MMC general simulation model suitable for AC/DC fault ride-through research

A technology of fault ride-through and simulation model, applied in the field of flexible DC, it can solve the problems such as the inability to realize the universal model, the limited application of the model, and the low efficiency, and achieve the effect of reducing the number of circuit nodes, good versatility, and convenient simulation analysis.

Pending Publication Date: 2022-02-18
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, there are still problems to be solved in the electromagnetic transient simulation, that is, the applicability of the model is relatively limited, and the commonality of the model cannot be realized between MMCs composed of different types of sub-modules, and a variety of different models need to be selected To deal with different MMC, resulting in cumbersome operation and low efficiency

Method used

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  • MMC general simulation model suitable for AC/DC fault ride-through research
  • MMC general simulation model suitable for AC/DC fault ride-through research
  • MMC general simulation model suitable for AC/DC fault ride-through research

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Embodiment

[0068] Such as figure 1 As shown, the present embodiment provides a general simulation model of MMC suitable for AC-DC fault ride-through research, the model includes several bridge arms, and each bridge arm includes several sub-modules; several capacitors are connected in the bridge arms and each The capacitance values ​​of the capacitors are equal, and the corresponding voltage balance of each capacitor is equal, that is:

[0069]

[0070] Among them, u c,1 , u c,2 , u c,3 ... u c,Nt Respectively, the voltage distributed by the corresponding capacitor, u c A balanced equal voltage is distributed for each capacitor, u c,i The voltage assigned to the i-th capacitor, N t To obtain the capacitor serial number of the assigned voltage, N c is the number of capacitors;

[0071] In the model, all power electronic switching devices and diodes have the same turn-on voltage drop, and the output voltage of the ith sub-module in the bridge arm is:

[0072] u sm,i =L i u c...

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Abstract

The invention relates to the technical field of flexible direct current, in particular to an MMC general simulation model suitable for AC / DC fault ride-through research. An MMC general bridge arm model and a bridge arm average value model (UAAM) which do not contain additional switches and diodes are provided aiming at the rapid electromagnetic transient simulation problem of MMC.The model assumes that the capacitor voltage in the bridge arm is well balanced, and the bridge arm circuit is equivalent to a series circuit of a controlled voltage source and a controlled resistor. A universal bridge arm average value model (UAAM) after averaging and equivalence of a simulation model fully considers the follow current characteristic of a diode, and a controlled voltage source and a controlled resistor are calculated according to the on / off state of the diode, so that the locking behavior characteristic of the bridge arm can be accurately reflected under the condition of not additionally adding a switch and the diode, the number of circuit nodes is reduced, and the simulation efficiency is improved.

Description

technical field [0001] The invention relates to the field of flexible direct current technology, in particular to an MMC general simulation model suitable for research on AC and DC fault ride-through. Background technique [0002] The flexible DC back-to-back power transmission system has a considerable power capacity and voltage level. The number of MMC power sub-modules used is huge and the operating characteristics are complex. In the electromagnetic transient simulation modeling, the scale and calculation amount are huge, and the simulation calculation amount (time) needs to be solved. Contradictions with the scale of the electromagnetic simulation platform. [0003] In the MMC, the U-I operating range of the bridge arm reflects the operating characteristics of the sub-modules in it, and also determines the operating characteristics of the MMC. Therefore, when focusing on the analysis of electrical quantities at the MMC device level and system level, the MMC bridge arm ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20H02J3/36
CPCG06F30/20H02J3/36H02J2203/20Y02E60/60
Inventor 赵小娟何永胜陈咏涛朱小军王瑞妙乐昕怡杨爽马兴周敬森
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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