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A small-signal modeling method of mmc module in mmc-hvdc transmission system

A technology of MMC-HVDC and power transmission system, applied in the field of MMC module small signal modeling of MMC-HVDC power transmission system, can solve problems such as affecting the dynamic characteristics of the system, complex MMC topology structure, etc., achieving the effect of small calculation amount and high simulation efficiency

Active Publication Date: 2019-05-07
SICHUAN UNIV
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Problems solved by technology

However, the MMC topology is very complex. Most technologies ignore the MMC module directly when modeling the MMC-HVDC transmission network with small signals. In fact, the MMC module's own loss will affect the system by affecting the DC side active output of the converter. dynamic characteristics

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  • A small-signal modeling method of mmc module in mmc-hvdc transmission system
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  • A small-signal modeling method of mmc module in mmc-hvdc transmission system

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. use as figure 1 The two-terminal MMC-HVDC direct current transmission system shown.

[0040] figure 1 The left side of the middle is the rectifier side, whose network parameter subscript is 1, and the right side is the inverter side, whose network parameter subscript is 2, and the current flow direction is the positive direction shown by the arrow in the figure. is the equivalent voltage source of the AC active network connected to the converter, R n +jX n is the equivalent impedance of the active network, is the voltage at the common coupling point PCC, the converter transformer is connected in Y-Δ mode, R f and L f are the equivalent resistance and reactance of the converter transformer and reactor, respectively, is the output voltage of the AC side of the converter, and the DC line adopts π-type equivalent, is the DC side...

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Abstract

The invention discloses an MMC module small-signal modeling method for an MMC-HVDC power transmission system. An average value model is converted from a three-phase static coordinate system into a two-phase synchronous rotating coordinate system; and the converted average value model is subjected to linearization to obtain an MMC module small-signal model. The model provided by the invention takes model loss into consideration, so that dynamic response of the MMC topological structure-based current converter external characteristic on the connected alternating current and direct current networks can be well reflected; meanwhile, the method is relatively less in calculated amount, high in simulation efficiency, and suitable for all-system low-disturbance stability analysis without needing to observe internal dynamic characteristics of the MMC.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, in particular to an MMC-HVDC (flexible direct current transmission system based on modular multilevel converter) power transmission system MMC module small signal modeling method. Background technique [0002] As a new generation of DC transmission technology, voltage source converter based high-voltage dc (VSC-HVDC) technology has excellent characteristics such as flexible control and high power factor compared with traditional DC transmission technology. Power systems including flexible HVDC transmission are subject to small disturbances such as load fluctuations and slow changes in network parameters at any time. Therefore, a good power system must be stable with little disturbance, otherwise the system cannot operate normally even under stable conditions. [0003] There are three main types of voltage source converters (VSCs) used in flexible DC transmission projects: two-...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/36
CPCH02J3/00H02J3/36H02J2203/20Y02E60/60
Inventor 刘天琪喻悦箫曾雪洋王顺亮彭乔王峰
Owner SICHUAN UNIV
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