温控负荷对电力系统低频振荡的影响

Effects of thermostatically controlled load on low-frequency oscillations in power systems

温控负荷是电力系统最为重要的负荷类型之一,它对电力系统的低频振荡具有重要的影响。本文建立了用于小干扰稳定分析的温控负荷的数学模型,以一个4机2区域的典型系统为算例在MATLAB电力系统分析工具箱(PSAT)中对温控负荷接入电力系统后对系统低频振荡的影响进行了仿真分析,研究了温控负荷所占比例及其负荷参数对系统低频振荡和阻尼的影响。

Load model plays an important role in the power system stability analysis and digital simulation. In the composite load model there is a load which is controlled by thermostat controller, such as industrial heating, elec-tric water heater and electric space heater. With the proportion of the thermostatically controlled load increasing in the composite load, the influence to the power system small disturbance stability is more significant. For this reason research object of this paper is the thermostatically controlled load. The load model which based on the equation of the thermal transients due to the thermostat operation was built. Based on the power system analysis toolbox （PSAT） in MATLAB, a typical example of a d-generator 2-area interconnected power system is given. The impact of the parameters of this load on power system＇ s low-frequency oscillations was discussed and some valuable con- clusions are drawn.