CN104901319A - Photovoltaic power plant AVC control method - Google Patents
Photovoltaic power plant AVC control method Download PDFInfo
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- CN104901319A CN104901319A CN201510242335.9A CN201510242335A CN104901319A CN 104901319 A CN104901319 A CN 104901319A CN 201510242335 A CN201510242335 A CN 201510242335A CN 104901319 A CN104901319 A CN 104901319A
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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
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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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Abstract
The present invention discloses a photovoltaic power plant AVC control method, and the control errors of a calculation inverter and a reactive compensation device are calculated. The control error compensation and state estimation technology are introduced in a voltage reactive adjustment process, and the reactive control is carried out through the mode of gradually reducing the steady-state error between the outputs of photovoltaic power plant reactive power sources and a control target. After a reactive target is received, combined with a current reactive actual value, reactive power sources in a field are coordinated, and the reactive target issued by a main station is rapidly followed to carry out reactive control. According to the method, the reactive power balance of the inverter and the reactive compensation device can be reasonably allocated, under the premise of ensuring the safe and stable operation of photovoltaic power plant equipment, the dynamic continuous adjustment is realized to control grid-connected point voltage, and the requirement of the grid voltage is satisfied.
Description
Technical field
The present invention relates to photovoltaic plant reactive power compensation technology field, particularly relate to photovoltaic plant AVC control method.
Background technology
Solar power generation obtains huge development in recent years under the vigorously supporting of country, due to randomness, the intermittent feature of solar power generation, the difficulty causing operation of power networks to dispatch and complicated, cause very large impact to the safe and stable operation of electrical network, therefore dispatching of power netwoks mechanism is in the urgent need to realizing the real-time monitoring of photovoltaic plant operation.And AVC (automatism voltage control) technology is as the new system of photovoltaic plant, there is vital impact to photovoltaic plant voltage.
The fast development of photovoltaic generation, brings huge challenge to electrical network, and under making electrical network need consider the background of large-scale photovoltaic access electrical network, the power how realizing photovoltaic plant output controls most important.
The stochastic volatility of photovoltaic generation, adds the difficulty that operation of power networks controls, and reduces operation of power networks economy.For one by tens of even up to a hundred inverters with Reactive-power control ability, the key of control that it is idle is how to coordinate the relation between the idle control of photovoltaic plant and inverter control.Because photovoltaic plant unit capacity is relatively little, single inverter Reactive-power control is difficult to realize the support to system voltage, is also difficult to meet relevant regulatory requirements.Therefore, the reactive power of photovoltaic plant regulates problem must involve the combine regulation of numerous inverter group and reactive-load compensation equipment.The how idle output of cooperation control every platform inverter and reactive-load compensation equipment, the idle output of photovoltaic electric station grid connection point is made to meet system loading change, suppress the busbar voltage fluctuation caused by load variations, resist the control point Voltage Drop caused by partial electric grid fault, maintain photovoltaic plant access region Network Voltage Stability problem and receive much concern.
The control program of current main flow is as follows: photovoltaic station AVC system acceptance to main website of control centre issue and site busbar voltage instruction after, AVC substation combines operating condition in setting out in advance to make arrangements, calculate voltage required idle amount up to standard, limited according to inverter, the reactive-load compensation equipments such as SVC or SVG take second place, and reresent and regulate or directly regulate the order of main transformer to control.Each inverter is distributed to by idle at present according to the allocation strategy of each inverter constant power factor, if what inverter sent idlely can not meet regulating and controlling voltage requirement, then more idle instruction is handed down to reactive-load compensation equipment, near instruction photovoltaic plant busbar voltage being maintained assign control centre.
But there is following problem in actual applications in current this scheme: one, according to the allocation strategy of power factor, (the scheduling at different levels accessed at present within an instruction cycle, within general 5 minutes, issue an instruction, within an instruction cycle, solar panel is by illumination intensity effect, and meritorious change is frequent, and at this moment there is output order, to change situation frequently (be generally 15-30s, according to calculate idle increment, single or be progressively handed down to inverter); Two, there is idle output and forbidden in indivedual inverter, or fault can not export idle situation, causes this regulating error.
Generally speaking, the rate of qualified voltage of current photovoltaic plant AVC adjustment is 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 photovoltaic plant AVC control method.
