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A Real-time Online Prediction Method of Characteristic Parameters of DC Micro-grid

A technology of micro-grid and characteristic parameters, applied in the direction of measuring electricity, measuring device, measuring electrical variables, etc., can solve the problem that it is difficult to meet the on-line analysis of micro-grid stability.

Active Publication Date: 2016-06-29
XI AN JIAOTONG UNIV
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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 DC Micro-grid

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 As shown, the present invention provides a real-time online prediction method of DC micro-grid characteristic parameters, comprising the following steps:

[0043] 1) Real-time acquisition of the disturbance current value I of a disturbed node in the DC microgrid system k , the sampling interval is T s =0.01s; according to the collected disturbance current value I k , to construct the disturbance current value array ARRAY[I 1 , I 2 , I 3 , I 4 , I 5 ], and the initial value of each element in the disturbance current value array ARRAY is 0, each time a point is collected, let I 5 = I k ; I 4 = I 5 ; I 3 = I 4 ; I 2 = I 3 ; I 1 = I 2 ;

[0044]2) Real-time calculation of the fourth-order differential derivative of the current value in the disturbance current value array ARRAY: if the first-order differential derivative f (1) is...

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Abstract

The invention discloses a real-time on-line prediction method for characteristic parameters of a direct current micro grid. The method comprises the following steps of 1) acquiring a disturbance current value Ik of a disturbed node of a direct current micro grid system in real time at a sampling time interval of Ts, and constructing a disturbance current value ARRAY[I1, I2, I3, I4 and I5] according to the acquired disturbance current value Ik; 2) calculating four order differential derivatives of current values in the disturbance current value ARRAY in real time, i.e. judging that the direct current micro grid system enters a transient process if a first-order differential derivative f(1) is greater than epsilon; or judging that the direct current micro grid system is stable if each order differential derivative is smaller than the preset minute quantity epsilon, continuously acquiring a current value at the next moment, and continuously calculating four order differential derivatives of the current value at the next moment. Compared with the prior art, the method has higher real-time and simplicity, and can be applied to multiple fields such as inhibition of transient impulse current, on-line detection of motor parameters, on-line diagnosis of faults, and on-line detection and inhibition of low-frequency chugging.

Description

technical field [0001] The invention belongs to the research field of power quality and signal analysis and processing, and in particular relates to a real-time online prediction method for characteristic parameters of a direct current micro-grid. Background technique [0002] Microgrid is the most effective measure to realize the 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, and uses energy storage devices such as batteries, supercapacitors, and high-speed flywheels as power adjustment methods. Under the coordination of the system and protection devices, clean, continuous and interactive power is provided to local loads through the micro-local power supply network. [0003] By analyzing the system structure, networking mode, operation mode, and control str...

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 XI AN JIAOTONG UNIV
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