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Active power control method during fault of converter, and flexible direct current power grid

A technology of active power and control method, applied in the direction of power transmission AC network, reducing/preventing power oscillation, etc., can solve the problem of low efficiency of active power balance

Inactive Publication Date: 2018-08-17
XJ ELECTRIC +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an active power control method and a flexible DC power grid when a converter fails, which is used to solve the problem of low active power balance efficiency when the grid converter fails in the prior art

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  • Active power control method during fault of converter, and flexible direct current power grid
  • Active power control method during fault of converter, and flexible direct current power grid
  • Active power control method during fault of converter, and flexible direct current power grid

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Embodiment Construction

[0052] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0053] A flexible DC power grid, including a converter station active power coordination control system, at least two sending-end converter stations and at least two receiving-end converter stations, the sending-end converter stations are all in active power control mode; the receiving-end converter station One of the converter stations is in the DC voltage control mode, and the remaining receiving-end converter stations are in the active power control mode. The converters of each converter station are connected to the converter control system correspondingly, and the active power of the converter stations is coordinated and controlled The system is connected to each converter station through optical fiber communication.

[0054] When the positive converter or the negative converter in each sending-end converter station or each receiving-end conve...

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Abstract

The invention provides an active power control method during a fault of a converter, and a flexible direct current power grid. The method includes: obtaining an active power reference value and an active power restriction value corresponding to a positive electrode converter or a negative electrode converter of each converter station; calculating a maximum value of the active power transferred bythe negative electrode converter or the positive electrode converter of each converter station, received by the positive electrode converter or the negative electrode converter of each converter station; and re-distributing the active power reference values of the positive electrode converter and the negative electrode converter of each converter station according to the maximum value of the active power. When any converter is withdrawn due to the fault, in order to avoid the over-voltage or under-voltage condition of the power grid and lose the active power of the power grid as less as possible, a converter active power control system re-calculates the active power reference value of each converter, the active power of the power grid is re-distributed, the direct current voltage of the flexible direct current power grid can be rapidly stabilized, the utilization rate of the active power of the flexible direct current power grid system can be improved, and the power flow of the flexible direct current power grid system can be optimized.

Description

technical field [0001] The invention belongs to the technical field of flexible DC grid systems, and in particular relates to an active power control method and a flexible DC grid when a converter fails. Background technique [0002] DC transmission is considered to be the development direction of power transmission in the future. Compared with AC transmission system, DC system has high stability and low transmission loss. Especially with the development of high-voltage and large-capacity power devices and the realization of high-voltage DC circuit breakers, DC power grid has been With the technical basis to replace the AC power grid, the current DC transmission includes two technical routes, one is the thyristor-based current source high-voltage direct current transmission technology (LCC-HVDC), and the other is based on the modular multi-level Cascaded converter voltage source high-voltage direct current transmission technology (VSC-HVDC), also known as flexible direct cur...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/24H02J3/36Y02E60/60
Inventor 宋延涛陈大鹏许梦阳岳笑歌王胜周晓风王世标苏进国张群曹森戴国安刘旭辉李乾孔令凯吴东崛
Owner XJ ELECTRIC
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