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Real-time-digital-simulator-based modular multi-level converter bridge arm modeling method

A modular multi-level, real-time digital simulation technology, applied in the direction of instruments, simulators, control/regulation systems, etc., can solve the difficulty of MMC converter fault simulation, reduce the dimension of the admittance matrix of the MMC-HVDC system, and cannot use Converter protection control strategy and other issues

Active Publication Date: 2018-04-20
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to speed up the simulation speed of the MMC system, most of the existing MMC modeling methods are equivalent to a 2-node package model for the bridge arm of the MMC. This method greatly reduces the dimension of the admittance matrix of the MMC-HVDC system. But at the same time, it also brings the difficulty of simulating the internal faults of the MMC converter.
Most of the existing models do not have the function of converter fault simulation or can only simulate a few types of faults, so they cannot be used for the research of converter protection control strategies

Method used

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  • Real-time-digital-simulator-based modular multi-level converter bridge arm modeling method

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Embodiment 1

[0092] Firstly, a custom module to implement the above bridge arm hybrid model is written in RTDS / CBuilder:

[0093] Step 1: According to the internal capacitors and power electronic device failures of the studied sub-modules, the sub-modules cascaded in the MMC bridge arm of the modular multilevel converter are divided into special sub-modules and general sub-modules;

[0094] Step 2: Establish a detailed equivalent model for each special sub-module obtained in step 1, and then model the fault status of all devices in each special sub-module, so that the special sub-module has a fault simulation function;

[0095] Step 3: Establish a simplified equivalent model for the general sub-module obtained in step 1, and use a controlled voltage source to reflect the port voltage of all sub-modules as a whole equivalent to a controlled current source and a capacitor Sum;

[0096] Step 4: The switch SW, the D1 diode and the D2 diode form a combination switch. The switch SW is connected...

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Abstract

The invention, which belongs to the technical field of power system operation and control, relates to a real-time-digital-simulator-based modular multi-level converter bridge arm modeling method. A bridge arm hybrid model is established for a bridge arm of a modular multi-level converter (MMC), a simplified equivalent model is established by L special sub modules in the bridge arm, and a detailedequivalent model is established by M common sub modules; modeling of fault states of all devices in the detailed and equivalent sub modules is carried out, so that the model is able to simulate internal faults of the sub modules; and then a fault node is added in the bridge arm model and thus the model is able to simulate a bridge arm fault. Therefore, a problem of resource limitation of modular multi-level converter system simulation by the real-time digital simulator in a GPC / PB5 environment is solved, so that the model can be applied to high-level MMC system simulation; and internal fault simulation of various converters can be completed, so that the study of the MMC protection control strategy is realized well.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and relates to a modeling method for a bridge arm of a modular multilevel converter based on a real-time digital simulator. Background technique [0002] Modular Multilevel Converter (MMC) has been widely used because of its high output level, low harmonic content, and independent control of active power and reactive power. For high-voltage power transmission systems, MMC needs to reach hundreds of levels to meet the high-voltage and large-capacity requirements of actual engineering, which brings great challenges to the real-time simulation of MMC. Real-Time Digital Simulator (RTDS) is a device specially used to study electromagnetic transient phenomena in power systems, and is widely used in power system simulation real-time simulation research. Users can develop MMC converter models in the CBuilder tool provided by RTDS for simulation research on the dynamic characte...

Claims

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Application Information

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IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 孙吉波王洁聪伍双喜刘崇茹黄国栋谢国超徐春华杨银国钱峰
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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