CN105429181A - Automatic photovoltaic power station active power control method - Google Patents

Abstract

The invention discloses an automatic photovoltaic power station active power control method. The method comprises the following steps: S1, the priority of each inverter in the photovoltaic power station is set; and S2, according to the priority, the inverters are grouped to acquire multiple inverter sets, wherein the inverters with the same priority are induced to one inverter set. According to the active power output general objective P objective issued by a main station and the current active power output value P outlet for the photovoltaic power station, an active power P increment value in need of adjustment is calculated. According to a judgment result of whether the active power P increment value is a positive value or a negative value, a different inverter adjustment mode is adopted. If the active power P increment value is the positive value, the inverter sets are traversed according to the priorities from high to low, and active power of the inverters is adjusted; and if the active power P increment value is the negative value, the inverter sets are traversed according to the priorities from low to high, and active power of the inverters is adjusted.

Description

A kind of photovoltaic plant active power autocontrol method

Technical field

The present invention relates to photovoltaic plant technical field, particularly relate to and the present invention proposes a kind of photovoltaic plant active power autocontrol method.

Background technology

Photovoltaic plant installed capacity at home has in recent years had fulminant growth, and according to " photovoltaic plant access electric power network technique regulation " requirement, photovoltaic plant should have active power regulation ability, and can control the output of its active power according to dispatching of power netwoks departmental instruction.The power adjustments of current photovoltaic plant can be divided into two classes substantially, and a class is manual adjustment, and a class is automatic adjustment.Send instructions to photovoltaic plant under the mode of manual adjustment and scheduling station, then by start and stop inverter manually; Send instructions to the active power controller device of photovoltaic plant under the mode of automatic adjustment and scheduling station, then exerted oneself by the meritorious of each inverter in active power automatic control equipment control photovoltaic plant.

Existing two class active power controller modes all have shortcoming, and manual adjustment mode needs artificial frequent operation, and labour intensity is large, and the response time is long, and cost of labor is high; Automatic regulative mode response is fast, save cost of labor, but the nargin modes such as the general mode that automatically regulates and distributes is, each inverter in photovoltaic plant is equal, the each inverter active distributed is exerted oneself substantially equal, and in fact in photovoltaic plant the economic benefit of each inverter be different, can not ensure that the economic benefit of photovoltaic plant is maximum etc. the method for salary distribution of nargin.

Summary of the invention

Based on the technical problem that background technology exists, the present invention proposes a kind of photovoltaic plant active power autocontrol method.

A kind of photovoltaic plant active power autocontrol method that the present invention proposes, comprises the following steps:

S1, the priority of each inverter in photovoltaic plant is set;

S2, according to priority to inverter carry out grouping obtain multiple inverter set, the inverter that priority is equal is concluded in an inverter set;

S3, the real-time electric quantity information of acquisition booster stations, and calculate the current force value P that gains merit of photovoltaic plant_outlet;

The meritorious general objective P that exerts oneself of S4, acquisition main website dispatching down distributing_target;

S5, calculating photovoltaic plant need the meritorious increment size P regulated_increment=P_target-P_outlet;

S6, will gain merit increment size P_incrementabsolute value and the meritorious adjustment dead band value P of photovoltaic plant_{regulate dead band}contrast;

If S7 | P_increment| >P_{regulate dead band}, then meritorious increment size P is judged_incrementfor on the occasion of or be negative value;

The increment size P if S8 gains merit_incrementfor on the occasion of, then travel through inverter set from high to low according to priority, and regulate inverter to send out meritorious;

The increment size P if S9 gains merit_incrementfor negative value, then travel through inverter from low to high according to priority and combine, and regulate inverter to send out meritorious.

Preferably, step S2 is specially: carry out grouping according to priority to inverter and obtain multiple inverter set, and the inverter that priority is equal concludes one and only in an inverter set.

Preferably, also step S10 is comprised: obtain each inverter real time data and running state information in photovoltaic plant.

Preferably, step S8 is divided into following steps:

S81, according to priority from high to low, the set of traversal inverter, as the controlled and current meritorious P of inverter_currentbe less than and maximumly send out P meritorious_{can send out}time, gain merit for target regulates this inverter with maximum sending out, the P and real-time accumulated rise is gained merit_raise, P_raise=P_{can send out}-P_current;

S82, as the meritorious aggregate-value ∑ P of rise_raisebe more than or equal to meritorious increment size P_incrementtime, stop regulating.

Preferably, step S8 also comprises S80 step by step: calculate it according to each inverter real time data and running state information and maximumly send out P meritorious_{can send out}with current meritorious P_current.

