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AC-DC bidirectional converter simulation method suitable for power flow simulation calculation

A bidirectional converter and simulation computing technology, applied in computing, computer-aided design, instruments, etc., can solve the problem of inability to accurately simulate the electrical external characteristics of AC and DC bidirectional converters, and achieve strong versatility and simple implementation. , the effect of high calculation accuracy

Pending Publication Date: 2021-12-28
CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RES INST
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Problems solved by technology

[0018] At present, the power flow simulation calculation of the urban rail transit power supply system, for the generalized load of the AC-DC bidirectional converter, the simulation method basically adopts the model of voltage source plus internal resistance or the model of pure current source for equivalent, which cannot accurately simulate the AC Complicated Electrical External Characteristics of DC Bidirectional Converter

Method used

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  • AC-DC bidirectional converter simulation method suitable for power flow simulation calculation
  • AC-DC bidirectional converter simulation method suitable for power flow simulation calculation
  • AC-DC bidirectional converter simulation method suitable for power flow simulation calculation

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Embodiment Construction

[0059] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] Embodiments of the present invention provide an AC / DC bidirectional converter simulation method suitable for power flow simulation calculation, including the following steps:

[0061] S1: Establish the main circuit model, such as image 3 As shown, the main circuit model is composed of unconnected DC loop and AC loop; the DC loop has two branches, one of which is composed of switching elements K 1 , resistance element R , Controlled DC voltage source U con Formed in series, branch two consists of switching elements K 2 , Controlled DC current source I con Formed in series; the AC loop has three branches, each containing a controlled AC current source I a , controlled AC current source I b , controlled AC current...

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Abstract

The invention provides an AC-DC bidirectional converter simulation method suitable for power flow simulation calculation, and the method comprises the following steps: establishing a main circuit model which is composed of a DC loop and an AC loop which are not connected; wherein the direct-current loop has two branches: the first branch is formed by connecting a switch element K1, a resistor element R and a controlled direct-current voltage source Ucon in series, and the second branch is formed by connecting a switch element K2 and a controlled direct-current current source Icon in series, and the alternating current loop has three branches: a controlled alternating current source Ia, a controlled alternating current source Ib and a controlled alternating current source Ic; establishing a control system calculation unit, and calculating each simulation step length. The complex electrical external characteristics of the AC-DC bidirectional converter are simulated by establishing the main circuit model and the control system calculation unit, a converter circuit containing a large number of power electronic devices does not need to be established, the engineering precision requirement is met, and the simulation speed is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power flow simulation calculations for rail transit power supply systems, and in particular relates to an AC / DC bidirectional converter simulation method suitable for power flow simulation calculations. Background technique [0002] At present, most urban rail transit power supply systems use rectifier units to convert electric energy from three-phase alternating current to direct current to power trains. Since the diode rectification circuit of the rectifier unit can only flow energy in one direction, a large amount of regenerative braking energy generated by the train during frequent braking cannot be returned to the upper-level AC network of the power supply system through the rectifier unit. If the regenerative braking energy generated by a train cannot be absorbed by adjacent trains, it will be consumed on braking resistors or brake shoes, resulting in energy waste and temperature rise in the tunnel....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/3308G06F30/32G06Q50/06
CPCG06F30/3308G06F30/32G06Q50/06
Inventor 李力鹏于晓杰李金华陈怀鑫王立天肖立君靳佩跃刘广欢康克农韩喆孔清
Owner CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RES INST
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