CN105281342A - Photovoltaic power station reactive distribution method for preferably guaranteeing dynamic reactive margin - Google Patents

Photovoltaic power station reactive distribution method for preferably guaranteeing dynamic reactive margin Download PDF

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CN105281342A
CN105281342A CN201510700286.9A CN201510700286A CN105281342A CN 105281342 A CN105281342 A CN 105281342A CN 201510700286 A CN201510700286 A CN 201510700286A CN 105281342 A CN105281342 A CN 105281342A
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idle
dynamic reactive
compensation device
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CN105281342B (en
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顾志东
黄良毅
王岗红
胡微
汤磊
李聪
谢磊
何礼鹏
王鹏
孙浩
王彬
张仕鹏
陈超
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HAINAN STATE GRID Co Ltd
China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Beijing King Star Hi Tech System Control Co Ltd
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HAINAN STATE GRID Co Ltd
China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
Beijing King Star Hi Tech System Control Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

The invention relates to a photovoltaic power station reactive distribution method for preferably guaranteeing dynamic reactive margin, and belongs to the technical field of voltage reactive automatic regulation in a photovoltaic power station. The method comprises the following steps: acquiring a target voltage value and a current voltage value of a grid-connected point, a reactive current value of a grid-connected inverter and a reactive current value of a dynamic reactive compensating device; determining reactive adjusting amount according to the voltage target value and the current value; determining whether preferably adjusting the dynamic reactive compensating device or preferably adjusting the grid-connected inverter according to the reactive adjusting amount and the reactive direction of the dynamic reactive compensating device, and computing reactive output values of the dynamic reactive compensating device and the grid-connected inverter; finally modifying the reactive output value according to the capacity of each of the dynamic reactive compensating device and the grid-connected inverter. Through the adoption of the method disclosed by the invention, the photovoltaic power station is capable of preferably guaranteeing that the dynamic reactive compensating device is in the maximum reactive regulation margin when the voltage is adjusted, the security and the reliability in the running of the power station are improved; the reactive loop current can be immediately reduced when the reactive output directions of the grid-connected inverter and the dynamic reactive compensating device are opposite, the economy in the running of the power station is improved.

Description

The idle distribution method of photo-voltaic power generation station of preferential guarantee dynamic reactive nargin
Technical field
The invention belongs to photo-voltaic power generation station voltage power-less automatic adjustment technology field, particularly a kind of idle distribution method of photo-voltaic power generation station of preferential guarantee dynamic reactive nargin.
Background technology
GB GB/T19964-2012 " photo-voltaic power generation station access power system technology specifies " regulation: the reactive power source of photo-voltaic power generation station comprises photovoltaic combining inverter and photo-voltaic power generation station reactive power compensator.Photo-voltaic power generation station will make full use of reactive capability and the regulating power thereof of combining inverter; When the reactive capability of inverter can not meet system voltage adjustment needs, should concentrate at photo-voltaic power generation station the reactive power compensator installing suitable capacity additional, install dynamic reactive compensation device (SVG) if desired additional.
This GB also specifies, stand in its idle output area by the photovoltaic generation of 10kV ~ 35kV electric pressure access electrical network, should possess according to the idle output of photo-voltaic power generation station grid-connected point voltage Level tune, participate in the ability that line voltage regulates, its regulative mode and the parameter such as reference voltage, voltage permanent speed regulation should by dispatching of power netwoks mechanism sets.Should reactive voltage control system be configured by the photo-voltaic power generation station of 110 (66) kV and above access electrical network, possess reactive power and regulate and voltage control capability.According to the instruction of dispatching of power netwoks mechanism, photo-voltaic power generation station regulates it to send the reactive power of (or absorption) automatically, and realize the control to grid-connected point voltage, its governing speed and control precision should meet the requirement that power system voltage regulates.
