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Time scale layered automaton method for transient simulation of power electronic system

A technology of power electronics and time scale, applied in design optimization/simulation, electrical digital data processing, special data processing applications, etc., can solve the problems of slow simulation speed, poor convergence, difficulty in using complex power electronic systems, etc. The effect of stability and simulation efficiency improvement

Active Publication Date: 2021-05-07
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, although some literatures have publicly reported switching transient models of power electronic systems, such as physical models and parameter extraction methods for SiC MOSFETs (see T.R.McNutt, A.R.Hefner, H.A.Mantooth, D.Berning and S.Ryu, "Silicon Carbide Power MOSFET Model and ParameterExtraction Sequence,"in IEEE Transactions on Power Electronics,vol.22,no.2,pp.353-363,March 2007.), there are also some commercial software that provide switching transient simulation functions, such as Saber and LTspice, but these methods and software simulation efficiency is very low, the convergence is poor, it is difficult to apply to the transient simulation of complex power electronic systems
The main reason is that these methods and software model the switching device as a high-order nonlinear equivalent circuit, which makes the whole system a strong rigid system containing multiple time-scale components at the same time, resulting in poor simulation convergence; in order to improve the convergence , it is necessary to use a very small step size to solve the switching transient process, resulting in a very slow simulation speed

Method used

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  • Time scale layered automaton method for transient simulation of power electronic system
  • Time scale layered automaton method for transient simulation of power electronic system
  • Time scale layered automaton method for transient simulation of power electronic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: as image 3 Taking the half-bridge DC converter shown as an example, how to build a time-scale hierarchical automata model is introduced. When building an upper-level large-time-scale automaton, the circuit is divided into three modes according to the combination of switching devices, such as image 3 shown. List the circuit state equations in the three modes separately. In this example, they can be expressed in the following form:

[0065]

[0066] Among them, i=1, 2, 3 represent three modes, and the expression of each variable in different modes is

[0067]

[0068]

[0069]

[0070]

[0071]

[0072]

[0073] u=[V in ] (10)

[0074] Among them, A 1 、A 2 、A 3 is the state matrix in each mode, B 1 , B 2 , B 3 is the input matrix in each mode, R on is the device on-resistance, R load is the load resistance, L f is the filter inductance, C f is the filter capacitor, I L is the filter inductor current, V out is the filter...

Embodiment 2

[0097] Using the basic conversion unit shown in Embodiment 1, a complex two-way wireless charging system can be formed, such as Figure 5 shown. The system consists of two H-bridges and a compensation network, the power supply is simplified as a DC constant voltage source, and LC filters are used on both sides between the DC voltage source and the H-bridge. This is a two-way wireless charging system, so either side can be considered either the sending side or the receiving side. The control strategy of the system is divided into sending side control and receiving side control. Here we assume that the H-bridge converter on the left is the transmit side. According to the phase shift control, each converter adjusts the phase shift angle between the two branches (transmitter side converter with Indicates that the receiver side converter uses a express). The phase difference between the receiving side and the transmitting side (θ 2 ~θ 1 ) is denoted by θ. The transmit sid...

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Abstract

The invention discloses a time scale layered automaton method for transient simulation of a power electronic system, and belongs to the technical field of modeling of the power electronic system. The power electronic system is modeled as a time scale layered automaton, the time scale layered automaton comprises an upper layer large time scale automaton and a lower layer switch transient automaton, and the upper layer automaton describes the state and behavior of the power electronic system when a switch device is in a switch-on state or a switch-off state. The lower-layer automaton describes the state and behavior of the power electronic system in the on or off transient process of the switching device, and the time scale hierarchical automaton is calculated by using an event-driven method. According to the time scale layered automaton method for transient simulation of the power electronic system, the problems of transient simulation of a switch of the complex power electronic system in the aspects of simulation efficiency and convergence are solved.

Description

technical field [0001] The invention relates to the technical field of power electronic system modeling, in particular to a time-scale layered automata method for transient simulation of power electronic systems. Background technique [0002] With the continuous development of power electronics technology, especially the extensive use of wide bandgap semiconductor devices such as silicon carbide (SiC) metal oxide semiconductor field effect transistors (MOSFETs) in recent years, the switching frequency of power electronic systems has been continuously increased, reaching hundreds of Kilohertz or even megahertz levels. The increase of switching frequency reduces the volume and weight of the power electronic conversion system, increases the power density, reduces the output distortion, and brings simpler filter design. However, the high-speed switching process and high switching frequency of wide-bandgap semiconductor devices also bring significant challenges, such as severe e...

Claims

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Application Information

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IPC IPC(8): G06F30/20
CPCG06F30/20G06F2119/14Y02E60/00
Inventor 施博辰赵争鸣鞠佳禾虞竹珺朱义诚
Owner TSINGHUA UNIV