For the electrification of mechanical systems and the decarbonization of power systems, the utilization of power electronics is essential. When applying advanced power semiconductor and power conversion technologies to existing systems, the verification of complex interactions, including the coupling of electrical, control, and mechanical systems, poses a challenge. Mitsubishi Heavy Industries Group has set up an environment combining actual power equipment with modeled mechanical systems to execute versatile Power Hardware-in-the-Loop Simulation for performing system verification. The test bench, using a 500 kW-class electrical equipment, enables the evaluation of phenomena up to several hundred Hz and the verification of interactions between actual equipment and models. The Group is proceeding with the application of the developed technology to a diverse range of products to improve the efficiency and reliability of system development.