Semimonthly

ISSN 1000-1026

CN 32-1180/TP

+Advanced Search 中文版
Control Strategy of High Voltage Ride Through for Adjusting Reactive Current Based on Transient Power Characteristics
Author:
Affiliation:

1.Maintenance Company of State Grid Anhui Electric Power Co., Ltd., Hefei 230001, China;2.College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China;3.China Electric Power Research Institute (Nanjing), Nanjing 210003, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No.51777058).

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
    Abstract:

    Traditional control strategy of high voltage ride through (HVRT) for photovoltaic (PV) grid-connected inverter (GCI) improves reactive power output at the cost of reducing active power, which is difficult to achieve a balance between grid-side current and DC bus voltage. And it suppresses the transient impact caused by sudden voltage and current changes after the fault removal. Based on the analysis on the transient power characteristics of high voltage, an HVRT control strategy that maintains active power output and adjusts the reference value of reactive current is proposed. Firstly, a small-signal model is used to analyze the transient power characteristics of HVRT, which reveals that the key of suppressing voltage recovery is the constant active power and reactive redundancy on grid side. Secondly, a method for estimating the reference value of reactive current is proposed according to the voltage surge amplitude. On this basis, by combining with active current control, the control capacity of the GCI with three different voltage surge amplitudes is discussed, and the control strategies of HVRT are given respectively. Finally, the simulation and experiments verify the effectiveness of the proposed control strategies.

    表 3 Table 3
    图1 光伏发电系统并网模型Fig.1 Grid-connected model of photovoltaic power generation system
    图2 GCI网侧电压关系向量图Fig.2 Voltage vector diagram of GCI on grid side
    图3 HVRT电压调整流程图Fig.3 Flow chart of voltage regulation during HVRT
    图4 故障前后系统电压、电流、功率变化曲线Fig.4 Variation curves of system voltage, current and power before and after fault
    图5 不同控制策略下GCI控制范围对比图Fig.5 Contrast diagrams for GCI control ranges of different control strategies
    图 d-q坐标系下的GCI外环控制器Fig. Outer-loop controller of the GCI in d-q coordinate
    图 d-q坐标系下的GCI控制框图Fig. Control block diagram of GCI in d-q coordinates
    图 系统电压、电流仿真结果Fig. Simulation results of voltage and current
    图 GCI功率输出仿真结果Fig. Simulation results of GCI power output
    图 i d, ref、 i q, ref仿真结果Fig. Simulation results of i d, ref and i d, ref
    图 HVRT控制前后系统电压、电流控制效果图Fig. Control effects of voltage and current before and after the HVRT control
    图 实验平台Fig. Experimental platform
    图 HVRT控制前 U t和 I ac三相波形图Fig. Three-phase voltage U tand current I acwaveforms before the HVRT control
    图 HVRT控制后 U t和 I ac三相波形图Fig. Three-phase voltage U t and current I ac waveforms after the HVRT control
    图 HVRT控制前系统电压、电流变化曲线Fig. Voltage and current curves of the system before the HVRT control
    图 HVRT控制后系统电压、电流变化曲线Fig. Voltage and current curves of the system after the HVRT control
    表 1 Table 1
    表 2 Table 2
    Reference
    Related
    Cited by
Get Citation

LI Man,WANG Bing,QU Linan,et al.Control Strategy of High Voltage Ride Through for Adjusting Reactive Current Based on Transient Power Characteristics[J].Automation of Electric Power Systems,2020,44(6):59-66.DOI:10.7500/AEPS20190603011

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:June 03,2019
  • Revised:July 14,2019
  • Adopted:
  • Online: March 21,2020
  • Published: