Abstract:
The STATic Synchronous COMpensator (STATCOM) is popular with utilities for distribution substation power quality issues. The literature describes numerous STATCOM topologies, but the Multilevel Cascaded H-bridge Inverter (MCHI) is the most flexible and energy-efficient.
This study defines a control method and transfer function for low-switching frequency and high-bandwidth MCHI power control. Under balanced loading conditions, the proposed STATCOM system controller provides vector control for reactive power or VAR compensation at the Point of Common Coupling (PCC).
Park’s transformation is used to construct STATCOM system equations in dq-coordinates. Next, the designed equations are utilized to compute the controller’s gain settings for cascade Pulse Width Modulation (PWM) STATCOMs with different voltage and current ratings. Finally, MATLAB-Simulink simulation and numerical analysis verify the suggested control scheme’s performance.
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