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DC energy consumption device and DC protection cooperation method

A technology of energy-consuming devices and coordinating devices, which is applied in the direction of circuit devices, output power conversion devices, wind power generation, etc., can solve problems such as no offshore construction projects, and achieve the effects of improving reliability, preventing blocking, and reducing the frequency of switching on and off

Active Publication Date: 2020-12-25
XUJI GRP +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

my country has some experience in the construction and operation of flexible DC projects, but there are no offshore construction projects

Method used

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  • DC energy consumption device and DC protection cooperation method
  • DC energy consumption device and DC protection cooperation method
  • DC energy consumption device and DC protection cooperation method

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Embodiment Construction

[0049] 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 combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0050] The present invention provides a method for coordinating DC energy consumption devices and DC protection in offshore wind power flexible DC transmission projects. The basic idea adopted is: firstly, the DC protection partitions of offshore wind power flexible DC transmission projects including DC energy consumption devices are determined, The protection of DC energy-consuming devices in onshore converter stations i...

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Abstract

The invention relates to a DC energy consumption device and DC protection cooperation method in an offshore wind power flexible DC sending-out project, and the method comprises the steps: firstly determining a DC protection subarea of the offshore wind power flexible DC sending-out project comprising a DC energy consumption device, and dividing the protection of the DC energy consumption device ofan onshore converter station into a DC electrode protection area; and researching the cooperation strategy of the on-off voltage value of the direct-current energy consumption resistor, direct-current overvoltage protection and direct-current low-voltage protection, and the cooperation strategy of on-off of the direct-current energy consumption resistor and direct-current pole bus differential protection emphatically. The switching frequency of the direct-current energy consumption resistor is reduced by setting a threshold value, the impact of switching of the direct-current energy consumption resistor on a system is greatly reduced, the loss of converter station locking, fan off-grid and power grid power failure caused by power grid side faults is effectively prevented, and the reliability of offshore wind power flexible direct-current delivery engineering is further improved.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission protection, in particular to a method for coordinating a direct current energy consumption device and direct current protection of an offshore wind power flexible direct current transmission project. Background technique [0002] Today, the uncertainty of fossil energy is exhausted, and environmental problems are becoming more and more serious. In the future, the proportion of renewable clean energy connected to the grid will inevitably increase significantly. Wind power generation is one of the most mature and potential power generation methods in new energy power generation technologies. After several years of development, offshore wind power has become an important part of renewable energy. According to statistics, the proportion of offshore wind power has increased from less than 2% to nearly 20% in the past decade. [0003] The flexible DC transmission technology based on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02J3/36H02J3/38
CPCH02M1/32H02J3/36H02J3/381H02J2300/28Y02E10/76Y02E60/60
Inventor 付艳戴国安倪传坤孙巍峰周晓风崔晨李传西李星奎康建爽李卓凡
Owner XUJI GRP
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