技术领域technical field
本发明涉及双馈感应风电机的能量传输领域，具体是涉及一种降低双馈感应风电机组并网的网损微增率方法。The invention relates to the field of energy transmission of a doubly-fed induction wind turbine, in particular to a method for reducing the slight increase rate of network loss of a doubly-fed induction wind turbine connected to a grid.
背景技术Background technique
目前，在风力发电领域，运用较多的是异步风电机组、双馈感应风电机组等。由于双馈感应风电机转子独立供电，具有一定的无功调节能力，且在一定程度上能灵活控制功率，成本较低，因此得到了广泛的应用。At present, in the field of wind power generation, asynchronous wind turbines and double-fed induction wind turbines are widely used. Due to the independent power supply of the double-fed induction wind turbine rotor, it has a certain reactive power adjustment capability, and can flexibly control the power to a certain extent, and the cost is low, so it has been widely used.
由于风能具有很大的随机性，所以导致风力发电也具有很大的随机性与不稳定性。双馈感应风电机并网之后，会引起很多复杂的问题。选择一个合适的并网点对于大规模风电输送具有至关重要的意义。Due to the great randomness of wind energy, wind power generation also has great randomness and instability. After the double-fed induction wind turbine is connected to the grid, it will cause many complicated problems. Selecting a suitable grid-connected point is crucial for large-scale wind power transmission.
现有的算法仅仅考虑接入点节点电压和系统频率随时间的波动，从而确立接入点位置，此类算法没有将风速对于接入点节点电压以及网损微增率的影响考虑在内，因而确定的接入点并不是最佳接入点，网损微增率以及电压波动较大，从而导致输电损耗较大，这对于实现后续的能量输送效率最大化是不够的。The existing algorithms only consider the fluctuation of the node voltage of the access point and the system frequency over time to establish the location of the access point. Such algorithms do not take into account the influence of wind speed on the node voltage of the access point and the slight increase rate of network loss. Therefore, the determined access point is not the best access point, and the network loss micro-increase rate and voltage fluctuation are large, resulting in large transmission loss, which is not enough to maximize the subsequent energy transmission efficiency.
发明内容Contents of the invention
本发明所要解决的技术问题是，克服上述背景技术的不足，提供一种降低双馈感应风电机组并网的网损微增率方法，能够综合能量的角度来确定最优接入点，从而提高输电效率。The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned background technology, and provide a method for reducing the network loss micro-increase rate of doubly-fed induction wind turbines connected to the grid, which can determine the optimal access point from the perspective of comprehensive energy, thereby improving power transmission efficiency.
本发明解决其技术问题采用的技术方案是，一种降低双馈感应风电机组并网的网损微增率方法，包括以下步骤：The technical solution adopted by the present invention to solve the technical problem is a method for reducing the slight increase rate of network loss of doubly-fed induction wind turbines connected to the grid, comprising the following steps:
（1）建立双馈感应风电机组潮流模型；(1) Establish the power flow model of the doubly-fed induction wind turbine;
（2）计算双馈感应风电机组潮流模型在MPPT方式下，在不同接入点的网损微增率及节点电压；(2) Calculate the network loss micro-increase rate and node voltage at different access points of the power flow model of the doubly-fed induction wind turbine in the MPPT mode;
（3）综合比较步骤（2）所得到的结果，确定网损微增率最小和节点电压最稳定的点为最佳接入点。(3) Comprehensively compare the results obtained in step (2), and determine the point with the smallest network loss micro-increase rate and the most stable node voltage as the best access point.
