| With the depletion of fossil fuels, the use of renewable energy has increasingly become the focus of our country. Pumped-storage power station has played an important role in peaking and valley-filling, frequency adjusting, power load tracking etc. The structure and working conditions of the pumped-storage unit is complex, and it can’t start directly in pumping conditions. Therefore, it is a difficult problem in the starting method and protection configuration.Firstly, this paper has introduced the common starting method of pumped-storage unit, focused on analysis of the operation principle of the static frequency converter system. Using the rotor position to replace the voltage information, it has simplified and improved the control strategy of the inverter side during the natural commutation stage. It has analyzed the reason of starting failure during different condition of pumped-storage and the importance of static frequency converter starting in pumped-storage power station. According to the DC motor speed control system, it has analyzed the parameters of the rectifier control system, and derived mathematical model of synchronous motor. Comparing the simulation, it has improved the strategy of the double-loop control system, that it has been used in the intermittent commutation stage. Completed the model of SFC by using Matlab/Simulink, and analyzed the influence of variable frequency starting process. The frequency of synchronous motor current is variable during the start-up, this paper has proposed a method, that amplitude differential protection, to solve the problem when open fault occurs. Meanwhile, it has described the operating conditions of pumped-storage units, as well as converted between various working conditions. According to the main electrical scheme of the pumped-storage power station, it has analyzed the use of the system protection configuration... |
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