This GB also specifies, the voltage control target of photo-voltaic power generation station is: when public electric wire net voltage is in normal range (NR), the grid-connected point voltage of photo-voltaic power generation station should be able to be controlled in 97% ~ 107% scope of nominal voltage by the photo-voltaic power generation station of 110 (66) kV electric pressure access electrical networks, the grid-connected point voltage of photo-voltaic power generation station should be able to be controlled in 100% ~ 110% scope of nominal voltage by the photo-voltaic power generation station of 220kV and above access electrical network.
This GB also specifies, when electric power system be short-circuited fault cause Voltage Drop time, from the moment that grid-connected point voltage falls appearance, the response time of dynamic reactive electric current is not more than 30ms.When grid-connected point voltage be in nominal voltage 20% ~ 90% interval in time, voltage resume should be able to be supported by injecting reactive current.
The idle operating point of dynamic reactive compensation device the best is 0MVar, now sending, the Reactive-power control nargin absorbed in idle both direction is maximum.Like this once Voltage Drop dynamic reactive compensation device can increase that it sends idle to improve voltage, what also can increase when overtension that it absorbs is idle to reduce voltage.
When photo-voltaic power generation station carries out without the distribution of work, according to the requirement of aforementioned GB, generally first can make full use of reactive capability and the regulating power thereof of combining inverter, when the reactive capability of inverter can not meet system voltage adjustment needs, then regulate the idle output of dynamic reactive compensation device.But this distribution method, when the situation such as the idle outbound course of combining inverter and dynamic reactive compensation device is contrary, can not ensure that dynamic compensating device is preferentially in maximum Reactive-power control nargin.
Summary of the invention
The object of the invention is the weak point for overcoming prior art, a kind of idle distribution method of photo-voltaic power generation station of preferential guarantee dynamic reactive nargin is proposed, the inventive method photo-voltaic power generation station can preferentially be ensured dynamic reactive compensation device is in maximum Reactive-power control nargin, improve photo-voltaic power generation station run safety and reliability; Reactive circular power flow can be reduced in time when the idle outbound course of combining inverter and dynamic reactive compensation device is contrary, improve the economy that photo-voltaic power generation station runs.
The idle distribution method of photo-voltaic power generation station of a kind of preferential guarantee dynamic reactive nargin that the present invention proposes, it is characterized in that, the method comprises the following steps:
1) photo-voltaic power generation station busbar voltage qualified bandwidth in site is designated as U zone, voltage-regulation dead band is designated as U deadband; Dynamic reactive compensation device capacity is designated as Q svg_capacity; Combining inverter is idle, and variable capacity is designated as Q gen_capacity; Combining inverter and the sensitivity of dynamic reactive compensation device Reactive-power control to grid-connected point voltage are designated as S poc;
2) when regulating cycle arrives (regulating cycle is 5 ~ 30 seconds), obtain voltage control desired value from scheduling and be designated as U target; Gather also site busbar voltage and be designated as U poc; The current idle output valve gathering combining inverter and dynamic reactive compensation device is designated as Q respectively genand Q svg;
3) voltage qualified bandwidth sum voltage-regulation dead band is considered, by voltage target U targetbe modified to bus voltage upper limit value and lower limit, be designated as U respectively poc_upand U poc_down:
U poc_up＝U target+U zone/2-U deadband，
U poc_down＝U target-U zone/2+U deadband；
4) and if site busbar voltage U poc> bus voltage upper limit value U poc_up, then by lowering the idle target realizing step-down, total idle downward amount Q downfor:
Q down＝(U poc-U poc_up)/S poc；
