CN104333008A - Reactive voltage control method for improving voltage qualified rate of wind power plant - Google Patents
Reactive voltage control method for improving voltage qualified rate of wind power plant Download PDFInfo
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- CN104333008A CN104333008A CN201410632801.XA CN201410632801A CN104333008A CN 104333008 A CN104333008 A CN 104333008A CN 201410632801 A CN201410632801 A CN 201410632801A CN 104333008 A CN104333008 A CN 104333008A
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- voltage
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- reactive power
- blower fan
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a reactive voltage control method for improving voltage qualified rate of a wind power plant. The reactive voltage control method for improving the voltage qualified rate of the wind power plant includes steps that S1, acquiring the real-time data and running state information of a fan and a reactive compensation device in the wind power plant and the real-time electrical quantity information of a booster station; S2, calculating the reactive voltage sensitivity of the fan end in the wind power plant, the reactive voltage sensitivity of a reactive compensation device grid-connected point and the reactive voltage sensitivity of a booster station grid-connected point of the wind power plant; S3, calculating the control error of the fan and the reactive compensation device according to an executed reactive voltage control target and the corresponding actual reactive value; S4, analyzing and calculating the reactive voltage control targets of the fan and the reactive compensation device; S5, compensating the reactive voltage control targets; S6, obtaining safety control targets; S7; outputting the safety control targets to control units of the fan and reactive compensation device to control targets; S8, returning to the step S3. The reactive voltage control method for improving the voltage qualified rate of the wind power plant is good for improving the voltage regulation qualified rate of an automatic voltage control system of the wind power plant.
Description
Technical field
The present invention relates to technical field of wind power, particularly relate to a kind of reactive voltage control method improving wind energy turbine set rate of qualified voltage.
Background technology
Because wind power output has randomness, intermittence and fluctuation, therefore large-scale wind-electricity integration will produce certain adverse effect to the safe and stable operation of electrical network.Along with the progressively increase with wind-electricity integration proportion that increases rapidly of installed capacity of wind-driven power, for ensureing that electrical network is to the receiving of wind-powered electricity generation, the coordinated development promoting wind-powered electricity generation and electrical network, by be connected with electrical network newly-built of 110kV and above circuit or extend wind energy turbine set in Grid, need to carry out voltage and reactive power automatic control to wind energy turbine set, object improves rate of qualified voltage and the reduction network loss of the whole network, promote the safety operation level of electrical network, and electrical network is to the receiving ability of wind-powered electricity generation.
The also site busbar voltage target instruction target word that existing wind energy turbine set AVC (automatic voltage control system) substation is issued by dispatch data net reception main website, AVC substation system is preferential according to blower fan, SVG/C takes second place, main transformer tap adjustment order in addition, the system side electric quantity information forwarded in conjunction with booster stations supervisory control system and each electric quantity information of whole audience blower fan of fan monitoring system forwards, according to certain idle allocation strategy, calculate blower fan and the idle of SVG/C is exerted oneself, and main transformer tap remote regulating behavior, and then issue control objectives and control command regulates.Owing to not considering dynamic adjustable reactive source blower fan, Static Var Compensator (the Static Var Compensator of wind energy turbine set, and static reacance generator (Static Var Generator SVC), SVG) dynamic stability and degree of regulation problem, the virtual voltage causing current wind energy turbine set AVC substation regulates qualification rate generally on the low side.
Summary of the invention
Based on the technical problem that background technology exists, the present invention proposes a kind of reactive voltage control method improving wind energy turbine set rate of qualified voltage.
