment capability in the area power distribution network.
In a second aspect, a power regulation and control system for participating in operation of a power distribution network by pressureless diversion type small water power is provided, and the system is used for realizing the power regulation and control method for participating in operation of the power distribution network by pressureless diversion type small water power according to any one of the first aspects, and the power regulation and control system comprises:
The parameter acquisition module is used for acquiring the related parameters of the small hydropower station water storage space, the related parameters of the small hydropower station power generation and the output force before the small hydropower station is regulated;
The index evaluation module is used for evaluating and analyzing the output adjustment capability index of the small hydropower station in the water-rich period and the water-lack period according to the relevant parameters of the small hydropower station water storage space and the relevant parameters of the small hydropower station power generation;
the conversion processing module is used for carrying out normalization processing on the output adjustment capability indexes of the small hydropower station in the high water period and the low water period to obtain dimensionless conversion coefficients of related parameters;
The function construction module is used for respectively constructing the adjusting capability functions of the small hydropower station in the water-rich period and the water-lack period according to the dimensionless conversion coefficients;
The target screening module is used for screening out small hydropower stations meeting the requirement of the adjusting time according to the adjusting capacity function to serve as target small hydropower stations;
The intensity calculation module is used for calculating the corresponding adjusting intensity of each target small hydropower station when the adjusting time requirement is met, and the priority of the target small hydropower station with small adjusting intensity in the power regulation of the operation of the power distribution network is high;
And the power calculation module is used for calculating the output after the adjustment of the target small hydropower station by combining the adjustment strength of the target small hydropower station and the output before adjustment.
In a third aspect, a computer terminal is provided, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the power regulation method for pressureless diversion type small water-electricity participation in power distribution network operation according to any one of the first aspects when executing the program.
In a fourth aspect, a computer readable medium is provided, on which a computer program is stored, the computer program being executed by a processor to implement a power regulation method for pressureless diversion type small hydroelectric participation in operation of a power distribution network according to any of the first aspects.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the power regulation and control method for the pressureless diversion type small hydropower station participating in the operation of the power distribution network, provided by the invention, the output regulation capacity indexes of the small hydropower station in the water-rich period and the water-lack period are normalized to obtain dimensionless conversion coefficients of related parameters, and the regulation capacity functions of the small hydropower station in the water-rich period and the water-lack period are respectively constructed according to the dimensionless conversion coefficients, so that on one hand, the output regulation capacity can be objectively and accurately evaluated, and on the other hand, the parameter quantity related to the evaluation indexes can be reduced after the normalization treatment, and the complexity is reduced;
2. According to the invention, the relation between the small hydropower station regulating quantity and the normal output is considered to calculate the regulating intensity of each small hydropower station, so that the priorities of a plurality of small hydropower stations participating in regulation can be definitely determined, the quick selection of the regulating targets is realized, and the service life of the small hydropower stations is prolonged;
3. When the adjusting object is a plurality of hydroelectric units, the invention can reasonably distribute small hydropower stations to participate in the power up-and-down adjustment of the power distribution network in the underwater period and the rich water period according to the intensity parameters for determining the adjusting intensity, thereby realizing the optimization treatment of the overall adjusting benefit.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
The embodiment 1 is a power regulation and control method for participating in operation of a power distribution network by pressureless diversion type small water power, as shown in fig. 1, comprising the following steps:
S1, acquiring related parameters of a small hydropower station water storage space, related parameters of a small hydropower station power generation unit and output force before small hydropower station adjustment;
s2, evaluating and analyzing the output adjustment capability index of the small hydropower station in the water-rich period and the water-lack period according to the related parameters of the small hydropower station water storage space and the related parameters of the small hydropower station power generation;
S3, carrying out normalization processing on the output adjustment capability indexes of the small hydropower station in the water-increasing period and the water-lack period to obtain dimensionless conversion coefficients of related parameters;
s4, respectively constructing an adjusting capability function of the small hydropower station in a water-rich period and a water-lack period according to the dimensionless conversion coefficient;
S5, screening out small hydropower stations meeting the requirement of the adjusting time according to the adjusting capacity function to serve as target small hydropower stations;
S6, calculating the corresponding adjusting intensity of each target small hydropower station when the adjusting time requirement is met, wherein the target small hydropower station with small adjusting intensity participates in the priority of power regulation of the operation of the power distribution network;
And S7, calculating the adjusted output of the target small hydropower station by combining the adjusting strength of the target small hydropower station and the output before adjustment.
