CN103972901A - Single-stage type photovoltaic system reactive power control strategy for improving voltage regulation performance of photovoltaic access point - Google Patents

Single-stage type photovoltaic system reactive power control strategy for improving voltage regulation performance of photovoltaic access point Download PDF

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Publication number
CN103972901A
CN103972901A CN201410228142.3A CN201410228142A CN103972901A CN 103972901 A CN103972901 A CN 103972901A CN 201410228142 A CN201410228142 A CN 201410228142A CN 103972901 A CN103972901 A CN 103972901A
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China
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photovoltaic
current
grid
access point
reactive
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CN201410228142.3A
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CN103972901B (en
Inventor
黄亚峰
穆钢
严干贵
冯利民
姚玉平
叶德武
仲相成
于洋
李龙
刘嘉
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Northeast Electric Power University
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Northeast Dianli University
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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

Abstract

The invention discloses single-stage type photovoltaic system reactive power control strategy for improving the voltage regulation performance of a photovoltaic access point. The strategy is characterized by comprising measuring a photovoltaic grid-connection point voltage valid value, measuring photovoltaic grid-connection current, and performing park transformation processing to obtain grid-connection active current; aiming at tracking the grid-connection point voltage, presetting one voltage reference value; calculating the real-time limiting amplitude of inactive current; obtaining a reactive current adjustment reference value controlled and output from a final inverter; calculating a maximum value and a minimum value of the reactive current; achieving control on reactive interaction of a photovoltaic inverter system and an access power grid by taking an obtained reactive current reference instruction as a reactive control target of the photovoltaic inverter system, and thus the voltage regulation performance of the photovoltaic access point is improved.

Description

Improve the stage photovoltaic single System Reactive Power control strategy of photovoltaic access point voltage-regulation performance
Technical field
The present invention relates to photovoltaic networking generator operation control field, is a kind of stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance.
Background technology
When the weak electrical network of large-scale photovoltaic electricity generation system access infrastructure relative thin, due to reactive power deficiency, systems face voltage operation level is low, even Voltage Instability risk.The present invention is directed to this Run-time scenario, a kind of stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance is provided.
Current existing photovoltaic DC-to-AC converter control strategy, conventionally adopt unity power factor mode to move, and during by operation of power networks a little less than photovoltaic inverting system access infrastructure relative thin, the idle adjusting potentiality of excavating as far as possible photovoltaic DC-to-AC converter participate in the idle adjustment of system voltage and are necessary, in order to improve the voltage running quality of access electrical network, in control strategy, add the idle control strategy of adjusting towards access point voltage.
Summary of the invention
Technical problem to be solved by this invention is, impact based on electric network impedance on system run all right, a kind of stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance has been proposed, it can regulate and control to realize photovoltaic inverting system and the idle mutual control that accesses electrical network by reactive current, thereby improve photovoltaic access point voltage-regulation performance, improve the operation level of access point voltage.
Solving the technical scheme that its technical problem adopts is, a kind of stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance, is characterized in that, it comprises the following steps:
(1) measure grid-connected point voltage effective value U pcc, measure grid-connected current i ga, i gb, i gc, through Park Transformation, processing draws grid-connected active current I gd;
(2) to follow the trail of grid-connected point voltage as target, a given voltage reference value U pcc.ref, both voltage deviation input PI controllers, calculate a reactive current reference instruction I' through the time-domain expression of PI controller gqref, the time-domain expression I' of PI controller gqref=K p(U pcc.ref-U pcc)+K i∫ (U pcc.ref-U pcc) dt;
(3) calculate the real-time amplitude limit link of reactive current, amplitude limit link is according to inequality and active current I in step (1) gdcalculate reactive current I gqmaximum and minimum value
(4) the idle reference instruction I' in step (2) gqrefthe reactive current that draws final inverter control output by the amplitude limit link of step (3) regulates reference value I gqref;
(5) reactive current reference instruction step (4) being obtained, as the idle control target of photovoltaic inverting system, realizes photovoltaic inverting system and the idle mutual control that accesses electrical network, thereby improves photovoltaic access point voltage-regulation performance.
The stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance of the present invention, can regulate and control to realize photovoltaic inverting system and the idle mutual control that accesses electrical network by reactive current, thereby improve photovoltaic access point voltage-regulation performance, improve the operation level of access point voltage.
Brief description of the drawings
Fig. 1 is the stage photovoltaic single System Reactive Power control strategy block diagram that improves photovoltaic access point voltage-regulation performance;
Fig. 2 is under unity power factor, the signal of photovoltaic inverting system networking access point voltage effective value waveform;
Fig. 3 is that after adopting the stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance, access point voltage effective value waveform is illustrated.
Embodiment
Utilize drawings and Examples to be elaborated to a kind of stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance of the present invention below.
With reference to Fig. 1, the stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance of the present invention, comprises the following steps:
(1) measure grid-connected point voltage effective value U pcc, measure grid-connected current i ga, i gb, i gc, through Park Transformation, processing draws grid-connected active current I gd;
(2) to follow the trail of grid-connected point voltage as target, a given voltage reference value U pcc.ref, both voltage deviation input PI controllers, calculate a reactive current reference instruction I' through the time-domain expression of PI controller gqref, wherein, the time-domain expression of PI controller: I' gqref=K p(U pcc.ref-U pcc)+K i∫ (U pcc.ref-U pcc) dt;
(3) calculate the real-time amplitude limit link of reactive current, amplitude limit link is according to inequality and active current I in step (1) gdcalculate out reactive current I gqmaximum and minimum value
(4) the idle reference instruction I' in step (2) gqrefthe reactive current that draws final inverter control output by the amplitude limit link of step (3) regulates reference value I gqref;
(5) reactive current reference instruction step (4) being obtained, as the idle control target of photovoltaic inverting system, realizes photovoltaic inverting system and the idle mutual control that accesses electrical network, thereby improves photovoltaic access point voltage-regulation performance.
With reference to Fig. 2, from Fig. 2, under unity power factor, photovoltaic inverting system networking access point voltage effective value waveform can be found out, under unity power factor mode, along with illumination condition strengthens, inject electric network active increased power, access point voltage declines gradually, is starkly lower than 0.93p.u level, when meritorious exerting oneself exceedes a timing, there is Voltage Instability in system, access point voltage and power are acutely remarkable, jeopardizes system security of operation.
With reference to Fig. 3, adopt after the stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance of the present invention, access point voltage can maintain the 1.0p.u of appointment.Although in the time that illumination condition is undergone mutation, there are some shakes in adjustment process, can return to target voltage with speed faster, and effectively evade Voltage Instability problem.
The present embodiment has been verified validity and the feasibility of the designed stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance.