Preferably, step S9 is divided into following steps:

S91, according to priority from low to high, the set of traversal inverter, as the controlled and current meritorious P of inverter_currentbe greater than most I and send out P meritorious_minimumtime, send out with most I and gain merit for target regulates this inverter, the P and real-time accumulated downward is gained merit_lower, P_lower=P_minimum-P_current;

S92, as the meritorious aggregate-value ∑ P of downward_lowerbe less than or equal to meritorious increment size P_incrementtime, stop regulating.

Preferably, step S9 also comprises S90 step by step: calculate its most I according to each inverter real time data and running state information and send out P meritorious_minimumwith current meritorious P_current.

Photovoltaic plant active power autocontrol method provided by the invention, first can arrange the priority of each inverter in photovoltaic plant, then according to the meritorious general objective P that exerts oneself that main website issues according to economic benefit or other principles_targetgain merit force value P current with photovoltaic plant_outletcalculate the meritorious increment size P needing to regulate_increment.And according to meritorious increment size P_incrementfor on the occasion of or be the judged result of negative value, adopt different inverter regulative modes.If meritorious increment size P_incrementfor on the occasion of, then travel through inverter set from high to low according to priority, and regulate inverter to send out meritorious; If meritorious increment size P_incrementfor negative value, then travel through inverter from low to high according to priority and combine, and regulate inverter to send out meritorious.

In the present invention, by the different situations according to meritorious increment size P increment, adopt different photovoltaic plant regulative modes, allow the high inverter of priority preferentially generate electricity when load up, first turn down priority low inverter active when load down, the economic benefit of photovoltaic plant can be made to reach optimum.

In the present invention, by inverter equal for priority is concluded in same inverter set, be conducive to the speed improving traversal inverter, thus improve the adjustment efficiency of photovoltaic plant.

Accompanying drawing explanation

Fig. 1 is a kind of photovoltaic plant active power autocontrol method flow chart that the present invention proposes.

Embodiment

With reference to Fig. 1, a kind of photovoltaic plant active power autocontrol method that the present invention proposes, comprises the following steps.

S1, the priority of each inverter in photovoltaic plant is set.

Each inverter priority can be arranged as required, such as, according to the economic benefit of inverter each in photovoltaic plant, to ensure that the economic benefit of photovoltaic plant is target to the maximum and carries out priority setting.

S2, carry out grouping obtain multiple inverter set according to priority to inverter, the inverter that priority is equal concludes one and only in an inverter set.

In present embodiment, the inverter equal to priority by inverter set is gathered, and is conducive to improving the follow-up efficiency regulated inverter, thus the efficiency that raising active power controls automatically.

S3, the real-time electric quantity information of acquisition booster stations, and calculate the current force value P that gains merit of photovoltaic plant_outlet.The meritorious general objective P that exerts oneself of S4, acquisition main website dispatching down distributing_target.

S5, calculating photovoltaic plant need the meritorious increment size P regulated_increment=P_target-P_outlet.

S6, will gain merit increment size P_incrementabsolute value and the meritorious adjustment dead band value P of photovoltaic plant_{regulate dead band}contrast.

If S7 | P_increment| >P_{regulate dead band}, then meritorious increment size P is judged further_incrementfor on the occasion of or be negative value.If | P_increment| <P_{regulate dead band}, then illustrate that photovoltaic plant is working properly, does not need to regulate, so can terminate to regulate.

In present embodiment, when | P_increment| >P_{regulate dead band}, regardless of P_incrementfor on the occasion of or be negative value, all need to carry out real power control to photovoltaic plant, especially by the meritorious realization of exerting oneself regulating each inverter, so, this method also comprises step S10: obtain each inverter real time data and running state information in photovoltaic plant, to grasp the real-time status of each inverter.

If meritorious increment size P_incrementfor on the occasion of, then illustrate, need meritorious the exerting oneself of each inverter to heighten.In order to realize higher economic benefit, in present embodiment, according to priority order from high to low, each inverter being regulated, specifically can refer to step S80-S82.

S80: calculate it according to each inverter real time data and running state information and maximumly send out P meritorious_{can send out}with current meritorious P_current.

S81, according to priority from high to low, the set of traversal inverter, as the controlled and current meritorious P of inverter_currentbe less than and maximumly send out P meritorious_{can send out}time, gain merit for target regulates this inverter with maximum sending out, the P and real-time accumulated rise is gained merit_raise, P_raise=P_{can send out}-P_current.

S82, as the meritorious aggregate-value ∑ P of rise_raisebe more than or equal to meritorious increment size P_incrementtime, stop regulating.

In this step, first the highest to priority inverter set regulates, and the rise after the part or all of controlled inverter in inverter set regulates is gained merit P_raisetotal value can meet meritorious increment size P_incrementtime, then stop regulating; The P if the rise after controlled inverters all in current inverter set regulates is gained merit_raisetotal value still do not reach meritorious increment size P_incrementtime, then further the inverter in the inverter set of the low one-level of priority is regulated, until reach meritorious increment size P_increment.

