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1. A PHASE-SHIFTED-PWM D-STATCOM USING A
MODULAR MULTILEVEL CASCADE CONVERTER
(SSBC)—PART I: MODELING, ANALYSIS,
AND DESIGN OF CURRENT CONTROL
ABSTRACT:
This paper presents and discusses a phaseshifted-PWM distribution static
synchronous compensator (D-STATCOM) using the modular multilevel cascade converter based
on single-star bridge cells (MMCC-SSBC). A three-phase 140-V 10-kVA SSBC-based
STATCOM with a cascade count N = 6 is designed, constructed, and tested for verifying the
performance and functionality of the medium-voltage D-STATCOM in both steady and transient
states. The 13-level line-to-neutral (25-level line-to-line) voltage at the ac side yields an almost
sinusoidal line current with a total harmonic distortion value of 1.7%. An analytical model for
the phase-shifted PWM is proposed to design the current control gains. Two phase-shifted PWM
methods, which are named as one-cell and all-cells update methods, are theoretically and
experimentally compared. The all-cells update method can reduce the inherent time delay, thus
resulting in a faster and more stable system response than the one-cell update method..