An Alternating-master-salve Parallel Control Research for Single Phase Paralleled Inverters Based on CAN Bus

A novel alternating-master-salve control strategy for paralleling inverter is proposed, which merely make use of CAN bus to achieve the high precision of synchronization and fast current-sharing control. Only single interconnection bus is requires and simple arithmetic is used by the proposed scheme. Moreover, the paralleled inverters act as master in turn during each cycle of the output voltage and the paralleled modules are identical. There are not difference between master and slave and the parallel system will still operate normally under either paralleled module fault, so N+1 redundancy can be achieved. The experimental results verify good static and dynamic current-sharing performance by adopting the parallel strategy. And the parallel system also has a good parallel performance under the linear and nonlinear load