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An AC fault location method applied to a four-terminal wind power DC grid

A DC power grid and fault location technology, which is applied to fault locations, power transmission AC networks, and AC networks with the same frequency from different sources, can solve problems such as fault location of multi-terminal bipolar DC power grids, and achieve fewer detection indicators and faster calculations. easy effect

Active Publication Date: 2021-02-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the defects and improvement needs of the prior art, the present invention provides an AC fault location method applied to a four-terminal wind power DC grid. Technical Problems of Fault Location in Multi-terminal Bipolar DC Grid

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  • An AC fault location method applied to a four-terminal wind power DC grid
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  • An AC fault location method applied to a four-terminal wind power DC grid

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Embodiment Construction

[0036]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.

[0037] figure 1 Shown is the topology of a four-terminal wind power DC grid. Wind farms 1 and 2 use permanent magnet synchronous generators (PMSG) to output rated power of 1500MW and 3000MW respectively. Each PMSG is connected to a back-to-back full power converter, which consists of a generator side VSC (generator side VSC, GS VSC) and a grid side VSC (integration side VSC, IS VSC). In the DC...

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Abstract

The invention discloses an AC fault location method applied to a four-terminal wind power DC grid. The method includes: S1: detecting the DC port voltage of each converter station. If the DC voltage exceeds the normal operation threshold, it is judged that the wind power If an AC fault occurs at the converter station at the receiving end of the DC power grid, go to step S2, otherwise continue to detect; S2: Calculate the power flow transfer entropy H of the line 1 and the line 4 OL1 and H OL4 , if the difference ΔH of the power flow transfer entropy of line 1 and line 4 OL14 <0, it is determined that the grid-side converter station GSMMC2 has an AC fault, and then go to step S3; if ΔH OL14 >ΔH th , then it is determined that an AC fault has occurred in the grid-side converter station GSMMC1, and then go to step S3, where ΔH th is the upper limit threshold; S3: put into the energy consumption resistance device to absorb the unbalanced power during the system failure, so as to restore the system to normal operation. In this way, the present invention can quickly and accurately locate the AC fault location of the wind power DC grid, and the proposed fault location method has fewer detection indicators, simple calculation, and no need for setting calculations.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution of power systems, and more specifically relates to an AC fault location method applied to a four-terminal wind power DC grid. Background technique [0002] With the demand for new energy power generation and the development of DC transmission technology, flexible DC transmission technology is currently widely considered to be one of the effective methods suitable for grid-connected collection and long-distance wind power transmission. In order to further improve the reliability and economy of system operation, and realize the multi-regional collection, reasonable distribution and consumption of wind power, the multi-terminal wind power DC grid based on MMC (modular multilevel converter) has received extensive attention. [0003] Multi-terminal wind power adopts DC networking. Although it can improve system operation efficiency and reduce unit transmission costs, due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08H02J3/36H02J3/24H02J3/06
CPCG01R31/086G01R31/088H02J3/06H02J3/24H02J3/36Y02E60/60Y04S10/52
Inventor 文劲宇曹帅向往周猛鲁晓军
Owner HUAZHONG UNIV OF SCI & TECH