Analyse And Control Strategy Of STATCOM In Power Distribution Systems

With the development and constant improvement of the industrial automation level of the Hi-Tech industry, the power customers are more and more sensitive to the power supply quality and dependability . At the same time, utilizing limited electric energy to reach the greatest economic benefits in industrial production, saving energy becomes an eternal topic . The STATCOM that this paper discusses is suitable for the distribution system and it controls the reactive power of the low-voltage distribution system to achieve the purpose to improve the power factor , reduce the line loss , economize the electric energy.At first the paper mainly introduces the development of FACTS technology, the development at home and abroad of STATCOM, STATCOM development prospect in the distribution network and some relevant concepts of reactive power compensation; Then the paper go on in detail describing around construction of experimental system of STATCOM; Finally it verifies with the experiments that STATCOM has the functions: compensating the reactive power according to load change among distribution system, improving the power factor, stabilizing the voltage of distribution system.In the design of the main circuit of STATCOM based on IGBT-IPM, the selection of the main circuit parameters and the design of snubber circuit are detailed and analyzed. Then the fact working mechanism of STATCOM and his control strategy are discussed on the basis of main circuit structured. Finally the reactive power closed-loop control strategy is proposed and can be verified its feasibility in the experiment later.In the design of double-CPU control system based on ADMC401 and 80C196KC, ADMC401 carry on data gather, software filter, instantaneous reactive power calculation, PI control and regulation, generation of SPWM signal for driving IGBT-IPM. 80C196KC mainly finishes the keyboard controls, LCD display , data keeping , signal conveying and so on. Other...