Optimal design of a PV-BES system considering the impact of the converter capacity on the voltage support and the load supply

Due to the proliferation of renewable energy sources (RESs), the tripping of them may lead to cascading failures when faults occur in distribution networks. Therefore, not only the fault ride-through (FRT) capability but also the voltage support function is required for RESs by the grid code. Besides the control strategy, the converter capacity is also an import impact factors to FRT performance. Based on the control requirements, this paper proposes an optimal design scheme to optimize the capacity of PV-BES system components, and further optimize system operation based on the optimal capacities, which is able to enhance voltage support performance and decrease load interruption during fault periods, without ignoring the economic feasibility. In the proposed design model, the converter occupation model and reward-punishment energy scheduling scheme during FRT are established based on fault feature, control requirements and component characters. The nonlinear converter capacity constraints are linearized by the piecewise linearization method. A fault scenario generation scheme is proposed to guarantee the applicability of the proposed design method in diverse disturbance conditions. The proposed design scheme is fully tested. Compared with existing methods, 32.82% of annual costs can be reduced.