If 4-1) the current idle Q of dynamic reactive compensation device svg> 0, then preferentially lower the idle output of dynamic reactive compensation device, make voltage qualified, reduce the Reactive Power Margin of dynamic reactive compensation device simultaneously:
If Q svg>=Q down, then the idle output of dynamic reactive compensation device is only lowered, the idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=Q svg-Q down, go to step 7);
If Q svg< Q down, then not only lower the idle of dynamic reactive compensation device and export 0 to, also will lower the idle output of combining inverter simultaneously; The idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=0; The idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen-(Q down-Q svg), go to step 7);
If 4-2) the current idle Q of dynamic reactive compensation device svg≤ 0, then first lower the idle output of combining inverter, the idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen-Q down;
If Q gen_set< (-1) * Q gen_capacity, then Q is revised gen_setfor Q gen_set=(-1) * Q gen_capacity, lower the idle output of dynamic reactive compensation device, the idle output set point Q of dynamic reactive compensation device simultaneously svg_setfor:
Q svg_set＝Q svg-(Q down-(Q gen-Q gen_set))；
Go to step 7);
5) and if site busbar voltage U poc< busbar voltage lower limit U poc_down, then by raising the idle target realizing boosting, total idle rise amount Q upfor:
Q up＝(U poc_down-U poc)/S poc；
If 5-1) the current idle Q of dynamic reactive compensation device svg< 0, then preferentially raise the idle output of dynamic reactive compensation device, voltage can be made so qualified, reduce the Reactive Power Margin of dynamic reactive compensation device simultaneously:
If | Q svg|>=Q up, then the idle output of dynamic reactive compensation device is only raised, the idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=Q svg+ Q up, go to step 7);
If | Q svg| < Q up, then not only raise the idle of dynamic reactive compensation device and export 0 to, also will raise the idle output of combining inverter simultaneously; The idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=0; The idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen+ (Q up+ Q svg), go to step 7);
If 5-2) the current idle Q of dynamic reactive compensation device svg>=0, then first raise the idle output of combining inverter, the idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen+ Q up;
If Q gen_set> Q gen_capacity, then Q is revised gen_setfor Q gen_set=Q gen_capacity, raise the idle output of dynamic reactive compensation device, the idle output set point Q of dynamic reactive compensation device simultaneously svg_setfor:
Q svg_set＝Q svg+(Q up-(Q gen_set-Q gen))；
Go to step 7);
6) if also site busbar voltage between higher limit and lower limit, then goes to step 8), show that voltage is qualified, do not need to carry out Reactive-power control;
7) according to its idle set point of cubage correction of combining inverter and dynamic reactive compensation device:
If Q svg_set< (-1) * Q svg_capacity, then Q is revised svg_setfor Q svg_set=(-1) * Q svg_capacity;
If Q svg_set> Q svg_capacity, then Q is revised svg_setfor Q svg_set=Q svg_capacity;
If Q gen_set< (-1) * Q gen_capacity, then Q is revised gen_setfor Q gen_set=(-1) * Q gen_capacity;
If Q gen_set> Q gen_capacity, then Q is revised gen_setfor Q gen_set=Q gen_capacity;
8) wait for next regulating cycle, return step 2).
Feature of the present invention and beneficial effect are:
The present invention segments the condition of photo-voltaic power generation station without the distribution of work further on Standard basis, preferentially can ensure that dynamic reactive compensation device is in maximum Reactive-power control nargin while the grid-connected point voltage of adjustment is qualified, improves the safety and reliability that photo-voltaic power generation station runs.Reactive circular power flow can also be reduced in time when the idle outbound course of combining inverter and dynamic reactive compensation device is contrary, improve the economy that photo-voltaic power generation station runs.
Embodiment
Below in conjunction with a specific embodiment, describe the idle distribution method of photo-voltaic power generation station of preferential guarantee dynamic reactive nargin of the present invention in detail.
