改进滞环电流控制策略在光伏并网中的研究  

Improved hysteresis current control scheme for photovoltaic grid-connected system

作　　者：马小虎[1] 袁晓玲[1] 施俊华[1] 

机构地区：[1]河海大学能源与电气学院,江苏南京211100

出　　处：《电源技术》2013年第11期2019-2022,共4页Chinese Journal of Power Sources

摘　　要：滞环电流控制已广泛应用于光伏并网逆变器技术中,由于固定环宽控制方式下功率开关器件开关频率变化范围较大,从而导致开关功率损耗增大,给滤波电路设计带来不便。提出了一种具有PID功能的变形结构模糊控制来实现变环宽滞环电流控制的方法,通过仿真研究该方法可以降低开关频率变化范围,提高电流跟踪精度,THD值减小,谐波含量减少。Hysteresis current control system has been widely used in PV grid-connected inverter technology. For a wide range of switch frequency of power switching device in fixed-band control mode, it can increase the loss of switch power and can bring inconvenience of filter circuit. A method was proposed that variable structure fuzzy control which has the PID function was used to realize variable-band hysteresis current control. Through the simulation, the method can reduce the range of switch frequency, improve the current tracking precision, and decrease the THD value and harmonic content.

关 键 词：滞环电流控制 光伏并网逆变器 变结构模糊控制 变环宽 

分 类 号：TM464[电气工程—电器]