A kind of photovoltaic plant AVC control method that the present invention proposes, the departure of real-time calculating inverter and reactive power compensator, in voltage power-less adjustment process, introduce departure compensate and state estimations technology, carry out idle control by the mode progressively reducing the steady-state error between the output of photovoltaic plant reactive source and control objectives; Specifically comprise the following steps:
S1, the real-time status data obtaining photovoltaic plant inverter and reactive power compensator and running state information and booster stations electric quantity information;
S2, reception busbar voltage control command, obtain Target of Reactive Power; And the voltage power-less sensitivity of photovoltaic DC-to-AC converter in combining station, the voltage power-less sensitivity of reactive power compensator the voltage power-less sensitivity of site, generate idle increment;
S3, calculate controlled inverter quantity and the controlled nargin of inverter, and calculate the controlled nargin of controlled reactive-load compensation equipment;
S4, distribute idle control objectives according to idle increment, generate idle control command according to idle control objectives, and be handed down to controlled inverter and controlled reactive-load compensation equipment;
S5, judge whether Target of Reactive Power reaches;
S51, when Target of Reactive Power reaches, then terminate epicycle control, return S2;
S6, not reach when Target of Reactive Power, then according to idle control objectives and current idle calculated with actual values inverter and reactive-load compensation equipment control deviation, and generate idle correction target value and be handed down to current controlled inverter and current controlled reactive-load compensation equipment;
S7, judge whether Target of Reactive Power reaches, if reached, then terminate epicycle and control, return S2; If do not reached, then return S6.
After the present invention receives Target of Reactive Power, can in conjunction with current idle actual value, coordinate each reactive source in field, follow the Target of Reactive Power that main website issues fast and carry out idle control.The idle torque equilibrium of energy reasonable distribution inverter of the present invention, reactive power compensator, under ensureing the prerequisite of photovoltaic plant device security stable operation, realizes dynamic adjustment continuously and, to control grid-connected point voltage, meets the requirement of line voltage.
Preferably, step S4 specifically comprises the following steps:
S41, controlled to idle increment and inverter nargin total value to be compared;
S42, be less than or equal to the controlled nargin total value of inverter when idle increment, then control inverter release Reactive Power Margin;
S43, when idle increment is greater than the controlled nargin total value of inverter, then control inverter discharges all Reactive Power Margins, then carries out reactive power compensation by reactive-load compensation equipment.
First the present invention makes full use of inverter and carries out reactive power compensation, and when the reactive capability only by inverter can not meet idle increment needs, then regulating and controlling reactive power compensator carries out reactive power compensation.Level is strong, and the division of labor is clear and definite, is conducive to the accuracy improving Reactive-power control.
Preferably, step S42 is specially: select the multiple stage inverter in current controlled inverter group, discharged all Reactive Power Margins by the inverter group selected; If reach Target of Reactive Power, then finishing control; If Target of Reactive Power does not reach, then calculate current always idle by the inverter selecting to participate in idle control, and generate deviate with idle increment, the Reactive Power Margin of deviate with current controlled inverter is compared, if deviate is less than the Reactive Power Margin of current controlled inverter, carry out reactive power compensation by control inverter release Reactive Power Margin.
Preferably, if deviate is less than the Reactive Power Margin of current controlled inverter, the mode of being carried out reactive power compensation by control inverter release Reactive Power Margin is as follows: if deviate is less than or equal to the controlled Reactive Power Margin of an inverter, then Stochastic choice inverter release Reactive Power Margin; If deviate is greater than the controlled Reactive Power Margin of an inverter, then continue Stochastic choice inverter release Reactive Power Margin, until deviate has been eliminated.
The present invention, when carrying out Reactive Power Margin release to inverter, combines state estimations technology, first selects a part of inverter to discharge Reactive Power Margin, then according to deviate, then discharges Reactive Power Margin one by one to controlled inverter.So, both avoided traditional problem regulating reactive power inefficiency one by one, and turn avoid and once discharge Reactive Power Margin too much, cause the problem of overcompensation reactive power.
Preferably, judge that the mode whether Target of Reactive Power reaches is: according to the voltage difference between current bus target voltage and current busbar voltage, judge.
Preferably, reactive-load compensation equipment comprises SVG and SVC.
Preferably, the electric quantity information in step S1 at least should comprise booster stations main transformer high and low pressure side busbar voltage, main transformer high and low pressure side active power and reactive power, transformer gear.It is more comprehensive that electric quantity information is collected, and is more conducive to the accurate judgement to electric network state.
