An intensive DC ice-melting system for 500kv substation with svg function

Abstract

The invention discloses a 500kV substation intensive DC ice-melting system with SVG function, which includes electric energy measurement and protection device, transformer, operation mode switcher, DC ice-melting unit and dynamic reactive power compensation unit. The primary side is connected to the AC bus of the substation through an electric energy measurement and protection device, and the secondary side of the transformer is connected to a DC ice-melting unit and a dynamic reactive power compensation unit through an operation mode switcher. The invention can realize the recovery and utilization of the heat loss of the device itself, is compatible with the dispatching AVC system of the substation, provides effective guidance for the research on the multifunctional topology of the ice melting device and the development of the device, and is widely applicable to 500kV substations.

Description

technical field [0001] The invention relates to an ice-melting device for electrical engineering, in particular to an intensive DC ice-melting system for a 500kV substation with SVG functions. Background technique [0002] Ice and snow disasters occur frequently in southern regions such as Guizhou, Hunan, and Hubei in China. Due to abnormal climate changes in recent years and even northern regions such as Beijing and Liaoning, ice and snow disasters also occur from time to time. After the transmission line is covered with ice, it is easy to cause tower collapse and disconnection, which seriously threatens the power grid. Safe and stable operation and power supply reliability. In order to improve the ability of transmission lines to resist ice disasters, many domestic units have developed various types of DC ice-melting devices, which provide a solid technical guarantee for the safe and stable operation of the power grid in winter, but the ice-melting devices are only used du...

AI Technical Summary

Problems solved by technology

However, this type of device has the following technical problems: Problem 1, large harmonics, large footprint: when the device is running, it will generate a large number of 5th and 7th harmonic currents, and the device itself and the filter need to be equipped with multiple sets of large-capacity capacitors, Reactor, resulting in a large area of ​​the device and high construction costs; problem 2, ice melting and reactive power compensation must be configured with the same capacity: the overall capacity should take into account both the SVG and the ice melting device, the voltage is the high voltage of the SVG, and the current is the ice melting device The high current leads to a very large overall capacity and high cost; problem 3, the heat generation is large, and water cooling must be used: this method has large losses and high operating costs, so water cooling must be used, and a water cooling system must be added. The water quality requirements are high, and deionization is required At the same time, it is necessary to prevent water leakage, and antifreeze treatment is required in winter, and the maintenance workload is heavy, which affects the reliability of the device

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