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A Real-time Online Prediction Method of Characteristic Parameters of AC Microgrid

A micro-grid and prediction method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as difficult to meet the online analysis of micro-grid stability

Active Publication Date: 2016-06-29
FUJIAN NEBULA ELECTRONICS CO LTD
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Problems solved by technology

Therefore, in the microgrid system under disturbance conditions, the stability analysis method based on parameters and models has great limitations, and the existing research results are difficult to meet the needs of online analysis of microgrid stability

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  • A Real-time Online Prediction Method of Characteristic Parameters of AC Microgrid

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the drawings.

[0045] Such as figure 1 As shown, the present invention provides a real-time online prediction method of AC micro-grid characteristic parameters, including the following steps:

[0046] 1) Real-time acquisition of the disturbance current value I of a disturbed node of the AC microgrid system with frequency ω k , The sampling interval is T s =0.1ms; According to the collected disturbance current value I k , Construct the array of disturbance current values ​​ARRAY[I 1 , I 2 , I 3 , I 4 , I 5 , I 6 ], and the initial value of each element in the perturbation current value array ARRAY is 0. For each point collected, let I 6 =I k ; I 5 =I 6 ; I 4 =I 5 ; I 3 =I 4 ; I 2 =I 3 ; I 1 =I 2 ; K is a positive integer;

[0047] 2), real-time calculation of the fifth-order differential derivative of the current value in the disturbance current value array ARRAY: if the first-order differential deriva...

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Abstract

The invention discloses a real-time on-line predicting method of alternating current miniature electric network characteristic parameters. The method comprises the following steps that 1) the disturbance current value Ik of a disturbed node of an alternating current miniature electric network system is collected in real time, the sampling time interval is Ts, and according to the collected disturbance current value Ik, a disturbance current value array [I1, I2, I3, I4, I5, I6] is built; 2) the five-order differential derivative of the current value in the disturbance current value array is calculated in real time: if the one-order differential derivative f(1) is greater than Epsilon, the condition that the alternating current miniature electric network system enters a transient process is judged, if each order derivative is smaller than the preset micro quantity Epsilon, the condition that the alternating current miniature electric network system is stable is judged, the current value at the next moment is continuously collected, and in addition, the five-order differential derivative of the current value at the next moment is continuously calculated. Compared with the prior art, the method has better real-time performance, simplicity and convenience, and can be applied to various fields of transient impact current inhibition, motor parameter on-line testing, failure on-line diagnosis, low-frequency power oscillation on-line detection and inhibition and the like.

Description

Technical field [0001] The invention belongs to the research field of power quality and signal analysis and processing, and specifically relates to a real-time online prediction method of AC micro-grid characteristic parameters. Background technique [0002] Micro-grid is the most effective measure to realize distributed application of new energy, and it is also the main content of future interactive smart grid. The system integrates distributed energy sources such as wind power, photovoltaics, and fuel cells through a large number of power electronic interface circuits. It uses energy storage devices such as batteries, supercapacitors, and high-speed flywheels as power adjustment methods. The central control system and distributed control of the microgrid Under the coordinated action of the system and the protection device, the local load is provided with clean, continuous and interactive electric energy through the micro local power supply network. [0003] By analyzing the syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 卓放熊连松李琛谢亦丰祝明华
Owner FUJIAN NEBULA ELECTRONICS CO LTD
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