Topologies and Control Strategies for High-performance Power Electronic Converters

Abstract

Distribution networks require power electronic converters that can have a fast enough response time and at the same time be able to operate stably. In this paper, a dual Boost PFC topology is used to achieve high power density and performance by connecting Boost PFC converters in parallel. SCR and switching are utilized for precise control to reduce harmonic pollution and improve power supply stability to meet the demands of precision equipment. The CCM control method, combined with direct duty cycle calculation, is used to realize efficient and intelligent control of the Boost PFC converter. The method eliminates the need for current sampling, reduces cost, and improves control speed and DSP resource utilization. The stability of the output voltage and the fast response to load changes are ensured by the precise design of the voltage control loop. The PSIM software is utilized to build a simulation circuit with 220V single-phase AC input, DC output voltage of 336V, and output power of 3.6kW with a fixed power load. Under different working conditions, the input current can track the input voltage well, and the output voltage is stable.The CCM control strategy shows the fastest regulation speed and the best voltage stability when the voltage reference value increases suddenly, the regulation time is only 30ms, and the voltage change is only 1V. Under the input voltage of 200V, the efficiency of the circuit is high at medium load, and there is room for improvement at light load and high load. Comparison with MPPT and MPC-MPPT strategies shows significant advantages.