Two-stage voltage control strategy for PV plants based on variable droop control

Voltage violation is an important factor that restricts grid-connected photovoltaic system. The utilization of PV plant's reactive power capability is an effective measure to mitigate voltage violation. This paper proposes two-stage voltage control strategy to enhance the voltage support capabi...

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Bibliographic Details
Published in:International journal of electronics 2020-02, Vol.107 (2), p.250-271
Main Authors: Wang, Qi, Yu, Zhipeng, Dai, Jianfeng, Yan, Quanchun, Fan, Lixin, Tang, Yi
Format: Article
Language:English
Subjects:
Active control
active power curtailment control
adaptive gains
Adaptive systems
Adequacy
Electric potential
Photovoltaic cells
Reactive power
reactive power adequacy
Strategy
the priority of active power curtailment
Voltage
Voltage violation
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Summary:Voltage violation is an important factor that restricts grid-connected photovoltaic system. The utilization of PV plant's reactive power capability is an effective measure to mitigate voltage violation. This paper proposes two-stage voltage control strategy to enhance the voltage support capability of photovoltaic grid-connected system. In first stage, adaptive gains are set according to the maximum reactive capacity of each PV plant in order to distribute reactive power among PV plants more reasonably, avoiding certain PV plants operating in the limit state for a long time. In second stage, when the reactive power capacity is insufficient, the priority of active power curtailment for each PV plant is calculated in real time. Active power curtailment control will be performed in PV plants with high priority to released more reactive power capacity for voltage support. The simulation results carried out by PSCAD/EMTDC software demonstrated that this strategy can effectively solve the voltage violation problem. Meanwhile, the proposed strategy not only can exploit reactive capacity of each PV plant as much as possible to avoid certain PV plants operating in the limit state for a long time, but also can reduce the amount of active power curtailment when reactive power adequacy is insufficient.
ISSN:0020-7217
1362-3060
DOI:10.1080/00207217.2019.1643041