Islanded and Grid-connected/Off-grid Switching Control for Inverters Based on Unified Power and Voltage Controller

DING Yong; MAO Meiqin; ZHANG Jintao

doi:10.7500/AEPS20251015001

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Islanded and Grid-connected/Off-grid Switching Control for Inverters Based on Unified Power and Voltage Controller

Application Research | 更新时间：2026-10-22

- Islanded and Grid-connected/Off-grid Switching Control for Inverters Based on Unified Power and Voltage Controller
- Automation of Electric Power Systems Vol. 50, Issue 20, Pages: 179-190(2026)
- 作者机构：
  
  1.合肥工业大学光伏系统教育部工程研究中心，安徽省合肥市 230009
  2.合肥理工学院新能源工程学院，安徽省合肥市 238000
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(51577047);Program of Introducing Talents of Discipline to Universities (“111” Program)(BP0719039)
- DOI：10.7500/AEPS20251015001
  CLC：
- Received：15 October 2025，
  
  Revised：2026-01-28，
  
  Online First：21 May 2026，
  
  Published：25 October 2026
- 稿件说明：
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丁勇,茆美琴,张金桃.基于功率/电压统一控制器的逆变器孤岛及并离网切换控制[J].电力系统自动化,2026,50(20):179-190.

DING Yong,MAO Meiqin,ZHANG Jintao.Islanded and Grid-connected/Off-grid Switching Control for Inverters Based on Unified Power and Voltage Controller[J].Automation of Electric Power Systems,2026,50(20):179-190.
丁勇,茆美琴,张金桃.基于功率/电压统一控制器的逆变器孤岛及并离网切换控制[J].电力系统自动化,2026,50(20):179-190. DOI： 10.7500/AEPS20251015001.

DING Yong,MAO Meiqin,ZHANG Jintao.Islanded and Grid-connected/Off-grid Switching Control for Inverters Based on Unified Power and Voltage Controller[J].Automation of Electric Power Systems,2026,50(20):179-190. DOI： 10.7500/AEPS20251015001.

摘要

基于类振荡器的无锁相环功率/电压统一控制器（OR-PLL-less UPVC)为并网逆变器适应复杂电网工况运行提供了一种新方法，但基础OR-PLL-less UPVC不具备在孤岛及并离网切换场景下运行的能力。为此，文中引入补偿电流生成模块和预同步电流生成模块，构造改进OR-PLL-less UPVC，实现了该控制器孤岛零压自启动及并离网双向无缝切换控制。首先，阐述了基于补偿电流生成模块的改进OR-PLL-less UPVC在孤岛场景下的电压自构建与调节原理，分析了其孤岛模式运行的稳定性。其次，介绍了预同步电流生成模块的结构与工作原理，进而分析了逆变器在并离网双向切换时的动态性能。最后，通过仿真及实时控制器硬件在环实验，对所提方法的有效性进行了验证。结果表明，采用改进OR-PLL-less UPVC的逆变器可在20 ms内实现孤岛零压自启动和计划内并离网切换，在40 ms内实现计划外并离网切换，满足同期条件后约5~10 ms完成计划内离并网切换，且所有双向切换过程均无冲击电流产生。

Abstract

The oscillator-resembled phase-locked loop-less unified power and voltage controller (OR-PLL-less UPVC) provides a new solution for grid-connected inverters to adapt to the varying and complex grid conditions. However

the OR-PLL-less UPVC does not have the capability of islanded and grid-connected/off-grid switching operation. To this end

this paper develops an enhanced OR-PLL-less UPVC by introducing a compensation current generation module and a pre-synchronization current generation module

which achieves zero-voltage self-start in the islanded mode and bidirectional seamless switching of grid-connected and off-grid modes. First

the voltage self-formation and regulation principles of the OR-PLL-less UPVC based on the compensation current generation module in the islanded mode are described

and the stability of the system in the islanded mode is further analyzed. Next

the structure and operation principle of the pre-synchronization current generation module are introduced

followed by the analysis of the dynamic performance of bidirectional switching of grid-connected and off-grid modes. Finally

the effectiveness of the proposed method is verified through the simulation and real-time controller hardware-in-the-loop experiments. The results show that the inverter using the enhanced OR-PLL-less UPVC can achieve the zero-voltage self-start in the islanded mode and the scheduled switching from the grid-connected mode to the off-grid mode in 20 ms

and the unscheduled switching from the grid-connected mode to the off-grid mode in 40 ms. After meeting the synchronization conditions

the scheduled switching from the off-grid mode to the grid-connected mode occurs within 5 ms to 10 ms

and no inrush current is generated during all bidirectional switching processes.

关键词

Keywords

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