CN105680472A - Distributed photovoltaic on-site adaptive voltage control method - Google Patents

Distributed photovoltaic on-site adaptive voltage control method Download PDF

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Publication number
CN105680472A
CN105680472A CN201510936981.5A CN201510936981A CN105680472A CN 105680472 A CN105680472 A CN 105680472A CN 201510936981 A CN201510936981 A CN 201510936981A CN 105680472 A CN105680472 A CN 105680472A
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China
Prior art keywords
voltage
distributed photovoltaic
control
grid
power generation
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Pending
Application number
CN201510936981.5A
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Chinese (zh)
Inventor
方景辉
温镇
何平
唐昕
朱晓峰
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Jiaxing Hengchuang Electric Power Design Research Institute Co Ltd
Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
Jiaxing Hengchuang Electric Power Design Research Institute Co Ltd
Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Application filed by Jiaxing Hengchuang Electric Power Design Research Institute Co Ltd, Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd filed Critical Jiaxing Hengchuang Electric Power Design Research Institute Co Ltd
Priority to CN201510936981.5A priority Critical patent/CN105680472A/en
Publication of CN105680472A publication Critical patent/CN105680472A/en
Pending legal-status Critical Current

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Classifications

    • H02J3/383—
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a distributed photovoltaic on-site adaptive voltage control method. According to the method, an adaptively-changed voltage expected range is set according to needs; the distributed photovoltaic power generation grid-connection point voltage is maintained; meanwhile, other electrical node voltages in the grid-connection region power grid are within an acceptable range so as to ensure the overall voltage level of the grid-connection region power grid; specific to different operation conditions, different distributed photovoltaic power generation adaptive voltage expected ranges are formulated; each working condition comprises a normal control mode, a disturbance control mode and a fault control mode; and control for reactive power is realized by adopting a related formula. By adoption of the distributed photovoltaic on-site adaptive voltage control method, the distributed photovoltaic power generation grid-connection voltage control capability can be improved, and the capability of the power grid in accepting PV is improved, so that reasonable and efficient photovoltaic utilization is promoted consequently.

