It is necessary for three-level explosion-proof inverters to have high thermal stability and good output characteristics avoiding\nproblems caused by power devices, such as IGBT, so it becomes a hot and difficult research point using only one control algorithm\nto guarantee both output characteristics and high thermal stability. Firstly, the simplified SVPWM (Space Vector Pulse Width\nModulation) algorithm was illustrated based on the NPC (neutral-point-clamped) three-level inverter, and then the quasi-square\nwave control was brought in and made into a novel holographic equivalent dual-mode modulation algorithm together with the\nsimplified SVPWM. The holographic equivalent model was established to analyze the relative advantages comparing with the\ntwo single algorithms. Finally, the dynamic output and steady power device losses were analyzed, based on which the power loss\ncalculation and system simulation were conducted as well.The experiment proved that the high-power three-level explosion-proof\ninverter has good output characteristics and thermal stability
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