A Modified Algorithm for the L/C-based Switch Model of Power Converters in Real-Time Simulation Based on FPGA

In order to solve the problem of virtual power loss introduced by the L/C-based switch model in real-time simulation of power electronic converters, a modified algorithm is proposed which can be adopted in the L/C-based switch model. This paper analyzes the causes of virtual power loss from a numerical algorithm perspective and concludes that the primary cause is the initial error of the L/C-based switch model during switching. Therefore, an additional modified algorithm is proposed to eliminate it. To minimize the impact of the proposed algorithm on the computation speed and resource consumption of field-programmable gate array (FPGA) in real-time simulation, an FPGA implementation architecture is proposed. Compared with the conventional electromagnetic transient simulation algorithm, the proposed algorithm only requires one additional clock cycle and barely increases the resource consumption. The effectiveness and superiority of the proposed algorithm are verified on a self-built FPGA-based real-time simulation platform.