Study On Intelligent Adaptive Control For Operating Of Vacuum Switch

With the development of the vacuum switch technology and the proposal of environment protection, such as "low-carbon technology", vacuum circuit breakers have been widely used in power system and other engineering. How to improve the performance and intelligence of vacuum circuit breakers and to achieve synchronous switching, making vacuum circuit breakers more widely used in power system, have been the research focus in Electrical engineering. The force output characteristic of Permanent magnetic actuator (PMA) which appears recently can be good match to the load characteristic of vacuum interrupter. And PMA has high reliability and controllability. It is the necessary hardware foundation for the intelligence of vacuum circuit breakers.The intelligent control of vacuum circuit breakers with PMA is important to improve the performance and intelligence of vacuum circuit breakers and to achieve phase-control switching in power system, and it is an advanced topic in the intelligent apparatus and smart grid. This paper studies the intelligent adaptive control of vacuum circuit breakers with PMA, mainly focusing on the requirement of phase-control switching in power system, to achieve stable operating time and high controllability for vacuum circuit breakers. It can promote the realization of phase-control switching in power system and improve the intelligence of circuit breakers.For achieving the intelligent control of vacuum circuit breakers with PMA, firstly, analyze the operating principle and dynamic model of PMA, studies the matching between PMA and vacuum interrupter, determine the method to control vacuum circuit breakers with PMA. Secondly, according to the analysis of dynamic model of vacuum circuit breakers with PMA, studies the intelligent control of its operating. And have proposed adaptive real-time feedback control for the travel of switches, based on the compensation of major environmental factors (capacitor voltage and ambient temperature). This method not only can achieve stable operating time for vacuum circuit breakers, but also make the travel of switches can be controlled. And fuzzy self-adaptive PID control is used in this method. Lastly, according to the requirement of the intelligent control and the projects, designs the intelligent control system for vacuum circuit breakers with PMA. Then debugs the system and makes some experiments to prove its feasibility and effectiveness.This paper uses DSP to design the intelligent control system, and uses IGBT power electronic H-type drive circuit to drive switches. Its control mode can be more flexible and control accuracy can be higher. According to the requirement of the projects about synchronous vacuum switching with PMA, uses the intelligent control system to do the experiments on adaptive control for operating time of switches. According to the results of experiments, the intelligent control system can make the original making time 29.3ms-38.3ms improve to 33.5ms-34ms under different environmental conditions (the target time is 33.75ms). The system can keep the making time error within±0.25ms under different environmental conditions.