In step S1, the water storage space of the small hydropower station includes links with water storage capacity such as a front pool, a diversion river, a reservoir and the like. The parameters to be obtained include the maximum water storage V (the amount of electricity generation water storable in all water storage spaces of the small hydropower station: cubic meters), the stored water V1 (the stored water amount in the small hydropower station water storage space at a certain adjustment calculation time t: cubic meters), and the to-be-stored water V2 (the amount of water remaining in the small hydropower station water storage space at a certain adjustment calculation time t: cubic meters). The relationship between the three is as follows, v=v1+V2.
The inflow flow rate of the small hydropower storage space is Q2 (the inflow amount of the small hydropower storage space at the time t is per cubic meter/second), and the power generation flow rate of the small hydropower is Q1 (the outflow amount of the small hydropower storage space at the time t, namely, the flow rate for power generation is per cubic meter/second).
The maximum power generation power Pmax of the small hydroelectric generating set is that the corresponding power generation flow is the maximum power generation flow Q1max, the relation between the power generation flow and the small hydroelectric generating set is Pmax＝g×Q1max Xh x eta, wherein g is a gravitational acceleration constant (unit: m/s2), h is the water head height (unit: m) of the hydroelectric generating set, and eta is the power generation efficiency of the generating set. For a certain small hydroelectric generating set, h and eta are fixed values.
In step S2, the invention distinguishes two stages of the water-rich period and the water-free period, and establishes a quantitative calculation relation from the up-regulating force, the down-regulating force and the corresponding maximum regulating time respectively.
1. Calculation of small water power regulation capacity in water-rich period
The water-increasing period refers to the period that the inflow flow Q2 of the small water-electricity water storage space is larger than the maximum power generation flow Q1max, and the quantity relationship of Q1、Q1max、Q2 is as follows, namely Q1≤Q1max<Q2.
Because the inflow is greater than the maximum power generation flow, the small hydropower station will be at the maximum water storage, and the water storage to be 0, namely: at this time, waste water is generated, and the waste water flow Qa is Qa＝Q2-Q1.
(1) Calculation of adjustment capability on small hydropower output in water-increasing period
The up-regulating capability refers to the maximum output which can be improved and the sustainable output time under a new output level when the small hydroelectric generating set calculates the regulating capability. The maximum pull-up force range ΔP+max may be expressed as ΔP+max＝Pmax-P1.
The maximum continuous output time T+max is infinite because the small hydropower station can be continuously satisfied to maintain the maximum power generation in the period of high water. After the output is adjusted upwards, the water discharge flow of the small hydropower station is reduced, and the water discharge flow Qa at the moment is Qa＝Q2-Q1max.
(2) Calculation of small hydropower down-regulation capacity in water-rich period
The down-regulation capability refers to the maximum output of the small hydroelectric generating set which can be reduced by pressure and the sustainable output time under the new output level when the adjustment capability is calculated. The maximum pull-up force range ΔP-max may be expressed as ΔP-max＝P1.
In the extreme case, the small hydropower can be turned off, and the down-regulating capacity at the moment is the generated power P1 corresponding to the calculation moment, and the down-regulating time T-max corresponding to the calculation moment is infinity. After the output is adjusted downwards, the water discharge flow of the small hydropower station is increased, and the water discharge flow Qa at the moment is Qa＝Q2.
2. Calculation of small water power regulation capacity in underwater period
The water shortage period is that the inflow flow Q2 of the small water-electricity water storage space is smaller than the maximum power generation flow Q1max, and in the water shortage period, in order to fully utilize water resources to realize electric energy conversion, when no power output regulation is required, the power generation flow can be set as the inflow flow, namely Q1＝Q2.
The generated power P at this time can be expressed as Pq＝g×Q1 ×h×η. In the period of water shortage, all force adjustment is based on the principle that no water abandon occurs unless a special emergency situation exists.
(1) Calculation of adjustment capability on small hydropower output in underwater period
The power generation flow corresponding to the small water power after the water shortage period is up-regulated is Q1, and the power generation flow meets the following relationship Q2<Q1≤Q1max.
