Multi-Pulse SHE-PWM Modulated VSC Based Grid Connected Large-Capacity Solar PV Plant with Battery Energy Storage

Abstract

In this paper, a grid connected large-capacity solar photovoltaic (PV) plant is configured with an 18-pulse SHE-PWM modulated voltage source converters (VSCs). The battery energy storage (BES) is used with the solar PV plant to store solar energy during daytime and supply to the grid at night. BES is also allowed the solar PV plant to participate in the grid for primary frequency control. This 18-pulse SHE-PWM VSC is configured using three different phase-shifted medium voltage (MV) transformers to realize the 18-pulse voltage waveform and thus from VSC output, voltage harmonics of lower order are eliminated. Further, the VSC is soft-switched using selective harmonics elimination (SHE) pulse-width modulation (PWM) technique to reduce the higher-order harmonics contained in the VSC output voltage. A 150MWp solar PV plant with 75MW and 300MWh BES dynamic and steady-state response are obtained MATLAB-Simulink.