Power Oscillation Control of Grid-Feeding Converter Considering Next Generation Grid Code During Asymmetrical Faults

Grid-feeding converters are required to maintain the operation capability and support the grid voltage during asymmetrical faults. This paper considers these two demands and proposes an active power oscillation control strategy of grid-feeding converters. By setting a flexible reference current expression with four control parameters, power allocations are mathematically derived to achieve different objectives. Thus, the asymmetrical current is injected to meet the next generation grid code and reduce the voltage unbalance factor (VUF) at the point of common coupling (PCC). The proposed strategy can also attenuate the active power oscillation and take full advantage of the converter capacity, which is implemented in two phase stationary frame without phase-locked loop. Experimental results verify the correctness of the proposed control strategy.