Intelligent high-reliability low-voltage power supply and distribution system based on radial wiring and method thereof

Abstract

The invention discloses an intelligent high-reliability low-voltage power supply and distribution system based on radial wiring and a method thereof. The intelligent high-reliability low-voltage powersupply and distribution system comprises main station equipment between a power supply bus and a load bus and N regional station equipment between the load bus and a load. The low-voltage power supply and distribution system with radial wiring is high in reliability and high in intelligence, a main station multifunctional power supply adopts a main power supply mode, power supply in the system isseamlessly switched to a main station diesel generator, and power failure dead time does not exist; the main station multifunctional power supply performs harmonic and reactive dynamic tracking compensation functions on a load access point, and harmonic waves generated in the system cannot enter a power grid through a power supply bus access point to cause pollution. When any load branch in the system breaks down, the whole system does not need to be powered off, a fault area controller and an area multifunctional power supply are matched with each other to achieve trial starting, attempt fault self-healing in an area and display faults on a main station human-computer interface, the troubleshooting process is simplified, and the troubleshooting workload is reduced.

Description

technical field [0001] The invention relates to the technical field of power supply and distribution, in particular, it is suitable for industrial construction sites, power plant auxiliary equipment, coal mines, steel, petrochemical, chemical fiber, chip manufacturing, etc., where the load areas are dispersed, and field equipment and instruments have high requirements for power supply and distribution quality. Applications. Specifically, it is an intelligent high-reliability low-voltage power supply and distribution system and its method based on radial wiring. Background technique [0002] At present, low-voltage power supply and distribution lines have basic wiring methods such as radial, branch and ring. Radial wiring, based on independent loads or centralized loads, is powered by separate distribution lines. Its characteristic is that it does not affect each other when the lead-out line fails. It is generally used in a single device with large capacity, relatively conce...

AI Technical Summary

Problems solved by technology

[0006] Intelligent microcomputer relay protection devices are widely used in power generation, transmission, and transformation links, but they are rarely used in power supply and distribution links, resulting in the original backwardness of low-voltage power supply and distribution systems

Thermal magnetic tripping circuit breakers and fuses are commonly used in conventional power supply and distribution systems, especially in low-voltage power distribution links. When any load branch fails, the entire system needs to be powered off, and the troubleshooting process is complicated and the workload is heavy.

[0007] Due to the reactive power loss caused by power lines and loads, the voltage on the load side is too low. Often the best solution is on-site compensation. However, the capacitance compensation used in conventional on-site compensation is bulky and can only be fixed-value compensation, which lacks flexibility. And the operation and maintenance period is short

When there is a high-power motor load starting process, it will cause a sudden change in reactive power loss, which will greatly reduce the system voltage

If corresponding measures are not taken during normal operation or when the AC motor is directly started, the reactive power consumed by the equipment will cause a large voltage deviation in the voltage of the distribution bus connected to the motor, which will directly affect other utilities connected to the distribution bus. The normal operation of electrical equipment may also trigger over-voltage and under-voltage protection actions, resulting in harmful tripping of the equipment; at the same time, excessive starting surge current will cause the motor winding to heat up, thereby accelerating insulation aging and affecting the life of the motor.

Images