Frequency control strategy for multiple DC (Direct Current) send-out island power grid

An isolated island power grid and frequency control technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as insufficient power, disintegration of power stations and systems, and increase in system frequency

Active Publication Date: 2014-03-12
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

On the one hand, due to the "12th Five-Year Plan" coming to the vision, the scale of DC in Yunnan power grid is gradually increasing, and the scale of single-circuit DC is about 5 million kilowatts. If there is excess power, the system frequency will increase; on the other hand,

Method used

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  • Frequency control strategy for multiple DC (Direct Current) send-out island power grid
  • Frequency control strategy for multiple DC (Direct Current) send-out island power grid
  • Frequency control strategy for multiple DC (Direct Current) send-out island power grid

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Embodiment Construction

[0027] Refer to attached figure 1 , to describe this method in detail:

[0028] 1） When the system frequency increases or decreases, the first line of defense is activated first, that is, the frequency limiting function (FLC control) of the DC system is used to control the system frequency. The specific control strategy of the DC frequency limiter (FLC) in the island grid with multiple DC transmissions is as follows:

[0029] 1.1） The control strategies of the DC frequency limiter and the generator governor are coordinated with each other. When the frequency stability problem of the multi-DC island grid occurs, it is first controlled by the multi-DC frequency limiter (FLC); if this method cannot control the frequency within a reasonable range, then Start generator governor control. The specific settings are: set the dead zone of the frequency limiter (FLC) to ±0.1 Hz, and the dead zone of the generator governor to ±0.5 Hz.

[0030] ） Multi-DC frequency limiter (FLC) coor...

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Abstract

The invention relates to a frequency control strategy for a multiple DC (Direct Current) send-out island power grid. The frequency control strategy comprises the following steps of: 1, for the multiple DC send-out island power grid of which the system frequency is risen or reduced due to a fault, firstly, starting a first defense line and utilizing a DC system frequency limiting function to control the system frequency; 2, when the frequency exceeds a frequency operated dead zone of a dynamo governor, starting another measure in the first defense line, i.e. carrying out primary frequency modulation control by the dynamo governor; 3, when the frequency exceeds a range of 49.0 to 50.6Hz, starting a second defense line, i.e. cutting off a generator or a load according to a control strategy; 4, when the frequency exceeds 50.6Hz, starting a third defense line and carrying out high-frequency cut-off protection to cut off a generating set; 5, when the frequency exceeds 51.5Hz, enabling the generator to execute the overspeed protection action and cutting off the generating set. The frequency control strategy can be used as an actual control strategy for stabilizing the frequency of a large-scale multiple DC send-out island system to be applied to production and operation of the power grid and also can be applied to emulation calculation of related research.

Description

technical field [0001] The invention relates to a frequency control strategy of an isolated island power grid with multiple direct current transmissions, and belongs to the technical field of power system safety and stability analysis. Background technique [0002] The characteristics of resource endowment and unbalanced economic development in the region of China Southern Power Grid determine that China Southern Power Grid needs to carry out west-to-east power transmission and cross-regional resource optimization for a long period of time. Yunnan is rich in hydropower resources. As a large-scale hydropower transmission base of China Southern Power Grid, two direct current circuits of Xiluodu and Nuozhadu will be built and put into operation in the "Twelfth Five-Year Plan". Yunnan will also plan to send 14 million kilowatts of hydropower, and eventually send DC to 8 times. In order to reduce the interaction between AC and DC in Yunnan Power Grid, especially the power angle ...

Claims

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Application Information

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IPC IPC(8): H02J1/00
Inventor 周保荣李蓉蓉洪潮陈建斌张东辉黄东启
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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