Design Of SVC Cotroller Based On Dual Processor And Control Of Its10kV Grid-connection

Electric power is the most important form of energy, and the electric power industry is a fundamental industry for the national economic development and social progress. A country’s electrification level has become an important mark to measure its level of modernization.The electricity grid structure of China is originally weak, and many badly-impactive loads (such as AC electrical arc furnaces, rolling mills and welding machines) lead to voltage fluctuations and flicker, voltage and current waveform distortion, lower power factor and an imbalance of three-phase power supply, which will lower the power quality, increase the power dissipation and reduce the energy efficiency. For these reasons, there is so much work to do to meet the21st century industries and people’s lives’demand for electricity. Therefore, it is necessary to take some measures to deal with these issues, for example, the static var compensator (SVC) is able to solve these problems. So it is very important to design a quick-response and stable SVC. Under this background, in this thesis a SVC (composed of TCR+FC) control system for1OkV AC electrical arc furnace is developed and the control model for SVC grid-connection is in-depth study.First of all, the compensation of SVC (composed of TCR+FC) to unbalanced triphase load is reserched. On this basis, an overall design scheme of the SVC control system based on MCU+DSP dual-processor tructure is proposed. According to the functional requirements of the SVC control system, the overall functional design of the master control module, the data processing module, the PC monitoring module and the communication system is carried through.Sencondly, the dardware design to the master control module of the SVC control system is done, with80C196KC as the main microprocessor, and the final PCB is welded and debugged, and the results prove that the hardware works well. Based on the hardware, the workflow of the SVC controller is described, and the master control module is divided into several function modules, whose program flow is also designed. Then, all the bottom hardware drivers are programmed. At the meantime, some program is written to realize a variety of system operation, and the running results show that the software design idea is correct, but still needs further refinement.At the end of this thesis, based on the in-depth study of the control model for SVC grid-connection, an unbalance control method for SVC is proposed, in which the compensating admittance provides feedback in the close-loop structure. Using the designed regulator, this control method is simulated in Simulink, and the results show that the control effect is good.