Reactive compensation method for long-distance multi-load-node linear power supply system

Abstract

The invention discloses a reactive compensation method for a long-distance multi-load-node linear power supply system. The reactive compensation method comprises the steps that 1, the arrangement positions of central switching stations and contact switching stations are reasonably determined when the long-distance multi-load-node linear power supply system is designed; the contact switching stations are positioned between corresponding two adjacent central switching stations; 2, the lengths of the overhead circuits and the cable circuits between each central switching station and the adjacent contact switching station are calculated; the electrical central position of the line-to-ground capacitive current is calculated; a circuit breaker station is arranged at the electrical central position; and 3, the reactive power compensation is performed based on the principle of a combination of concentrated compensation and dispersion compensation. The reactive compensation method has the advantages that the phenomenon of relatively low power factor can be greatly reduced, and remarkable economic benefit can be achieved.

Description

Technical field [0001] The invention relates to a reactive power compensation method for a power supply system, in particular to a reactive power compensation method for a long-distance, multi-load node linear power supply system. Background technique [0002] The long-distance, multi-load node linear power supply system is widely used in long-distance and large-scale water transfer projects, highways, high-speed railways, urban subway tunnels and other projects. Its characteristic is that there are many load nodes along the line (along the power supply line). Now take the long-distance large-scale water transfer main canal as an example. There are many diversion gates, control gates, exit gates, accident inspection gates and other buildings along the line. The large number of load nodes makes the number of cables used also increase. In addition, the power supply system is a linear auxiliary device, which causes the power factor of the power supply system to be too low, resultin...

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Problems solved by technology

Taking the long-distance large-scale water diversion main canal as an example, there are many water diversion gates, control gates, water retreat gates, emergency maintenance gates and other buildings along the line, and the number of cables used increases due to the large number of load nodes. Moreover, the power supply system is linear auxiliary, so the power factor of the power supply system is too low, resulting in waste of electric energy, and the power adjustment fee levied by the power grid company also increases accordingly, which increases the operating cost of the power supply system

The power factor of the central switch station is ahead and far below the standard value, which makes it difficult to open and close the breaking equipment. When a single-phase ground fault occurs, the ground capacitor current will also increase greatly, and the arc is not easy to extinguish, causing the fault to expand. At the same time, there is harmonic pollution Power supply environment problems

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