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Zero-sequence voltage injection for DC capacitor voltage balancing control of the star-connected cascaded H-bridge PWM converter under unbalanced grid

Zero-sequence voltage injection for DC capacitor voltage balancing control of the star-connected cascaded H-bridge PWM converter under unbalanced grid

Abstract:

This paper presents a dc capacitor voltage balancing convtrol method for the starconnected cascaded Hbridge PWM converter in the static synchronous compensator (STATCOM) applications. The proposed control utilizes the zerosequence voltage injection to accomplish the dc capacitor voltage balancing, and the this operation of zerosequence voltage does not affect the original reactive power control. The proposed control method also works for the low-voltage ride-through operation. The control algorithm is verified with a 220-V 1kVA STATCOM based on starconnected cascaded PWM converter, and the test results verify that all the dc capacitor voltages are still regulated at the commanded value even as the grid voltage sag occurs.

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