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
丁勇(1991—),男,博士研究生,主要研究方向:新能源系统变流器控制。E-mail:yong_dsyuct@163.com
茆美琴(1961—),女,通信作者,博士,教授,博士生导师,主要研究方向:微电网能量管理系统、电动汽车参与电网调度。E-mail:mmqmail@163.com
张金桃(1998—),女,硕士研究生,主要研究方向:电力电子系统建模与控制。E-mail:zjtmail@163.com
收稿:2025-10-15,
修回:2026-01-28,
网络首发:2026-05-21,
纸质出版:2026-10-25
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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.
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。
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.
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