Switching-Based Optimized Sliding-Mode Control for Capacitor Self-Voltage Balancing Operation of Seven-Level PUC Inverter

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Abstract
Seven-level Packed U-Cell (PUC7) is known as a cost-effective, low-component multilevel inverter. However, PUC7 challenge is the capacitor voltage balancing; so, it conventionally needs an additional voltage control integrated into the current control loop. Because of extra variables, control problem is further complicated for grid-connected PUC7. This paper proposes an Optimized Sliding Mode Control (OSMC) based on the current dynamical model to track the load current reference and to self-balance the capacitor voltage in both grid-connected and stand-alone operations. By optimizing the OSMC control factor using a Visual Based Optimization (VBO) method, PUC7 switching operation is controlled to self-balance the capacitor voltage while any extra voltage controller is needed. An adaptive control law has been also proposed for self-tuning of the PUC7 current reference to track the load and DC source variations. Experimental and simulation results of PUC7 prove the excellent performance of the proposed OSMC in achieving capacitor self-voltage balancing operation.
Funding Information
  • Canadian Research Chair in Electric Energy Conversion, Power Electronics
  • Natural Sciences and Engineering Research Council of Canada

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