The Research On New All-digital Static Var Compensatory Controller

The reactive power compensation is an effective method for enhancing the power system voltage stability, improving system power factor, and reducing loss of the line and power equipments. In all kinds of equipments adjusted reactive power, SVC(Static Var Compensator) has very large technical advantage.For example,it has non-mechanical action installment,and the short response time, and continuously and dynamicly regulates reactive power compensation rate and so on. SVC is developing towards the high-capacity, high-voltage direction. Application is also getting more and more widespread.Control system is essential core of SVC. To a great extent, it decides system's performance. The controller of SVC has experienced several stages from SBC(Single Board Computer), MCU(Microcontroller Unit) to DSP or IPC(Industrial Personal Computer).Former controller use massive analog devices,so they exist some questions that system debug difficulty,parameters are easy drift, control accuracy is unsatisfactory,and trigger pulse symmetry is unideal and so on.System performance is affected. Therefore, the study is necessary for all digital controller. Along with VLSI (Very Large Scale Integration) technical increasing development, the performance of FPGA(Field Programmable Gate Array) acquires vigorous promotion.It is possible that all digital controller come true by FPGA as control chip. The paper will study all digital control system for SVC based on the FPGA.The paper's main task is as follows.1) It elaborats the selected topic background and significance, reactive power compensatory system of present situation and existent question.2) It explains the dynamic reactive power compensator's basic principle, Static Var Compensator and controller's fundamental type and structure, control flow of the SVC controller's,and introduces fundamental theory of the fuzzy controllor, and fundamental method of the fuzzy PID controllor.3) It has given all digital SVC controller's designing proposal based on FPGA as control core of SVC, and introduces control principle and each functional module of realization of theory basis,and the system performance's analysis and comparison.4) It designs and realizes SVC controller's major function module and peripheral hardware circuit. The designing of SVC controller take the control center of state machine.It overcome unflexible flaw of sequential control on pure hardware digital circuit. All digital phase-locked loop(ADPLL) and fuzzy PID digital regulator are realized by FPGA,The designing fully make use of speed advantage and high-reliability for FPGA.Finally,main module function are verified through simulation and experiment.