进一步，步骤（1）中，建立双馈感应风电机组潮流模型的具体过程如下：Further, in step (1), the specific process of establishing the power flow model of the doubly-fed induction wind turbine is as follows:
（1-1）建立风力机机械功率模型：确定风力机捕捉的机械功率与风速之间的关系，，其中，为空气密度，—为风力机的扫风面积，为风速，为风能转换系数；(1-1) Establish a wind turbine mechanical power model: determine the mechanical power captured by the wind turbine and wind speed The relationship between, ,in, is the air density, — is the sweeping area of the wind turbine, is the wind speed, is the wind energy conversion coefficient;
的表达式为， The expression is ,
其中，～为系数项，为中间变量，为叶尖速比，为风力机的转速；结合双馈感应风电机典型有功特性曲线图确保双馈感应风电机工作在MPPT方式下；in, ~ is the coefficient item, as an intermediate variable, is the tip speed ratio, is the speed of the wind turbine; combined with the typical active characteristic curve of the doubly-fed induction wind motor, it is ensured that the doubly-fed induction wind motor works in the MPPT mode;
（1-2）结合双馈感应风电机的结构图以及等值电路图确定双馈感应风电机功率平衡方程以及转矩平衡方程；功率平衡方程如下：(1-2) Combining the structural diagram and equivalent circuit diagram of the doubly-fed induction wind machine to determine the power balance equation and torque balance equation of the doubly-fed induction wind machine; the power balance equation is as follows:
对于电网的功率平衡：For the power balance of the grid:
=； = ;
=； = ;
式中为有功功率差值，为双馈感应风电机发出的有功功率，为定子节点到励磁回路消耗的有功功率，为定子节点到变流器消耗的有功功率；为无功功率差值，为双馈感应风电机发出的无功功率，为定子节点到励磁回路消耗的无功功率，为定子节点到变流器消耗的无功功率；In the formula is the active power difference, is the active power generated by the doubly-fed induction wind turbine, is the active power consumed from the stator node to the excitation circuit, is the active power consumed from the stator node to the converter; is the reactive power difference, is the reactive power generated by the doubly-fed induction wind turbine, is the reactive power consumed from the stator node to the excitation circuit, is the reactive power consumed from the stator node to the converter;
对于励磁回路的功率平衡：For the power balance of the field circuit:
=； = ;
=； = ;
式中为励磁回路的有功功率差值，为励磁回路到定子的有功功率，为励磁回路到转子的有功功率；励磁回路的无功功率差值，为励磁回路到定子的无功功率，为励磁回路到转子的无功功率；In the formula is the active power difference of the excitation circuit, is the active power from the excitation circuit to the stator, is the active power from the excitation circuit to the rotor; The reactive power difference of the excitation circuit, is the reactive power from the excitation circuit to the stator, is the reactive power from the excitation circuit to the rotor;
对于变流器的功率平衡：For the power balance of the converter:
=； = ;
=； = ;
式中为变流器的有功功率差值，为变流器到定子的有功功率，为转子到励磁回路的有功功率；变流器的无功功率差值，为变流器的额定无功功率，为变流器到转子的无功功率；In the formula is the active power difference of the converter, is the active power from the converter to the stator, is the active power from the rotor to the excitation circuit; The reactive power difference of the converter, is the rated reactive power of the converter, is the reactive power from the converter to the rotor;
转矩平衡方程如下：The torque balance equation is as follows:
=； = ;
式中为转矩差，为双馈感应风电机的额定功率，为转差率，为双馈感应风电机的电磁功率；In the formula is the torque difference, is the rated power of the doubly-fed induction wind turbine, is the slip rate, is the electromagnetic power of the doubly-fed induction wind turbine;
（1-3）在传统的潮流模型的基础上，将（1-2）中的功率平衡方程以及转矩平衡方程作为约束条件，得到修正之后的双馈感应风电机组潮流模型；(1-3) On the basis of the traditional power flow model, the power balance equation and torque balance equation in (1-2) are used as constraints to obtain the revised DFIG power flow model;
； ;
式中，表示电网有功功率变化量，表示电网无功功率变化量，表示励磁回路的有功功率差值；表示励磁回路的无功功率差值；表示变流器的有功功率差值；表示变流器的无功功率差值；表示有功功率差值；表示无功功率差值；表示转矩差；，，和为系数矩阵中的参数；表示系统相角差，表示电网电压差，为励磁回路相角差，为励磁回路电压差，表示变流器相角差，为变流器电压差，表示定子相角差，为定子电压差，表示转子电压差。In the formula, Indicates the variation of grid active power, Indicates the reactive power variation of the grid, Indicates the active power difference of the excitation circuit; Indicates the reactive power difference of the excitation circuit; Indicates the active power difference of the converter; Indicates the reactive power difference of the converter; Indicates active power difference; Indicates the reactive power difference; Indicates the torque difference; , , and is the parameter in the coefficient matrix; Indicates the phase angle difference of the system, Indicates the grid voltage difference, is the phase angle difference of the excitation circuit, is the excitation circuit voltage difference, Indicates the phase angle difference of the converter, is the converter voltage difference, Indicates the stator phase angle difference, is the stator voltage difference, Indicates the rotor voltage difference.