If meritorious increment size P_incrementfor negative value, then illustrate, need meritorious the exerting oneself of each inverter to turn down.In order to realize higher economic benefit, in present embodiment, according to priority order from low to high, each inverter being regulated, specifically can refer to step S90-S92.。

Step S90, to calculate the most I of each inverter according to each inverter real time data and running state information and send out P meritorious_minimumwith current meritorious P_current.

S91, according to priority from low to high, the set of traversal inverter, as the controlled and current meritorious P of inverter_currentbe greater than most I and send out P meritorious_minimumtime, send out with most I and gain merit for target regulates this inverter, the P and real-time accumulated downward is gained merit_lower, P_lower=P_minimum-P_current.

S92, as the meritorious aggregate-value ∑ P of downward_lowerbe less than or equal to meritorious increment size P_incrementtime, stop regulating.

In this step, first regulate the inverter set that priority is minimum, the downward after the part or all of controlled inverter in inverter set regulates is gained merit P_lowertotal value can meet meritorious increment size P_incrementtime, then stop regulating; The P if the downward after controlled inverters all in current inverter set regulates is gained merit_lowertotal value still do not reach meritorious increment size P_incrementtime, then further the inverter in the higher leveled inverter set of priority is regulated, until reach meritorious increment size P_increment.

The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.

Claims (7)

1. a photovoltaic plant active power autocontrol method, is characterized in that, comprises the following steps:

S1, the priority of each inverter in photovoltaic plant is set;

S2, according to priority to inverter carry out grouping obtain multiple inverter set, the inverter that priority is equal is concluded in an inverter set;

S3, the real-time electric quantity information of acquisition booster stations, and calculate the current force value P that gains merit of photovoltaic plant_outlet;

The meritorious general objective P that exerts oneself of S4, acquisition main website dispatching down distributing_target;

S5, calculating photovoltaic plant need the meritorious increment size P regulated_increment=P_target-P_outlet;

S6, will gain merit increment size P_incrementabsolute value and the meritorious adjustment dead band value P of photovoltaic plant_{regulate dead band}contrast;

If S7 | P_increment| >P_{regulate dead band}, then meritorious increment size P is judged_incrementfor on the occasion of or be negative value;

The increment size P if S8 gains merit_incrementfor on the occasion of, then travel through inverter set from high to low according to priority, and regulate inverter to send out meritorious;

The increment size P if S9 gains merit_incrementfor negative value, then travel through inverter from low to high according to priority and combine, and regulate inverter to send out meritorious.

2. photovoltaic plant active power autocontrol method as claimed in claim 1, it is characterized in that, step S2 is specially: carry out grouping according to priority to inverter and obtain multiple inverter set, and the inverter that priority is equal concludes one and only in an inverter set.

3. photovoltaic plant active power autocontrol method as claimed in claim 1, is characterized in that, also comprise step S10: obtain each inverter real time data and running state information in photovoltaic plant.

4. photovoltaic plant active power autocontrol method as claimed in claim 3, it is characterized in that, step S8 is divided into following steps:

S81, according to priority from high to low, the set of traversal inverter, as the controlled and current meritorious P of inverter_currentbe less than and maximumly send out P meritorious_{can send out}time, gain merit for target regulates this inverter with maximum sending out, the P and real-time accumulated rise is gained merit_raise, P_raise=P_{can send out}-P_current;

S82, as the meritorious aggregate-value ∑ P of rise_raisebe more than or equal to meritorious increment size P_incrementtime, stop regulating.

5. photovoltaic plant active power autocontrol method as claimed in claim 4, it is characterized in that, step S8 also comprises S80 step by step: calculate it according to each inverter real time data and running state information and maximumly send out P meritorious_{can send out}with current meritorious P_current.

6. photovoltaic plant active power autocontrol method as claimed in claim 3, it is characterized in that, step S9 is divided into following steps:

S91, according to priority from low to high, the set of traversal inverter, as the controlled and current meritorious P of inverter_currentbe greater than most I and send out P meritorious_minimumtime, send out with most I and gain merit for target regulates this inverter, the P and real-time accumulated downward is gained merit_lower, P_lower=P_minimum-P_current;

S92, as the meritorious aggregate-value ∑ P of downward_lowerbe less than or equal to meritorious increment size P_incrementtime, stop regulating.

7. photovoltaic plant active power autocontrol method as claimed in claim 6, it is characterized in that, step S9 also comprises S90 step by step: calculate its most I according to each inverter real time data and running state information and send out P meritorious_minimumwith current meritorious P_current.