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Modular multi-level multi-terminal flexible direct current system direct current fault handling method

A modular multi-level, multi-terminal flexible technology, applied in the direction of electrical components, emergency protection circuit devices, etc., can solve the problem of fault recovery without considering temporary DC faults, large flexible DC topology, and does not involve multi-terminal system fault handling Methods and other issues, to achieve the effect of simple and easy troubleshooting, protection of equipment safety, and timeliness

Active Publication Date: 2015-01-21
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the solution fails, it is handled as a permanent DC fault, and does not involve the fault handling method of the multi-terminal system
At the same time, this method changes the flexible straight topology greatly, and is not suitable for modular multilevel topology
[0006] The above two methods are based on the fault handling process of the converter stations at both ends, and neither takes into account the fault recovery problem of temporary DC faults

Method used

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  • Modular multi-level multi-terminal flexible direct current system direct current fault handling method

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Embodiment Construction

[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] In this embodiment, aiming at the temporary DC fault problem of the multi-terminal flexible DC system, a method for handling the DC fault of the multi-terminal flexible DC system is given.

[0040] In the multi-terminal flexible DC system of this embodiment, taking three terminals as an example, three groups of relays (S 1-1 , S 1-2 ), (S 2-1 , S 2-2 ) and (S 3-1 , S 3-2 ) and three groups of corresponding relay protection devices (which can be relays), one relay and the corresponding relay protection device of each group are set at the DC end of the flexible DC system, and the other relay and the corresponding relay protection device are set at the DC end On the line, the relays set on the same DC line are placed together. Such as figure 2 and image 3 The system shown, where the relays of the two DC lin...

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Abstract

The invention provides a modular multi-level multi-terminal flexible direct current system direct current fault handling method which comprises the following steps that (1) a relay protection device detects a multi-terminal flexible direct current system in real time, if a direct current fault point is detected, breakers at two ends of a direct current line are switched off, and converters of stations are kept in a running state; (2) the switched-off breakers are switched on, whether the fault disappears is detected, if the fault does not disappear, the breakers are switched off again, and if the fault disappears, a step (3) is carried out; (3) the direct current line is used, and the system runs normally. The modular multi-level multi-terminal flexible direct current system direct current fault handling method is simple, easy to implement and reliable, influences on a plurality of converter stations of temporary direct current faults are reduced, timely recovery and running of the system after the temporary direct current faults are removed are guaranteed effectively, and device running safety is guaranteed at the same time.

Description

technical field [0001] The invention belongs to the technical field of flexible DC power transmission in power systems, and in particular relates to a DC fault processing method for a modularized multi-level multi-terminal flexible DC system. Background technique [0002] The Modular Multilevel Converter (MMC) used for flexible DC transmission adopts a new modular multilevel topology that is currently popular in the world. It is a newly emerging voltage source converter suitable for flexible DC transmission technology. It has low requirements for dynamic voltage equalization, good scalability, high-quality output voltage waveform, low switching frequency, and low operating loss. advantage. Modular multi-level flexible DC transmission has stronger advantages than the traditional thyristor-based DC transmission system in establishing a multi-terminal system, such as fundamentally eliminating commutation failure, and the remaining stations can operate normally after one statio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 林畅贺之渊孔明杨杰朱琳包海龙刘隽
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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