Control strategy of pulsed power elimination for high-speed elevator based on hybrid energy storage Converter

Abstract

High-speed elevator is widely used in smart city, which has the electrical characteristics of high power, short duration and high frequency. The pulsed power caused by high-speed elevator will disturb the voltage frequency and worsen the power quality. Besides, the instantaneous high-power demands may lead to insufficient capacity of distributed network. Hybrid energy storage converter using battery and supercapacitor is an effective solution for this issue. A control strategy of bidirectional pulsed power elimination for high-speed elevator based on hybrid energy storage converter is proposed in this paper. The control strategy is composed of two parts. On the one hand, a real-time pulsed power detection algorithm is utilized to identify and separate the pulsed power caused by high-speed elevator. On the other hand, the control strategy for battery and supercapacitor is carefully designed respectively to achieve a coordinate work. The proposed strategy makes full use of the high-energy density of battery and the high-power density of supercapacitor, which helps achieve a quick and accurate elimination of pulsed power. The effectiveness of the proposed strategy is verified by simulation.