The idle distribution method of photo-voltaic power generation station of a kind of preferential guarantee dynamic reactive nargin that the present invention proposes, it is characterized in that, the method comprises the following steps:
1) photo-voltaic power generation station busbar voltage qualified bandwidth in site is designated as U zone, voltage-regulation dead band is designated as U deadband; Dynamic reactive compensation device capacity is designated as Q svg_capacity; Combining inverter is idle, and variable capacity is designated as Q gen_capacity; Combining inverter and the sensitivity of dynamic reactive compensation device Reactive-power control to grid-connected point voltage are designated as S poc;
2) when regulating cycle arrives (regulating cycle is 5 ~ 30 seconds), obtain voltage control desired value from scheduling and be designated as U target; Gather also site busbar voltage and be designated as U poc; The current idle output valve gathering combining inverter and dynamic reactive compensation device is designated as Q respectively genand Q svg;
3) voltage qualified bandwidth sum voltage-regulation dead band is considered, by voltage target U targetbe modified to bus voltage upper limit value and lower limit, be designated as U respectively poc_upand U poc_down:
U poc_up＝U target+U zone/2-U deadband，
U poc_down＝U target-U zone/2+U deadband；
4) and if site busbar voltage U poc> bus voltage upper limit value U poc_up, then by lowering the idle target realizing step-down, total idle downward amount Q downfor:
Q down＝(U poc-U poc_up)/S poc；
If 4-1) the current idle Q of dynamic reactive compensation device svg> 0, then preferentially lower the idle output of dynamic reactive compensation device, make voltage qualified, reduce the Reactive Power Margin of dynamic reactive compensation device simultaneously:
If Q svg>=Q down, then the idle output of dynamic reactive compensation device is only lowered, the idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=Q svg-Q down, go to step 7);
If Q svg< Q down, then not only lower the idle of dynamic reactive compensation device and export 0 to, also will lower the idle output of combining inverter simultaneously; The idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=0; The idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen-(Q down-Q svg), go to step 7);
If 4-2) the current idle Q of dynamic reactive compensation device svg≤ 0, then first lower the idle output of combining inverter, the idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen-Q down;
If Q gen_set< (-1) * Q gen_capacity, then Q is revised gen_setfor Q gen_set=(-1) * Q gen_capacity, lower the idle output of dynamic reactive compensation device, the idle output set point Q of dynamic reactive compensation device simultaneously svg_setfor:
Q svg_set＝Q svg-(Q down-(Q gen-Q gen_set))；
Go to step 7);
5) and if site busbar voltage U poc< busbar voltage lower limit U poc_down, then by raising the idle target realizing boosting, total idle rise amount Q upfor:
Q up＝(U poc_down-U poc)/S poc；
If 5-1) the current idle Q of dynamic reactive compensation device svg< 0, then preferentially raise the idle output of dynamic reactive compensation device, voltage can be made so qualified, reduce the Reactive Power Margin of dynamic reactive compensation device simultaneously:
If | Q svg|>=Q up, then the idle output of dynamic reactive compensation device is only raised, the idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=Q svg+ Q up, go to step 7);
If | Q svg| < Q up, then not only raise the idle of dynamic reactive compensation device and export 0 to, also will raise the idle output of combining inverter simultaneously; The idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=0; The idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen+ (Q up+ Q svg), go to step 7);
If 5-2) the current idle Q of dynamic reactive compensation device svg>=0, then first raise the idle output of combining inverter, the idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen+ Q up;
If Q gen_set> Q gen_capacity, then Q is revised gen_setfor Q gen_set=Q gen_capacity, raise the idle output of dynamic reactive compensation device, the idle output set point Q of dynamic reactive compensation device simultaneously svg_setfor:
Q svg_set＝Q svg+(Q up-(Q gen_set-Q gen))；
Go to step 7);
6) if also site busbar voltage between higher limit and lower limit, then goes to step 8), show that voltage is qualified, do not need to carry out Reactive-power control;
7) according to its idle set point of cubage correction of combining inverter and dynamic reactive compensation device:
If Q svg_set< (-1) * Q svg_capacity, then Q is revised svg_setfor Q svg_set=(-1) * Q svg_capacity;
If Q svg_set> Q svg_capacity, then Q is revised svg_setfor Q svg_set=Q svg_capacity;
If Q gen_set< (-1) * Q gen_capacity, then Q is revised gen_setfor Q gen_set=(-1) * Q gen_capacity;
If Q gen_set> Q gen_capacity, then Q is revised gen_setfor Q gen_set=Q gen_capacity;
8) wait for next regulating cycle, return step 2).
