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A Modeling Method for LCC-MMC Series Hybrid DC Transmission System

A hybrid DC and power transmission system 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 been reported yet, and achieve the effect of easy expansion and simple operation

Active Publication Date: 2022-01-11
HUAZHONG UNIV OF SCI & TECH +2
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  • Abstract
  • Description
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  • Application Information

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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 connected in series, and it is difficult to establish its small-signal model. , so far, the small-signal model of the LCC-MMC series hybrid DC transmission system has not been reported

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  • A Modeling Method for LCC-MMC Series Hybrid DC Transmission System
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  • A Modeling Method for LCC-MMC Series Hybrid DC 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 transmission system, which belongs to the field of power system modeling. In the present invention, the LCC-MMC series hybrid direct current transmission system is divided into two parts, the main circuit and the controller. First, the equivalent circuit of the converter is used to replace the converter, and the equivalent circuit of the main circuit is established. The voltage law KVL and Kirchhoff's current law KCL establish a dynamic model of the main circuit. For the first time, the equivalent circuits of LCC and MMC are used to replace LCC and MMC, and the modeling problem of LCC-MMC series system is solved. The dynamic model of the LCC-MMC series hybrid DC transmission system is the basis for establishing its steady-state model and small-signal model. The whole modeling method has the advantages of simple operation and easy expansion.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M7/00H02M7/162H02M7/483H02M7/521G06F30/20
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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