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Negative sequence component-considering MMC system simplified electromagnetic transient state modeling method

An electromagnetic transient model and negative sequence component technology, applied in the field of power transmission and distribution, can solve the problems of increasing the complexity of MMC modeling, not considering the influence of MMC converters in detail, and ignoring the dynamic process of MMC.

Active Publication Date: 2017-09-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

When the AC system considers the negative sequence voltage, due to the switching function of the converter, the positive sequence, negative sequence, and zero sequence components will be generated inside the MMC, which greatly increases the complexity of MMC modeling
At present, the simplified electromagnetic transient model of the MMC system considering the negative sequence component proposed at home and abroad does not consider the influence of the control system on the MMC converter in detail, or ignores the detailed dynamic process inside the MMC

Method used

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  • Negative sequence component-considering MMC system simplified electromagnetic transient state modeling method
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Embodiment Construction

[0066] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0067] figure 1 It is a schematic diagram of the MMC system of the present invention. In the figure, the MMC converter station is connected to the AC system through a converter transformer, and the converter transformer adopts a Y / △ connection mode to block the zero-sequence component of the AC system from being transmitted to the valve side. figure 1 Middle: R s , L s is the equivalent resistance and equivalent inductance of the AC system; u s is the voltage of the equivalent AC system; i s is the system side current; u dc1 is the DC voltage.

[0068] figure 2 It is the working principle diagram of the MMC of the present invention. Each converter has six bridge arms, and each bridge arm consists of N identical cascaded sub-modules (Sub-Module, SM), bridge arm reactor L arm and bridge arm equivalent resistance R arm It is formed in series, and a current-limiting ...

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Abstract

The invention belongs to the technical field of power transmission and power distribution, and particularly relates to a negative sequence component-considering MMC system simplified electromagnetic transient state modeling method. The modeling method comprises the steps of determining an analytical expression of a negative sequence component-considering MMC converter station internal sub module capacitive voltage and a bridge arm current in an abc static coordinate system according to internal dynamic characteristics of the MMC; establishing a simplified electromagnetic transient state model of the negative sequence component-considering MMC converter station and an alternating current and direct current system thereof in a dq rotary coordinate system according to an average switching function model; according to actual control strategies, establishing a control system simplified electromagnetic transient state model considering a phase sequence separation link and positive sequence and negative sequence current vector controllers; and establishing a negative sequence separation-considering MMC system simplified electromagnetic model according to the simplified electromagnetic transient state model of the converter station and the alternating current and direct current system thereof and the control system simplified electromagnetic transient state model, wherein the dynamic process, system parameter design and stability analysis of the negative sequence component and negative sequence control in the MMC converter station can be researched conveniently.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a simplified electromagnetic transient modeling method of an MMC system considering negative sequence components. Background technique [0002] Voltage Source Converter High Voltage Direct Current (VSC-HVDC) has great technical advantages in renewable energy grid connection, distributed generation grid connection, island power supply, urban distribution network power supply, etc., the module Modular Multilevel Converter (MMC) is a kind of VSC-HVDC topology. It has the advantages of modular design, good scalability, low switching frequency, and good waveform quality. It is the main practice of VSC transmission engineering at present. Topology. Since the flexible DC transmission system contains power electronic devices with high switching frequency, the detailed electromagnetic transient simulation will be limited by the simulation speed and...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/36
CPCH02J3/00H02J3/36H02J2203/20Y02E60/60
Inventor 赵成勇杨佳艺郭春义许建中丁平安宁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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