The photo-voltaic power generation station installed capacity of the present embodiment is 44MW (80*2 platform 0.275MW photovoltaic array), high voltage bus is 110kV, under 35kV low-voltage bus bar, dynamic reactive compensation device is installed, capacity is 20MVar, have employed the idle distribution method of photo-voltaic power generation station of the preferential guarantee dynamic reactive nargin that the present invention proposes.Regulating cycle is 30 seconds, the qualified bandwidth of voltage is 1kV, voltage-regulation dead band is 0.1kV, the Reactive-power control step-length of dynamic reactive compensation device and photovoltaic combining inverter is 2MVar, dynamic reactive compensation device and photovoltaic combining inverter Reactive-power control are 0.1kV/MVar to the sensitivity of grid-connected point voltage, and photovoltaic combining inverter is idle, and variable capacity is ± 13.2MVar.Concrete adjustment process comprises the following steps:
1-1) (during 21 days 11 August in 2015 03 point 0 second) obtain and site busbar voltage control objectives value 114.5kV from scheduling; Collection dynamic reactive compensation device and the current of photovoltaic combining inverter are-1.2MVar and 3.6MVar without work value; Gather and site busbar voltage 113.6kV;
1-2) consider voltage qualified bandwidth sum voltage-regulation dead band, voltage target is modified to bus voltage upper limit value 114.9kV (114.5+1/2-0.1=114.9), lower limit 114.1kV (114.5-1/2+0.1=114.1);
1-3) and site busbar voltage 113.6kV < lower limit 114.1kV, voltage is defective, and site busbar voltage is lower than lower limit, then need liter idle, idle rise amount is 5MVar ((114.1-113.6)/0.1=5MVar);
1-4) current idle-1.2 < 0 of dynamic reactive compensation device, then preferentially raise the idle output of dynamic reactive compensation device; Set point that dynamic reactive compensation device is idle is 0MVar;
After only regulating dynamic reactive compensation device, idle ascending amount |-1.2| < is idle rise amount 5MVar, the idle output simultaneously need raising combining inverter is 7.4MVar (3.6+5-|-1.2|=7.4); But the Reactive-power control amount 3.8MVar (5-|-1.2|=3.8) of combining inverter is greater than its Reactive-power control step-length 2MVar, therefore idle rise amount is modified to 2MVar, idle set point correct is 5.6MVar (3.6+2=5.6), be less than the maximum variable capacity 13.2MVar of combining inverter, idle set point 5.6MVar can be exported;
2-1) (during 21 days 11 August in 2015 03 point 30 seconds) obtain and site busbar voltage control objectives value 114.5kV from scheduling; Collection dynamic reactive compensation device and the current of photovoltaic combining inverter are 0.1MVar and 5.7MVar without work value; Gather and site busbar voltage 113.9kV;
2-2) consider voltage qualified bandwidth sum voltage-regulation dead band, voltage target is modified to bus voltage upper limit value 114.9kV (114.5+1/2-0.1=114.9), lower limit 114.1kV (114.5-1/2+0.1=114.1);
2-3) and site busbar voltage 113.9kV < lower limit 114.1kV, voltage is defective, and site busbar voltage is lower than lower limit, then need liter idle, idle rise amount is 2MVar ((114.1-113.9)/0.1=2MVar);
2-4) dynamic reactive compensation device current idle 0.1 >=0, then first raise the idle output of combining inverter; Set point that combining inverter is idle is 7.7MVar (5.7+2=7.7); Be less than the maximum variable capacity 13.2MVar of combining inverter, idle set point 7.7MVar can be exported;
