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

  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.