Design method for multi media card (MMC) self-defining submodule based on real time digital system (RTDS)

A design method and sub-module technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problem that MMC components of modular multi-level converters cannot be used to study the control and protection strategy of a single sub-module

Active Publication Date: 2013-03-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the modular multilevel converter MMC element that comes with the real-time digital simulator RTDS described in the background technology cannot be used to study the control and protection strategy of a single sub-module failure, the present invention proposes an RTDS-based MMC automatic Design method for defining submodules

Method used

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  • Design method for multi media card (MMC) self-defining submodule based on real time digital system (RTDS)
  • Design method for multi media card (MMC) self-defining submodule based on real time digital system (RTDS)
  • Design method for multi media card (MMC) self-defining submodule based on real time digital system (RTDS)

Examples

Experimental program
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Effect test

example 1

[0107] Simulation example 1: Test the correctness of rtds_SM:

[0108] First, build single-phase two-level test models in PSCAD / EMTDC and RTDS respectively, as follows Figure 12 (a) and (b) in. The SM model under PSCAD / EMTDC is directly built with a single simulation component. Under RTDS, the rtds_SM model of the present invention is adopted.

[0109] Then, set the parameters of the test system as follows: single-phase AC power voltage amplitude 2.5kV, phase angle 4°, frequency f=50Hz, internal resistance R s =1Ω, inductance L s =0.4H; sub-module capacitance 3mF; bridge arm current limiting reactance 0.04H; DC side power supply voltage V d =2kV, internal resistance 1Ω. The trigger pulse is tested with a square wave of 100Hz and a duty cycle of 0.5. Simulation results such as Figure 13 shown.

example 2

[0110] Simulation example 2: 7-level MMC DC transmission system based on rtds_SM:

[0111] Build a 7-level MMC DC transmission system based on the custom submodule rtds_SM on the RTDS (such as Figure 14 ), the system adopts a modulation strategy of carrier phase shift combined with capacitor voltage equalization control, and a controller for circulating current suppression is designed. In the runtime of RTDS, the waveforms of the electrical quantities of converter station 1 are measured as follows: Figure 15 shown.

[0112]

[0113] Simulation resource analysis: the bridge arm of the converter station of the 7-level MMC direct current transmission system is connected in series by 6 custom sub-modules, and a converter station has 6*2*3=36 sub-modules in total, which can be known from the simulation software: Each custom sub-module occupies 1 / 20 of the GPC cards, and a converter station of the 7-level MMC system only occupies 36*1 / 20=1.8 GPC cards.

[0114] The above exp...

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Abstract

The invention discloses a design method for a multi media card (MMC) self-defining submodule based on a real time digital system (RTDS) in the technical field of power system running and control. The technical scheme is that the design method comprises building a submodule equivalent model containing an insulated gate bipolar transistor (IGBT), a bypass diode, a capacitor element, a bypass switch used for submodule control and protection and a bypass thyristor element, writing programs of the self-defining submodule according to a program development language of Cbuilder, and achieving various running states of the submodule. The design method has the advantages that the provided self-defining submodule can accurately simulate a simulation model composed of discrete components, simulation precision is high, a carrier wave phase shift modulation strategy can be combined, capacitance voltage-sharing of the submodule can be achieved without building a capacitance voltage-sharing controller externally, and occupied resources of the controller are reduced. In addition, signals for representing submodule faults can be output in input end signals of the submodule so as to be used for testing a control protecting device of the submodule.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a design method of an RTDS-based MMC self-defined submodule. Background technique [0002] In recent years, with the development of renewable energy such as wind power and solar power, the light-duty direct current transmission system (VSC-HVDC) based on voltage source converters has been widely used due to its advantages of economy, flexibility and high controllability. Rapid application and development. Light DC transmission is widely used in renewable energy such as large-scale wind farm grid connection, distributed generation grid connection, island power supply, large city power grid power supply, asynchronous AC grid interconnection, multi-terminal DC transmission and other fields. [0003] However, conventional VSC-HVDC systems generally use two-level or three-level voltage source converters, which have the disadvantages of high swit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 刘崇茹林雪华李海峰林周宏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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