Alternating-current deicing method based on flow cell

Abstract

The invention discloses an alternating-current deicing method based on a flow cell. The alternating-current deicing method includes the following steps: the tail end of a power transmission line needing deicing is connected with a grounding system including a resistor and a sixth switch unit, a main control system calculates clinical currents for preventing the power transmission line needing deicing from being covered by ice, the main control system obtains needed deicing power, a third switch unit is closed, a switch unit connecting a high-voltage bus and the start end of the power transmission line needing deicing is closed, the sixth switch unit is closed, the main control system controls output power of a flow cell power supply system to reach the needed deicing power P, the main control system calculates needed time of deicing, and the main control system judges whether time needed by deicing is reached, and if yes, the sixth switch unit is disconnected. According to the method, the tail end of the power transmission line needing deicing is connected with the grounding system, the start end of the power transmission line needing deicing uses the flow cell power supply system in combination with a solar power supply system or a wind power supply system as a deicing alternating current power, and the alternating-current deicing method saves energy and is practical and convenient to use.

Description

technical field [0001] The invention relates to the technical field of ice melting for power transmission lines, in particular to an AC ice melting method based on a liquid flow battery. Background technique [0002] China is one of the countries with the most serious icing on transmission lines in the world. Severe icing will lead to a sharp decline in the mechanical and electrical performance of transmission lines, which will lead to icing accidents. There have been icing accidents on transmission lines in Hunan, Hubei, Guizhou, Jiangxi, Yunnan, Sichuan, Henan and Shaanxi provinces in China. Icing accidents have seriously threatened the safe operation of my country's power system and caused huge economic losses. [0003] The main hazards of wire icing are as follows: [0004] 1. Overload: The actual weight of the ice-covered conductor exceeds the design value by a lot, which leads to mechanical and electrical accidents on the overhead transmission line; [0005] 2. Accid...

AI Technical Summary

Problems solved by technology

[0004] 1. Overload: The actual weight of the ice-covered conductor exceeds the design value by a lot, which leads to mechanical and electrical accidents on the overhead transmission line;

[0005] 2. Accidents of non-uniform deicing or uneven icing: uneven icing of adjacent wires or different tensions caused by deicing in different periods will cause the wires and ground wires to slide in the clamp, and in severe cases, the outer aluminum strands of the wires will be online All the clip outlets are broken and the steel core twitches;

[0006] 3. Insulator string ice flash accident: After the insulator is covered with ice or bridged by ice, the insulation strength decreases, the leakage distance is shortened, and the local surface resistance of the insulator increases when the ice melts, forming a flashover accident. During the development of the flashover, the arc burns the insulator continuously. Cause the insulation strength of the insulator to decrease;

[0007] 4. Conductor ice-covered galloping accident: Conductor dances under the action of wind due to uneven ice coating, and the low-frequency and high-amplitude dance of ice-coated conductors causes serious accidents such as damage to hardware, broken strands of conductors, phase-to-phase short circuit, tilting or collapse of towers, etc.

[0009] Among them, the principle of AC ice-melting technology is to apply AC power to the ice-coated line as a load, and provide ice-melting current to heat the wire to melt the ice. Although it can reduce the investment, it is limited by the capacity of the generator set and the capacity required for ice melting, and most of the cases do not meet the demand; the use of system power as the ice melting power supply is limited, and the system power supply is under the condition of power grid failure and decoupling out of power, unavailable

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