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A Fuzzy Control Method for Frequency of DC Sending Island Island System

A technology of fuzzy control and system frequency, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems of difficulty in determining the upper and lower frequency limits, simple control measures, and single judgment conditions, so as to improve the control efficiency. and frequency stability, effective and reliable control

Inactive Publication Date: 2017-04-12
SHENYANG POLYTECHNIC UNIV
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  • Abstract
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Problems solved by technology

[0004] There are three main problems in this method at this stage: First, it is not easy to determine the upper and lower limits of the frequency. Deterministic, can not guarantee the matching degree of frequency limit and frequency fluctuation; second, the judgment condition of this method is single, and the timeliness of grasping the frequency change of the system is poor, which reduces the efficiency of system frequency stability control and delays The implementation of stabilization control measures has no obvious effect on improving the stability and reliability of the system; third, the control measures of this method are relatively simple, and the frequency control effect cannot be guaranteed in the case of severe frequency fluctuations, and there is a lack of follow-up emergency frequency control measures
Based on the above reasons, this method cannot guarantee the maximum frequency control stability in engineering

Method used

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  • A Fuzzy Control Method for Frequency of DC Sending Island Island System
  • A Fuzzy Control Method for Frequency of DC Sending Island Island System
  • A Fuzzy Control Method for Frequency of DC Sending Island Island System

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Embodiment Construction

[0052] figure 1 It is an overall flow chart of a fuzzy control method for the frequency of an island system at the DC sending end. The flowchart is consistent with the basic steps of the embodiments of the present invention. It should be noted that the frequency control target of the DC island system is realized through real-time regulation, and the frequency deviation level and the DC power modulation amount only correspond to the moment when they occur, and their parameters will change with time. The features, advantages and implementation modes of the present invention will be described in further detail below in conjunction with the accompanying drawings and calculation examples.

[0053] Such as figure 1 As shown, a fuzzy control method for the frequency of an island system at the DC sending end includes the following steps:

[0054] Step 1) Extract the real-time frequency value of the island system at the DC sending end, and determine the frequency deviation level par...

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Abstract

A method for performing fuzzy control on the frequency of a direct-current sending end island system is characterized by comprising the following steps: (1) extracting a real-time frequency value of a direct-current sending end island system and determining a frequency deviation grade parameter; (2) calculating a real-time frequency change rate value of the direct-current sending end island system; (3) using a fuzzy control method to determine an adjusted frequency deviation grade parameter; (4) determining a corrected real-time frequency deviation grade parameter; (5) determining the real-time modulation quantity of direct-current power; and (6) determining a real-time direct-current power value. According to the method, the concept of frequency deviation grade is introduced, frequency fluctuation can be pre-judged by the use of the fuzzy control method based on the change of the frequency change rate, and the method has excellent timeliness and control precision and is valuable in engineering.

Description

technical field [0001] The invention relates to a power system frequency stability control method, in particular to a fuzzy control method for the frequency of an isolated island system at a DC sending end, and belongs to the technical field of power system stability control. Background technique [0002] DC islanding operation is a special form of power system operation, which is formed in the early stage of grid planning or after the splitting of AC and DC parallel transmission systems. The grid structure of the isolated island system at the DC sending end is weak, the ability to maintain frequency stability is weak, and the system frequency changes drastically. If the control measures are not appropriate, large-scale power outages are likely to occur. Since the DC sending-end island system and the main grid are only connected by the DC transmission line, how to effectively regulate and control the DC sending-end island system using the fast controllability of DC transmiss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00
Inventor 叶鹏袁林何柳武智慧张开
Owner SHENYANG POLYTECHNIC UNIV
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