The present invention, by changing the method for salary distribution of inverter, calculating the departure of inverter and reactive power compensator in real time, introduces departure and compensates and state estimations technology in voltage power-less adjustment process.By the error compensation process to inverter and reactive power compensator reactive power/voltage control target, steady-state error between the idle output of exerting oneself of photovoltaic plant and idle control objectives is progressively reduced, until reach idle control objectives, be conducive to improving voltage-regulation qualification rate.Carry out Correction and Control target by state estimation, in whole voltage control process, safety and stability is improved, and improves grid-connected point voltage safety operation level.
Accompanying drawing explanation
Fig. 1 is a kind of photovoltaic plant AVC control method flow chart that the present invention proposes;
Fig. 2 is a kind of photovoltaic plant AVC control method local flow chart that the present invention proposes.
Embodiment
A kind of photovoltaic plant AVC control method that the present invention proposes, the departure of real-time calculating inverter and reactive power compensator, in voltage power-less adjustment process, introduce departure compensate and state estimations technology, carry out idle control by the mode progressively reducing the steady-state error between the output of photovoltaic plant reactive source and control objectives.
After the present invention receives Target of Reactive Power, can in conjunction with current idle actual value, coordinate each reactive source in field, follow the Target of Reactive Power that main website issues fast, first make full use of inverter and carry out reactive power compensation, when the reactive capability only by inverter can not meet idle increment needs, then regulating and controlling reactive power compensator carries out reactive power compensation.
The idle torque equilibrium of energy reasonable distribution inverter of the present invention, reactive power compensator, under ensureing the prerequisite of photovoltaic plant device security stable operation, realizes dynamic adjustment continuously and, to control grid-connected point voltage, meets the requirement of line voltage.
With reference to Fig. 1, photovoltaic plant AVC control method concrete steps provided by the invention are as follows:
S1, the real-time status data obtaining photovoltaic plant inverter and reactive power compensator and running state information and booster stations electric quantity information, to understand electric network state in real time, be convenient to the follow-up accurate control to photovoltaic plant.Electric quantity information at least should comprise booster stations main transformer high and low pressure side busbar voltage, main transformer high and low pressure side active power and reactive power, transformer gear.It is more comprehensive that electric quantity information is collected, and is more conducive to the accurate judgement to electric network state.
S2, reception busbar voltage control command, generate Target of Reactive Power; The voltage power-less sensitivity of photovoltaic DC-to-AC converter in combining station, the voltage power-less sensitivity of reactive power compensator the voltage power-less sensitivity of site, generate idle increment.
Idle increment is the difference of Target of Reactive Power and current idle actual value, and current idle actual value calculates according to the voltage power-less sensitivity of inverter, the voltage power-less sensitivity of reactive power compensator the voltage power-less sensitivity of site.
To the statistics of idle sensitivity, can lay the foundation for follow-up idle control, avoid due to sensitivity, cause the unreachable position of idle instruction, thus occur unexpected error.
S3, calculate controlled inverter quantity and the controlled nargin of inverter, and calculate the controlled nargin of controlled reactive-load compensation equipment.So, controlled in station idlely to exert oneself can be grasped in real time, avoid Reactive-power control blindly.
S4, distribute idle control objectives according to idle increment, generate idle control command according to idle control objectives, and be handed down to controlled inverter and controlled reactive-load compensation equipment.
The following steps specifically can be divided into perform with reference to Fig. 2, step S4:
S41, controlled to idle increment and inverter nargin total value to be compared.
S42, be less than or equal to the controlled nargin total value of inverter when idle increment, represent that required idle increment can be born by inverter, then control inverter release Reactive Power Margin is to provide reactive power.Particularly, select the multiple stage inverter in current controlled inverter group, discharged all Reactive Power Margins by the inverter group selected, non-selected inverter group keeps current working motionless, if reach Target of Reactive Power, then terminates epicycle and controls separate regression steps S2; If Target of Reactive Power does not reach, then counting statistics is current always idle by the inverter group selecting to participate in idle control, and generate deviate with idle increment, the Reactive Power Margin of deviate with current controlled inverter is compared, if deviate is less than the Reactive Power Margin of current controlled inverter, carry out reactive power compensation by control inverter release Reactive Power Margin.
