Extended Order Generalized Integral Control based Circulating Current Mitigating Scheme in Modular Multi Level Converters- A Balancing Approach
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1
J C Bose UST, YMCA
 
2
Dev bhoomi Uttarakhand University
 
 
Corresponding author
Pradeep Kumar   

J C Bose UST, YMCA
 
 
Power Electronics and Drives 2025;10 (45)
 
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ABSTRACT
In Modular Multilevel Converters (MMC), circulating currents consist of both DC and AC components. However, these currents are significantly affected by even harmonic distortions, which introduce ripples in the sub-module (SM) capacitor voltages. These ripples contribute to the circulating currents, increasing the voltage stress on the SM switches and adversely impacting overall system performance. This paper presents a systematic approach to mitigating circulating currents by employing an Extended Order Generalized Integrator (EOGI), which effectively removes even harmonic components from the converter’s legs. The proposed solution has been evaluated against existing methods and demonstrated to offer enhanced robustness in the face of parameter uncertainties and sudden load variations. The scheme was initially validated using Matlab/Simulink, with further real-time performance verification conducted via OPAL RT simulation and experiments, yielding promising results
eISSN:2543-4292
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