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Method and system for establishing constant admittance model of power electronic switch

A power electronic switch and model building technology, applied in the direction of electrical digital data processing, CAD numerical modeling, special data processing applications, etc.

Pending Publication Date: 2021-01-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the historical current is composed of voltage and current. When the switch is turned on and off, there will be non-native numerical oscillations caused by non-state quantity mutations (similar to the problem of implicit trapezoidal integration)

Method used

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  • Method and system for establishing constant admittance model of power electronic switch
  • Method and system for establishing constant admittance model of power electronic switch
  • Method and system for establishing constant admittance model of power electronic switch

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Embodiment Construction

[0061] The object of the present invention is to provide a method and system for establishing a constant admittance model of a power electronic switch, so as to provide a method for establishing a constant admittance switch model of a power electronic switch with high precision, small numerical oscillation and simple simulation.

[0062] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0063] like figure 1 and 5 As shown, the present invention provides a method for establishing a constant admittance model of a power electronic switch, and the establishment method includes the following steps:

[0064] Step 101, the closed switch in the power electronic switch circuit is equivalent to an RL series circuit, the open switch is equivalent to an RC parallel circuit, and an equivalent c...

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Abstract

The invention discloses a method and system for establishing a constant admittance model of a power electronic switch. According to the method, firstly resistors are introduced into a switching-on equivalent branch and a switching-off equivalent branch respectively, and a first-order dynamic circuit form with a damping function is formed; the optimal parameters of the equivalent circuits are determined through a final value theorem and the characteristic root analysis of a continuous time system, and the precision is improved; and finally, the constant admittance model of the power electronicswitching circuit in the preset working state is established through the exponential integration method, due to the fact that the exponential integration method has the L-stability, numerical oscillation during switching action can be effectively restrained. Because the exponential integral method has high-order precision, consistency of simulation algorithms before and after the switching actioncan be realized, and complexity caused by state switching is avoided. The invention provides the power electronic switch constant admittance switch model establishing method which is high in precision, small in numerical oscillation and simple in simulation.

Description

technical field [0001] The invention relates to the technical field of power electronic switch performance analysis, in particular to a method and system for establishing a constant admittance model of a power electronic switch. Background technique [0002] In recent years, the rapid development of large-scale new energy power generation, high-voltage direct current transmission technology, and flexible alternating current transmission (FACTS) technology has led to a rapid increase in the proportion of power electronic devices in the grid, and the current trend of power electronics in the grid is becoming more and more obvious. Accurate, high-efficiency and real-time simulation of the converter system containing a large number of power electronic devices is very important for the research of the power grid. As the core device of the converter, the transient error of the switch model and the selection of the numerical integration algorithm are related to the efficiency of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/367G06F30/3308G06F17/16G06F17/13G06F111/10
CPCG06F30/367G06F30/3308G06F17/13G06F17/16G06F2111/10
Inventor 许明旺姚蜀军韩民晓
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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