In above step, if deviate is less than the Reactive Power Margin of current controlled inverter, the mode of being carried out reactive power compensation by control inverter release Reactive Power Margin is as follows: if deviate is less than or equal to the controlled Reactive Power Margin of an inverter, namely deviate can be born by an inverter, then Stochastic choice inverter release Reactive Power Margin is to reach Target of Reactive Power; If deviate is greater than the controlled Reactive Power Margin of an inverter, then continue Stochastic choice inverter release Reactive Power Margin, until deviate has been eliminated.
Generate in the process of idle control command according to idle increment and the controlled Reactive Power Margin of equipment, be applied to state estimations technology, make the idle control command of generation more pointed, be conducive to the efficiency improving Reactive-power control.
S43, when idle increment is greater than the controlled nargin total value of inverter, then control inverter discharges all Reactive Power Margins, then carries out reactive power compensation by reactive-load compensation equipment release Reactive Power Margin.So, compensated by departure, can progressively regulate reactive voltage, until realize Target of Reactive Power.
Reactive-load compensation equipment comprises SVG (Static Var Generator, static reacance generator) and SVC (Static Var Compensator, static passive compensation device).
S5, judge whether Target of Reactive Power reaches.In the present invention, after reactive power compensator and/or inverter have idle output action, according to the voltage difference between current bus target voltage and current busbar voltage, judge whether reactive power/voltage control target reaches.
If S51 Target of Reactive Power reaches, then terminate epicycle and control, return S2, start the idle control of next round.
S6, not reach when Target of Reactive Power, then according to idle control objectives and current idle calculated with actual values inverter and reactive-load compensation equipment control deviation, and generate idle correction target value and be handed down to current controlled inverter and current controlled reactive-load compensation equipment.Particularly, by the voltage power-less sensitivity of inverter set end voltage, reactive power compensator and and the reactive voltage sensitivity of site, when idle full of inverter, again idle control command is issued to reactive power compensator, in conjunction with on take turns regulation and control, the reactive power exported is corrected, controls more accurately to make voltage.
S7, after Target of Reactive Power is corrected, judge whether Target of Reactive Power reaches, if reached, then terminate epicycle and control, return S2; If do not reached, then return S6.
The present invention, by changing the method for salary distribution of inverter, calculating the departure of inverter and reactive power compensator in real time, introduces departure and compensates and state estimations technology in voltage power-less adjustment process.By the error compensation process to inverter and reactive power compensator reactive power/voltage control target, steady-state error between the idle output of exerting oneself of photovoltaic plant and idle control objectives is progressively reduced, until reach idle control objectives, be conducive to improving voltage-regulation qualification rate.Carry out Correction and Control target by state estimation, in whole voltage control process, safety and stability is improved, and improves grid-connected point voltage safety operation level.
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 AVC control method, it is characterized in that, the departure of real-time calculating inverter and reactive power compensator, in voltage power-less adjustment process, introduce departure compensate and state estimations technology, carry out idle control by the mode progressively reducing the steady-state error between the output of photovoltaic plant reactive source and control objectives; Specifically comprise the following steps:
S1, the real-time status data obtaining photovoltaic plant inverter and reactive power compensator and running state information and booster stations electric quantity information;
S2, reception busbar voltage control command, obtain Target of Reactive Power; And the voltage power-less sensitivity of photovoltaic DC-to-AC converter in combining station, the voltage power-less sensitivity of reactive power compensator the voltage power-less sensitivity of site, generate idle increment;
S3, calculate controlled inverter quantity and the controlled nargin of inverter, and calculate the controlled nargin of controlled reactive-load compensation equipment;
S4, distribute idle control objectives according to idle increment, generate idle control command according to idle control objectives, and be handed down to controlled inverter and controlled reactive-load compensation equipment;
S5, judge whether Target of Reactive Power reaches;
S51, when Target of Reactive Power reaches, then terminate epicycle control, return S2;
S6, not reach when Target of Reactive Power, then according to idle control objectives and current idle calculated with actual values inverter and reactive-load compensation equipment control deviation, and generate idle correction target value and be handed down to current controlled inverter and current controlled reactive-load compensation equipment;
S7, judge whether Target of Reactive Power reaches, if reached, then terminate epicycle and control, return S2; If do not reached, then return S6.
2. photovoltaic plant AVC control method as claimed in claim 1, it is characterized in that, step S4 specifically comprises the following steps:
S41, controlled to idle increment and inverter nargin total value to be compared;
S42, be less than or equal to the controlled nargin total value of inverter when idle increment, then control inverter release Reactive Power Margin;
S43, when idle increment is greater than the controlled nargin total value of inverter, then control inverter discharges all Reactive Power Margins, then carries out reactive power compensation by reactive-load compensation equipment.
