A Novel Proportional Multi-Resonant Current Controller Strategy for Reduced DC Voltage fed D-STATCOM with Internal LCL Resonance Damping
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IIT Bhubaneswar
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Dipankar De   

IIT Bhubaneswar
Power Electronics and Drives 2024;9 (44)
This work focuses on a new topology-control based D-STATCOM solution with reduced DC bus voltage requirement and with an excellent grid side performance. The proposed solution consists of main and auxiliary inverter along with a transformer and LCL filter network to achieve the required DC bus reduction. A new controller structure with two proportional-multi resonant controller for the converters with only one of the inductor current as a controlled variable ensures the active damping of the LCL resonance. The power circuit configuration assists the controller to generate a difference in the modulation signal due to non-equal gains in two controllers and helps to achieve the resonance damping without capacitor current sensor. Hence, the corresponding capacitor current sensor is eliminated. The converter operates for any PCC loading conditions and the performance of the controller is immune to the grid impedance variation. A detailed stability study is carried for the proposed controller. The proposed controller can achieve very fast dynamic response with an excellent stability margin. The proposed solution is verified through simulation studies and through a scaled-down experimental prototype.
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