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Method for inhibiting fluctuation of random power of alternative-current junctor

A technology of AC tie line and power fluctuation, which is applied in the field of power system and can solve problems affecting economy and so on

Active Publication Date: 2014-03-19
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By improving the AGC control strategy, the power fluctuation of the tie line can be reduced to a certain extent. However, the AGC control effect is not only affected by the frequency deviation coefficient, but also depends on the number of frequency modulation units, start-stop time, ramp rate, rotation Reserve capacity and other performance, in order to obtain a better power fluctuation suppression effect, it is necessary to invest more high-performance AGC units, which will inevitably affect the economy of operation

Method used

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  • Method for inhibiting fluctuation of random power of alternative-current junctor
  • Method for inhibiting fluctuation of random power of alternative-current junctor
  • Method for inhibiting fluctuation of random power of alternative-current junctor

Examples

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Embodiment 1

[0053] Embodiment 1 provided by the present invention takes the 2012 North China-Central China Networking Xiada method as an example to illustrate that random power fluctuations in AC connections can be suppressed by modulating DC power. In this way, the Central China Power Grid transmits 5000MW of power to the North China Power Grid through the UHV tie line, and the AGC adopts a constant power control mode.

[0054] Step S1': Determine the design target of the DC power modulation controller according to the set transfer ratio r.

[0055] In this embodiment, the realization of the transfer ratio r=50% is taken as an example, that is, the power fluctuation is shared between the AC tie line and the DC tie line at a ratio of 50%, then the design goal of the controller is

[0056] Step S2': According to the time constant T of the measurement link and the DC blocking link mes and τ w And the control gain K of the gain link DC and modulating signal P T Determine the model of t...

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Abstract

The invention provides a method for inhibiting fluctuation of random power of an alternative-current junctor, which is characterized by changing the power of a liner circuit through establishing a direct-current modulation controller so as to transfer the fluctuation of the random power on the alternative-current junctor. The method comprises following steps that step S1: a design target of the direct-current power modulation controller is determined according to a set transferring ratio r, wherein the transferring ratio r is a previously-set ratio for the direct-current junctor to share the fluctuation of the random power on the alternative-current junctor according to needs, sigma () is a standard difference function of a signal; sigma (PT) is a standard difference of the alternative-current junctor power PT; and sigma (PDC) is a standard difference of the direct-current circuit power PDC; and step 2: the direct-current power modulation controller comprises a measurement link, a blocking link and a gain link, the modulation signal is the power PT of the alternative-current junctor, and a model of the direct-current power modulation controller is determined according to the time constant Tmes and tw of the measurement link and the blocking link as well as the control gain KDC of the gain link and the modulation signal PT. The method has an important significance for guaranteeing the safe and stable operation of an extreme high voltage synchronization power grid.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for suppressing random power fluctuations of AC tie lines. Background technique [0002] In January 2009, the Changzhi-Nanyang-Jingmen UHV AC test and demonstration project was officially put into operation. The line connects the two major regional power grids in North China and Central China, forming the largest AC synchronous power grid in my country. In December 2011, the expansion project of the UHV AC test demonstration project was put into operation, achieving the goal of a transmission capacity of 5 million kilowatts for a UHV AC line. [0003] In the early stage of UHV power grid construction, the grid structure was weak, and the North China Power Grid and Central China Power Grid were only interconnected through UHV tie lines. Due to the large range of power exchange between grids and system load changes, there was a certain magnitude of fluctuations on the UHV tie ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 何剑孙华东郭剑波卜广全
Owner STATE GRID CORP OF CHINA
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