A kind of reactive voltage control method improving wind energy turbine set rate of qualified voltage that the present invention proposes, in wind energy turbine set voltage and reactive power automatic control process, result is controlled by dynamic tracking target, error compensation process is carried out to the voltage & var control target of blower fan and reactive power compensator, specifically comprises the following steps:
S1, the real time data obtaining wind energy turbine set inner blower and reactive power compensator and running state information and the real-time electric quantity information of booster stations, electric quantity information comprises booster stations high and low pressure side busbar voltage, main transformer high and low pressure side active power and reactive power;
The voltage power-less sensitivity of S2, calculated field inner blower machine end, reactive power compensator the voltage power-less sensitivity of site the voltage power-less sensitivity of site;
The actual departure calculating blower fan and reactive power compensator without work value of the voltage & var control target that S3, basis have performed and correspondence;
The voltage & var control target of S4, analytical calculation blower fan and reactive power compensator;
S5, according to departure, process is compensated to voltage & var control target;
S6, Prediction Control result the idle control objectives of correction voltage, obtain security control object;
S7, control unit security control object being exported to blower fan and reactive power compensator carry out target control;
S8, epicycle control to terminate, and return step S3 and carry out next round analytical calculation and target control.
Preferably, the specific implementation of step S3 is: the voltage & var control target that dynamically recording issued blower fan and reactive power compensator, and before the idle control objectives of next round calculating voltage, obtain the actual in work value of blower fan and reactive power compensator, according to actual without work value and the voltage & var control target calculating blower fan of correspondence and the departure of reactive power compensator.
Preferably, the specific implementation of step S4 is: according to the voltage difference between control bus target voltage and current busbar voltage, judges whether voltage & var control target reaches, if reached voltage & var control target, then terminates regulable control; If do not reach voltage & var control target, then pass through and the voltage power-less sensitivity of site, calculate whole audience voltage & var control target, the more idle coordinated allocation strategy by presetting, Distribution Calculation is carried out to the control objectives of blower fan and the control objectives of reactive power compensator.
Preferably, the specific implementation of step S6 is: by the voltage power-less sensitivity of blower fan machine end, reactive power compensator the voltage power-less sensitivity of site, state estimations is carried out to the control result of blower fan and reactive power compensator, and correct according to the control objectives of estimation results to blower fan and reactive power compensator, obtain security control object.
Preferably, reactive power compensator is SVC or SVG.
The present invention, by dynamically following the tracks of and calculate in real time the departure of blower fan and reactive power compensator, introduces departure and compensates and state estimations technology in voltage power-less adjustment process.By the error compensation process to blower fan and reactive power compensator voltage & var control target, solve the problem that control effects that blower fan and the departure of reactive power compensator own cause is undesirable, steady-state error between the output of wind energy turbine set reactive source and control objectives is progressively reduced, until reach control objectives, be conducive to improving voltage-regulation qualification rate.Carry out Correction and Control target by state estimation, guarantee the safety and stability controlled further, promote grid-connected point voltage safety operation level.
Accompanying drawing explanation
Fig. 1 is a kind of reactive voltage control method flow chart improving wind energy turbine set rate of qualified voltage that the present invention proposes.
Embodiment
With reference to Fig. 1, a kind of reactive voltage control method improving wind energy turbine set rate of qualified voltage that the present invention proposes, in wind energy turbine set voltage and reactive power automatic control process, result is controlled by dynamic tracking target, error compensation process is carried out to the voltage & var control target of blower fan and reactive power compensator, solves the problem that control effects that blower fan and the departure of reactive power compensator own cause is undesirable.
This method specifically comprises the following steps:
S1, the real time data obtaining wind energy turbine set inner blower and reactive power compensator and running state information and the real-time electric quantity information of booster stations, electric quantity information comprises booster stations high and low pressure side busbar voltage, main transformer high and low pressure side active power and reactive power.
The voltage power-less sensitivity of S2, calculated field inner blower machine end, reactive power compensator the voltage power-less sensitivity of site the voltage power-less sensitivity of site.
Voltage power-less sensitivity in step S2 carries out calculating on the basis of the measured data of step S1 acquisition, real-time.Reactive power compensator the voltage of site is wind energy turbine set booster stations low-pressure side bus voltage, and the voltage of site is wind energy turbine set booster stations high side bus voltage.
