一种三角波注入的三相四桥臂逆变器控制策略  

A Triangle Wave Injection Control Strategy for Three- Phase Four- Leg Inverter

作　　者：邵宇[1] 马海啸[1] 

机构地区：[1]南京邮电大学自动化学院,南京210003

出　　处：《电测与仪表》2014年第19期81-85,109,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51107057)

摘　　要：基于三相四桥臂电压型PWM逆变器的工作原理,研究了双闭环控制策略,并在此基础上研究了利用三相半波整流器实现三角波注入的三相四桥臂逆变器控制策略。此方法采用双闭环控制方法控制前三桥臂,采用三相半波整流器对前三相调制信号进行处理以获得第四桥臂信号控制,系统结构简单、易于控制。系统可采用纯模拟器件实现,有效地避免了DSP处理能力有限对PWM开关频率的限制,有效提高系统的开关频率,具有动态响应速度快,输出电压波形谐波含量低等特点。此外,三角波注入提高了直流电压利用率,增强了系统带不平衡负载的能力。仿真结果进一步验证了该控制策略的正确性与可行性。The voltage feedback dual closed- loop control strategy has been researched in this paper based on the operating principle of the three- phase four- leg voltage source PWM inverter,And the three- phase half- wave rectifier has been adopted to propose a triangle wave injection control strategy for three- phase four- leg inverter. The dual closed- loop control method has been adopted to control three former legs,and the three- phase half- wave rectifier has been used to achieve the former three phase modulation signals so as to generate the control signal for the fourth leg,which makes the system structure simple and easy to control. The system can be realized by pure analog devices so as to avoid the restriction of DSP processing ability and increase the switch frequency of the system effectively. It has a fast dynamic response and low harmonic component in output voltage waveform. In addition,the triangle wave injection will improve the utilization rate of DC voltage and enhance the capacity of the system with unbalanced load.The simulation results further verify the accuracy and the feasibility of the proposed control strategy.

关 键 词：三相四桥臂 逆变器 电压双闭环控制 三角波注入 

分 类 号：TM464[电气工程—电器]