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A Numerical Simulation Method Applied to Electromagnetic Transient Analysis of Switching Circuits

A numerical simulation and electromagnetic transient technology, applied in design optimization/simulation, special data processing applications, etc., can solve problems such as numerical accuracy decline

Active Publication Date: 2021-04-06
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although each node analysis software uses certain numerical techniques to eliminate oscillations, these techniques to eliminate numerical oscillations are often first-order linear interpolation techniques, which will bring about a decrease in numerical accuracy

Method used

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  • A Numerical Simulation Method Applied to Electromagnetic Transient Analysis of Switching Circuits
  • A Numerical Simulation Method Applied to Electromagnetic Transient Analysis of Switching Circuits
  • A Numerical Simulation Method Applied to Electromagnetic Transient Analysis of Switching Circuits

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0155] image 3 Shows a bridge current source rectifier circuit, Table 2 is the form of its circuit topology stored in the computer. The simulation analysis is carried out using the patented method, and the basic step size is set to 2ms.

[0156] Table 2 branch information of the example

[0157]

[0158] First, execute the code of the method of listing the state equation of the circuit network for No. 1 to No. 5 branches in Table 3, and obtain the coefficient matrix as follows:

[0159]

[0160]

[0161]

[0162]

[0163] Thus, the system equation of the circuit is obtained and the equation of state

[0164]

[0165]

[0166] in: E is a unit diagonal matrix.

[0167] Define the state quantity at time zero as x 0 =(0,0,0,0,900,0,0,0,0,0) T .

[0168] 5.1 The first half cycle

[0169] At 0+ moment, due to the unidirectional conduction characteristic of the ideal diode, D2 and D3 will be turned on, while D1 and D4 will remain off. Referring t...

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Abstract

The invention relates to a numerical simulation method applied to the electromagnetic transient analysis of switching circuits, which includes: writing the system state equation of the circuit, and converting it into a first-order state equation through variable substitution; Modify the system state equation of the circuit; use the direct integration method to iteratively solve the first-order state equation; re-initialize the circuit node potential at the moment of the switch action; Numerical oscillation; proof of equivalence at switching moment. The technical solution provided by the invention can eliminate numerical oscillation at the switching time, and has the characteristics of good numerical stability and high numerical precision (second-order precision).

Description

technical field [0001] The invention relates to a numerical simulation method, in particular to a numerical simulation method applied to electromagnetic transient analysis of switching circuits. Background technique [0002] Electromagnetic transient analysis is an important part of power system simulation and a necessary tool for understanding the transient complex behavior of power systems. Most of the commonly used electromagnetic transient simulation software currently use the node voltage method as the underlying algorithm. The node voltage method first uses the numerical integration method to differentiate the characteristic equations of the dynamic components in the system, and obtains the Norton equivalent circuit in the form of the parallel connection of the equivalent calculated conductance and the historical item current source, and then obtains the node conductance matrix of the entire circuit system, and solves Get the instantaneous value of each node voltage i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 纪锋高冲魏晓光肖彩霞
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD