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Coordination control method for low-frequency off-network and three defense lines of power system

A technology of three lines of defense and coordinated control, applied in the field of power system, can solve the problems of insufficient backup, low-frequency suspension, and insufficient prevention and control of the stability control strategy, and achieve the effect of solving the shortage of backup

Pending Publication Date: 2022-04-15
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the above existing technologies, the purpose of the present invention is to provide a coordinated control method for low-frequency off-grid and three lines of defense in the power system, so as to solve the possible backup shortage and stable control strategy after large-scale new energy access Low-frequency suspension problems caused by inadequate prevention and control

Method used

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  • Coordination control method for low-frequency off-network and three defense lines of power system
  • Coordination control method for low-frequency off-network and three defense lines of power system
  • Coordination control method for low-frequency off-network and three defense lines of power system

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Embodiment

[0037] figure 2 It is a flowchart of an embodiment of the present invention. In this embodiment, a coordinated control method for low-frequency off-grid and three lines of defense in a power system, the process is as follows:

[0038] Step 1: Monitor the fundamental frequency of the voltage at the installation point in real time through the low-frequency off-grid device, and calculate the deviation of the fundamental frequency. The calculation formula is;

[0039]

[0040] in, is the fundamental frequency deviation of installation point k at time t, f 0 is the fundamental standard frequency, in this embodiment, f 0 Take 50Hz, is the measured value of the fundamental frequency of installation point k at time t;

[0041] Step 2: If the frequency fluctuation is very small, for example, the system frequency remains above 49.967Hz, all devices involved in frequency modulation will not operate, and the system will run normally;

[0042] Step 3: If the frequency fluctuati...

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Abstract

The invention discloses a coordinated control method for low-frequency off-network and three defense lines of a power system, and the method comprises the following steps: S1, monitoring the voltage fundamental frequency of an installation point in real time through a low-frequency off-network device, and obtaining the fundamental frequency deviation value of the installation point at the current moment according to the monitored voltage fundamental frequency of the installation point; and S2, according to the obtained fundamental wave frequency deviation value of the installation point at the current moment, realizing coordination control of a low-frequency off-network device and three defensive lines for processing frequency reduction caused by power shortage.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a coordinated control method for low-frequency off-grid and three lines of defense in electric power systems. Background technique [0002] With the gradual increase in the proportion of new energy access, its randomness and volatility pose new challenges to the safe and stable operation of the power system, especially in terms of frequency stability. [0003] The existing power system’s methods to deal with the problem of frequency drop caused by power shortage mainly include: ① For situations where frequency fluctuations are not large, such as load fluctuations or small power fluctuations of new energy units, primary and secondary frequency regulation, DC FLC (Frequency Limit Controller) , frequency limiter) and other automatic adjustment control devices, that is, the first line of defense; ②For the case of power loss caused by large disturbances, the second line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCY02B70/3225Y04S20/222
Inventor 吴小珊吴为周保荣
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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