A Phase-Shifted-PWM D-STATCOM Using a Modular Multilevel Cascade Converter (SSBC)-Part I: Modeling, Analysis, and Design of Current Control

作者：Ota Joao I Yutaka^*; Shibano Yuji; Niimura Naoto; Akagi Hirofumi

来源：IEEE Transactions on Industry Applications, 2015, 51(1): 279-288.

DOI：10.1109/TIA.2014.2326079

• Cascade connections
• modular multilevel cascade converters (MMCCs)
• phase-shifted pulsewidth modulation (PWM)
• static synchronous compensator (STATCOM)

This paper presents and discusses a phase-shifted-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.

• 出版日期2015-2