The actual departure calculating blower fan and reactive power compensator without work value of the voltage & var control target that S3, basis have performed and correspondence.
The specific implementation of step S3 is: the voltage & var control target that dynamically recording issued blower fan and reactive power compensator, and before the idle control objectives of next round calculating voltage, obtain the actual in work value of blower fan and reactive power compensator, calculate the departure of blower fan and reactive power compensator according to the actual voltage & var control target issued without work value and correspondence respectively.
The voltage & var control target of S4, analytical calculation blower fan and reactive power compensator.
The specific implementation of step S4 is: according to the voltage difference between control bus target voltage and current busbar voltage, judges whether voltage & var control target reaches, if reached voltage & var control target, then terminates regulable control; If do not reach voltage & var control target, then pass through and the voltage power-less sensitivity of site, calculate whole audience voltage & var control target, the more idle coordinated allocation strategy by presetting, Distribution Calculation is carried out to the control objectives of blower fan and the control objectives of reactive power compensator.
Whole audience voltage & var control realizes mainly through regulating blower fan and reactive power compensator, by the idle coordinated allocation strategy preset, whole audience voltage & var control target is divided into the control objectives of blower fan and the control objectives of reactive power compensator, and control blower fan and reactive power compensator respectively, thus whole audience voltage & var control target can be realized.
S5, according to departure, process is compensated to voltage & var control target.
In step S5, the control objectives of departure to blower fan according to blower fan compensates, and the control objectives of departure to reactive power compensator according to reactive power compensator compensates.
In this method, by the error compensation process of the control objectives to blower fan and reactive power compensator, solve the problem that control effects that blower fan and the departure of reactive power compensator own cause is undesirable, effectively raise wind energy turbine set voltage-regulation qualification rate.
S6, Prediction Control result the idle control objectives of correction voltage, obtain security control object.
The specific implementation of step S6 is: by the voltage power-less sensitivity of blower fan machine end, reactive power compensator the voltage power-less sensitivity of site, state estimations is carried out to the control result of blower fan and reactive power compensator, and correct according to the control objectives of estimation results to blower fan and reactive power compensator, obtain security control object.
In this step, the security control object of acquisition take into account control result, is conducive to promoting grid-connected point voltage safety operation level.
S7, control unit security control object being exported to blower fan and reactive power compensator carry out target control.
In present embodiment, reactive power compensator can adopt SVC (Static Var Compensator, Static Var Compensator) or SVG (Static Var Generator, static reacance generator).
S8, epicycle control to terminate, and return step S3 and carry out next round analytical calculation and target control.
In this step, after the target control completing epicycle voltage power-less, return next round analytical calculation and target control, realize the real-Time Tracking Control to wind farm grid-connected point voltage.
This method, by dynamically following the tracks of and calculate in real time the departure of blower fan and reactive power compensator, is introduced departure and is compensated and state estimations technology in voltage power-less adjustment process.By the error compensation process to blower fan and reactive power compensator voltage & var control target, solve the problem that control effects that blower fan and the departure of reactive power compensator own cause is undesirable, steady-state error between the output of wind energy turbine set reactive source and control objectives is progressively reduced, until reach control objectives.Carry out Correction and Control target by state estimation, guarantee the safety and stability controlled further, promote grid-connected point voltage safety operation level, improve voltage-regulation qualification rate.