3. photovoltaic plant AVC control method as claimed in claim 2, it is characterized in that, step S42 is specially: select the multiple stage inverter in current controlled inverter group, discharged all Reactive Power Margins by the inverter group selected; If reach Target of Reactive Power, then finishing control; If Target of Reactive Power does not reach, then calculate current always idle by the inverter selecting to participate in idle control, and generate deviate with idle increment, the Reactive Power Margin of deviate with current controlled inverter is compared, if deviate is less than the Reactive Power Margin of current controlled inverter, carry out reactive power compensation by control inverter release Reactive Power Margin.
4. photovoltaic plant AVC control method as claimed in claim 3, it is characterized in that, if deviate is less than the Reactive Power Margin of current controlled inverter, the mode of being carried out reactive power compensation by control inverter release Reactive Power Margin is as follows: if deviate is less than or equal to the controlled Reactive Power Margin of an inverter, then Stochastic choice inverter release Reactive Power Margin; If deviate is greater than the controlled Reactive Power Margin of an inverter, then continue Stochastic choice inverter release Reactive Power Margin, until deviate has been eliminated.
5. photovoltaic plant AVC control method as claimed in claim 1, is characterized in that, judge that the mode whether Target of Reactive Power reaches is: according to the voltage difference between current bus target voltage and current busbar voltage, judge.
6. photovoltaic plant AVC control method as claimed in claim 1, it is characterized in that, reactive-load compensation equipment comprises SVG and SVC.
7. photovoltaic plant AVC control method as claimed in claim 1, it is characterized in that, the electric quantity information in step S1 at least should comprise booster stations main transformer high and low pressure side busbar voltage, main transformer high and low pressure side active power and reactive power, transformer gear.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105226726A (en) * | 2015-05-13 | 2016-01-06 | 安徽立卓智能电网科技有限公司 | A kind of photovoltaic plant centralized monitoring system |
| CN105429178A (en) * | 2015-12-23 | 2016-03-23 | 国家电网公司 | Control method for photovoltaic power station AVC |
| 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 |
| CN105914755A (en) * | 2016-04-21 | 2016-08-31 | 广州供电局有限公司 | Electric power system dynamic reactive power optimization configuration method and system |
| CN109193821A (en) * | 2018-11-01 | 2019-01-11 | 阳光电源股份有限公司 | A kind of dynamic reactive compensation device and dispatching of power netwoks control system of photovoltaic plant |
| CN109787282A (en) * | 2019-01-29 | 2019-05-21 | 国电南瑞科技股份有限公司 | A kind of scale energy storage participates in new energy station reactive coordination control method and system |
| CN111969615A (en) * | 2020-07-14 | 2020-11-20 | 许继集团有限公司 | Control method and device for stabilizing power grid voltage fluctuation of energy storage power station |
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| CN104333008A (en) * | 2014-11-10 | 2015-02-04 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of wind power plant |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105226726A (en) * | 2015-05-13 | 2016-01-06 | 安徽立卓智能电网科技有限公司 | A kind of photovoltaic plant centralized monitoring system |
| CN105429178A (en) * | 2015-12-23 | 2016-03-23 | 国家电网公司 | Control method for photovoltaic power station AVC |
| 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 |
| CN105914755A (en) * | 2016-04-21 | 2016-08-31 | 广州供电局有限公司 | Electric power system dynamic reactive power optimization configuration method and system |
| CN105914755B (en) * | 2016-04-21 | 2018-07-24 | 广州供电局有限公司 | Electrical power system dynamic reactive power Optimal Configuration Method and system |
| CN109193821A (en) * | 2018-11-01 | 2019-01-11 | 阳光电源股份有限公司 | A kind of dynamic reactive compensation device and dispatching of power netwoks control system of photovoltaic plant |
| CN109787282A (en) * | 2019-01-29 | 2019-05-21 | 国电南瑞科技股份有限公司 | A kind of scale energy storage participates in new energy station reactive coordination control method and system |
| CN109787282B (en) * | 2019-01-29 | 2022-09-02 | 国电南瑞科技股份有限公司 | Large-scale energy storage participation new energy station reactive power coordination control method and system |
| CN111969615A (en) * | 2020-07-14 | 2020-11-20 | 许继集团有限公司 | Control method and device for stabilizing power grid voltage fluctuation of energy storage power station |
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