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Electric power quality control system and method for metro power supply system

A power supply system and power quality technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as the comprehensive management of harmonics and reactive power in the subway power supply system

Active Publication Date: 2016-04-13
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the present invention proposes a power quality control system and method for a subway power supply system, which can solve the technical problem that the harmonics and reactive power in the subway power supply system cannot be comprehensively managed in the prior art

Method used

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  • Electric power quality control system and method for metro power supply system
  • Electric power quality control system and method for metro power supply system
  • Electric power quality control system and method for metro power supply system

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Embodiment 1

[0058] Such as figure 1 As shown, this embodiment provides a power quality control system for a subway power supply system, which may include:

[0059] acquisition device ( figure 1 not shown), for collecting the voltage and current of the high-voltage side and the low-voltage side.

[0060] As a specific implementation, the acquisition device may specifically include: a high-voltage acquisition unit, configured to acquire the three-phase voltage u of the high-voltage side a1 , u b1 , u c1 and three-phase current i a1 i b1 i c1 ;Low-voltage acquisition unit, used to acquire the three-phase voltage u of the low-voltage side load a2 , u b2 , u c2 and three-phase current i a2 i b2 i c2 . Among them, the voltage signal and current signal are collected synchronously. Both the high-voltage acquisition unit and the low-voltage acquisition unit can realize the required voltage and current acquisition through voltage sensors and current sensors.

[0061] The active filte...

Embodiment 2

[0110] Such as Figure 5 As shown, the present embodiment provides a power quality control method for a subway power supply system, which may include the following steps:

[0111] S1: Obtain the voltage and current of the high-voltage side and the low-voltage side. This step may specifically include: obtaining the three-phase voltage u of the high voltage side a1 , u b1 , u c1 and three-phase current i a1 i b1 i c1 ; Get the three-phase voltage u of the low-voltage side load a2 , u b2 , u c2 and three-phase current i a2 i b2 i c2 ; Among them, the voltage signal and the current signal are collected synchronously.

[0112] S2: Calculate the harmonic current compensation value and reactive current compensation value according to the obtained voltage and current, and the harmonic current compensation value is equal to the opposite number of the sum of the harmonic current component on the high voltage side and the harmonic current component on the low voltage side , ...

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Abstract

The invention provides an electric power quality control system and method for a metro power supply system. The electric power quality control system comprises a collection device, an active filter and a monitoring device, wherein the collection device is used for collecting voltages and currents of a high-voltage side and a low-voltage side; the active filter is used for calculating a harmonic current compensation value and a reactive current compensation value according to the collected voltages and currents; the harmonic current compensation value is equal to an opposite number of the sum of a harmonic current component at the high-voltage side and the harmonic current component at the low-voltage side; the reactive current compensation value is equal to the opposite number of the sum of a reactive current component at the high-voltage side and the reactive current component at the low-voltage side; and the monitoring device is used for determining the working mode of the active filter according to the harmonic current compensation value, the reactive current compensation value and the rated capacity of the active filter, and is also used for generating a current compensation instruction according to the working mode, the harmonic current compensation value and the reactive current value of the active filter and transmitting the current compensation instruction to the active filter.

Description

technical field [0001] The invention relates to the field of electric energy quality control and management of electric power systems, in particular to a power quality control system and method for a subway power supply system. Background technique [0002] With the continuous expansion of my country's cities, people travel frequently, the traffic demand has increased sharply, and the contradiction between urban traffic supply and demand has become increasingly tense, and ground traffic has been unable to meet the current traffic demand. As one of the most economical and efficient urban transportation tools in the world, the subway has developed rapidly in our large and medium-sized cities. [0003] my country's subway power supply system is mainly composed of main substation, traction substation, rectification system and power lighting system. Due to the large fluctuation of the traction load in the subway power supply system and the cable connection of the subway power su...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1821Y02E40/30Y02E40/40
Inventor 王海涛李国玉撖奥洋王德涛张永祥
Owner STATE GRID SHANDONG ELECTRIC POWER
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