Control Strategy for Grid Tied and Islanding Mode of Four Leg Converters

TAO Yan

doi:10.13296/j.1001-1609.hva.2016.11.030

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Control Strategy for Grid Tied and Islanding Mode of Four Leg Converters

更新时间：2025-04-26

- Control Strategy for Grid Tied and Islanding Mode of Four Leg Converters
- High VoltageApparatus Vol. 52, Issue 11, Pages: 181-187(2016)
- 作者机构：
  
  湖南铁道职业技术学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2016.11.030
  CLC： TM46
- Published：2016
- 稿件说明：
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[1]陶艳.基于三相四桥臂的双模式变流器控制策略研究[J].高压电器,2016,52(11):181-187.

TAO Yan. Control Strategy for Grid Tied and Islanding Mode of Four Leg Converters[J]. High voltageapparatus, 2016, 52(11): 181-187.
[1]陶艳.基于三相四桥臂的双模式变流器控制策略研究[J].高压电器,2016,52(11):181-187. DOI： 10.13296/j.1001-1609.hva.2016.11.030.

TAO Yan. Control Strategy for Grid Tied and Islanding Mode of Four Leg Converters[J]. High voltageapparatus, 2016, 52(11): 181-187. DOI： 10.13296/j.1001-1609.hva.2016.11.030.

摘要

针对微网系统在离网模式下

给不平衡负荷供电之一问题

文中采用三相四桥臂作为双模式变流器拓扑

并设计了并网与离网双模式工作及并离网模式切换的控制策略

可解决离网模式下不平衡负载引起的电压不平衡问题。根据不同模式下三相四桥臂变流器的数学模型

采用电网电压定向的电感电流闭环控制策略实现并网模式运行

采用双同步旋转坐标系下的正负序电压控制以及零序电压的比例谐振控制策略实现离网模式运行。同时

采用一种控制模式的平滑切换方法来实现并网与离网两种模式的独立运行。最后

通过仿真对采用的双模式变流器控制策略进行了验证。仿真结果表明

采用的双模式控制策略在并网模式下可以准确跟踪功率指令

在离网模式下可有效抑制不平衡负载的扰动

实现输出电压平衡。在并离网切换过程中

该控制方法能够减小负载电压变化与输出电流的冲击

实现负载的不间断供电。

Abstract

For the problem caused by the unbalanced load in microgrid working in islanding mode

a three phase four-leg topology is adopted as a double mode converter to operate in both of grid-tied and islanding mode and the voltage unbalance issue is mitigated in islanding mode. In grid-tied mode

the inductor current is controlled based on grid voltage orientation and the unsymmetrical output voltage is controlled in positive and negative synchronous frames in islanding mode based on the mathematical model. Especially

the zero sequence voltage is suppressed by resonant regulator. The two modes can work independently through smooth transition. Finally

the double mode strategy is verified by simulation. The simulation results show that the control method can track the power command accurately in grid-tied mode

and suppress the disturbances and output symmetrical voltage under unbalanced loads. In modes transition

the method can reduce the transient voltage and inrush current

and achieve the reliable and uninterrupted power supply for loads.

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