CN204761035U - Automatic voltage control system of distributing type photovoltaic power plant - Google Patents

Automatic voltage control system of distributing type photovoltaic power plant Download PDF

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Publication number
CN204761035U
CN204761035U CN201520550110.5U CN201520550110U CN204761035U CN 204761035 U CN204761035 U CN 204761035U CN 201520550110 U CN201520550110 U CN 201520550110U CN 204761035 U CN204761035 U CN 204761035U
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power
photovoltaic
power plant
reactive power
converter
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任岩
杨峰
洪晶
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THREE GORGES NENGSHIDA ELECTRIC CO Ltd
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THREE GORGES NENGSHIDA ELECTRIC CO Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

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Abstract

The utility model provides an automatic voltage control system of distributing type photovoltaic power plant which characterized in that, the power plant always and site department installation power plant and site monitoring system (1), always obtain and the three -phase grid voltage of site department, total reactive power's real -time data, private network monitored control system (2) through being independent of aforementioned power plant and site monitoring system (1) are connected through protocol converter (6) and every photovoltaic inverter (7) through AVC automatic voltage controller (3), and it is right that dispatch system (4) are accepted simultaneously in AVC automatic voltage controller (3) the reactive power instruction that the power station was issued to realize the networking of one -to -many connects through switch (5) and ethernet optic fibre. The system passes through centralized control, and each photovoltaic inverter's idle ability in the make full use of power station provides required idle to the electric wire netting, adjusts grid voltage, and the extra reactive power compensator such as SVCSVG that are equipped with of fungible photovoltaic power plant satisfy the electric wire netting and to photovoltaic power plant's idle requirement, reduce the power station running cost.

