Boundary protection method for multi-terminal flexible DC power grid based on voltage of DC reactors

A DC reactor and DC power grid technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc., can solve problems such as high hardware requirements, rapid identification of adverse faults, complex algorithms, etc., and achieve low sampling rate requirements and reduced Hardware requirements, simple principle effect

Active Publication Date: 2018-02-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

However, the high-frequency components of this technology need to be extracted by wavelet transform, the algorithm is complex, the hardware requi...

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  • Boundary protection method for multi-terminal flexible DC power grid based on voltage of DC reactors
  • Boundary protection method for multi-terminal flexible DC power grid based on voltage of DC reactors
  • Boundary protection method for multi-terminal flexible DC power grid based on voltage of DC reactors

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Embodiment Construction

[0019] The present invention proposes a multi-terminal flexible DC power grid boundary protection method based on DC reactor voltage. The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] figure 1 , 2 , respectively represent the fault discharge circuit when a double-pole short-circuit fault and a single-pole ground fault occur on the DC transmission line; among them, figure 1 Shown is a schematic diagram of the conversion of the discharge circuit into an MMC equivalent discharge circuit when the DC line bipolar short-circuit fault occurs. R in the figure e , L e and C e are the equivalent resistance, inductance and capacitance of the MMC converter under bipolar short-circuit fault, L arm is the arm reactance, L T is the DC reactor, n is the number of sub-modules in each bridge arm of the MMC, SM1~SMn are the sub-modules in each bridge arm of the MMC converter, u C is the DC voltage, i L is th...

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Abstract

The invention discloses a boundary protection method for a multi-terminal flexible DC power grid based on voltage of DC reactors, and belongs to the technical field of power system protection. The boundary protection method is characterized in that measurement sampling is performed on voltage of each DC reactor on each DC line on the basis that both ends of each DC line in the DC power grid are provided with the DC reactor, and the measured voltage of the DC reactor is compared with a set protection start threshold to judge a line fault; DC line boundary protection is constructed by using thevoltage of the DC reactor at the single end, fast detection and recognition for a fault can be achieved according to the voltage of the DC reactor at the single end, and communication is not required.In addition, the boundary protection method is simple in theory and does not need complex algorithms, thereby recognizing a DC line fault quickly and reliably, being low in requirement for the sampling rate, not being influenced by the line distribution capacitance, being easy to implement, and greatly reducing requirements for the hardware. The boundary protection method provides an effective method for recognizing a DC fault of the multi-terminal flexible DC power grid.

Description

technical field [0001] The invention belongs to the technical field of power system protection, and in particular relates to a multi-terminal flexible DC power grid boundary protection method based on DC reactor voltage. Background technique [0002] Flexible DC transmission based on Modular Multilevel Converter (MMC) has the advantages of high modularity, flexible control of active and reactive power, and the ability to supply power to passive loads. It is widely used in wind farm grid connection and isolated islands. And weak grid power supply and urban power supply and other fields. The multi-terminal DC grid technology based on flexible DC transmission can well solve the problems of "abandoning wind" and "abandoning light" caused by new energy grid integration and consumption. Therefore, the multi-terminal flexible DC grid will play a greater role in the future power system. [0003] Fast and reliable identification of DC faults is one of the key technologies for the d...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H1/00
CPCH02H1/0007H02H7/268
Inventor 赵成勇周家培李承昱许建中安婷周啸韩丛达范征
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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