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Power System Dynamic Voltage Stability Simulation Study Based on Precise Integration Method

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Tutor: LiZhiMin
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: power systems,time-domain simulation,Precise Integration Method,dynamic voltage
CLC: TM712
Type: Master's thesis
Year:  2008
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Abstract:
During the last decades,a series of blackouts relating to the voltage problem have happened in the whole world. The issue brought extensive concern around the electric power engineering and academic circles. Voltage stability problem become one of the important subjects in modern power system research. As the development of research, people realize the nonlinearity of power system gradually; stability problem belongs to a dynamic category. It is very important to find a suitable method for time domain simulation which is the most effective method in researching power system dynamic voltage.Precise Integration Method is a highly precision method to solve differential equation under Hamilton system which presented by academician of Zhong Wanxie. This method, which based on 2N classification arithmetic, spurned difference scheme in traditional solution of dynamic equations. This paper proposes Precise Integration Method in voltage simulation, considering the affection of dynamic equipments.Affection of dynamic devices including generation, excitation system, MXL, OLTC, dynamic resistance load and induction-motor to dynamic voltage stability is studied based on Precise Integration Method for the single generation system. Precise integration formats for dynamic voltage stability is deduced considering the state equations of system and precise integration format.The performance of Precise Integration Method and Runge-Kutta method on precision, speed and numerical stability is compared with different simulation steps. Conclusion: on precision the two methods is similar, and the simulation speed of Precise Integration Method is superiority to Runge-Kutta method, while on the side of numerical stability, the former one is inferior to the later one. In all, Precise Integration Method is proved to be suit for the dynamic voltage stability simulation.The precise integration formats for dynamic voltage stability are investigated. It is found that precise integration format is not unique, while different format directly impacts on the results of simulation. The essence principle of Matrix H format for dynamic voltage stability is proposed: reduced the effect of non-linear item on the premise that matrix H is full rank.
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