E3S Web Conf.
Volume 186, 20202020 The 3rd International Conference on Electrical Engineering and Green Energy (CEEGE 2020)
|Number of page(s)||6|
|Section||Smart Grid Control and Optimization|
|Published online||24 August 2020|
An Improved Control Strategy for the Bus Interlinking Converter Based on Three-level Topology in AC-DC Hybrid Microgrid
Electric Power Research Institute, State Grid Shanxi Electric Power Research Institute, Taiyuan 030000, China
2 College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030000, China
Considering the increasing requirements of the AC-DC hybrid microgrid (HMG) for the transmission power capacity and voltage level, the several bus interface converters (BICs) with the two-level PWM converter topology, need to be connected between AC bus and DC bus in parallel, which could generate circulating current and cycle power. The cost of the modular multilevel converter topology based BIC is too high. Hence, this paper proposes to apply the BIC with three-level topology to the HMG, and a droop control strategy with the midpoint potential hysteresis regulation link is designed, which can effectively suppress the fluctuation of midpoint potential without affecting the normal operation of the BIC in the grid connected or off mode. In addition, the principle of neutral point fluctuation and the process of hysteresis control are introduced, and the detailed design of dual-mode control strategy based on droop curve are also given. Finally, the effectiveness of the improved control strategy is verified by simulation.
© The Authors, published by EDP Sciences, 2020
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