In a single-phase power conversion system, bulky Electrolytic-capacitors(E-caps) are always used in voltage source converters at the DC-link to buffer the twice fundamental frequency pulsation power introduced by instantaneous unbalanced power between the AC and DC sides, and mitigate the harmonics from the AC side. However, the E-cap will cause harmful effects on the system, such as reducing the efficiency and shorting the lifetime of system. The E-cap free methods were identified as three types: reducing ...
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