Description

A kind of distributed photovoltaic adaptive voltage control method on the spot
Technical field
The invention belongs to distributed photovoltaic power generation field, particularly a kind of distributed photovoltaic on the spot certainlyAdapt to voltage control method.
Background technology
At present, the PV of China generating mainly comprises extensive centralized photovoltaic power station power generationAnd distributed photovoltaic power generation (DPVS, Distributed (Photovoltaicpowerstation)PhotovoltaicSystems) two kinds, PV electricity generation system, all by grid-connected inverters, is utilizedInverter control is realized meritorious, idle decoupling zero, and makes PV can adopt the idle control of inverterFor electrical network provides voltage support. Especially in the time that the high infiltration of PV is grid-connected, its inverter without power controlPressure regulation ability processed even can replace pressure regulation capacitor completely. But domestic to the grid-connected idle control of PVThe research of aspect, mainly concentrates on the grid-connected control of unity power factor, and photovoltaic and idle benefitRepay the aspects such as Global control, adjust the control of reactive power compensating ginseng by load reactive currentThe value of examining, is applicable to the reactive-load compensation to load, is difficult to be applicable to idle independent control of DPVS.In addition, under DPVS high permeability access electrical network scene, if each DPVS is additionally integratedMeasurement device and control appliance, will significantly increase the link cost of system, thereby only in systemPart DPVS sets up and measures and control appliance, and other parts DPVS is due to measurement not being setAnd control appliance, observation be will be difficult to, and control or scheduling will be difficult to realize.
Summary of the invention
The object of the invention is for the problems referred to above, propose a kind of distributed photovoltaic power generation on the spot certainlyAdapt to voltage control method, adopt adaptive approach on the spot, intelligence to adjust by the methodEconomize on electricity is pressed, and the voltage of DPVS site is maintained to voltage levvl or the acceptable electricity of expectationIn pressure limits
The distributed photovoltaic power generation of the present invention on the spot general principle of adaptive electro pressure-controlled is logicalCross the adjustment control of reactive power and active power reference value, realize the control to voltage. Work as electricityVoltage levels exceedes desired value, or while exceeding the setting at power distribution network operational administrative center, utilizesWithin voltage is maintained the scope of desired value or setting requirement by adaptive electro pressure-controlled on the spot.After distributed photovoltaic power generation scale is grid-connected, the major function of adaptive electro pressure-controlled not only on the spotBe the voltage that maintains DPVS site, but also will ensure the voltage water of grid-connected regional power gridFlat. Distributed photovoltaic power generation is adaptive electro pressure-controlled on the spot, only needs distributed photovoltaic power generation grid-connectedThe local measurement information at some place, using voltage and current measured value as the input variable of controlling, because ofThis, distributed photovoltaic power generation (DPVS) on the spot adaptive electro pressure-controlled is to disperse local control,Without and other electrical nodes between communicate, do not need power distribution network operational administrative center yetInformation communication contact.
Adaptive voltage control method is as follows on the spot for distributed photovoltaic power generation of the present invention:
Distributed photovoltaic power generation is the limit value of the expectation voltage in adaptive electro pressure-controlled on the spot, the highestVoltage limit value VmaxWith minimum voltage limit value Vmin, be the key variables of controlling, be just to realizeThe core of ground adaptive electro pressure-controlled, for this reason, sets the voltage expected range of adaptive change,Make it in maintaining the grid-connected point voltage of distributed photovoltaic power generation, ensure in grid-connected regional power gridOther electrical node voltages in tolerance interval, thereby ensure the entirety electricity of grid-connected regional power gridVoltage levels; For different operating conditions, formulate different distributed photovoltaic power generation adaptive electrosPress and expect setting range, under each operating mode, voltage is expected to be set as follows:
Normal control model: for accidental conditions, adaptive voltage is expected to survey according to voltageValue is set, the voltage of setting expects that limited field is relatively little, makes voltage maintain definitionVoltage is expected in limited field: Vmin,1≤V≤Vmax,1; Now, distributed photovoltaic is sent outElectricity operates under normal control model, operates in active power and Reactive Power Control pattern:PQ control model;
Disturbance control model: under disturbance operating condition, the setting that adaptive voltage is expected, canTo set according to the acceptable voltage maximum horizontal of this grade electrical network: Vmin,2≤V≤Vmax,2, V is setmax,2And Vmin,2Be respectively the acceptable voltage max of this grade electrical networkAnd minimum of a value, under Network Voltage Deviation constraint requirements, maintain voltage within the limits prescribed;Under disturbance operating mode, distributed photovoltaic power generation by PQ control mode switch to disturbance control model,Be reactive power/voltage control pattern, this pattern is utilized reactive power reference qref adjustment control, absorb/Send reactive power and reduce/improve voltage, thereby realize distributed photovoltaic power generation siteControl of Voltage on the spot; In the time that magnitude of voltage is too high or too low, distributed photovoltaic power generation is by Control of VoltageMinimum or the ceiling value of expecting; When distributed photovoltaic power generation does not have enough absorptions or sendsThe ability of reactive power, and voltage is while having exceeded acceptable limits, need be transferred to urgent operation workEmergent control pattern under condition;
