分布式发电系统无缝切换控制策略_王晓寰著.pdfVIP

2012 年 2 月 电 工 技 术 学 报 Vol.27 No. 2 第 27 卷第 2 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Feb. 2012 分布式发电系统无缝切换控制策略 王晓寰 张纯江 （燕山大学电气工程学院 电力电子节能与传动控制河北省重点实验室 秦皇岛 066004 ） 摘要 双模式工作的分布式发电系统存在并网运行与独立运行工作模式切换及电流型控制 与电压型控制的控制模式切换。实现运行模式的无缝切换，减小电流电压冲击，是双模式分布式 发电技术的关键问题。传统无缝切换控制算法忽略两种切换的不同步性，造成切换过程中出现并 网电流冲击大，负载电压波动等问题。本文提出一种电压电流加权控制策略，在不增加系统复杂 度的情况下，保证切换过程中的暂态变量均可控，抑制电压电流冲击，实现无缝切换。最后在样 机实验中证明了该方法的正确性和可行性。 关键词：双模式 无缝切换 并网 脱网 中图分类号：TM461 Study of Control Strategy for Seamless Transfer of Grid-Connected Distributed Generation Systems Wang Xiaohuan Zhang Chunjiang （Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province Institute of Electrical Engineering Yanshan University Qinhuangdao 066004 China ） Abstract The dual-mode inverters for distributed generation (DG) systems can operate in grid-connected and stand-alone mode. When the DG transfer the mode between the grid-connected and stand-alone mode, the control mode changes between the voltage control in stand-alone mode and current control in grid-connected mode. The key technology of dual-mode inverter is to achieve the seamless transfer and reduce the impact of current and voltage. During process of the transfer, the traditional seamless transfer control algorithm neglect non-synchronization of two kinds of transition, which address the issue of seamless transition assuming the work mode switching and control mode switching at the same time to complete. If ignoring the situation, it will cause vol