Description

A kind of distributed photovoltaic power station automatic voltage control system
Technical field
The utility model belongs to technical field of electric power system control, particularly relates to a kind of photovoltaic plant without the need to configuring the automatism voltage control technology of the reactive power compensators such as SVC/SVG.
Background technology
" GB/T-19964-2012 photo-voltaic power generation station access power system technology specifies " requires that photovoltaic plant possesses certain reactive power and regulates and line voltage control ability.In order to meet the demands, the photovoltaic plant built in recent years has generally all installed reactive power compensator additional, as common SVC/SVG etc., and (SVC Static Var Compensator, SVG static reacance generator) achieve the quick adjustment of reactive power, achieve line voltage regulation and control simultaneously.But the SVC/SVG equipment cost of this additional configuration is high, and once need the lasting at substantial electricity charge after putting into operation, burden is added to power station investment and economical operation.
Photovoltaic DC-to-AC converter generally uses decoupled active and reactive to control, and each photovoltaic DC-to-AC converter can independently to electrical network conveying reactive power.Industry code requirements photovoltaic DC-to-AC converter meets within the scope of-0.95 ~ 0.95 power factor dynamically adjustable under specified meritorious condition of exerting oneself, and after conversion, every platform photovoltaic DC-to-AC converter can realize maximum 0.31 the doubly reactive power of specified meritorious capacity.If make full use of the reactive capability of photovoltaic DC-to-AC converter self, alternative SVC/SVG is idle to electrical network conveying, regulates line voltage, thus reduces power station investment operating cost.
Summary of the invention
For making full use of photovoltaic DC-to-AC converter reactive power compensation planning, the utility model provides a kind of distributed photovoltaic power station automatic voltage control system.
The technical solution adopted in the utility model is as follows:
The feature of described distributed photovoltaic power station automatic voltage control system is, installs power plant and site monitoring system at total also site place of power plant, obtains total and the three-phase power grid voltage at site place, always reactive power real time data; By independent of aforementioned power plant and the private network supervisory control system of site monitoring system be connected with every platform photovoltaic DC-to-AC converter through protocol converter by AVC automatism voltage control device, AVC automatism voltage control device accepts the reactive power instruction that dispatching patcher issues described power station simultaneously, and is connected by the networking that switch and Ethernet optical fiber realize one-to-many.
In power plant and site installation detecting system, obtain the real time data of grid-connected point voltage, total reactive power, total active power.System can be set to voltage automatic control mode and reactive power scheduling method.When being set to voltage automatic control mode, if voltage deviation value Δ U is in the voltage deviation dead band threshold value preset, then photovoltaic plant does not carry out reactive power compensation, otherwise calculates reactive power compensation reference value as required compensating reactive power reference value; When being set to reactive power scheduling method, then calculate idle deviate; If idle deviate is in the idle deviation dead band threshold value preset, then photovoltaic plant does not change idle output, otherwise using idle deviate as required compensating reactive power reference value.
System-computed goes out the reactive power desired value of every platform photovoltaic DC-to-AC converter, comprises the following steps:
(1) obtain the number of units Ni of current grid-connected photovoltaic DC-to-AC converter by complex control system in station, power grade Pi, obtains the active power summation of all combining inverters;
(2) obtain the reactive power power Qi of current grid-connected photovoltaic DC-to-AC converter by complex control system in station, obtain all combining inverter reactive power power summations;
(3) obtain the reactive power ratio of each photovoltaic DC-to-AC converter respectively divided by power summation Pmax with the power grade Pi of current grid-connected all photovoltaic DC-to-AC converters;
(4) with total reactive power respectively with inverter separately reactive power ratio be multiplied and obtain the reactive power set-point of each photovoltaic DC-to-AC converter, the order of corresponding reactive power is exported to each combining inverter;
Communication modes between system with photovoltaic DC-to-AC converter is: system is connected with every platform photovoltaic DC-to-AC converter by the private network independent of Power Station Monitored Control System, is realized the networking of one-to-many by switch and Ethernet optical fiber.Comprise the following steps:
(1) system calculates the idle instruction of every platform inverter according to distributed idle distribution method, with " (equipment 1 number+equipment 1 is idle instruction)+(equipment 2 number+equipment 2 is idle instruction)+... (the idle instruction of equipment N numbering+equipment N) " form composition information frame, and issued 10 times continuously in private network by broadcast mode.
(2) every platform photovoltaic DC-to-AC converter is all equipped with respective protocol converter, resolve the idle instruction extracting respective corresponding inverter after protocol converter receives broadcast message, and idle instruction is sent to inverter with bussing techniques such as canbus, profibus or RS485.
(3) inverter performs idle instruction, sends corresponding reactive power.
Described system passes through centralized control, make full use of the reactive power capability of each photovoltaic DC-to-AC converter in power station, there is provided required idle to electrical network, regulate line voltage, the reactive power compensators such as the SVC/SVG of alternative photovoltaic plant optional equipment, meet the idle requirement of electrical network to photovoltaic plant, reduce power station operating cost.
Accompanying drawing explanation
Fig. 1 is the utility model system communication figure;
Fig. 2 is the utility model control flow chart.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further details:
As shown in Figure 1, 2.A kind of distributed photovoltaic power station automatic voltage control system, installs power plant and site monitoring system 1 at total also site place of power plant, obtains total and the three-phase power grid voltage at site place, always reactive power real time data; By independent of aforementioned power plant and the private network supervisory control system 2 of site monitoring system 1 be connected with every platform photovoltaic DC-to-AC converter 7 through protocol converter 6 by AVC automatism voltage control device 3, AVC automatism voltage control device 3 accepts the reactive power instruction that dispatching patcher 4 issues described power station simultaneously, and is connected by the networking that switch 5 and Ethernet optical fiber realize one-to-many.
Described every platform photovoltaic DC-to-AC converter 7 is equipped with a protocol converter 6 all separately, resolve the idle instruction extracting respective corresponding inverter after protocol converter receives broadcast message, and idle instruction is sent to inverter with canbus, profibus or RS485 bus form.
Described photovoltaic DC-to-AC converter 7, for performing idle instruction, sends corresponding reactive power.
Described AVC automatism voltage control device 3 is for obtaining the number of units N of current grid-connected photovoltaic DC-to-AC converter i, power grade P iwith reactive power power Qi, and the addition of the power grade of all photovoltaic DC-to-AC converters is obtained active power summation P max=P 1* N 1+ P 2* N 2+ ... .+P i* N i, all inverter reactive power power summation Q in=Q 1+ Q 2+ ... Qi.
System can be set to voltage automatic control mode and reactive power scheduling method.
When being set to voltage automatic control mode, by Δ U=|Utarg-Umea| calculating voltage deviate Δ U; If voltage deviation value Δ U is in the voltage deviation dead band threshold value preset, then photovoltaic plant does not carry out reactive power compensation, otherwise calculates reactive power compensation reference value Δ Q, and using Δ Q as required compensating reactive power reference value;
When being set to reactive power scheduling method, then calculate idle deviate Δ Q according to formula Δ Q=|Qtarg-Qmea|; If idle deviate Δ Q is in the idle deviation dead band threshold value preset, then photovoltaic plant does not change idle output, otherwise using Δ Q as required compensating reactive power reference value; .
System-computed goes out the reactive power desired value of every platform photovoltaic DC-to-AC converter, comprises the following steps:
(1) obtain the number of units Ni of current grid-connected photovoltaic DC-to-AC converter by complex control system in station, power grade Pi, obtains the active power summation Pmax=P1*N1+P2*N2+ of all combining inverters ... .+Pi*Ni;
(2) obtain the reactive power power Qi of current grid-connected photovoltaic DC-to-AC converter by complex control system in station, obtain all combining inverter reactive power power summation Qin=Q1+Q2+ ... Qi;
(3) obtain the reactive power ratio Pi/Pmax of each photovoltaic DC-to-AC converter respectively divided by power summation Pmax with the power grade Pi of current grid-connected all photovoltaic DC-to-AC converters;
(3) with total reactive power respectively with inverter separately reactive power ratio be multiplied and obtain reactive power set-point Qi_ref=(Δ Q+Qin) the * Pi/Pmax of each photovoltaic DC-to-AC converter, corresponding reactive power instruction is exported to each combining inverter;
Communication modes between system with photovoltaic DC-to-AC converter is: system is connected with every platform photovoltaic DC-to-AC converter by the private network independent of Power Station Monitored Control System, is realized the networking of one-to-many by switch and Ethernet optical fiber.Comprise the following steps:
(1) system calculates the idle instruction of every platform inverter according to distributed idle distribution method, with " (equipment 1 number+equipment 1 is idle instruction)+(equipment 2 number+equipment 2 is idle instruction)+... (the idle instruction of equipment N numbering+equipment N) " form composition information frame, and issued 10 times continuously in private network by broadcast mode.
(2) every platform photovoltaic DC-to-AC converter is all equipped with respective protocol converter, resolve the idle instruction extracting respective corresponding inverter after protocol converter receives broadcast message, and idle instruction is sent to inverter with bussing techniques such as canbus, profibus or RS485.

