Extended Order Generalized Integral Control based
Circulating Current Mitigating Scheme in Modular
Multi Level Converters- A Balancing Approach
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Dev bhoomi Uttarakhand University
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