Modeling method of LCC-MMC series hybrid direct-current power transmission system

A power transmission system, hybrid DC technology, applied in the direction of converting AC power input to DC power output, AC network circuit, output power conversion device, etc., can solve problems that have not yet been reported.

Active Publication Date: 2020-12-11
HUAZHONG UNIV OF SCI & TECH +2
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Problems solved by technology

Many scholars have studied the small-signal model of LCC, MMC and LCC-MMC parallel hybrid HVDC transmission system. In the LCC-MMC series hybrid HVDC system, LCC and MMC are directly c

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  • Modeling method of LCC-MMC series hybrid direct-current power transmission system
  • Modeling method of LCC-MMC series hybrid direct-current power transmission system
  • Modeling method of LCC-MMC series hybrid direct-current power transmission system

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Embodiment Construction

[0080] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0081] figure 1 Shown is a schematic diagram of the topology of the LCC-MMC series hybrid DC transmission system. figure 1 Medium, AC 1 For the rectifier side AC system, AC 2 and AC 3 AC system on the inverter side; PCC 1 、PCC 2 and PCC 3 AC respectively 1 、AC 2 and AC 3 The connection point with the converter station; Tie is connected to PCC 2 and PCC 3 communication lines. The rec...

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Abstract

The invention discloses a modeling method of an LCC-MMC series hybrid direct-current power transmission system, and belongs to the field of power system modeling. The LCC-MMC series hybrid direct-current power transmission system is divided into two parts, namely a main circuit and a controller, an equivalent circuit of a converter is used for replacing the converter, the equivalent circuit of themain circuit is established, and then a dynamic model of the main circuit is established by utilizing a Kirchhoff voltage law KVL and a Kirchhoff current law KCL. The equivalent circuits of the LCC and the MMC are used for replacing the LCC and the MMC for the first time, and the modeling problem of the LCC-MMC series system is solved. A dynamic model of the LCC-MMC series hybrid direct current power transmission system is a basis for establishing a steady-state model and a small-signal model of the LCC-MMC series hybrid direct current power transmission system. The whole modeling method hasthe advantages of being simple to operate and easy to expand.

Description

technical field [0001] The invention belongs to the field of power system modeling, and more specifically, relates to a LCC (Line Commutated Converter, grid commutated converter)-MMC (Modular Multilevel Converter, modular multilevel converter) series hybrid DC power transmission system modeling method. Background technique [0002] The characteristics of reverse spatial distribution of energy bases and load centers in my country have prompted an urgent need for a large-scale optimal allocation of energy resources. Due to the advantages of long-distance large-capacity transmission, DC transmission technology has played an important role in the process of optimizing the allocation of energy resources. Among them, HVDC power transmission based on grid commutation converters has the advantages of large capacity, small loss, mature technology, and low cost, but it also has the advantages of large area, inability to supply power to passive systems, and prone to commutation on the...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M7/00H02M7/483H02M7/5387G06F30/367
CPCH02J3/36H02M7/00H02M7/483H02M7/53873G06F30/367H02J2203/20Y02E60/60
Inventor 文劲宇贺永杰周家培向往赵静波
Owner HUAZHONG UNIV OF SCI & TECH
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