Improved Modulation Strategy Based on Minimum Energy Storage Principle for Electrolytic-Capacitor-Less Six-Switch Converter

An improved modulation strategy based on minimum energy storage for DC-link capacitance reduction in a six-switch AC-AC converter is proposed. The proposed enables the capacitor to accumulate and release twice each complete switching cycle, achieving effect of “fast charging discharging”. Meanwhile, inversion rectification are modulated synchronously. Hence, there stored capacitor. Then, time average modeling analysis presented take insight analysis. When same voltage ripples constraint DC side conventional strategies, under has much less value even realizes non-electrolytic capacitance. Therefore, improving system efficiency, power density, output waveform quality extending life can be achieved. operation principle discussed detail. Finally, simulation model experimental prototype built verify effectiveness topology correctness strategy.