摘要
独立光伏发电系统采用环链结构,实现单相光伏逆变器并联供电,以提升系统容量。考虑特定负载对输出电压波形的质量要求较高,采用重复控制器作为电压外环调节器,逆变侧电感电流反馈作为内环调节器。内环电流指令限幅前后的差值作为环链传输信号,实现自动主从控制,提高系统供电的可靠性。重复控制受限于动态性能,将其与PI控制器并联作为电压环,实现复合控制。引入T型滤波器,增强逆变输出高频衰减的能力和各逆变器之间的环流抑制能力。仿真验证了采用复合控制技术的独立光伏并联发电系统具有稳暂态性能好、可靠性高的优点。
Stand-alone photovoltaic system adopts chain structure and realizes the power supply by single-phase PV inverter in parallel to increase capacity of the system. Considering the high quality of the output voltage waveform, repetitive controller is introduced as a voltage regulator, inductor current of inverter side feedback as an inner regulator. The limited difference of inner current command is used as transmission signal of chain to achieve auto master-slave, which raises the reliability of system. PI controller is paralleled to improve dynamic performance of repetitive controller. T filter is used to enhance the capacity of output frequency attenuation and to restrain the high frequency circulating current. Simulation results testify that stand-alone photovoltaic parallel system has the advantages of reliability and high quality of output waveform.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第7期88-93,共6页
Power System Protection and Control
基金
输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512709204)