进一步，步骤（2）中，计算双馈感应风电机组潮流模型在MPPT方式下，在不同接入点的网损微增率及节点电压的具体过程如下：Further, in step (2), the specific process of calculating the network loss micro-increase rate and node voltage at different access points in the MPPT mode of the doubly-fed induction wind turbine power flow model is as follows:
（2-1）推导出整体网络损耗的表达式：，其中，表示有功网损，，分别表示节点i,j的电压，表示节点i，j之间的导纳，表示节点i，j之间的相位角；(2-1) Deduce the expression of the overall network loss: ,in, Indicates the active network loss, , represent the voltages of nodes i and j respectively, Indicates the admittance between nodes i, j, Indicates the phase angle between nodes i and j;
（2-2）得到网络损耗关于节点电压的灵敏度：；式中，表示网络损耗关于节点电压的灵敏度，表示有功网损对相位角求导数，表示有功网损对节点电压求导数，表示相角微增量，表示电压微增量；(2-2) Get the sensitivity of network loss with respect to node voltage: ; where, Indicates the sensitivity of the network loss with respect to the node voltage, Indicates the derivative of the active network loss with respect to the phase angle, Indicates the derivative of the active network loss to the node voltage, Indicates the phase angle micro-increment, Indicates the voltage micro-increment;
（2-3）得出网损微增率的计算表达式：；式中，表示网损微增率，，，和为系数矩阵的参数，为有功功率对相角的增量，为有功功率对电压的增量；(2-3) The calculation expression of the network loss slight increase rate is obtained: ; where, Indicates the slight increase rate of network loss, , , and is the parameter of the coefficient matrix, is the increment of active power with respect to the phase angle, is the increment of active power to voltage;
（2-4）通过节点电压表达式，计算得到各节点电压；式中，表示计算得到的节点电压，表示对潮流模型进行计算前该节点的电压，为已知量，为计算得到的电压变化量。(2-4) By node voltage expression , to calculate the voltage of each node; where, represents the calculated node voltage, Indicates the voltage of the node before the calculation of the power flow model, which is a known quantity, is the calculated voltage change.
进一步，步骤（2-2）中，网络损耗关于节点电压的灵敏度生成方法为：Further, in step (2-2), the sensitivity generation method of network loss with respect to node voltage is:
由步骤（2-1）中的表达式分别对和求导，k为任一节点标号，表示标号为k的节点功率角，表示标号为k的节点电压，得到以及，写成矩阵形式，得到网络损耗关于节点电压的灵敏度表达式。By the expression in step (2-1) respectively for and Derivation, k is any node label, Indicates the node power angle labeled k, Denote the node voltage labeled k, get as well as , written in matrix form, the sensitivity expression of network loss with respect to node voltage is obtained .
