广东电网失稳因素研究新视角与实用方法

  目的  目前，广东电网采用的大电网安全稳定分析思路与方法能较好满足生产运行实际需求，但也存在一定不足，无法站在全局角度简单有效的厘清诸多因素对系统安全稳定的影响，无法快捷甄别系统失稳主导因素。  方法  在此背景下，按“有无对比”的思路，通过逐个“隔离”影响因素的的方法来研究各因素对系统稳定的影响，并提出了具体实现方法。  结果  采用提出的新方法对珠三角电网电压失稳问题进行了研究，分析结果表明马达负荷与常规直流的暂态特性对系统稳定均具有重大影响，马达负荷对系统稳定性更具基础性作用，常规直流无功暂态特性对系统稳定性的负面影响仅在某些特定场景才体现得较为明显。  结论  算例表明:提出的方法能快速高效分析各因素对系统安全稳定的影响，深化对事物本质的认识，并且在某些方面可以得到传统方法无法得出的结论。

New Perspective and Pragmatic Method for Studying Causes of Instability of Guangdong Power Grid

［Introduction］ At present， power grid security and stability analysis practices adopted by Guangdong Power Grid can basically meet the needs of power system operations， but there are some shortcomings. It is impossible to clarify the impact of causes on security and stability of power system in a simple and effective way.  Method  This paper proposed the “with or without contrast” idea and studied the influence of various factors on system stability， and gave a pragmatic method based on this idea.  Result  This paper studies voltage instability of the Pearl River Delta power grid by adopting the new method proposed . The results show that both the transient characteristics of motor load and conventional HVDC have a significant impact on the stability of the system. In contrast， motor load have a more fundamental effect on system stability.The negative impact of conventional HVDC transient reactive power characteristics on system stability is apparent only in certain scenarios.  Conclusion  The case study shows that the method proposed in this paper can quickly and efficiently evaluate the influence of various factors on security and stability of the system， deepen our understanding of stability mechanisms of power grid， and can get conclusions that traditional methods can not draw. The ideas and methods proposed in this paper can provide useful reference for the industry to undertake similar researches.