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

Abstract

The invention discloses a reactive power compensation method for a distance and multi-load node linear power supply system. 1. When designing a long-distance and multi-load node linear power supply system, reasonably determine the arrangement positions of a central switch station and a contact switch station; The contact switch station is arranged in the middle of two adjacent central switch stations; 2. Calculate the length of overhead lines and cable lines between each central switch station and the adjacent contact switch station, and calculate the electrical current of the line-to-ground capacitive current The center position, set up a circuit breaker station at the electrical center position; 3. Perform reactive power compensation in accordance with the principle of combining centralized compensation and decentralized compensation. The invention has the advantages of greatly improving the phenomenon of relatively low power factor, and the economic benefit is remarkable.

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] Long-distance, multi-load node linear power supply system is widely used in long-distance large-scale water transfer projects, highways, high-speed rail, urban subway tunnels and other projects. Its characteristic is that there are many load nodes along the line (along the power supply line). 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 e...

AI Technical Summary

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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