Claims (2)

1. a distributed photovoltaic power station automatic voltage control system, is characterized in that, installs power plant and site monitoring system (1) at total also site place of power plant, obtains total and the three-phase power grid voltage at site place, always reactive power real time data; By independent of aforementioned power plant and the private network supervisory control system (2) of site monitoring system (1) be connected with every platform photovoltaic DC-to-AC converter (7) through protocol converter (6) by AVC automatism voltage control device (3), AVC automatism voltage control device (3) accepts the reactive power instruction that dispatching patcher (4) issues described power station simultaneously, and is connected by the networking that switch (5) and Ethernet optical fiber realize one-to-many.
2. distributed photovoltaic power station as claimed in claim 1 automatic voltage control system, it is characterized in that, described every platform photovoltaic DC-to-AC converter (7) is equipped with a protocol converter (6) all separately, resolve the idle instruction extracting respective corresponding inverter after protocol converter receives broadcast message, and idle instruction is sent to inverter with canbus, profibus or RS485 bus form.
CN201520550110.5U 2015-07-27 2015-07-27 Automatic voltage control system of distributing type photovoltaic power plant Active CN204761035U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108206525A (en) * 2016-12-19 2018-06-26 中国电力科学研究院 Photo-voltaic power generation station reactive compensation system and method based on inverter and the private network that communicates
CN114243721A (en) * 2021-11-23 2022-03-25 国电南瑞科技股份有限公司 Reactive compensation method and system for photovoltaic power station
CN114256972A (en) * 2021-12-06 2022-03-29 青岛鼎信通讯股份有限公司 Photovoltaic inverter monitoring control system and method based on acquisition terminal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108206525A (en) * 2016-12-19 2018-06-26 中国电力科学研究院 Photo-voltaic power generation station reactive compensation system and method based on inverter and the private network that communicates
CN114243721A (en) * 2021-11-23 2022-03-25 国电南瑞科技股份有限公司 Reactive compensation method and system for photovoltaic power station
CN114256972A (en) * 2021-12-06 2022-03-29 青岛鼎信通讯股份有限公司 Photovoltaic inverter monitoring control system and method based on acquisition terminal

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