与现有技术相比，本发明的优点如下：在双馈感应风电机组中，除考虑电压和频率随时间的波动外，还考虑风速对于接入点节点电压以及网损微增率的影响，使双馈感应风电机组潮流模型工作在MPPT（最大功率点跟踪）方式下，在此基础上，建立网损微增率和接入点节点电压关于风速的一个模型，根据不同接入点下的网损微增率以及节点电压随风速的相对变化情况，探究最佳接入点的位置，在双馈感应风电机并网之后，尽可能的获得较小的网损微增率以及电压波动，从而提高输电的效率；本发明将网络损耗关于节点电压的灵敏度和节点电压统一考虑在算法内，不用单独分析，摆脱传统算法判据单一化的限制，能够综合能量的角度来确定最优接入点；本发明算法简单，在实际工程中非常实用。Compared with the prior art, the advantages of the present invention are as follows: In the doubly-fed induction wind turbine, in addition to considering the fluctuation of voltage and frequency with time, the influence of wind speed on the node voltage of the access point and the slight increase rate of network loss is also considered, Make the power flow model of the doubly-fed induction wind turbine work in the MPPT (maximum power point tracking) mode. The slight increase rate of network loss and the relative change of node voltage with wind speed, explore the location of the best access point, and obtain as small a small increase rate of network loss and voltage fluctuation as possible after the doubly-fed induction wind turbine is connected to the grid , so as to improve the efficiency of power transmission; the present invention considers the sensitivity of the network loss to the node voltage and the node voltage in the algorithm, does not need to be analyzed separately, and gets rid of the limitation of the single criterion of the traditional algorithm, and can determine the optimal connection from the perspective of comprehensive energy entry point; the algorithm of the present invention is simple, and it is very practical in actual engineering.
附图说明Description of drawings
图1是本发明实施例的流程图。Fig. 1 is a flowchart of an embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图及具体实施例对本发明作进一步详细描述。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
本实施例包括以下步骤：This embodiment includes the following steps:
（1）建立双馈感应风电机组潮流模型；(1) Establish the power flow model of the doubly-fed induction wind turbine;
（2）计算双馈感应风电机组潮流模型在MPPT（最大功率点跟踪）方式下，在不同接入点的网损微增率及节点电压；(2) Calculate the network loss micro-increase rate and node voltage at different access points of the power flow model of the doubly-fed induction wind turbine in the MPPT (maximum power point tracking) mode;
（3）综合比较步骤（2）所得到的结果，确定网损微增率最小和节点电压最稳定的点为最佳接入点。(3) Comprehensively compare the results obtained in step (2), and determine the point with the smallest network loss micro-increase rate and the most stable node voltage as the best access point.
步骤（1）中，建立双馈感应风电机组潮流模型的具体过程如下：In step (1), the specific process of establishing the power flow model of the doubly-fed induction wind turbine is as follows:
（1-1）建立风力机机械功率模型：确定风力机捕捉的机械功率与风速之间的关系，，其中，为空气密度，—为风力机的扫风面积，为风速，为风能转换系数；(1-1) Establish a wind turbine mechanical power model: determine the mechanical power captured by the wind turbine and wind speed The relationship between, ,in, is the air density, — is the sweeping area of the wind turbine, is the wind speed, is the wind energy conversion coefficient;
的表达式为， The expression is ,
其中，～为系数项，为中间变量，为叶尖速比，为风力机的转速；结合双馈感应风电机典型有功特性曲线图确保双馈感应风电机工作在MPPT方式下；in, ~ is the coefficient term, as an intermediate variable, is the tip speed ratio, is the speed of the wind turbine; combined with the typical active characteristic curve of the doubly-fed induction wind motor, it is ensured that the doubly-fed induction wind motor works in the MPPT mode;
（1-2）结合双馈感应风电机的结构图以及等值电路图确定双馈感应风电机功率平衡方程以及转矩平衡方程；功率平衡方程如下：(1-2) Combining the structural diagram and equivalent circuit diagram of the doubly-fed induction wind machine to determine the power balance equation and torque balance equation of the doubly-fed induction wind machine; the power balance equation is as follows:
