Research on Improving Photovoltaic Fault Voltage Support Capability by Virtual Impedance and Reactive Current Control

HE Zhaohui; CAO Rui; LIU Haipeng; ZHOU Cheng

doi:10.14044/j.1674-1757.pcrpc.2022.05.007

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Research on Improving Photovoltaic Fault Voltage Support Capability by Virtual Impedance and Reactive Current Control

更新时间：2024-09-21

- Research on Improving Photovoltaic Fault Voltage Support Capability by Virtual Impedance and Reactive Current Control
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 43, Issue 5, Pages: 42-49(2022)
- 作者机构：
  
  南瑞集团(国网电力科学研究院)有限公司智能电网保护和运行控制国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2022.05.007
  CLC： TM615
- Published：2022，
- 稿件说明：
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HE ZHAOHUI, CAO RUI, LIU HAIPENG, et al. Research on Improving Photovoltaic Fault Voltage Support Capability by Virtual Impedance and Reactive Current Control. [J]. Power capacitor & reactive power compensation, 2022, 43(5): 42-49.
DOI：

HE ZHAOHUI, CAO RUI, LIU HAIPENG, et al. Research on Improving Photovoltaic Fault Voltage Support Capability by Virtual Impedance and Reactive Current Control. [J]. Power capacitor & reactive power compensation, 2022, 43(5): 42-49. DOI： 10.14044/j.1674-1757.pcrpc.2022.05.007.

摘要

光伏发电并网系统通过公共耦合点与电网相连，当网侧发生短路时，并网系统会因为电压突变造成设备脱网等严重事故。当故障切除后又会因为电网电压骤升，增加逆变器直流侧过压、过流风险。本文引入虚拟阻抗来改变电压控制环节的参考信号，起到故障期间电压支撑作用，通过分析发生对称和不对称短路故障后的正、负序电压、电流，得出虚拟阻抗幅值及阻感比。针对故障切除后电压骤升带来的暂态冲击问题，分析有功、无功功率变化情况，提出一种无功电流控制策略来稳定并网点母线电压。将上述控制策略通过Matlab/Simulink仿真和试验，验证本文方案可以使光伏发电并网系统平稳穿越网侧故障，故障切除后无电压震荡现象。

Abstract

The grid-connected system of photovoltaic power generation is connected to the grid through the common coupling point. In case of short circuit on the grid side

the grid-connected system will cause such serious accidents as equipment off grid due to voltage leap. After the fault is removed

the risk of overvoltage and over-current on DC side of inverter is increased due to the voltage swell of grid. The virtual impedance is introduced in this paper to change the reference signal of voltage control linkso as to play a role of voltage support during the fault period. The virtual impedance amplitude and impedance ratio are obtained through analyzing the positive and negative sequence voltage and current after symmetrical and asymmetrical short-circuit fault. In view of the transient impact due to voltage swell after the removal of the fault as well as the analysis of variation of the active and reactive power

a kind of reactive current control strategy is proposed to stabilize bus voltage of the grid-connected point. It is verified by Mattab/Simulink simulation and test of above control strategy that the scheme in this paper can make the photovoltaic grid connected system pass through the grid side fault smoothlyand no voltage oscillation phenomena is appeared after removal of the fault.

关键词

光伏发电并网系统电压突变电压骤升虚拟阻抗无功电流控制

Keywords

photovoltaic power grid connected systemvoltage mutationvoltage surgevirtual impedancereactive current control

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