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Multi-time-scale transient modeling method for cascaded converters in power electronics grid

A multi-time scale, power electronics technology, applied in the direction of power transmission AC network, circuit device, AC network circuit, etc., can solve the problems of increasing the complexity of the simulation model and affecting the efficiency of simulation calculation

Active Publication Date: 2022-03-11
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

The strong coupling between cascaded converters in the power grid and the differences in the time constants of each power electronic device will cause multiple movements of different low-frequency carriers, which increases the complexity of the simulation model: such as node admittance matrix, state space Dimension increases, etc., which in turn affects the efficiency of simulation calculations

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  • Multi-time-scale transient modeling method for cascaded converters in power electronics grid
  • Multi-time-scale transient modeling method for cascaded converters in power electronics grid
  • Multi-time-scale transient modeling method for cascaded converters in power electronics grid

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0058] The present invention first describes the switching pulse behavior of the sub-module bridge of the cascaded converter based on the transmission line wave process propagation theory, and establishes a semi-analytical description function model of the cascaded converter; in the slow dynamic change process, Fourier series is used Expanded formula, which converts the semi-analytical description function of the power electronic switch into a phase-shifting phasor model; depending on the unified modulation strategy and analytical signal processing, when the semi-analytical description function and the phase-shifting phasor function are switched in different simulation stages, it can realize Smooth transitions.

[0059] The present invention is mainly divided into the following three steps.

[0060] Step 1: Use the transmission line wave proce...

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Abstract

A multi-time-scale transient modeling method for cascaded converters in power electronic grids. Firstly, the transient characteristics of high-frequency switching of the converters are described based on the wave process description function, and the cascaded converters are designed through the wave process semi-analytical function. The equivalent controlled voltage source and controlled current source of the inverter sub-module, and then based on the Fourier series and frequency shift method, design the frequency-shifted phasor of the cascaded converter equivalent controlled voltage source and controlled current source function, and then combine the semi-analytical function and the frequency-shifting phasor function to build a multi-time-scale transient model of the cascaded converter. Quick simulation.

Description

technical field [0001] The invention relates to a multi-time-scale transient modeling method of a power electronic grid. Background technique [0002] Distributed renewable energy generation, electric vehicle charging, and motor frequency conversion generally require grid-connected converters, especially power electronic devices such as voltage source converters (voltage source converters, VSCs), to be connected to the grid. The H-bridge-based cascaded voltage source converter (cascaded H-bridge, CHB) has the advantages of modularity, scalability, low switching frequency and loss, and no need for power frequency transformers, and has attracted widespread attention in the industry. The VSC-based grid-connected converter exhibits high-frequency transient characteristics due to its power electronic switching characteristics, while the power grid with random renewable energy generation and load generally exhibits a slow dynamic process. Therefore, the transient dynamic behavior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 叶华刘垚裴玮孔力
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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