火电机组涉网特性模型参数敏感性研究

Research on Sensibility of Thermal Power Unit’s Network Related Characteristic Model Parameters

考虑回热系统、PLU控制回路等因素的影响,构建了较为完善的火电机组涉网特性模型。在单机无穷大的电网模型基础上,基于RTDS系统,搭建网源协调仿真模型开展多种工况下的参数扰动特性仿真研究。仿真结果表明:火电机组涉网特性模型中的高压缸容积时间常数、油动机时间常数对电力系统稳定性影响较大。为后续火电机组涉网特性模型参数现场实测工作提供了指导。

The relatively perfect model of the thermal power unit’s grid-related characteristics is established considering the influence of regenerative system and PLU control loop. Based on RTDS system and on the basis of single machine-infinite grid model, the grid-power coordination simulation model is built to simulate the parameter disturbance characteristics under various working conditions. The simulation results show that time constant of the high pressure cylinder volume and the time constant of the oil engine have a great influence on power system stability. It provides guidance for the field measurement of the parameters of the grid-involved characteristic model of subsequent thermal power units.