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发明公开
CN104362874A 一种抑制模块化光伏逆变器环流的方法 无效 - 驳回 转让

一种抑制模块化光伏逆变器环流的方法
摘要：
本发明涉及一种抑制模块化光伏逆变器环流的方法，通过设置一个同步信号，传输给各个用于控制光伏逆变器并产生PWM波的控制器，然后进行载波同步。进一步地，当同步信号出现上升沿或者下降沿时，将各个控制器的计数器清零，来完成载波同步。通过该方式，即可实现模块化光伏并网逆变器中每个控制器生成的PWM波的载波同步，从而能够抑制模块环流的产生，降低了光伏逆变器系统的损耗，避免了并联逆变器模块电流应力的不均衡和电磁干扰，增加了开关器件的寿命，提高了逆变器的效率。
摘要（英）：

The invention relates to a method for restraining ring current of a modularized photovoltaic inverter. Carrier synchronization is carried out after a synchronizing signal is transmitted to each controller, and the controllers are used for controlling the photovoltaic inverter and generating PWM (pulse-width modulation) waves. Further, when the synchronizing signal has a rising edge or a falling edge, a counter of each controller is reset to finish carrier synchronization. By adoption of the method for restraining ring current of the modularized photovoltaic inverter, carrier synchronization of the PWM waves generated by the controllers in the modularized photovoltaic inverter can be realized, and accordingly generation of module ring current can be restrained, loss of a photovoltaic inverter system is reduced, electromagnetic interference and imbalance of current stress of parallel inverter modules are avoided, service life of a switch device is prolonged, and efficiency of the inverter is improved.

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