Fault Control pattern: under the urgent operating condition of fault, voltage has exceeded acceptable limitScope processed: V < Vmin,2Or V > Vmax,2, and distributed photovoltaic power generation reached maximum canSend perception or capacitive reactive power, cannot provide again reactive power to support, for electrical network provides nothingMerit compensation; Now distributed photovoltaic power generation is switched to emergent control pattern, i.e. real power control pattern,Control voltage by active power, utilize the meritorious restriction that changes reactive power that regulates, fallLow/to increase the active power that DPVS sends, thus make voltage return to voltage limit value Vmin,2Or Vmax,2；
Control to reactive power: employing formula (1) and formula (2) realize:
{ i d r e f = ( k p + k i s ) ( P r e f - P g r i d ) i q r e f = ( k p + k i s ) ( Q r e f + &Delta;Q r e f - Q g r i d ) - - - ( 1 )
{ P m d ( k p + k i s ) ( i d r e f - i d ) - &omega;Li q + u d P m q ( k p + k i s ) ( i q r e f - i q ) + &omega;Li d + u q - - - ( 2 )
In formula, Pgrid，Qgrid，id，iqBe respectively meritorious, reactive power and meritorious, idleThe measured value of electric current; Pref、Qref，idref、iqrefFor corresponding reference value; ud，uqBe respectivelyThe measured value of meritorious, reactive voltage; kp，ki, be the control parameter of PI controller,
The control parameter of each PI controller is adjusted according to actual needs voluntarily; According to regard to ground voltageControl and need, adjust photovoltaic reactive power reference qref, the control of recycling photovoltaic combining inverter dicycloSystem, realizes voltage and controls on the spot.
Beneficial effect of the present invention: the present invention on the spot adaptive voltage control method improves distributedThe grid-connected voltage control capability of photovoltaic generation (distributed photovoltaic power generation system DPVS), and promoteElectrical network is received the ability of PV, thereby promotes the reasonable efficient application of photovoltaic.
Brief description of the drawings
Fig. 1 is Organization Chart of the present invention.
Fig. 2 is schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is further illustrated.
As shown in the figure, distributed photovoltaic power generation of the present invention adaptive voltage controlling party on the spotMethod is:
Distributed photovoltaic power generation is the limit value of the expectation voltage in adaptive electro pressure-controlled on the spot, the highestVoltage limit value VmaxWith minimum voltage limit value Vmin, be the key variables of controlling, be just to realizeThe core of ground adaptive electro pressure-controlled, for this reason, sets the voltage expected range of adaptive change,Make it in maintaining the grid-connected point voltage of distributed photovoltaic power generation, ensure in grid-connected regional power gridOther electrical node voltages in tolerance interval, thereby ensure the entirety electricity of grid-connected regional power gridVoltage levels; For different operating conditions, formulate different distributed photovoltaic power generation adaptive electrosPress and expect setting range, under each operating mode, voltage is expected to be set as follows:
Normal control model: for accidental conditions, adaptive voltage is expected to survey according to voltageValue is set, the voltage of setting expects that limited field is relatively little, makes voltage maintain definitionVoltage is expected in limited field: Vmin,1≤V≤Vmax,1; Now, distributed photovoltaic is sent outElectricity operates under normal control model, operates in active power and Reactive Power Control pattern:PQ control model;
Disturbance control model: under disturbance operating condition, the setting that adaptive voltage is expected, canTo set according to the acceptable voltage maximum horizontal of this grade electrical network: Vmin,2≤V≤Vmax,2, V is setmax,2And Vmin,2Be respectively the acceptable voltage max of this grade electrical networkAnd minimum of a value, under Network Voltage Deviation constraint requirements, maintain voltage within the limits prescribed;Under disturbance operating mode, distributed photovoltaic power generation by PQ control mode switch to disturbance control model,Be reactive power/voltage control pattern, this pattern is utilized reactive power reference qref adjustment control, absorb/Send reactive power and reduce/improve voltage, thereby realize distributed photovoltaic power generation siteControl of Voltage on the spot; In the time that magnitude of voltage is too high or too low, distributed photovoltaic power generation is by Control of VoltageMinimum or the ceiling value of expecting; When distributed photovoltaic power generation does not have enough absorptions or sendsThe ability of reactive power, and voltage is while having exceeded acceptable limits, need be transferred to urgent operation workEmergent control pattern under condition;
Fault Control pattern: under the urgent operating condition of fault, voltage has exceeded acceptable limitScope processed: V < Vmin,2Or V > Vmax,2, and distributed photovoltaic power generation reached maximum canSend perception or capacitive reactive power, cannot provide again reactive power to support, for electrical network provides nothingMerit compensation; Now distributed photovoltaic power generation is switched to emergent control pattern, i.e. real power control pattern,Control voltage by active power, utilize the meritorious restriction that changes reactive power that regulates, fallLow/to increase the active power that DPVS sends, thus make voltage return to voltage limit value Vmin,2Or Vmax,2；
Control to reactive power: employing formula (1) and formula (2) realize:
{ i d r e f = ( k p + k i s ) ( P r e f - P g r i d ) i q r e f = ( k p + k i s ) ( Q r e f + &Delta;Q r e f - Q g r i d ) - - - ( 1 )
{ P m d ( k p + k i s ) ( i d r e f - i d ) - &omega;Li q + u d P m q ( k p + k i s ) ( i q r e f - i q ) + &omega;Li d + u q - - - ( 2 )
In formula, Pgrid，Qgrid，id，iqBe respectively meritorious, reactive power and meritorious, idleThe measured value of electric current; Pref、Qref，idref、iqrefFor corresponding reference value; ud，uqBe respectivelyThe measured value of meritorious, reactive voltage; kp，ki, be the control parameter of PI controller,
The control parameter of each PI controller is adjusted according to actual needs voluntarily; According to regard to ground voltageControl and need, adjust photovoltaic reactive power reference qref, the control of recycling photovoltaic combining inverter dicycloSystem, realizes voltage and controls on the spot.

