Integrated gate commutated thyristor based high-power pumped storage unit starting system

Abstract

The invention relates to an integrated gate commutated thyristor based high-power pumped storage unit starting system, and relates to the technical field of pumped storage units. The technical problems that the system structure is simplified, the harmonic content and reactive impact are reduced, and the efficiency is improved are solved. The system comprises a power grid, a synchronous motor, a static frequency conversion device, an excitation device and an on-grid switch, wherein the static frequency converter device comprises a filter, a step-up transformer, three frequency-converison-side thyristor power units and three step-down transformers, and the excitation device comprises an excitation-side transformer and an excitation-side thyristor power unit; and the armature winding of the synchronous motor is connected with the power grid through the on-grid switch, and is sequentially connected to the power grid through the static frequency converter device, a grid-side vacuum switch and a power-grid side mutual inductor, and the excitation winding of the synchronous motor is sequentially connected to the power grid through the excitation device, an excitation-side vacuum switch and an excitation-side mutual inductor. The system provided by the invention has good a torque characteristic, and can improve the on-grid success rate of the unit.

Description

technical field [0001] The invention relates to the technology of a pumped energy storage unit, in particular to a technology of a high-power pumped energy storage unit starting system based on an integrated gate commutating thyristor. Background technique [0002] With the improvement of industrial power consumption and the vigorous construction of new energy power generation, people's demand for peak-shaving pumped storage power stations is becoming more and more urgent. The pumped storage power station can operate as a generator when the power grid is at a peak load, providing electric energy to the power grid; when the power grid is at a low load, it can run as a motor, drive a water pump, and pump water from the downstream reservoir back to the upstream reservoir, converting the electrical energy into potential energy to as a spare. The pumped storage power station can perform multiple functions such as peak regulation and valley filling, frequency regulation, phase re...

AI Technical Summary

Problems solved by technology

In the prior art, the SFC (static frequency conversion device) used for starting the water pump of most pumped storage units uses the traditional thyristor frequency conversion device. Due to the characteristics of the thyristor device and circuit topology defects, it has a complex structure, Disadvantages such as large loss, slow start-up time, high harmonic content, and large reactive power impact will have adverse effects on the grid and motors

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