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Stabilizing control of variable impedance power systems: Applications to variable series capacitor systems
Author(s) -
Okamoto Hiroshi,
Yokoyama Akihiko,
Sekine Yasuji
Publication year - 1993
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391130409
Subject(s) - electric power system , power electronics , control theory (sociology) , transient (computer programming) , capacitor , engineering , control engineering , stability (learning theory) , control system , power (physics) , computer science , control (management) , electrical engineering , voltage , physics , quantum mechanics , artificial intelligence , machine learning , operating system
In future electric power systems, it will be very important to utilize existing ac networks more effectively with the help of power electronics technology. It has become clear that various types of apparatus utilizing such power electronics technologies as variable series capacitors (VSrC) and high‐speed phase shifters (HSPS) can improve transient stability and damping in one‐machine, infinite‐bus power systems. This paper presents a novel control scheme for variable impedance apparatus such as VSrC and HSPS devices in multi‐machine power systems. First, this paper describes a comprehensive approach for control design of VSrC and HSPS apparatus. The proposed control scheme is based on the energy function of multi‐machine power systems. The controllers are designed so that the time derivative of the energy function has a smaller negative value than that without controllers. In this sense, the present method assures the improvement of first‐swing stability and damping. Next, the proposed control scheme is applied to VSrC apparatus. Digital simulations and eigenvalue analysis are conducted for a three‐machine loop system and a five‐machine radial system to demonstrate the effectiveness of the proposed method. The results make it clear that the proposed controllers for VSrC can significantly improve both the transient stability and the steady‐state stability of power systems.