Variable-frequency speed regulating system for starting high-power pumped storage unit

Abstract

The invention relates to a variable-frequency speed regulating system for starting a high-power pumped storage unit in the technical field of water pumps, comprising a static frequency converter (SFC), an input circuit breaker, an output circuit breaker, a grid-connected switch, an excitation device, wherein a power grid is connected with the input circuit breaker sequentially connected with the static frequency converter, the output circuit breaker and the excitation device, the excitation device is connected with the grid-connected switch, and the other end of the grid-connected switch is connected to a circuit between the power grid and the input circuit breaker. The static frequency converter is a high-voltage frequency converter formed by connecting in series and stacking power units of an insulated gate bipolar transistor (IGBT). The static frequency converter of the variable-frequency speed regulating system has the characteristics of concise system structure, convenient maintenance, rapid response, accurate control, less harmonic content, reliable running, high efficiency and low reactive power impact.

Description

technical field [0001] The invention relates to a speed regulation system in the technical field of water pumps, in particular to a frequency conversion speed regulation system for starting a large-power pumped storage unit. Background technique [0002] With the continuous improvement of social power consumption level and the vigorous construction of nuclear power and wind power, the pumped storage power station, with its unique operation mode of electric power and power generation, has become an important part of power grid peak and valley filling, frequency modulation, phase modulation, emergency backup and black start. It plays an important role in ensuring the safe and high-quality operation of the power grid and improving the economy of the system. At the same time, the reasonable and effective use of pumped storage power stations can reduce the construction of conventional thermal power peak-shaving power sources and the emission of pollutant gases from thermal power ...

AI Technical Summary

Problems solved by technology

As far as the SFC (static frequency conversion device) system started by the water pump of the pumped storage unit is concerned, the traditional thyristor frequency conversion device is used in the pumped storage power station. Due to the characteristics of the thyristor device and the defects of the circuit topology, It has disadvantages such as complex structure, large loss, low reliability, slow start-up time, high harmonic content, and large reactive power impact, which will have adverse effects on the power grid and motors

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