交流励磁抽水蓄能机组暂态特性仿真分析

Transient Character Analysis of AC Excitation Pumped-storage Machine

不同于常规抽水蓄能机组,基于交流励磁电机的抽水蓄能机组可实现变速,具有提高机组工况运行效率和增强系统暂态运行稳定性的优点。本文通过建立其仿真模型,重点对其负荷扰动特性及电网侧故障的暂态特性进行仿真分析,为该机组的实际应用提供理论支撑。首先,结合交流励磁抽水蓄能机组运行特点,根据可逆水泵水轮机运行模式;分别建立了水轮机模式和水泵模式下的数学模型;结合交流励磁电机的数学模型,建立交流励磁抽水蓄能机组的联合仿真模型。其次,结合可逆水泵水轮机和交流励磁控制策略,给出了交流励磁抽水蓄能机组发电工况采用功率励磁、电动工况采用转速+功率励磁的系统控制框图。最后,基于Matlab/Simulink仿真平台搭建系统仿真模型,并对交流励磁抽水蓄能机组发电、电动工况下负荷扰动特性以及电网侧故障的暂态运行性能进行仿真分析。

Variable speed pumped-storage machine based on AC excitation technology has several advantages,such as increasing machine effciency and stability of power networks.This paper presents modeling,simulation for AC excitation machine,and focuses on analysis of transient character at load disturbance and grid faults.According to reversible pump-turbine and AC excitation machine operation mode,simulation models are established respectively.Then,power priority control strategy at generator mode and speed priority control strategy at motor mode are applied to simulation model.Finally,transient character analysis is presented with software Matlab/Simulink.