大容量飞轮储能永磁电机控制策略研究

Research on the Control Strategy of Large Capacity Flywheel Energy Storage Permanent Magnet Motor

本文研究了飞轮储能系统在两种常用场景下的拓扑结构和控制策略,在电网调频、新能源电站并网的场景下,永磁电机输出交流电压经整流后输出直流电压,再通过逆变器连接电网将电能馈给电网。在轨道交通、大功率不间断电源等场景下,永磁电机输出交流电压经整流后输出直流电压连接直流负载。本文重点研究了飞轮储能系统在连接电网和连接直流负载两种应用场景下的充电和放电控制策略,为了实现飞轮储能大功率长时间放电,本文对一台1MW飞轮储能用永磁同步电机进行了研究,以满足永磁电机恒功率1MW放电3min的技术需求。最后搭建了两种应用场景下的暂态仿真模型,分别仿真了连接电网应用场景下充电和放电过程,连接直流负载应用场景下放电过程。验证了大容量飞轮储能用永磁同步发电电动机控制策略研究成果的正确性。

In this paper,the topology and control strategy of flywheel energy storage systems are studied in two common scenarios.In the scenarios of grid frequency regulation and grid connection of new energy power plants,the output AC voltage of the permanent magnet motor is rectified and then the DC voltage is output,and then the power is fed to the grid through the inverter.In scenarios such as rail transit and high-power uninterruptible power supply,the output AC voltage of the PM motor is rectified and then output DC voltage is connected to the DC load.This paper focuses on the charging and discharging control strategies for flywheel energy storage systems in two application scenarios:connecting to the grid and connecting to a DC load.In order to realise the high-power long-time discharge of flywheel energy storage,a 1MW permanent magnet synchronous motor for flywheel energy storage is investigated in this paper to meet the technical requirement of a permanent magnet motor with constant power of 1MW discharging for 3min.Finally,transient simulation models are built for two application scenarios,and the charging and discharging processes are simulated for the grid connection application scenario and the discharging process for the DC load connection application scenario,respectively.The correctness of the research results of the control strategy of the permanent magnet synchronous power generation motor for large capacity flywheel energy storage is verified.