对于电网的功率平衡：For the power balance of the grid:
=； = ;
=； = ;
式中为有功功率差值，为双馈感应风电机发出的有功功率，为定子节点到励磁回路消耗的有功功率，为定子节点到变流器消耗的有功功率；为无功功率差值，为双馈感应风电机发出的无功功率，为定子节点到励磁回路消耗的无功功率，为定子节点到变流器消耗的无功功率；In the formula is the active power difference, is the active power generated by the doubly-fed induction wind turbine, is the active power consumed from the stator node to the excitation circuit, is the active power consumed from the stator node to the converter; is the reactive power difference, is the reactive power generated by the doubly-fed induction wind turbine, is the reactive power consumed from the stator node to the excitation circuit, is the reactive power consumed from the stator node to the converter;
对于励磁回路的功率平衡：For the power balance of the field circuit:
=； = ;
=； = ;
式中为励磁回路的有功功率差值，为励磁回路到定子的有功功率，为励磁回路到转子的有功功率；励磁回路的无功功率差值，为励磁回路到定子的无功功率，为励磁回路到转子的无功功率；In the formula is the active power difference of the excitation circuit, is the active power from the excitation circuit to the stator, is the active power from the excitation circuit to the rotor; The reactive power difference of the excitation circuit, is the reactive power from the excitation circuit to the stator, is the reactive power from the excitation circuit to the rotor;
对于变流器的功率平衡：For the power balance of the converter:
=； = ;
=； = ;
式中为变流器的有功功率差值，为变流器到定子的有功功率，为转子到励磁回路的有功功率；变流器的无功功率差值，为变流器的额定无功功率，为变流器到转子的无功功率；In the formula is the active power difference of the converter, is the active power from the converter to the stator, is the active power from the rotor to the excitation circuit; The reactive power difference of the converter, is the rated reactive power of the converter, is the reactive power from the converter to the rotor;
转矩平衡方程如下：The torque balance equation is as follows:
=； = ;
式中为转矩差，为双馈感应风电机的额定功率，为转差率，为双馈感应风电机的电磁功率；In the formula is the torque difference, is the rated power of the doubly-fed induction wind turbine, is the slip rate, is the electromagnetic power of the doubly-fed induction wind turbine;
（1-3）在传统的潮流模型的基础上，将（1-2）中的功率平衡方程以及转矩平衡方程作为约束条件，得到修正之后的双馈感应风电机组潮流模型；(1-3) On the basis of the traditional power flow model, the power balance equation and torque balance equation in (1-2) are used as constraints to obtain the revised DFIG power flow model;
； ;
式中，表示电网有功功率变化量，表示电网无功功率变化量，表示励磁回路的有功功率差值；表示励磁回路的无功功率差值；表示变流器的有功功率差值；表示变流器的无功功率差值；表示有功功率差值；表示无功功率差值；表示转矩差；，，和为系数矩阵中的参数；表示系统相角差，表示电网电压差，为励磁回路相角差，为励磁回路电压差，表示变流器相角差，为变流器电压差，表示定子相角差，为定子电压差，表示转子电压差。In the formula, Indicates the variation of grid active power, Indicates the reactive power variation of the grid, Indicates the active power difference of the excitation circuit; Indicates the reactive power difference of the excitation circuit; Indicates the active power difference of the converter; Indicates the reactive power difference of the converter; Indicates active power difference; Indicates the reactive power difference; Indicates the torque difference; , , and is the parameter in the coefficient matrix; Indicates the phase angle difference of the system, Indicates the grid voltage difference, is the phase angle difference of the excitation circuit, is the excitation circuit voltage difference, Indicates the phase angle difference of the converter, is the converter voltage difference, Indicates the stator phase angle difference, is the stator voltage difference, Indicates the rotor voltage difference.