The corresponding maximum adjustment time T+max can be expressed as: If the up-regulation time exceeds T+max, the small hydropower will lose the capacity of up-regulation of the output, and the output returns to the output matched with the inflow flow Q2 of the water storage space.
(2) Calculation of adjustment capability under small hydropower output in underwater period
The power generation flow corresponding to the small water power after the water shortage period is up-regulated is Q1, and the power generation flow meets the following relationship Q1<Q2.
The corresponding maximum adjustment time T-max can be expressed as:
in step S3, because there are differences between absolute values such as flow, storage capacity, installed capacity, etc. between different small hydropower stations, in order to realize the comparison of different small hydropower stations with the same scale, the calculation method of the small hydropower stations is normalized.
Based on Q1max, let:
Wherein k represents a first dimensionless conversion coefficient, the value range is k >0, when 0< k <1, the small hydropower station is in the underwater period, when k is more than or equal to 1, the small hydropower station is in the high water period, alpha represents a second dimensionless conversion coefficient, the value range is more than or equal to 0 and less than or equal to 1;Tc, the time required for filling the maximum water storage volume V with the maximum power generation flow Q1max is represented, and beta represents a third dimensionless conversion coefficient, the value range is more than or equal to 0 and less than or equal to 1.
In step S4, the adjustment capability function expression after the maximum up-adjustment and down-adjustment times in the water-rich period and the water-lack period are normalized respectively is:
Wherein T+max represents the maximum up-regulation time of the small hydropower maintenance power regulation, and T-max represents the maximum down-regulation time of the small hydropower maintenance power regulation.
The evaluation and calculation methods of the water-rich period and the water-lack period are unified and normalized, and the adjustment capability of the small hydroelectric generating set under different installation machines and different periods is calculated under the same scale.
In step S5, whether the small hydropower station participates in power adjustment of the power distribution network needs to be considered, and not only the output condition of the small hydropower station, but also the duration of continuous output of the small hydropower station needs to be considered. Therefore, the adjustment capability function is needed to solve the time of maintaining the power adjustment of each small hydropower station, and the small hydropower station meeting the adjustment time requirement is screened out as the target small hydropower station.
In step S6, the calculation form of the small water power adjustment capability in the high water period is simple, but the calculation method of the low water period includes four variables of α, β, k and Tc, so as to facilitate the calculation of the small water power adjustment capability in the low water period, further integrate and optimize the calculation parameters in the low water period, and make:
The maximum up-and down-turn time of the underdrain period may be further reduced to:
The regulating strength is defined as I1-gamma I, and the larger the numerical value is, the larger the regulating change of the output of the small hydropower is, and the larger the influence on the normal power generation of the small hydropower is. The larger T+max and T-max represent the longer the small hydropower station can sustain power regulation at a certain regulation strength, the longer the regulation time.
Therefore, the expression for adjusting the intensity is specifically λ= |1- γ|,Wherein λ represents the adjustment intensity and γ represents the intensity parameter.
In step S7, the small hydropower station with the adjustment capability can be used to meet the adjustment requirement when the load or the photovoltaic output changes, and the small hydropower station adjustment participation in the operation of the power distribution network is optimized based on the evaluation of the small hydropower station adjustment capability in the previous step, and is divided into two types of underwater period and high water period. The number of small hydropower stations with the adjusting capability in the regional distribution network is assumed to be n, and the rated installed capacity of each small hydropower station is Si, i epsilon [1, n ]. And assuming that the overall power regulation requirement of the power distribution network is delta P, wherein delta P is larger than zero, the small water power increase output is required by the regional power distribution network, delta P is smaller than zero, the small water power decrease output is required by the regional power distribution network, and the regulation time requirement is Tt.
(1) Small water-electricity power participating in power up-regulation of power distribution network in underwater period
The upward adjustment strength corresponding to each small hydropower station when the adjustment time Tt is satisfied is calculated. Each small hydropower conditioning strength lambdai can be expressed as:
Wherein, gammai、βi、ξi is the gamma, beta, zeta parameter corresponding to the i-th small hydropower station, and the lambdai corresponding to each small hydropower station is ordered from small to large, and the small hydropower station with small adjusting intensity is preferentially adjusted.
