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Three-phase balanced electrified railway power supply system of power grid

A technology of electrified railway and three-phase balance, which is applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., can solve the problems that cannot be practically applied, and there is no anti-interference circuit, so as to improve reliability, Reduce the interference of clutter and ensure the effect of safe operation

Pending Publication Date: 2019-01-18
北京中新发展清洁能源电力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the system has no anti-interference circuit and cannot be practically applied

Method used

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  • Three-phase balanced electrified railway power supply system of power grid
  • Three-phase balanced electrified railway power supply system of power grid
  • Three-phase balanced electrified railway power supply system of power grid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, a three-phase balanced power supply electrified railway power supply system for the power grid includes successively connected step-down transformers (T 1 ), high voltage rectifier circuit (U 1 ), LC 1 filter circuit (LC 1 ), HVDC inverter (U 2 ), LC 2 filter circuit (LC 2 ) and step-up transformer (T 2 ). The LC 3 The filter circuit is connected in series with the LC 1 Between filter circuit and HVDC inverter, LC 4 filter circuit with LC 2 filter circuit in series, LC 4 The output terminal of the filter circuit is used as the output terminal of the circuit. The LC 1 filter circuit (LC 1 ) includes a first reactor, the two ends of the first reactor are respectively used as the input end and the output end, the input end and the output end of the first reactor are respectively connected with a capacitor, and the other end of the capacitor is grounded, so The input end of the first reactor and the high voltage rectifier circuit (U...

Embodiment 2

[0023] Such as figure 2 As shown, the difference from Example 1 is that the LC 1 filter circuit (LC 1 ) and LC 2 filter circuit (LC 2 ), the LC 1 filter circuit (LC 1 ) includes a third reactor, the two ends of the third reactor are respectively used as the input end and the output end, the input end of the third reactor is connected with a capacitor, the other end of the capacitor is grounded, and the third reactance The input terminal of the device and the high voltage rectifier circuit (U 1 ) is connected to the output end of the third reactor, and the output end of the third reactor is connected to the high voltage DC inverter (U 2 ) connected to the input. The LC 2 filter circuit (LC 2 ) includes a fourth reactor, the two ends of the fourth reactor serve as the input end and the output end respectively, the output end of the fourth reactor is connected with a capacitor, and the other end of the capacitor is grounded. The input terminal of the fourth reactor is ...

Embodiment 3

[0025] Such as image 3 As shown, a three-phase balanced power supply electrified railway power supply system for the power grid includes successively connected step-down transformers (T 1 ), high voltage rectifier circuit (U 1 ), LC 1 filter circuit (LC 1 ), LC 3 filter circuit (LC 3 ), HVDC inverter (U 2 ), LC 2 filter circuit (LC 2 ), LC 4 filter circuit (LC 4 ) and step-up transformer (T 2 ). The LC 1 filter circuit (LC 1 ) includes a first reactor and capacitors connected in series on both sides of the first reactor, the other end of the capacitor is grounded, and the LC 3The filter circuit includes a fifth reactor and capacitors connected in series on both sides of the fifth reactor, the first reactor and the fifth reactor are connected in series, the other end of the capacitor is grounded, and the first reactor The input terminal and the high voltage rectifier circuit (U 1 ) is connected to the output end of the fifth reactor, and the output end of the fi...

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Abstract

The invention relates to a three-phase balanced electrified railway power supply system of a power grid, which comprises a step-down transformer, a high-voltage rectifier circuit, an LC1 filter circuit, a high-voltage DC inverter and an LC2 filter circuit connected in sequence. The invention fully considers the clutter problem of the circuit, and the system has an anti-interference function, and can filter the rectifying interference of the front stage and the inverting interference of the back stage. The invention changes the simple AC-DC-AC deviator, the LC1 filter circuit and LC2 filter circuit can remove clutter signals in the circuit correspondingly, the clutter interference can be reduced in the circuit. In addition, LC1 filter circuit and LC2 filter circuit can be used for high-voltage reactive power compensation to improve the efficiency of the circuit.

Description

technical field [0001] The invention relates to a three-phase balanced electric power supply system for electrified railways in a power grid. Background technique [0002] The high-speed rail is a single-phase AC load. The single-phase asymmetric harmonic current generated by the high-speed rail line, after being transformed by the traction transformer, the harmonic current injected into the power system at the high-voltage side is a three-phase unbalanced high-order harmonic, and has a fundamental wave Negative sequence current is injected into the power system. Since the high-speed rail locomotive is a high-power single-phase rectifier load with great fluctuations, for the three-phase symmetrical power system power supply, the high-speed rail traction load has the characteristics of nonlinearity, asymmetry and volatility, causing voltage fluctuations in the public power grid. Severe pollution of the power grid, while posing a threat to the stability and reliability of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 张明时振
Owner 北京中新发展清洁能源电力有限公司
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