步骤（2）中，计算双馈感应风电机组潮流模型在MPPT方式下，在不同接入点的网损微增率及节点电压的具体过程如下：In step (2), the specific process of calculating the network loss micro-increase rate and node voltage at different access points of the power flow model of the doubly-fed induction wind turbine in the MPPT mode is as follows:
（2-1）推导出整体网络损耗的表达式：，其中，表示有功网损，，分别表示节点i,j的电压，表示节点i，j之间的导纳，表示节点i，j之间的相位角；(2-1) Deduce the expression of the overall network loss: ,in, Indicates the active network loss, , represent the voltages of nodes i and j respectively, Indicates the admittance between nodes i, j, Indicates the phase angle between nodes i and j;
（2-2）得到网络损耗关于节点电压的灵敏度：；式中，表示网络损耗关于节点电压的灵敏度，表示有功网损对相位角求导数，表示有功网损对节点电压求导数，表示相角微增量，表示电压微增量；(2-2) Get the sensitivity of network loss with respect to node voltage: ; where, Indicates the sensitivity of the network loss with respect to the node voltage, Indicates the derivative of the active network loss with respect to the phase angle, Indicates the derivative of the active network loss to the node voltage, Indicates the phase angle micro-increment, Indicates the voltage micro-increment;
（2-3）得出网损微增率的计算表达式：；式中，表示网损微增率，，，和为系数矩阵的参数，为有功功率对相角的增量，为有功功率对电压的增量；(2-3) The calculation expression of the network loss slight increase rate is obtained: ; where, Indicates the slight increase rate of network loss, , , and is the parameter of the coefficient matrix, is the increment of active power with respect to the phase angle, is the increment of active power to voltage;
（2-4）通过节点电压表达式，计算得到各节点电压；式中，表示计算得到的节点电压，表示对潮流模型进行计算前该节点的电压，为已知量，为计算得到的电压变化量。(2-4) By node voltage expression , to calculate the voltage of each node; where, represents the calculated node voltage, Indicates the voltage of the node before the calculation of the power flow model, which is a known quantity, is the calculated voltage change.
步骤（2-2）中，网络损耗关于节点电压的灵敏度生成方法为：In step (2-2), the sensitivity generation method of network loss with respect to node voltage is:
由步骤（2-1）中的表达式分别对和求导，k为任一节点标号，表示标号为k的节点功率角，表示标号为k的节点电压，得到以及，写成矩阵形式，得到网络损耗关于节点电压的灵敏度表达式。By the expression in step (2-1) respectively for and Derivation, k is any node label, Indicates the node power angle labeled k, Denote the node voltage labeled k, get as well as , written in matrix form, the sensitivity expression of network loss with respect to node voltage is obtained .
在双馈感应风电机组中，除了考虑电压和频率随时间的波动外，还需要考虑风速对于接入点节点电压以及网损微增率的影响。这就需要得到网损微增率以及节点电压与风速的关系。In the double-fed induction wind turbine, in addition to considering the fluctuation of voltage and frequency over time, the influence of wind speed on the node voltage of the access point and the slight increase rate of network loss also needs to be considered. This requires obtaining the relationship between the slight increase rate of network loss and the node voltage and wind speed.
在最大功率点跟踪（MPPT）方式下，双馈感应风电机并网后，随着风力的增大，其有功出力随之增大，对于无功出力，则可以近似的认为其保持不变，但节点的电压随着风速的不同，必然还是会有一定的波动。此外，网损微增率以及节点电压与双馈感应风电机的接入位置也有关系。可以通过建立风速与系统有功损耗的关系，结合接入点的不同对于接入点节点电压在不同风速下的影响，确立最佳的接入点，以降低输电损耗。In the maximum power point tracking (MPPT) mode, after the doubly-fed induction wind turbine is connected to the grid, its active output increases with the increase of wind force, and its reactive output can be approximately considered to remain unchanged. However, the voltage of the nodes will inevitably fluctuate with the wind speed. In addition, the network loss micro-increase rate and node voltage are also related to the connection position of the doubly-fed induction wind turbine. By establishing the relationship between wind speed and system active power loss, and combining the influence of different access points on the node voltage of the access point at different wind speeds, the best access point can be established to reduce transmission loss.
