A Control Method of Multi-circuit DC Additional Frequency Limiting Controller

A control method and frequency limitation technology, applied in the direction of power transmission AC network, etc., can solve problems such as system current over-regulation, and achieve the effect of ensuring controllability

Active Publication Date: 2018-09-11
YUNNAN POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the embodiment of the present invention, a multi-circuit DC additional frequency limit controller control method is provided to solve the problem of system current over-regulation caused by the "swarming" control action of each DC FLC in the prior art

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  • A Control Method of Multi-circuit DC Additional Frequency Limiting Controller
  • A Control Method of Multi-circuit DC Additional Frequency Limiting Controller

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Embodiment Construction

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0029] When the DC blocking fault causes high frequency in the asynchronous network sending end system, that is, when the system frequency deviation exceeds a certain value, the non-faulty DC FLC will adopt the "stepped" method to set the DC FLC control strategy, and first adjust the transmission power of the DC system ...

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Abstract

An embodiment of the invention discloses a control method of a multi-circuit direct current additional frequency limit controller, and applicable to a multi-circuit direct current system with an asynchronous networking sending end. The control method comprises the steps of pre-setting a regulation and control initial frequency threshold value <delta>f<on> and a regulation and control ending frequency threshold value <delta>f<off>, calculating frequency deviation <delta>f, and determining whether the frequency deviation <delta>f is greater than the regulation and control initial frequency threshold value <delta>f<on> or not; and if so, reasonably setting conveying power of each-circuit direct current based on a "stepped type" control strategy specific to the multi-circuit direct current of the synchronous networking. The embodiment of the invention discloses the control method of the multi-circuit direct current additional frequency limit controller; the multi-circuit direct current additional frequency limit controller is reasonably set based on the "stepped type" control strategy; sequential regulation and control in the frequency rising process can be performed in different stages and steps; and the over-regulation problem caused by synchronous and orderless regulation and control actions of each direct current in FLC (frequency limit control) in the power grid fault condition is avoided, so that controllability on the direct current regulation and control is ensured.

Description

Technical field [0001] The invention relates to the technical field of power system stability control, in particular to a control method of a multi-circuit DC additional frequency limit controller. Background technique [0002] The HVDC system has the advantages of large capacity and long-distance power transmission. At present, my country’s "West-to-East Power Transmission" project has adopted a parallel transmission method of HVDC and AC systems. In the AC and DC parallel mode, the AC and DC systems in the grid will have mutual influence, that is, if the DC system fails, the AC system will also be affected. In order to avoid grid accidents caused by the mutual influence of AC and DC systems due to DC faults, two or more power grids can be connected asynchronously. For example, my country will realize asynchronous networking between Yunnan Power Grid and Southern Power Grid. [0003] In the asynchronous grid connection mode, if a DC blocking failure occurs, the frequency stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 李玲芳徐政钱迎春吕清洁司大军陈义宣游广增
Owner YUNNAN POWER GRID
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