High-Power Voltage Source Converter for Integration of Battery in Power System

Abstract

To address grid instability caused by intermittent renewable energy, this work proposes utility-scale battery energy storage (BES) integration using a hybrid multilevel and multipulse voltage source converter (VSC) topology, which overcomes the limitations of conventional converters in efficiency, scalability and harmonic performance for high-power, high-voltage applications. VSC employs 13-level H-bridge converters and 30-pulse high voltage converters to mitigate voltage harmonics. By combining multipulse technique with selective harmonics elimination, low total harmonic distortion is achieved for VSC output voltage and grid currents. Utilising multiple cascaded H-bridge (CHB) converters and transformers increases VSC power and energy capacity for BES plant to deliver energy at a 400-kV voltage level to grid. A 1000-MW VSC with a 6000-MWh BES plant is simulated in MATLAB and implemented on a real-time platform to study its steady-state, harmonics and dynamic performances.