Claims (1)

1. a distributed photovoltaic power generation adaptive voltage control method on the spot, described in it is characterized in thatThe method be:
Distributed photovoltaic power generation is the limit value of the expectation voltage in adaptive electro pressure-controlled on the spot, the highestVoltage limit value VmaxWith minimum voltage limit value Vmin, be the key variables of controlling, be to realizeThe core of adaptive electro pressure-controlled on the spot, for this reason, sets the voltage of adaptive change and expectsScope, makes it in maintaining the grid-connected point voltage of distributed photovoltaic power generation, ensures grid-connectedInterior other electrical node voltages of regional power grid are in tolerance interval, thus guarantee barrierThe global voltage level of territory electrical network; For different operating conditions, formulate different distributionsFormula photovoltaic generation adaptive voltage expect setting range, under each operating mode voltage expect set asUnder:
Normal control model: for accidental conditions, adaptive voltage is expected to survey according to voltageValue is set, and the voltage of setting expects that limited field is relatively little, voltage is maintained fixedThe voltage of justice is expected in limited field: Vmin,1≤V≤Vmax,1; Now, distributedPhotovoltaic generation operates under normal control model, operates in active power and reactive powerControl model: PQ control model;
Disturbance control model: under disturbance operating condition, the setting that adaptive voltage is expected, canTo set according to the acceptable voltage maximum horizontal of this grade electrical network: Vmin,2≤V≤Vmax,2, V is setmax,2And Vmin,2Be respectively the acceptable voltage of this grade electrical networkMaximum and minimum of a value, under Network Voltage Deviation constraint requirements, maintain voltage in regulationScope in; Under disturbance operating mode, distributed photovoltaic power generation by PQ control mode switch toDisturbance control model, i.e. reactive power/voltage control pattern, this pattern is utilized reactive power referenceValue adjustment is controlled, and absorbs/sends reactive power and reduce/improve voltage, divides thereby realizeThe Control of Voltage on the spot of cloth formula photovoltaic power generation grid-connecting point; In the time that magnitude of voltage is too high or too low,Minimum or the ceiling value that distributed photovoltaic power generation is being expected Control of Voltage; When distributedPhotovoltaic generation does not have enough absorptions or sends the ability of reactive power, and voltage exceedesWhen acceptable limits, need be transferred to the emergent control pattern under urgent operating condition;
Fault Control pattern: under the urgent operating condition of fault, voltage has exceeded acceptable limitScope processed: V < Vmin,2Or V > Vmax,2, and distributed photovoltaic power generation has reached maximumCan send perception or capacitive reactive power, cannot provide reactive power to support again, be electrical networkReactive-load compensation is provided; Now distributed photovoltaic power generation is switched to emergent control pattern, hasMerit control model, controls voltage by active power, utilizes meritorious adjusting to change nothingThe restriction of merit power, reduces/increases the active power that DPVS sends, thereby make voltage extensiveArrive again voltage limit value Vmin,2Or Vmax,2。
CN201510936981.5A 2015-12-15 2015-12-15 Distributed photovoltaic on-site adaptive voltage control method Pending CN105680472A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020093758A1 (en) * 2018-11-08 2020-05-14 珠海格力电器股份有限公司 Photovoltaic electric appliance system and voltage protection value control method and apparatus thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014004961A1 (en) * 2012-06-25 2014-01-03 University Of Central Florida Research Foundation Inc. A modular inverter system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014004961A1 (en) * 2012-06-25 2014-01-03 University Of Central Florida Research Foundation Inc. A modular inverter system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
方景辉等: "电力系统保护与控制", 《分布式光伏就地自适应电压控制策略研究》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020093758A1 (en) * 2018-11-08 2020-05-14 珠海格力电器股份有限公司 Photovoltaic electric appliance system and voltage protection value control method and apparatus thereof
CN109494788B (en) * 2018-11-08 2020-09-29 珠海格力电器股份有限公司 Photovoltaic electrical appliance system and voltage protection value control method and device thereof
US11831151B2 (en) 2018-11-08 2023-11-28 Gree Electric Appliances, Inc. Of Zhuhai Photovoltaic electric appliance system, method and device of controlling voltage protection value thereof

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Application publication date: 20160615