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MMC Fast Simulation Model and Method of Diode Freewheeling Effect Considering Bridge Arm Blocking

A simulation model, diode technology, applied in the direction of design optimization/simulation, AC network circuit, power transmission AC network, etc., can solve the problem that the bridge arm average value model cannot correctly simulate MMC blocking and so on

Active Publication Date: 2022-02-01
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention proposes a fast simulation model and method of MMC considering the diode freewheeling effect when the bridge arm is blocked, mainly solving the problem that the existing bridge arm average value model cannot correctly simulate the MMC blocking

Method used

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  • MMC Fast Simulation Model and Method of Diode Freewheeling Effect Considering Bridge Arm Blocking
  • MMC Fast Simulation Model and Method of Diode Freewheeling Effect Considering Bridge Arm Blocking
  • MMC Fast Simulation Model and Method of Diode Freewheeling Effect Considering Bridge Arm Blocking

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Embodiment 1

[0033] Such as figure 1 As shown, this embodiment proposes a fast simulation model of MMC considering the diode freewheeling effect when the bridge arm is blocked, and each bridge arm of the MMC is equivalent to the corresponding bridge arm equivalent circuit, and the bridge arm equivalent circuit is composed of a The series branch is composed of a coupled parallel branch, and the series circuit and the parallel circuit are connected by a freewheeling circuit.

[0034] In the present invention, a bridge arm equivalent circuit is formed by coupling a series branch and a parallel branch, and then the series circuit and the parallel circuit are connected through a freewheeling circuit, while considering the freewheeling effect of the freewheeling diode, fast simulation of the MMC can be realized , and the present invention can correctly simulate the process of the transient change of the system parameters after the MMC is locked, so as to give more accurate results when simulatin...

Embodiment 2

[0045] A fast MMC simulation method considering the freewheeling effect of the diode when the bridge arm is blocked, using the above-mentioned simulation model for simulation, is suitable for the following two simulation conditions:

[0046] The first simulation condition is:

[0047] Equivalent resistance of series bridge arm R sm set to zero (R sm =0), the three thyristors are turned off, and the turn-off resistance value is set to an infinite resistance (R Toff =∞), used to simulate the steady-state operation of the modular multilevel converter;

[0048] The second simulation condition is:

[0049] Equivalent resistance of series bridge arm R sm set to an infinite resistor (R sm =∞), the three thyristors are all turned on, and the thyristor T is set 1 The on-resistance of is the equivalent on-resistance of all conducting anti-parallel diodes, setting the thyristor T 2 and T 3 The on-resistance of is half of the equivalent on-resistance of all conducting anti-paralle...

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Abstract

The invention discloses a MMC fast simulation model and method considering the freewheeling effect of the diode when the bridge arm is blocked, and each bridge arm of the MMC is equivalent to a corresponding bridge arm equivalent circuit, and the bridge arm equivalent circuit consists of a series branch Composed of a coupled parallel branch, the series circuit and the parallel circuit are connected by a freewheeling circuit. The beneficial effects of the present invention are: while considering the freewheeling effect of the freewheeling diode, fast simulation of the MMC can be realized, and the present invention can correctly simulate the process of the transient change of the system parameters after the MMC is blocked, so that when simulating the scene of the bridge arm blocked give more accurate results.

Description

technical field [0001] The invention relates to the field of flexible DC power transmission in power systems, in particular to an MMC fast simulation model and method considering the freewheeling effect of a diode when a bridge arm is blocked. Background technique [0002] Modular multilevel converter (MMC) has attracted extensive attention due to its high waveform quality and low power loss, and has become a research hotspot in the academic circle in recent years. A large number of sub-modules (SM) of MMC bring a huge burden to its electromagnetic transient simulation. At present, there are many fast simulation methods of MMC, such as MMC general equivalent model based on controlled source, average value model, bridge arm average value model, etc. The MMC general equivalent model based on the controlled source reduces the order of the admittance matrix by disconnecting the sub-modules. Although the charge and discharge states of the capacitors of each sub-module can be sim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/36H02M7/00H02M7/483G06F30/20
CPCH02J3/00H02J3/36H02M7/00H02M7/483G06F30/20H02J2203/20H02M7/4835Y02E60/60
Inventor 严喜林樊丽娟吴健颖冯雷国建宝杨光源张楠梁宁
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID