直流电压不平衡下的单相级联PWM整流器无锁相环均压控制  

Voltage-Sharing Control of Single-Phase Cascaded PWM Rectifier Without Phase-Lock Loop Under Unbalanced DC Voltage Condition

作　　者：杨韬[1] 帅智康[1] 兰征[1] 周柯[2] 涂春鸣[1] 盘宏斌[3] 

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082 [2]广西电网公司电力科学研究院,广西壮族自治区南宁市530023 [3]湘潭大学信息工程学院,湖南省湘潭市411100

出　　处：《电网技术》2015年第4期1167-1172,共6页Power System Technology

基　　金：国家自然科学基金项目(51377051);国家自然科学基金青年基金项目(51207048)~~

摘　　要：在单相级联脉冲宽度调制(pulse width modulation,PWM)整流器中,直流电压不平衡情况下的均压控制要求较高,控制性能受锁相环影响较大。为此,提出了一种应用于单相级联PWM整流器中的无锁相环控制策略。利用在两相静止坐标系下瞬时功率与电压、电流的关系计算出指令电流信号,以实现电网电流对电压的跟踪控制;此外,叠加无锁相环均压指令,实现各级均压控制;同时采用准比例谐振控制器实现电流内环无静差控制。仿真结果验证了该无锁相环控制策略的有效性。As for single-phase cascaded pulse width modulation （PWM） filter since the control performance is sensitive to the phase-lock loop, so there is a higher demand on the voltage sharing control under the unbalanced DC voltage. For this reason, a phase-lock loopless control strategy applied in single-phase cascaded PWM filter is proposed. Utilizing the relations among instantaneous power, voltage and current in two-phase static coordinate system the instruction current signal is calculated to implement the real-time tracking of grid current to grid voltage. Besides, phase-lock loopless voltage sharing instruction signals of different levels in the cascaded PWM filter are superposed to the modulation signals respectively to correct power imbalance quantities in corresponding levels of the cascaded PWM filter to implement the voltage sharing control of different levels, meanwhile, the quasi-proportional resonant controller is used to implement the astatic control of ct/rrent inner loop. The validity of the proposed phase-lock loopless control strategy is verified by simulation results.

关 键 词：级联PWM整流器 直流电压不平衡 无锁相环 比例谐振控制器 

分 类 号：TM475[电气工程—电器]