摘要
太阳能光伏发电系统有独立运行和并网运行两种工作模式,实现这两种工作模式的无缝切换,是双模式运行分布式电源发电并网技术的关键问题之一。在分析光伏发电系统特点的基础上,提出一种运行控制策略。该策略为对光伏电源的逆变器进行多环反馈控制,同时在并网过程中加入电压加权控制,离网过程中加入电流加权控制,抑制切换过程中并网电流和负载电压的冲击,波动在电力系统允许的范围之内。采用PSCAD/EMTDC软件对双模式运行光伏发电系统进行仿真分析,仿真结果表明,实现了双模式运行的无缝切换,验证了所提控制策略的有效性和可行性。
Solar photovoltaic systems have independent and grid-connected operation modes, seamless switching between these two modes is one of the key issues of grid-connected techniques for DG generation system with dual-mode opera- tion. A control strategy is proposed based on the analysis of PV system characteristics, in which multi-loop feedback control is taken for the inverter of photovoltaic generation, voltage weighted control is added in the grid-connected process, and the current weighted control is also added in the independent process. Therefore, it inhibits the impact of grid-connected current and the load voltage in the switc- hing process, and makes their fluctuation within the permis- sible range. The PV generation system with dual-mode oper- ation system is simulated and analyzed by using PSCAD/ EMTDC software, and the results show that the seamless switching control is realized and the feasibility and effective- ness of the proposed control strategy are verified.
出处
《现代电力》
北大核心
2014年第2期55-59,共5页
Modern Electric Power
关键词
光伏发电
独立运行
并网运行
无缝切换
多环反馈控制
photovoltaic power generation
independent op-eration
grid-connected operation
seamless switching
multi-loop feedback control
