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A power electronic system simulation method for switching time self-correction

A technology of power electronics and switching time, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as increased program complexity and poor simulation accuracy, to eliminate numerical oscillation problems, improve efficiency, and improve simulation. The effect of precision

Inactive Publication Date: 2018-07-06
TSINGHUA UNIV +3
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Problems solved by technology

[0003] There are three typical interpolation methods currently used: the first is the cubic interpolation method, and its advantage is that it only needs to use the trapezoidal integral formula, which is easy to implement; the second is the CSSC method (clock synchronized status changing), which only needs to use To two interpolation, and only need to use the trapezoidal integral formula, but the second interpolation uses extrapolation, so the simulation accuracy is poor; the third is the DSDI method (double-step double interpolation), which requires two interpolation , due to the need to switch between the trapezoidal integral formula and the backward Euler integral formula, the program complexity increases

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  • A power electronic system simulation method for switching time self-correction
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  • A power electronic system simulation method for switching time self-correction

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Embodiment Construction

[0045] The power electronic system simulation method for switching time self-calibration proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0046](1) Establish the electromagnetic transient equivalent model of each component in each branch of the power electronic system, including the following steps:

[0047] (1-1) Set the form of the differential equation of the branch composed of resistance, inductance, capacitance, transmission line, cable, generator or power electronic switch in the power electronic system as:

[0048]

[0049] Among them, x is the state variable of the above components in each branch, f is a smooth continuous function, and t is the simulation time;

[0050] (1-2) Transform the differential equations of resistors, inductors, capacitors, transmission lines, cables, or generators in each branch of the above-mentioned power electronic system into differential equations in the two-stage discret...

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Abstract

The invention relates to a switching time self-correcting power electronic system simulation method, and belongs to the technical field of electromagnetic transient analysis of an electric power system. The method comprises: firstly, using a two-stage integration method to derive an element level Norton equivalent model, and then through a node voltage method to perform electromagnetic transient calculation; a switching model using an ADC model, that is, an inductance capacitance model; when a system detects on-off operation and breaker operation, using an interpolation algorithm of the two-stage integration method to solve, and through one interpolation and regulation of [mu] and h values, an interpolation process is completed. Since network solution uses the higher-order algorithm provided in the invention, the method can improve simulation precision, and since the interpolation method is simple and efficient in calculation, implementation of offline simulation and real-time simulation is easy, and the method is suitable for engineering popularization.

Description

technical field [0001] The invention relates to a power electronic system simulation method for switching time self-correction, and belongs to the technical field of electromagnetic transient analysis of power systems. Background technique [0002] Digital simulation is an important tool for researching new energy and power electronic technologies such as flexible AC transmission system (FACTS). The sudden change of high-frequency system caused by power electronic switches will cause numerical oscillation problems, which poses new challenges to the system-level simulation containing a large number of power electronic switches. At present, how to design the numerical integration method and interpolation method with high accuracy, high calculation efficiency and stable numerical performance is the key problem to further solve the simulation of power system with switch sub-network. [0003] There are three typical interpolation methods currently used: the first is the cubic in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 舒德兀张树卿刘栋朱琳寇龙泽
Owner TSINGHUA UNIV
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