Claims (1)

1. a stage photovoltaic single System Reactive Power control strategy that improves photovoltaic access point voltage-regulation performance, is characterized in that, it comprises the following steps:
(1) measure grid-connected point voltage effective value U pcc, measure grid-connected current i ga, i gb, i gc, through Park Transformation, processing draws grid-connected active current I gd;
(2) to follow the trail of grid-connected point voltage as target, a given voltage reference value U pcc.ref, both voltage deviation input PI controllers, calculate a reactive current reference instruction I' through the time-domain expression of PI controller gqref, the time-domain expression I' of PI controller gqref=K p(U pcc.ref-U pcc)+K i∫ (U pcc.ref-U pcc) dt;
(3) calculate the real-time amplitude limit link of reactive current, amplitude limit link is according to inequality and active current I in step (1) gdcalculate reactive current I gqmaximum and minimum value
(4) the idle reference instruction I' in step (2) gqrefthe reactive current that draws final inverter control output by the amplitude limit link of step (3) regulates reference value I gqref;
(5) reactive current reference instruction step (4) being obtained, as the idle control target of photovoltaic inverting system, realizes photovoltaic inverting system and the idle mutual control that accesses electrical network, thereby improves photovoltaic access point voltage-regulation performance.
CN201410228142.3A 2014-05-27 2014-05-27 Improve the stage photovoltaic single System Reactive Power control strategy of photovoltaic access point voltage-regulation performance Expired - Fee Related CN103972901B (en)

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CN106230030A (en) * 2016-09-14 2016-12-14 东北电力大学 Multiterminal input photovoltaic parallel in system power control strategy based on PQ decoupling
CN113410845A (en) * 2020-03-17 2021-09-17 南京南瑞继保电气有限公司 Photovoltaic power station voltage rapid control method and device

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CN102868167A (en) * 2012-09-11 2013-01-09 南京中德保护控制系统有限公司 Reactive voltage control method of photovoltaic power station

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CN102856916A (en) * 2012-04-10 2013-01-02 北京昆兰新能源技术有限公司 Reactive power control method and circuit of single-phase photovoltaic inverter
CN102868167A (en) * 2012-09-11 2013-01-09 南京中德保护控制系统有限公司 Reactive voltage control method of photovoltaic power station

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106230030A (en) * 2016-09-14 2016-12-14 东北电力大学 Multiterminal input photovoltaic parallel in system power control strategy based on PQ decoupling
CN106230030B (en) * 2016-09-14 2019-11-22 东北电力大学 Multiterminal based on PQ decoupling input photovoltaic parallel in system power control strategy
CN113410845A (en) * 2020-03-17 2021-09-17 南京南瑞继保电气有限公司 Photovoltaic power station voltage rapid control method and device
CN113410845B (en) * 2020-03-17 2022-07-22 南京南瑞继保电气有限公司 Photovoltaic power station voltage rapid control method and device

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