Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Multi-loop voltage control strategy of half-bridge voltage balancers with current sensorless scheme

  • Moon, Jaeeun (Department of Electrical Engineering, Konkuk University) ;
  • Lee, Taeyeong (Department of Electrical Engineering, Konkuk University) ;
  • Han, Sanghun (Department of Electrical Engineering, Konkuk University) ;
  • Cho, Younghoon (Department of Electrical Engineering, Konkuk University)
  • Received : 2020.04.01
  • Accepted : 2020.05.04
  • Published : 2020.07.20
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Abstract

This paper proposes a multi-loop voltage balancing strategy for half-bridge voltage balancers. The proposed multi-loop scheme consists of a voltage controller and a current variation controller without current sensors. The proposed current variation controller (CVC) aims to regulate the derivative of the average inductor current to be zero at the steady-states as well as to increase the damping of the entire control loop. Furthermore, the CVC is implemented based on a current sensorless scheme. For this purpose, a simple method for detecting current variation by using dc-link voltages and a control model is also proposed. To secure the stability of the proposed CVC with the current sensorless method, a well-known type II regulator is adopted, and its design procedure is detailed. The proposed multi-loop strategy is applied to a 2.4-kW half-bridge voltage balancer. Both simulation and experimental results show good agreements with the theoretical analyses.

Keywords

Acknowledgement

This work was supported by "Human Resources Program in Energy Technology" of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry& Energy, Rebublic of Korea (No.20194030202370). This research was supported by Korea Electric Power Corporation.(Grant number: R18XA06-61)

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