The use of FPGA can achieve nanosecond simulation for modular multilevel converter

however

there are still some problems

such as the difficulty of the solver development and lack of versatility. Consequently

we proposed an equivalent model rapid realization method

which adopts the backward Euler method to discretize inductance of bridge arms and capacitance of submodules

as well as Thevenin’s theorem to achieve equivalent bridge circuit

by which a fast simulation model is established. While ensuring accuracy of the simulation

the method significantly lowers the degree of difficulty of the model solver design and improves simulation rate

which realizes the 100 ns-step simulation on the FPGA board. Through the comparison among the results of primary simulation and hybrid simulation

waves of the two simulations are highly overlapped

and the error is kept within 0.5%. Besides

FPGA in loop simulation can completely simulate the operational status of bridge MMC switch

which verifies the effectiveness of the method.