Analysis of Integrated STATCOM-SMES based on Three-Phase Three-Level Multi-Pulse Voltage Source Inverter for High Power Utility Applications

MOLINA, MARCELO GUSTAVO; MERCADO, PEDRO ENRIQUE; WATANABE, EDSON HIROKAZU

JOURNAL OF THE FRANKLIN INSTITUTE

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Oxford; Año: 2011 vol. 348 p. 2350 - 2377

0016-0032

This paper is aimed to investigate the operating characteristics of a static synchronous compensator (STATCOM) integrated with superconducting magnetic energy storage (SMES) for high power applications in the transmission network level. The STATCOM controller topology comprises multi-level multi-pulse neutral-point clamped-type (NPC) voltage source inverters (VSIs) using the harmonics cancellation technique, and incorporates a SMES coil. An innovative two-quadrant multi-level dc-dc converter is proposed to effectively interface the STATCOM with the superconducting  coil using a buck-boost topology with neutral point voltage control capabilities; thus enabling to simultaneously control both active and reactive power exchange with the high voltage power system. A detailed analysis of major system variables is presented, including analytical results and digital simulations using the MATLAB/Simulink environment. Moreover, a three-level control scheme is designed, including a full decoupled current control strategy in the d-q reference frame with a novel controller to prevent the STATCOM dc bus capacitors voltage drift/imbalance and an enhanced power system frequency controller.