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 (5)
1. one kind is improved the reactive voltage control method of wind energy turbine set rate of qualified voltage, it is characterized in that, in wind energy turbine set voltage and reactive power automatic control process, result is controlled by dynamic tracking target, error compensation process is carried out to the voltage & var control target of blower fan and reactive power compensator, specifically comprises the following steps:
S1, the real time data obtaining wind energy turbine set inner blower and reactive power compensator and running state information and the real-time electric quantity information of booster stations, electric quantity information comprises booster stations high and low pressure side busbar voltage, main transformer high and low pressure side active power and reactive power;
The voltage power-less sensitivity of S2, calculated field inner blower machine end, reactive power compensator the voltage power-less sensitivity of site the voltage power-less sensitivity of site;
The actual departure calculating blower fan and reactive power compensator without work value of the voltage & var control target that S3, basis have performed and correspondence;
The voltage & var control target of S4, analytical calculation blower fan and reactive power compensator;
S5, according to departure, process is compensated to voltage & var control target;
S6, Prediction Control result the idle control objectives of correction voltage, obtain security control object;
S7, control unit security control object being exported to blower fan and reactive power compensator carry out target control;
S8, epicycle control to terminate, and return step S3 and carry out next round analytical calculation and target control.
2. the reactive voltage control method improving wind energy turbine set rate of qualified voltage as claimed in claim 1, it is characterized in that, the specific implementation of step S3 is: the voltage & var control target that dynamically recording issued blower fan and reactive power compensator, and before the idle control objectives of next round calculating voltage, obtain the actual in work value of blower fan and reactive power compensator, according to actual without work value and the voltage & var control target calculating blower fan of correspondence and the departure of reactive power compensator.
3. the reactive voltage control method improving wind energy turbine set rate of qualified voltage as claimed in claim 1, it is characterized in that, the specific implementation of step S4 is: according to the voltage difference between control bus target voltage and current busbar voltage, judge whether voltage & var control target reaches, if reached voltage & var control target, then terminate regulable control; If do not reach voltage & var control target, then pass through and the voltage power-less sensitivity of site, calculate whole audience voltage & var control target, the more idle coordinated allocation strategy by presetting, Distribution Calculation is carried out to the control objectives of blower fan and the control objectives of reactive power compensator.
4. the reactive voltage control method improving wind energy turbine set rate of qualified voltage as claimed in claim 1, it is characterized in that, the specific implementation of step S6 is: by the voltage power-less sensitivity of blower fan machine end, reactive power compensator the voltage power-less sensitivity of site, state estimations is carried out to the control result of blower fan and reactive power compensator, and correct according to the control objectives of estimation results to blower fan and reactive power compensator, obtain security control object.
5. the reactive voltage control method of the raising wind energy turbine set rate of qualified voltage as described in any one of Claims 1-4, is characterized in that, reactive power compensator is SVC or SVG.
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| CN105048472A (en) * | 2015-07-08 | 2015-11-11 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of photovoltaic power station |
| CN105591391A (en) * | 2015-12-23 | 2016-05-18 | 国家电网公司 | Wind and solar energy storage combined power station reactive voltage control method |
| CN105633974A (en) * | 2016-03-03 | 2016-06-01 | 甘肃省电力公司风电技术中心 | Real-time regional voltage coordination control method |
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| CN105048472A (en) * | 2015-07-08 | 2015-11-11 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of photovoltaic power station |
| CN105591391A (en) * | 2015-12-23 | 2016-05-18 | 国家电网公司 | Wind and solar energy storage combined power station reactive voltage control method |
| CN105591391B (en) * | 2015-12-23 | 2020-03-20 | 国家电网公司 | Reactive voltage control method for wind-solar-storage combined power station |
| CN105633974A (en) * | 2016-03-03 | 2016-06-01 | 甘肃省电力公司风电技术中心 | Real-time regional voltage coordination control method |
| CN105633974B (en) * | 2016-03-03 | 2017-11-24 | 甘肃省电力公司风电技术中心 | A kind of real-time region voltage control method for coordinating |
| CN106602572A (en) * | 2016-12-23 | 2017-04-26 | 安徽立卓智能电网科技有限公司 | Method for computing voltage sensitivity of automatic voltage control system |
| CN106602572B (en) * | 2016-12-23 | 2019-05-17 | 安徽立卓智能电网科技有限公司 | A kind of calculation method of automatic voltage control system voltage sensibility |
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