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Power system inertia real-time evaluation method based on ARMAX system identification

A power system and system identification technology, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems that the accuracy is greatly affected, and achieve the effect of improving accuracy, improving accuracy, and reducing errors

Pending Publication Date: 2020-06-16
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Therefore, for the conventional method of using the zero-time impulse response value to determine the inertia time constant, the order of the ARMAX identification model has a great influence on the accuracy of inertia evaluation

Method used

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  • Power system inertia real-time evaluation method based on ARMAX system identification
  • Power system inertia real-time evaluation method based on ARMAX system identification
  • Power system inertia real-time evaluation method based on ARMAX system identification

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Embodiment

[0034] Such as figure 1 As shown, a real-time evaluation method of power system inertia based on ARMAX system identification is based on the following steps:

[0035] (1) Obtain active power and frequency fluctuations at the outlet side of each generator or wind farm during normal operation of the power grid;

[0036] (2) Taking active power change as input and frequency change as output, use ARMAX system identification technology to build an ARMAX identification model from active power change to frequency change;

[0037] (3) Calculate the frequency change rate after the step response of the ARMAX identification model;

[0038] (4) Substitute the frequency change rate after the step response into the rocking equation to obtain the inertial time constant.

[0039]Step (2) build ARMAX identification models of different orders, and then step (3) calculate the frequency change rate after the step response of ARMAX identification models of different orders respectively, step (4)...

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Abstract

The invention relates to a power system inertia real-time evaluation method based on ARMAX system identification. The method is based on the following steps: (1) obtaining active power and frequency fluctuation of outlet sides of generators and a wind power plant when a power grid operates normally; (2) taking the active power change as input and the frequency change as output, and constructing anARMAX identification model from the active power change to the frequency change; (3) calculating a frequency change rate after step response of the ARMAX identification model; and (4) substituting the frequency change rate after the step response into a swing equation to obtain an inertia time constant. Compared with the prior art, the method provided by the invention has the advantages that dynamic changes of inertia of the power system in different operation states can be accurately reflected; an auxiliary decision is provided for stable operation of a power grid and grid connection of newenergy; an evaluation result can be updated in real time according to measured data; and understanding of potential unstable risks of the power system and stable operation maintaining capability afteraccidents are facilitated.

Description

technical field [0001] The invention relates to a real-time evaluation method of power system inertia, in particular to a real-time evaluation method of power system inertia based on ARMAX system identification. Background technique [0002] Inertia is an inherent property of the power system, which is the impedance of the system to frequency fluctuations caused by disturbances, and is the basic guarantee for the safe and stable operation of the system. Inertia is a parameter that measures the ability of a power system to absorb or inject active power after being disturbed due to inertia. When the power system operates stably, the system frequency needs to be maintained within a certain range. When the system is disturbed by a certain size, the system frequency change is affected by the system inertia time constant H. The larger H is, the smaller the system frequency change rate is, and the slower the system frequency drops, the more time is gained for a frequency modulatio...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/24H02J3/38G06F30/20G06F113/04
CPCH02J3/00H02J3/24
Inventor 徐波章林炜边晓燕李东东
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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