An Electromechanical Transient Modeling Method for a Decentralized Access LCC-MMC Hybrid DC System

A hybrid DC and transient modeling technology, which is applied to AC network circuits, circuit devices, power transmission AC networks, etc., can solve the problems that the electromechanical transient modeling of UHV decentralized access hybrid DC systems has not been perfected, and achieves The effect of improving simulation speed and calculation efficiency and meeting calculation accuracy requirements

Active Publication Date: 2020-06-30
STATE GRID JIANGSU ECONOMIC RES INST +2
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Problems solved by technology

However, the electromechanical transient modeling of the UHV decentralized access hybrid DC system has not yet been perfected.

Method used

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  • An Electromechanical Transient Modeling Method for a Decentralized Access LCC-MMC Hybrid DC System
  • An Electromechanical Transient Modeling Method for a Decentralized Access LCC-MMC Hybrid DC System
  • An Electromechanical Transient Modeling Method for a Decentralized Access LCC-MMC Hybrid DC System

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Embodiment Construction

[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] In the hybrid DC system, considering the economy, the rectifier side uses the LCC converter station, while the inverter side uses the MMC to eliminate the commutation failure problem, figure 1 The unipolar topology of the distributed access LCC-MMC hybrid DC system is given, in which the LCC rectifier station is composed of two twelve-pulse LCC converters connected in series, which are centrally connected to the power grid at the sending end, and the MMC inverter station is composed of high-voltage It is obtained in series with two low-voltage MMC groups, and each MMC group is obtained by connecting several MMCs in parallel. Different MMCs can be connected to different AC buses to achieve the purpose of decentralized access.

[0047] The topology a...

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Abstract

The invention discloses an electromechanical transient modeling method of a decentralized access type LCC-MMC hybrid direct current system. According to the components of the decentralized access type LCC-MMC hybrid direct current system, the method establishes an electromechanical transient model of an LCC rectifier station, The electromechanical transient model of the DC line, the electromechanical transient model of the MMC converter and the interface model between the MMC converters. Thus, the modeling method of the present invention fills the gap in the electromechanical transient model of the decentralized access LCC-MMC hybrid DC system, avoids the use of the electromagnetic transient model for power grid planning and security and stability calculations, thereby improving simulation speed and calculation efficiency , which can effectively approximate the response characteristics of the electromagnetic transient model and meet the calculation accuracy requirements.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to an electromechanical transient modeling method of a decentralized access type LCC-MMC hybrid direct current system. Background technique [0002] With the increase of the load in the central and eastern regions, the capacity of the long-distance DC transmission system is also increasing day by day. The centralized feed-in of the single point of the inverter station to the receiving-end grid may cause the problem that the receiving-end grid cannot accommodate it, and the multi-point of the inverter station is dispersed. Connecting to the receiving end grid can effectively solve this problem. Moreover, the simultaneous commutation failure of multiple DC LCC (Line Commutated Converter, grid commutation converter) inverter stations in the multi-infeed receiving-end grid will seriously threaten the safe and stable operation of the receiving-end grid, while the MMC (M...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 祁万春蔡晖徐政王国腾谢珍建黄俊辉韩杏宁李辰王荃荃
Owner STATE GRID JIANGSU ECONOMIC RES INST
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