Comparative Study of Two Control Strategies for Capacitor Voltage Balancing in Three-Level Boost Converter for Photovoltaic Grid-Connected Power System
Conference paper
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Abstract
The three-level boost converter (TLBC) which is applied in the photovoltaic (PV) grid-connected power generation system has an inherent defect of the midpoint potential shift. This paper compares two control strategies which can solve the problem. They are duty cycle independent control strategy and pulse phase delay control strategy. Then the principles of the two control strategies are analyzed, and in order to carry out simulation experiments more accurately and quickly, the characteristics of the strategies are verified based on the co-simulation of PSIM + Matlab. The results show that the duty cycle independent control strategy has better performance under the condition of the bias voltage is larger.
Keywords
Duty cycle independent control strategy Pulse phase delay control strategy Co-simulation Three-level boost converterReferences
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