A method and apparatus for calculating that lowest frequency of a power system in the absence of high power

A power system, the lowest frequency technology, applied in circuit devices, reducing/preventing power oscillations, electrical components, etc., can solve the problems of reduced anti-disturbance of power systems, serious frequency stability problems of power systems, and increased probability of high-power missing failures , to change the transient process of frequency fluctuations, reduce the complexity of the model solution, and avoid low-frequency load shedding.

Inactive Publication Date: 2019-01-11
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method and device for calculating the minimum frequency of a power system under high-power loss, aiming at solving the problem of reduced anti-disturbance of the power system, increased failure probability of high-power loss, and increasing frequency stability of the power system. serious problem

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  • A method and apparatus for calculating that lowest frequency of a power system in the absence of high power
  • A method and apparatus for calculating that lowest frequency of a power system in the absence of high power
  • A method and apparatus for calculating that lowest frequency of a power system in the absence of high power

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specific Embodiment 1

[0073] In practical applications, the power system network is composed of various units in a certain proportion, so it is necessary to improve the flexibility and diversity of frequency control.

[0074] Such as Figure 4 As shown, the embodiment of the present invention provides a method for calculating the minimum frequency of a power system under a large power loss, including:

[0075] Constructing step S101, constructing an equivalent model of the frequency response of the multi-machine system;

[0076] Step S102 is simplified once, using feedback solution loop and its linear method to solve the equivalent model of frequency response, transforming the feedback control of the multi-machine system into feed-forward control, and calculating the equivalent inertia and initial frequency drop rate of the multi-machine system;

[0077] The secondary simplification step S103 is to calculate the open-loop gain and response time of the governor model, approximately equivalent to th...

specific Embodiment 2

[0106] Such as Figure 5 As shown, the embodiment of the present invention provides a device for calculating the minimum frequency of a power system under a large power loss, including:

[0107] A construction module 201, configured to construct an equivalent model of the frequency response of the multi-machine system;

[0108] The primary simplification module 202 is used to solve the equivalent model of the frequency response by using the feedback solution loop and its linear method, transform the feedback control of the multi-machine system into the feed-forward control, and calculate the equivalent inertia and initial frequency drop of the multi-machine system rate;

[0109] The secondary simplification module 203 is used to calculate the open-loop gain and response time of the governor model, approximately equivalent to the first-order inertia link for the governors of various types of units in the multi-machine system, and then simplify the equivalent model of the frequ...

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Abstract

A method and a device for calculating that lowest frequency of a power system in the absence of high power are disclosed. The method comprises a construction step, Simplify Steps Once, Secondary Simplified Steps, Resolution Steps, Combined with the content of primary frequency modulation in frequency control system, the physical process of frequency response is analyzed, qualitative analysis of the frequency change trend after disturbance, the frequency response equivalent model of multi-machine system is constructed. Two simplification methods, frequency feedback loop decomposition and frequency response characteristic fitting, are used to simplify the complex multi-machine system. The time domain expressions of the lowest frequency and its corresponding time are derived by analytic method, Simple and practical calculation of the lowest frequency of the power system, and then through quantitative analysis to achieve better coordination with the relay protection, improve the frequencyresponse of the execution speed, change the frequency fluctuation transient process, so as to avoid the occurrence of low-frequency load shedding and other accidents, to better ensure the frequency stability of the system, to maintain the stability of the operation of the power system.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for calculating the minimum frequency of a power system under high power loss. Background technique [0002] With the gradual increase of new energy sources such as wind power and photovoltaics, the anti-disturbance of the power system is gradually reduced; in addition, the development of the UHV AC-DC hybrid power grid has led to an increase in the probability of high-power loss failures, and the frequency stability of the power system has become increasingly serious. [0003] In the absence of high power, the lowest point of frequency fluctuation is the most concerned, because it determines whether the low frequency load shedding starts or not. Due to the short period of rapid frequency drop after disturbance, if the execution speed of frequency response can be increased during this period, the transient process of frequency fluctuation can be greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J5/00
CPCH02J3/24H02J5/00H02J2203/20
Inventor 饶宇飞刘阳高昆李晓萌王建波高泽赵华王骅田春笋刘娆刘柳
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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