Researches On Exciter Of Synchronous Generator And User Defined Exciter Models Based On PSASP

With development of science and technology and modernization of production, all departments of the national economy are developing in the direction of high-speed and automation, which demands power supply of higher quality. Power quality and system reliability are greatly influenced by performance of the synchronous generator excitation systems.PSASP(Power System Analysis Software Package) is a package of programs widely used in China for power system analysis and simulation. It provides rich functions for user development, including user defined models and user routine interface. Although PSASP contains a variety of excitation system models which satisfy the requirement for the vast majority of excitation systems, situations may arise in which there is no library model for a given new excitation system. This thesis focuses on development of user defined models for power system stability studies in PSASP. The main work is as follows:1. Characteristics and performances of different types of excitation systems are analyzed. Modeling and parameters of typical excitation systems in China are described in detail. An introduction to some software packages for analyzing electromechanical oscillation, including PSASP, PSS/E and TOP, is made at the end of this chapter.2. Based on the IEEE recommended practice for excitation system models for power system stability studies, the excitation system models in PSS/E are studied. The IEEE standard excitation system models are tested with PSS/E, which is used for user defined exciter models in PSASP.3. The AC and ST exciters in PSASP are discussed. Due to their deficiency compared with IEEE recommended practice for excitation system models in 1992, user defined exciter models for power system stability analysis based on PSASP are developed including the AC1A~AC2A/ST1A~ST3A excitation systems. At the same time, performances of the high initial response excitation system and themaximum/minimum excitation limiter are studied and compared.4. The user defined excitation system models in PSASP are examined by simulations carried out on SMIB system and EPRI 8 machines and 36 buses system, respectively. Comparison between the simulation results obtained in PSS/E and PSASP shows that the user defined excitation system models in PSASP have satisfactory accuracy and can be applied to practical analysis.