Yongzhen Chen

Study on the model of elevator regeneration energy and its energy storage control method

The battery energy storage system (BESS) insisting of Li4Ti5O12 (LTO)-based batteries is put forward in this paper in order to suppress the voltage fluctuation of the DC grid of elevator caused by regeneration energy of the traction machine. Based on the mathematical model of the regenerative power set up in MatLab/Simulink, the capacity and control method of BESS is designed to effectively achieve the absorption and release of the regeneration energy. Moreover, a dynamic control strategy is researched to improve its applicability in actual system. The simulation results show that BESS could well restrain the grid voltage within the safety working range and availably reduce the total energy consumption of the elevator.

Development of supervising system for battery energy storage system based on the two-level architecture

The real-time monitoring of status parameters, such as cell voltage and state of charge (SOC), is an important guarantee of the safety operation of the battery energy storage system (BESS). And the two-level architecture of hardware system which includes several battery management units (BMU) and the central management unit (CMU) is designed with the communication protocol and data conversion algorithm for achieving the data acquisition and communication. Moreover, an enhanced SOC method involving the resting time and the terminal voltage is researched and programmed in the software system. The battery supervising system is verified by lots of experiments that it could satisfy the monitoring demand of BESS and has improved the accuracy of SOC estimation effectively.