Study On Electronic Dynamic Simulation For Power System

Power system simulation has played an important role in the development of power system. It's an effective method to anlayze power system characteristics and faults on the grid. A series of corresponding researches at home and abroad were carried out. According to the testing requirements of digital protection and secondary equipment, a new real-time micro-dynamic physical simulation means for power system is proposed, which is based on electronic technology, utilizes modern analytical methods and technical measures. Theoretical research and practical exploration was done about this new physical simulation means. The detailed research works include the following aspects:(1) A wide range of domestic and international research was done about power system simulation. So the advantages and disadvantages of various simulation techniques, even scope of application were summarized, from off-line simulation and real-time simulation two aspects.(2) With the popular of digital transducers, electronic micro-dynamic simulation system was proposed. The system is composed of electronic intelligence components. The external response of this system is consistant with the actual power system. Digital simulation is the core of electronic simulation system, but the system is present in the form of physical simulation. So electronic micro-dynamic simulation system was realized by both physical methods and numerical methods.(3) According to the mathematical models, discrete-time equivalent dynamic model was built for synchronous generator, which is suitable for electronic simulation. The model takes damping windings and the rotor mechanical properties into account. The discrete-time equivalent dynamic model was realized in Matlab, and the feasibility of real-time simulation algorithm was demonstrated through no-load simulation, load simulation and and short-circuit simulation.(4) According to the characteristic of distributed parameter transmission lines, electronic simulation principles for single-phase line, three-phase low-loss transmission lines and three-phase frequency-dependent transmission lines were put forward.The technology builds the equivalent circuit of transmission lines based on the mathematical model of electromagnetic interaction between conductors. In the model, those components of which values can be determined by the history record of sampled quantities are simulated by digital signal processors.Those components of which values are independent on history record of sampled quantities and reflect the relationship of instantaneous voltage and current are realized by themselves.The real-time simulation model of transmission lines were built in Matlab, and the effeciveness of the algorithm were proved through no-load simulation and short-circuit simulation.(5) Implementation of transmission line electronic simulation device. Based on electronic simulation principle of transmission line, the hardware and software for transmission line simulation device was developed. The discussion was made around real-time and accuracy performaces. The test environment was bulit for typical items test. Compared with ATP simulation results, electronic simulation device of transmission line is proved to be a very effective means for power system characteristics analysis and power system fault research.The researches and results above show that the electronic dymamic simulation for power system is expected to become an important branch for power system dynamic simulation technology.It establishs the foundation for further exploration of power system simulation methods with space effciency, low investment and convenient operation.