基于PWM脉冲延时补偿的直接并联逆变器均流方法

Average-current control based on PWM pulse delay compensation method of parallel inverters

针对输出端直接并联的脉冲间歇式工作逆变电源输出线路阻抗的微小差异会引起较大的环流问题,建立了基于主从控制策略的逆变系统等效模型,推导了环流关于补偿相角的数学表达式。研究结果表明,驱动信号传输延迟和线路阻抗差异是影响环流的关键因素。为此,提出了一种通过主动补偿驱动脉冲延时来抑制环流的方法,并在半实物仿真平台上验证了该方法的有效性。

For the pulse intermittent working inverter power supply of direct output parallel connection, a slight difference of output line impedance will cause a large circulation. In order to suppress circulation, an equivalent model of inverter system is established based on master-slave control strategy and derived mathematical expressions about the circulation, which is represented by compensation phase angle. It is pointed out that the difference of the drive signal transmission delay and the line impedance are the key factors affecting the circulation, and a method which suppresses current by actively compensating drive pulse delay is proposed. Finally, the effectiveness of the method is verified by carrying out experiment on the semi-physical simulation platform.