NOUFERROUS METALLURGICAL EQUIPMENT

When high-power motors are connected to an isolated power grid, soft starting, frequency converters, etc. are generally used to improve the starting performance of the motor and the stability of the power supply. At the same time, reactive power compensation devices are installed to improve the power factor of the power supply system and reduce line losses. However, if the selection of soft start or frequency converter is improper, or the reactive power compensation configuration is unreasonable, voltage fluctuations, power oscillations and power supply quality decreased, and even safety issues may occur. The article takes the power supply system of a certain water supply pumping station as the research object. Firstly, the power supply system of the pumping station is introduced, followed by an analysis of the electrical faults that occurred during the commissioning process of the pumping station. Then, the optimization of the high-power motor starting scheme and the setting of the reactive power compensation device in the isolated power grid are discussed. Based on the actual situation of the project, it is proposed to organically combine the solid-state soft starter with the real-time reactive power compensation system. The use of a suitable capacity real-time reactive power compensation system can reduce the starting current of the high-power motor and the voltage drop of the power grid, which can effectively solve the problem of poor power quality during the startup of the high-power motor in the distribution system of the isolated power station. At the same time, several alternative solutions for the power supply system of the pumping station are also proposed for reference. Finally, several suggestions are given.