本实施例的具体流程如下：The concrete process of this embodiment is as follows:
步骤01：建立风力机机械功率模型；Step 01: Establish a wind turbine mechanical power model;
步骤02：确定双馈感应风电机功率平衡方程以及转矩平衡方程；Step 02: Determine the power balance equation and torque balance equation of the DFIG;
步骤03：在传统的潮流模型的基础上，将步骤03中的功率平衡方程以及转矩平衡方程作为约束条件，得到修正之后的双馈感应风电机组潮流模型；Step 03: On the basis of the traditional power flow model, use the power balance equation and torque balance equation in step 03 as constraints to obtain the revised DFIG power flow model;
步骤04：计算双馈感应风电机组潮流模型在MPPT方式下，在不同接入点的网损微增率及节点电压；Step 04: Calculate the network loss micro-increase rate and node voltage at different access points of the power flow model of the doubly-fed induction wind turbine in the MPPT mode;
步骤05：执行计算任务，得到计算结果；Step 05: Execute calculation tasks and obtain calculation results;
步骤06：确定最佳接入点。Step 06: Determine the best access point.
本发明在双馈感应风电机组中，除了考虑电压和频率随时间的波动外，还考虑风速对于接入点节点电压以及网损微增率的影响。使双馈感应风电机组潮流模型工作在MPPT（最大功率点跟踪）方式下，在此基础上，建立网损微增率和接入点节点电压关于风速的一个模型，根据不同接入点下的网损微增率以及节点电压随风速的相对变化情况，探究最佳接入点的位置，在双馈感应风电机并网之后，尽可能的获得较小的网损微增率以及电压波动，从而提高输电的效率。In the doubly-fed induction wind turbine, the present invention not only considers the fluctuation of voltage and frequency with time, but also considers the influence of wind speed on the node voltage of the access point and the slight increase rate of network loss. Make the power flow model of the doubly-fed induction wind turbine work in the MPPT (maximum power point tracking) mode. The slight increase rate of network loss and the relative change of node voltage with wind speed, explore the location of the best access point, and obtain as small a small increase rate of network loss and voltage fluctuation as possible after the doubly-fed induction wind turbine is connected to the grid , so as to improve the efficiency of power transmission.
本发明将网络损耗关于节点电压的灵敏度和节点电压统一考虑在算法内，不用单独分析，摆脱传统算法判据单一化的限制，能够综合能量的角度来确定最优接入点；本发明算法简单，在实际工程中非常实用。The present invention takes the sensitivity of the network loss about the node voltage and the node voltage into the algorithm, does not need to be analyzed separately, gets rid of the limitation of the single criterion of the traditional algorithm, and can determine the optimal access point from the perspective of comprehensive energy; the algorithm of the present invention is simple , which is very practical in practical engineering.
本领域的技术人员可以对本发明实施例进行各种修改和变型，倘若这些修改和变型在本发明权利要求及其等同技术的范围之内，则这些修改和变型也在本发明的保护范围之内。Those skilled in the art can make various modifications and variations to the embodiments of the present invention, and if these modifications and variations are within the scope of the claims of the present invention and their equivalent technologies, then these modifications and variations are also within the protection scope of the present invention .
说明书中未详细描述的内容为本领域技术人员公知的现有技术。The content not described in detail in the specification is the prior art known to those skilled in the art.
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| CN201610032995.9ACN105610191B (en) | 2016-01-19 | 2016-01-19 | Reduce the grid-connected Incremental Transmission Loss method of double-fed induction Wind turbines |
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