3-1) (during 21 days 11 August in 2015 04 point 0 second) obtain and site busbar voltage control objectives value 114.5kV from scheduling; Collection dynamic reactive compensation device and the current of photovoltaic combining inverter are 0.1MVar and 7.8MVar without work value; Gather and site busbar voltage 114.1kV;
3-2) consider voltage qualified bandwidth sum voltage-regulation dead band, voltage target is modified to bus voltage upper limit value 114.9kV (114.5+1/2-0.1=114.9), lower limit 114.1kV (114.5-1/2+0.1=114.1);
3-3) and site busbar voltage 114.1kV=lower limit 114.1kV, voltage is qualified, does not need adjustment idle, waits for next control cycle;
4-1) (during 21 days 13 August in 2015 11 points 0 second) obtain and site busbar voltage control objectives value 114.0kV from scheduling; Collection dynamic reactive compensation device and the current of photovoltaic combining inverter are 0.3MVar and 8.1MVar without work value; Gather and site busbar voltage 114.5kV;
4-2) consider voltage qualified bandwidth sum voltage-regulation dead band, voltage target is modified to bus voltage upper limit value 114.4kV (114.0+1/2-0.1=114.4), lower limit 113.6kV (114.0-1/2+0.1=113.6);
4-3) and site busbar voltage 114.5kV > higher limit 114.4kV, voltage is defective, and site busbar voltage is higher than higher limit, then need to fall idle, idle downward amount is 1MVar ((114.5-114.4)/0.1=1MVar);
4-4) current idle 0.3 > 0 of dynamic reactive compensation device, then preferentially lower the idle output of dynamic reactive compensation device; Set point that dynamic reactive compensation device is idle is 0MVar;
After only regulating dynamic reactive compensation device, idle slippage 0.3MVar < is idle downward amount 1MVar, the idle output simultaneously need lowering combining inverter is 7.4MVar (8.1-1+0.3=7.4), and be less than the maximum variable capacity 13.2MVar of combining inverter, idle set point 7.4MVar can be exported;
5-1) (during 21 days 13 August in 2015 11 points 30 seconds) obtain and site busbar voltage control objectives value 114.0kV from scheduling; Collection dynamic reactive compensation device and the current of photovoltaic combining inverter are 0MVar and 7.4MVar without work value; Gather and site busbar voltage 114.4kV;
5-2) consider voltage qualified bandwidth sum voltage-regulation dead band, voltage target is modified to bus voltage upper limit value 114.4kV (114.0+1/2-0.1=114.4), lower limit 113.6kV (114.0-1/2+0.1=113.6);
5-3) and site busbar voltage 114.4kV=higher limit 114.4kV, voltage is qualified, does not need adjustment idle, waits for next control cycle;
As can be seen from above-described embodiment, after have employed the idle distribution method of photo-voltaic power generation station of the preferential guarantee dynamic reactive nargin that the present invention proposes, elimination voltage is underproof while, the Reactive Power Margin of dynamic reactive compensation device can be increased, the idle output of previous typical case dynamic reactive compensation device is adjusted to 0.1MVar from-1.2MVar, and the idle output of a rear typical case dynamic reactive compensation device is adjusted to 0MVar from 0.3MVar.The problem that the idle outbound course of dynamic reactive compensation device and combining inverter is contrary is also eliminated in previous typical case, the idle output adjusting front dynamic reactive compensation device and combining inverter is respectively-1.2MVar and 3.6MVar, and (polarity is contrary, mean in electrical network that having circulation exists), (polarity is identical to be respectively 0.1MVar with 7.8MVar after adjustment, mean in electrical network there is no circulation, comparatively compare grid loss before adjustment and decline).

