The platform adopts a streamlined distributed simulation architecture: one master simulator simulates the front-end cascaded H-bridge circuit in real time with a 1 μs time step, and one slave simulator simulates the back-end high-frequency DC-DC converter with a 100 ns time step. The two simulators exchange data through fiber optics and are kept in strict synchronization by clock synchronization lines, forming a closed-loop test platform that contains the complete controlled plant and the virtual lower-level control logic.

At the communication level, the system achieves efficient data interaction between the master/phase controllers and the simulation model through a fiber aggregation control box. The control box receives system state information such as sub-module voltages and DC-side voltage from the simulation model and passes it to the master/phase controllers through low-speed fiber; the master/phase controllers calculate control commands such as modulation waves and phase-shift angles, which are distributed by the control box to each simulator: the front-end modulation wave is carrier-phase-shift modulated in the control box to generate PWM signals that drive the switching model in the master simulator; the back-end phase-shift angle is sent directly to the slave simulator, which locally generates the gate drive pulse signals. This constructs an efficient hardware-in-the-loop test system focused on verifying top-level strategies such as system-level energy management and coordinated control.