A novel power weighted synchronous control method for parallel inverters

For parallel inverters, the sinusoidal output ac voltages in the same-phase should be ensured. This paper presents a power weighted synchronous control method, which is suitable for parallel inverters of different power capabilities. The key concept of the proposed strategy is that the sinusoidal reference signal is decided by the common synchronous pulse signal, which is determined by the majority of the inverters, and the power weighting factor is taken into account. By doing so, the sinusoidal reference signal cannot be interrupted even though one of the modules is fault or dropout. Firstly, the operation principle is described by comparing the conventional method and the proposed method in this paper. Secondly, the hardware implementation is given. Then a detailed reliability failure analysis of synchronous regulation is presented, which shows that higher precision of the control system is obtained compared with the existing methods. At last, the experimental results prove that the control strategy can be well achieved by the designed circuit, and the synchronization of each module is realized.