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Electromechanical transient modeling method for LCC-MMC hybrid direct current grid

A technology of hybrid DC and modeling methods, applied in AC network circuits, power transmission AC networks, circuit devices, etc., can solve problems such as difficult modeling, and achieve the effects of low modeling difficulty, convenient implementation, and high accuracy

Active Publication Date: 2018-07-27
YUNNAN POWER GRID
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Problems solved by technology

[0005] This application provides an electromechanical transient modeling method for the LCC-MMC hybrid DC grid to solve the problem that the modeling of the electromechanical transient process in the current converter station is difficult

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  • Electromechanical transient modeling method for LCC-MMC hybrid direct current grid
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  • Electromechanical transient modeling method for LCC-MMC hybrid direct current grid

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Embodiment Construction

[0052] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0053] see figure 1 , the embodiment of the present application provides an electromechanical transient modeling method of an LCC-MMC hybrid DC power grid, including:

[0054] Step 101, constructing the algebraic equation of the equivalent circuit of the AC side of the LCC converter station, the differential equation of the equivalent circuit of the DC side of the LCC converter station, the differential equation of the equivalent circuit of the AC side of the MMC converter station, and the DC side of the MMC converter station, etc. Differential equations for effective circuits.

[0055] The algebraic equation of the equivalent circuit on the AC side of the LCC converter station is:

[0056]...

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Abstract

The invention discloses an electromechanical transient modeling method for an LCC-MMC hybrid direct current grid. A constructed electromechanical transient model of the LCC-MMC hybrid direct current grid takes the dynamic characteristics of a MMC direct current side model into account, so the accuracy of the model is higher. In addition, the method adopts a state space expression for unified combination solving of an algebraic-differential mathematical model of a direct current network and a converter station, and an algebraic-differential equation of a controller, so that the modeling difficulty is low, and the implementation is convenient. The model constructed by the method can be used for transient stability analysis of the LCC-MMC hybrid direct current grid, and has important application in planning, designing and running of the grid.

Description

technical field [0001] The present application relates to the technical field of high-voltage direct current transmission, and in particular to an electromechanical transient modeling method of an LCC-MMC hybrid direct current power grid. Background technique [0002] The line commutated converter (Line Communicated Converter, LCC) plays an extremely important role in the direct current transmission of high voltage level and large capacity power transmission. The traditional DC transmission system of LCC has the advantages of mature technology, rich operating experience and high economy. However, the inverter side of the traditional DC transmission system based on LCC faces the risk of commutation failure. DC systems generate a lot of shock. Modular Multilevel Converter (MMC) is a hot topic in academia and industry. The MMC-based flexible direct current transmission system (MMC-HVDC) integrates new energy sources such as photovoltaics and wind power into the grid, realizes...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 游广增徐政朱欣春李玲芳肖亮
Owner YUNNAN POWER GRID
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