Claims (1)

1. the preferential idle distribution method of photo-voltaic power generation station ensureing dynamic reactive nargin, it is characterized in that, the method comprises the following steps:
1) photo-voltaic power generation station busbar voltage qualified bandwidth in site is designated as U zone, voltage-regulation dead band is designated as U deadband; Dynamic reactive compensation device capacity is designated as Q svg_capacity; Combining inverter is idle, and variable capacity is designated as Q gen_capacity; Combining inverter and the sensitivity of dynamic reactive compensation device Reactive-power control to grid-connected point voltage are designated as S poc;
2) when regulating cycle arrives (regulating cycle is 5 ~ 30 seconds), obtain voltage control desired value from scheduling and be designated as U target; Gather also site busbar voltage and be designated as U poc; The current idle output valve gathering combining inverter and dynamic reactive compensation device is designated as Q respectively genand Q svg;
3) voltage qualified bandwidth sum voltage-regulation dead band is considered, by voltage target U targetbe modified to bus voltage upper limit value and lower limit, be designated as U respectively poc_upand U poc_down:
U poc_up＝U target+U zone/2-U deadband，
U poc_down＝U target-U zone/2+U deadband；
4) and if site busbar voltage U poc> bus voltage upper limit value U poc_up, then by lowering the idle target realizing step-down, total idle downward amount Q downfor:
Q down＝(U poc-U poc_up)/S poc；
If 4-1) the current idle Q of dynamic reactive compensation device svg> 0, then preferentially lower the idle output of dynamic reactive compensation device, make voltage qualified, reduce the Reactive Power Margin of dynamic reactive compensation device simultaneously:
If Q svg>=Q down, then the idle output of dynamic reactive compensation device is only lowered, the idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=Q svg-Q down, go to step 7);
If Q svg< Q down, then not only lower the idle of dynamic reactive compensation device and export 0 to, also will lower the idle output of combining inverter simultaneously; The idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=0; The idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen-(Q down-Q svg), go to step 7);
If 4-2) the current idle Q of dynamic reactive compensation device svg≤ 0, then first lower the idle output of combining inverter, the idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen-Q down;
If Q gen_set< (-1) * Q gen_capacity, then Q is revised gen_setfor Q gen_set=(-1) * Q gen_capacity, lower the idle output of dynamic reactive compensation device, the idle output set point Q of dynamic reactive compensation device simultaneously svg_setfor:
Q svg_set＝Q svg-(Q down-(Q gen-Q gen_set))；
Go to step 7);
5) and if site busbar voltage U poc< busbar voltage lower limit U poc_down, then by raising the idle target realizing boosting, total idle rise amount Q upfor:
Q up＝(U poc_down-U poc)/S poc；
If 5-1) the current idle Q of dynamic reactive compensation device svg< 0, then preferentially raise the idle output of dynamic reactive compensation device, voltage can be made so qualified, reduce the Reactive Power Margin of dynamic reactive compensation device simultaneously:
If | Q svg|>=Q up, then the idle output of dynamic reactive compensation device is only raised, the idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=Q svg+ Q up, go to step 7);
If | Q svg| < Q up, then not only raise the idle of dynamic reactive compensation device and export 0 to, also will raise the idle output of combining inverter simultaneously; The idle output set point Q of dynamic reactive compensation device svg_setfor: Q svg_set=0; The idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen+ (Q up+ Q svg), go to step 7);
If 5-2) the current idle Q of dynamic reactive compensation device svg>=0, then first raise the idle output of combining inverter, the idle output set point Q of combining inverter gen_setfor: Q gen_set=Q gen+ Q up;
If Q gen_set> Q gen_capacity, then Q is revised gen_setfor Q gen_set=Q gen_capacity, raise the idle output of dynamic reactive compensation device, the idle output set point Q of dynamic reactive compensation device simultaneously svg_setfor:
Q svg_set＝Q svg+(Q up-(Q gen_set-Q gen))；
Go to step 7);
6) if also site busbar voltage between higher limit and lower limit, then goes to step 8), show that voltage is qualified, do not need to carry out Reactive-power control;
7) according to its idle set point of cubage correction of combining inverter and dynamic reactive compensation device:
If Q svg_set< (-1) * Q svg_capacity, then Q is revised svg_setfor Q svg_set=(-1) * Q svg_capacity;
If Q svg_set> Q svg_capacity, then Q is revised svg_setfor Q svg_set=Q svg_capacity;
If Q gen_set< (-1) * Q gen_capacity, then Q is revised gen_setfor Q gen_set=(-1) * Q gen_capacity;
If Q gen_set> Q gen_capacity, then Q is revised gen_setfor Q gen_set=Q gen_capacity;
8) wait for next regulating cycle, return step 2).
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