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Two-phase STATCOM (Static Synchronous Compensator) management device on traction side of electrified railway, and control method of device

A technology for electrified railways and control methods, applied in flexible AC power transmission systems, reactive power adjustment/elimination/compensation, etc., can solve problems that hinder the effective and smooth progress of power quality control in power systems, large installation and maintenance workloads, and economic costs. Increase and other problems, to achieve the effect of reducing governance cost and operation and maintenance workload, novel control strategy, and obvious compensation effect

Active Publication Date: 2014-09-03
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of comprehensive management according to a unified physical model, there are often situations where one loses sight of another, resulting in increased economic costs, heavy installation and maintenance workload, and other shortcomings, hindering the effective and smooth progress of power quality management in power systems

Method used

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  • Two-phase STATCOM (Static Synchronous Compensator) management device on traction side of electrified railway, and control method of device
  • Two-phase STATCOM (Static Synchronous Compensator) management device on traction side of electrified railway, and control method of device
  • Two-phase STATCOM (Static Synchronous Compensator) management device on traction side of electrified railway, and control method of device

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing and example.

[0021] Such as figure 1 As shown, the voltage level of the system side is 110kV, and the minimum short-circuit capacity is 450MVA. Adopt V / V wiring traction transformer 110 / 27.5kV, the impedance voltage is 8.4%, and the installed capacity is 2×40MVA. There is a train of locomotives running on the left and right power supply arms respectively. Because the loads of the two power supply arms are seriously unbalanced, if the power quality control device is not used, a high-amplitude negative sequence current will be generated on the system side, which will seriously affect the safe operation of the system.

[0022] The STATCOM device is installed between the two-phase power supply arms on the secondary side of the traction transformer, including the converter equipment and the control system. The converter equipment includes two voltage source converters, which f...

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Abstract

The invention discloses a two-phase STATCOM (Static Synchronous Compensator) management device on a traction side of an electrified railway, and a control method of the device. The device is connected with a two-phase power supply arms on a secondary side of a traction transformer in parallel, and comprises converter equipment and a control system. The converter equipment comprises two single-phase full-bridge inverters with a back-to-back structure form, and two groups of passive filters, wherein the transfer of active power between the two power supply arms can be realized through the control on capacitor voltage on a shared direct current side, and thus the load of two phases can be balanced; the two groups of passive filters are used for compensating harmonic wave and reactive power. The control system comprises a data acquisition system, a master control system, a PWM (Pulse-Width Modulation) signal generation system and a thyristor driving system. The device is arranged on a low-voltage side, so that the capacity demand of the device is reduced, the cost of the device is lowered, and the reliability of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of power system power quality control and treatment, and in particular relates to a static var generator-based power quality comprehensive treatment device and a control method thereof. Background technique [0002] As the main artery of the national economy, the country's important infrastructure and popular means of transportation, railways play an irreplaceable role in various undertakings of my country's economic and social development. With the rapid development of electrified railways, the advent of the era of high-speed railways will inevitably have a negative impact on the operation of the power system. Electrified railway traction load is a special load that moves, has large amplitude changes, and is frequent. It is a typical daily fluctuating load with short-term impact and unbalanced characteristics. Because it injects a large amount of negative sequence current into the grid and causes three-phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/16Y02E40/10
Inventor 袁晓冬李群徐青山陈兵孙蓉
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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