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Method for calculating harmonic wave and negative sequence current of electrified railway

An electrified railway, negative sequence current technology, applied in electrical components, circuit devices, harmonic reduction devices, etc., can solve problems such as endangering the safety and reliability of public power grid operation, poor handling, etc., and achieve convenient selection and viewing. Effect

Inactive Publication Date: 2012-07-11
CHINA ELECTRIC POWER RES INST +1
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AI Technical Summary

Problems solved by technology

After the electrified railway traction substation is connected to the power grid, a large amount of harmonic and negative sequence current will be injected into the system, which will seriously endanger the safety and reliability of the public power grid operation if not handled properly

Method used

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  • Method for calculating harmonic wave and negative sequence current of electrified railway
  • Method for calculating harmonic wave and negative sequence current of electrified railway
  • Method for calculating harmonic wave and negative sequence current of electrified railway

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Embodiment Construction

[0022] The present invention is a specific implementation plan process for calculating the harmonic power flow of the power grid, such as figure 1 As shown, a simple calculation process can be described as:

[0023] a. job definition, which determines the operation mode of the grid in the power system analysis integrated program (PSASP);

[0024] b. Determine the harmonic model of each component in the power grid, including harmonic analysis indicators, etc.;

[0025] c. If there is a traction transformer in the power grid, the model of the traction transformer is established, and the basic parameters of the traction transformer and the harmonic values ​​and negative sequence current values ​​generated by the electrified railway on the low-voltage side are directly input in the power system analysis comprehensive program (PSASP). The method converts the two-phase parameters of the traction power supply system into three-phase parameters; if there is no traction transformer, s...

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Abstract

Power system harmonic analysis is to determine harmonic voltage and harmonic current in a system through calculation or judge whether a system is close to harmonic resonance state by calculating the frequency response of a network and calculate how to reduce the possibility of system resonance, which is according to a given power network structure, parameters and operation modes of a power network. The invention discloses a method for calculating harmonic wave and negative sequence current of an electrified railway, which builds harmonic models of common elements in the power network according to the practical situation of the power network. The invention also provides a novel equivalent method of a tractive power supply system, which converts a two-phase parameter of a tractive transformer and parallel compensation and traction load in the tractive power supply system into a three-phase parameter corresponding to a three-phase power system topological structure. The method of the invention determines harmonic models of all elements according to the operation modes of the power network, so as to perform corresponding calculation. The method in the invention particularly has a prominent advantage in calculating harmonic power flow and negative sequence current produced by the electrified railway.

Description

technical field [0001] The invention relates to the calculation of harmonic flow and negative sequence current in the power system, and is especially suitable for the calculation of harmonic flow and negative sequence current generated by electrified railways. Background technique [0002] Harmonic analysis of power system is to determine the distribution of harmonic current in the system and the voltage and current waveforms of each part through the calculation of harmonic power flow according to the given grid structure, parameters, and operating conditions of components such as loads and harmonic source filters. The degree of distortion, or by calculating the frequency response of the network to determine whether the system is close to a harmonic resonance state and how to reduce the possibility of system resonance. [0003] The electrified railway power supply system is usually a two-phase system, which is very different from the conventional three-phase power system in ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/50H02J3/26Y02E40/40G06F17/10H02J2003/007H02J2203/20
Inventor 李文臣李小平安宁孙建波陈兴雷李淼李大虎
Owner CHINA ELECTRIC POWER RES INST
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