The power of the ith small hydropower station after adjustment isCan be expressed as:
wherein, Pi is the output of the ith small hydropower station before adjustment.
(2) Small water-electricity power participating in power down regulation of distribution network in underwater period
The corresponding downward adjustment strength of each small hydropower station when the adjustment time Tt is satisfied is calculated. The individual small hydropower conditioning intensities lambdai at this time can be expressed as:
the power of the ith small hydropower station after adjustment isCan be expressed as:
(3) Small water-electricity power participating power up-regulation of power distribution network in high water period
Judging whether each small hydropower station is in the maximum power generation output or not, and if a certain small hydropower station is in the maximum output state, the small hydropower station cannot participate in power up-regulation. Assuming that m seats in the n seats of small hydropower stations still have upward adjustment capability, wherein m is less than or equal to n, upward adjustment force of the m seats of small hydropower stations is distributed according to the installed capacity proportion, and the power required to be adjusted by each small hydropower station is delta Pi, i epsilon [1, m ], wherein:
the power of the ith small hydropower station after adjustment isCan be expressed as:
(4) Small water-electricity power participating power down regulation of distribution network in high water period
The whole power regulation requirement of the regional distribution network is required to be distributed to each small hydropower station unit, the distribution is carried out according to the rated installed capacity ratio of each unit, and the power required to be regulated by each small hydropower station is delta Pi, i epsilon [1, n ]. Wherein:
the power of the ith small hydropower station after adjustment isCan be expressed as:
Embodiment 2. The system is used for realizing the power regulation method of the pressureless diversion type small water-electricity participation power distribution network operation, as shown in fig. 2, and comprises a parameter acquisition module, an index evaluation module, a conversion processing module, a function construction module, a target screening module, an intensity calculation module and a power calculation module.
The system comprises a parameter acquisition module, an index evaluation module, a conversion processing module, a function construction module, a target screening module, an intensity calculation module and a power calculation module, wherein the parameter acquisition module is used for acquiring related parameters of a small hydropower water storage space, related parameters of a small hydropower unit and output power before small hydropower adjustment, the index evaluation module is used for evaluating and analyzing output power adjustment capability indexes of the small hydropower water in a high-water period and an under-water period according to the related parameters of the small hydropower water storage space and the related parameters of the small hydropower unit, the conversion processing module is used for carrying out normalization processing on the output power adjustment capability indexes of the small hydropower water in the high-water period and the under-water period to obtain dimensionless conversion coefficients of related parameters, the function construction module is used for respectively constructing adjustment capability functions of the small hydropower water in the high-water period and the under-water period according to the dimensionless conversion coefficients, the target screening module is used for screening out small hydropower water meeting adjustment time requirements according to the adjustment capability functions as target hydropower water, the intensity calculation module is used for calculating adjustment intensity corresponding to each target hydropower water when meeting the adjustment time requirements, the target hydropower water is high in the priority of power adjustment of the power distribution network, and the output calculation module is used for calculating the output after the adjustment of the target hydropower water.
The invention also discloses a computer terminal which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the power regulation method of the pressureless diversion type small water power participation distribution network operation as described in the embodiment 1 when executing the program.
The invention also discloses a computer readable medium, on which a computer program is stored, the computer program being executed by a processor to implement the power regulation method for the pressureless diversion type small hydroelectric participation in the operation of a power distribution network according to the embodiment 1.
The invention carries on the normalization processing to the power output adjustment ability index of the small hydropower station in the period of abundant water and period of underwater, get the dimensionless conversion coefficient of the relevant parameter, and construct the small hydropower station in the period of abundant water, adjustment ability function of period of underwater according to the dimensionless conversion coefficient separately, on one hand can carry on objective, accurate evaluation to the power output adjustment ability, on the other hand can reduce the parameter quantity that the evaluation index involves after the normalization processing, reduce the complexity;
In addition, when the adjusting object is a plurality of hydroelectric generating sets, the invention can reasonably distribute small hydropower stations to participate in the upward and downward power adjustment of the power distribution network in the underwater period and the rich water period according to the intensity parameters for determining the adjusting intensity, thereby realizing the optimization treatment of the overall adjusting benefit.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.