Application of the equal area rule in ferroresonance analysis

• Published in: Dianli Xitong Baohu yu Kongzhi Vol. 39; no. 7; pp. 26 - 31
• Main Authors: Du, Zheng-Wang, Zhou, Hai-Quan, Ha, Heng-Xu, Hu, Xi-Tong, Zhong, Chong-Shan
• Format: Journal Article
• Language: Chinese
• Published: 01.04.2011
• Subjects: Ferroresonance; Law; Mathematical analysis; Mathematical models; Networks; Stability; Transformations; Vectors (mathematics)
• ISSN: 1674-3415

The operating experience of power system shows that the ferroresonance often takes place in the neutral ungrounded system, which severely impacts the security, stability and reliability of the system. For the sake of efficiently analyzing the increasing ferroresonance phenomena in the distribution network, the paper uses phase-mode transformation to transform the distribution network to a zero-mode network, and establishes a mathematical model of the zero-mode network. After introducing the concept of time-dependent vector, the paper establishes the time-dependent vector mathematical model, based on which, three balance points of the system are discussed. Equal area law is established to be applied to the analysis of the ferroresonance circuit in a novel manner accompanying the definition of stability margin and the calculation formula of disturbing quantity, at the same time the close relationship between the happening of ferroresonance and fault time is investigated. The analysis method of ferroresonance is