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Electric energy quality controller for traction transformer station

A traction substation, power quality technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of system instability, high grid voltage, high cost, reduce total capacity, excellent compensation performance, eliminate The effect of negative sequence current

Inactive Publication Date: 2004-11-10
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the grid voltage is high, and the grid capacity is large, so the capacity of the compensation device is very large, the cost is high, and it is technically difficult to implement
[0016] (1) The interaction between the two power supply arms is ignored. If active devices with fast dynamic response are used, the system may be unstable
[0017] (2) It is not easy to make the two arms reach the load balance state, and it is difficult to compensate the negative sequence current

Method used

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  • Electric energy quality controller for traction transformer station
  • Electric energy quality controller for traction transformer station
  • Electric energy quality controller for traction transformer station

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Embodiment

[0034] The embodiment of the present invention provides a test prototype of a power quality controller, and its main technical indicators are: (1) The power supply voltage is 220V / 50Hz, and the short-circuit capacity is 770KVA. (2) The three-phase converter consists of a voltage type inverter with a capacity of 10kVA. The isolation transformer is a Scott transformer with a capacity of 3kVA. (3) In the test device, the capacity of the balance transformer is 3kVA, the three-phase line voltage on the primary side of the transformer is 220V, and the two-phase voltage on the secondary side is 110V respectively. The load is a diode rectified load filtered by a smoothing reactor, which can simulate a traction load.

[0035] Actual operation results and simulation results show that the power quality controller proposed by the present invention can effectively compensate the harmonics, reactive power and negative sequence current in the traction grid, and the filtering effect of the f...

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Abstract

The invention is an energy quality controller for a traction power substation, composed of a three-phase converter and a Scott transformer, two orthogonal single-phase output power supplies are connected with two single-phase output ends of the Scott transformer, respectively, the three-phase converter connects in series with a three-phase output end of the Scott transformer, where the three-phase converter is an inverter with capacitor in parallel with the DC bus. It controls two power supply arms of the traction transformer at the same time and can effectively compensate harmonics in drawing electric network, reactive power and negative sequence current.

Description

technical field [0001] The invention relates to a power quality controller in a traction substation, belonging to the field of electrical equipment. Background technique [0002] The load of the electrified railway power supply system is an electric locomotive. Due to the high power of the locomotive and frequent changes in speed and load conditions, the traction grid has the characteristics of low power factor, high harmonic content, and large negative sequence current. The equipment in the power grid and along the railway has also brought serious harm, and measures must be taken to control it. [0003] The main methods currently used to improve the power quality of the traction grid are: [0004] (1) Use passive filter banks to compensate harmonics, and use parallel capacitor banks to compensate reactive power and improve power factor. [0005] This is a traditional method with mature technology, high reliability and low cost, but it cannot flexibly change the compensati...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 姜新建孙卓朱东起
Owner TSINGHUA UNIV
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