负荷冲击性对独立电力系统暂态特性的影响

发布时间：2019-04-26 11:20

【摘要】：冲击负荷强烈的冲击性严重威胁到独立电力系统的安全稳定运行。针对现有评估指标无法准确、有效评估冲击负载的瞬时动态特性问题,提出了一套基于瞬时功率理论及源端关键参数的暂态评估指标,并对2种具有冲击性的常用负荷的启动、加减载等工作过程进行评估,该指标更能表征非线性负荷对独立电力系统影响的动态过程和暂态特性。通过改变2种负荷关键参数,使系统逐步达到不稳定极限;对电压、功角和频率进行稳定性分析,发现2类冲击负荷在系统中成为不稳定因素的区别在于产生冲击的功率类型不同,将分别引起系统频率失稳或电压失稳,进而造成电源的转速跌落或励磁保护。储能设备负载可采用恒功率充电或改善源端调速系统的方式,电动机负载可采用软启动或无功功率调节装置来缓解系统稳定性。
[Abstract]:The strong impact of the impact load seriously threatens the safe and stable operation of the independent power system. In order to effectively evaluate the instantaneous dynamic characteristics of impact load, a set of transient evaluation indexes based on instantaneous power theory and key parameters at source end is proposed, and the start-up of two kinds of commonly used impact loads is also presented in this paper, as the existing evaluation indexes are not accurate and the transient dynamic characteristics of impact load are effectively evaluated. The dynamic process and transient characteristics of the influence of nonlinear load on independent power system can be better characterized by the evaluation of the working process such as loading and shedding. By changing the key parameters of the two loads, the unstable limit of the system is gradually reached. According to the stability analysis of voltage, power angle and frequency, it is found that the two types of impulse load become unstable factors in the system because of the different power types, which will cause the frequency instability or voltage instability of the system, respectively. And then cause the power speed drop or excitation protection. The load of energy storage equipment can be controlled by constant power charging or by improving the speed regulation system at the source end. The motor load can be controlled by soft start or reactive power regulation device to alleviate the stability of the system.
【作者单位】：军械工程学院导弹工程系;
【基金】：国家自然科学基金(51307184)~~
【分类号】：TM712

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