Compact modularized multi-level tripolar direct-current power transmission system

A modular multi-level, DC power transmission system technology, applied in the direction of AC power input conversion to DC power output, power transmission AC network, electrical components, etc., to achieve good engineering application value, small footprint, and low overall transformation cost Effect

Inactive Publication Date: 2014-08-06
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a compact modular multi-level three-pole direct current transmission system to overcome the defects of the above-mentioned prior art, to solve the shortcomings of the three-pole direct current transmission based on LCC-HVDC, and to meet the needs of cities with tight land resources. Transformation of AC lines into DC transmission lines in the power supply system requires

Method used

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  • Compact modularized multi-level tripolar direct-current power transmission system
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  • Compact modularized multi-level tripolar direct-current power transmission system

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Embodiment 1

[0031] figure 2 Shown is a typical three-phase six-arm MMC structure diagram, in figure 2 On the basis of the MMC structure, one phase bridge arm is added to form a four-phase eight-arm converter, and a four-phase eight-arm converter is installed in the rectifier station and the inverter station respectively to connect with three DC lines to realize three-pole Direct current transmission, the specific scheme is as follows:

[0032] Such as image 3 As shown, a compact modular multi-level three-pole DC power transmission system realizes three-pole DC power transmission, including rectification side subsystem A, DC line and inverter side subsystem B connected in sequence, and the DC line includes three wires , are pole 1 DC line, pole 2 DC line and pole 3 DC line respectively; the rectification side subsystem A and the inverter side subsystem B both include a converter transformer a and a converter b, and the converter b is four Eight-phase modular multilevel converter (MMC...

Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 is that the DC line is an overhead line. Since the overhead line has a high probability of temporary faults, if the fault is cleared by tripping the AC side switch, the power outage time will be longer, affecting the availability of the entire system. Therefore, the fault on the DC side needs to be cleared through the control of the converter itself. For this reason, the sub-module of the modular multilevel rectifier adopts a clamping double sub-module structure, including two clamping sub-modules. The specific structure of the clamp sub-module is as follows Figure 5 As shown, each clamping twin sub-module is composed of the first equivalent half-bridge unit and the second equivalent half-bridge unit connected in series and parallel through the clamping diodes D6, D7 and the guiding IGBT (T5) with the anti-parallel diode D5; the first The collector of the first IGBT (TI) is connected to one end of the first capaci...

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Abstract

The invention relates to a compact modularized multi-level tripolar direct-current power transmission system, wherein according to the system, tripolar direct-current power transmission is achieved. The system comprises a rectification side subsystem, direct-current circuits and an inversion side subsystem, wherein the rectification side subsystem, the direct-current circuits and the inversion side subsystem are sequentially connected. The direct-current circuits include three wires, namely, a first-pole direct-current circuit, a second-pole direct-current circuit and a third-pole direct-current circuit. The rectification side subsystem and the inversion side subsystem respectively comprises a converter transformer and a converter, each converter is a four-phase eight-bridge-arm modularized multi-level converter, the middle point of a first phase, the middle point of a second phase and the middle point of a third phase of the converter are respectively connected with an auxiliary side of a winding of the converter transformer, the middle point of the fourth phase of the converter is connected with the third-pole direct-current circuit through a smoothing reactor, the positive pole of the converter is connected with the first-pole direct-current circuit through the smoothing reactor, and the negative pole of the converter is connected with the second-pole direct-current circuit through the smoothing reactor. Compared with the prior art, the system has the advantages that the occupied area of a converter station is small and the overall modification cost is low.

Description

technical field [0001] The invention relates to direct current transmission technology, in particular to a compact modular multilevel three-pole direct current transmission system. Background technique [0002] With the sustained and rapid development of my country's economy, the contradiction of power demand has become increasingly prominent. On the one hand, the growth of power load exceeds the transmission capacity of the original AC transmission line, and it is difficult to obtain a new transmission corridor due to land resources constraints; The maximum thermal power that the wire can withstand is less, so it is necessary to adopt new technology to further tap the power transmission potential of the existing line. [0003] Compared with AC transmission, with DC transmission, the line current can reach the maximum thermal limit that the wire can withstand. In 2004, Barthold LO proposed a three-pole DC transmission technology that uses DC current modulation to convert A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M7/483H02M7/5387H02M7/219
CPCY02E60/60
Inventor 胡铭王之浩田杰崔勇邵震霞焦鑫艳
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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