新型太阳能并网逆变器分析研究  

Research on a New Type of Grid-connected Photovoltaic Inverter

作　　者：潘建[1] 

机构地区：[1]淮阴师范学院物理与电子电气工程学院,江苏淮安223300

出　　处：《现代电子技术》2011年第24期209-210,共2页Modern Electronics Technique

基　　金：淮安市科技支撑计划(工业)(HAG2010026)

摘　　要：传统的太阳能并网逆变器通常采用PI控制策略,但传统PI控制策略具有控制精度不高,鲁棒性较差的缺点。针对传统PI控制的缺点,对太阳能并网逆变器的控制策略进行了改进,提出一种新型的基于直接电流跟踪控制的太阳能并网逆变器控制策略。该控制策略将传统PI控制和现代重复控制理论相结合,能够有效抑制电网侧和负载侧对并网输出电流的周期性扰动,降低并网电流的THD。实验结果表明,新的控制策略可以有效改善并网电流波形,同时可以保证逆变器输出电流与电网电压的同频同相,满足太阳能并网发电的要求。PI control strategy is commonly used in traditional solar grid-connected inverters,but itn has shortcomings of low accuracy and poor robustness.In order to overcome the shortcomings of the traditional PI control,a new control strategy for the grid-connected PV inverter based on direct current tracking control is proposed in this paper.The new control strategy combined the traditional PI control with the modern repetitive control theory.It can effectively restrain the current periodic disturbance of network and load side,and reduce the THD of grid current.The experimental result shows that the new control strategy can improve the grid-connected current waveform,and guarantee the output current of the inverter is same-frequency and same-phase with grid voltage.It can meet the requirements of photovoltaic grid-connected generation.

关 键 词：太阳能发电 逆变器 直接电流跟踪控制 并网电流 

分 类 号：TN710-34[电子电信—电路与系统] TM92[电气工程—电力电子与电力传动]