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A Voltage Phase Detection Algorithm Based on Strong Tracking Kalman Filter

A Kalman filter and voltage phase technology, applied in the field of power electronics, can solve the problem that PLL detection accuracy and response speed cannot meet the requirements at the same time, and achieve the effect of improving dynamics

Active Publication Date: 2020-12-18
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a voltage phase detection algorithm based on a strong tracking Kalman filter, which solves the problem that the detection accuracy and response speed of the traditional PLL cannot meet the requirements at the same time, and the applicable conditions are wider

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  • A Voltage Phase Detection Algorithm Based on Strong Tracking Kalman Filter
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  • A Voltage Phase Detection Algorithm Based on Strong Tracking Kalman Filter

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Embodiment Construction

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

[0042] The present invention is a voltage phase detection algorithm based on strong tracking Kalman filter, the working principle is as follows figure 1 As shown, the specific steps are as follows:

[0043] Step 1, the detected three-phase voltage U a , U b , U c Transform to the two-phase rotating xy coordinate system with angular velocity ω=100πrad / s, and get the transformation result U x and U y ;

[0044]

[0045] In the formula: t is time;

[0046] Step 2, the U obtained by step 1 x and U y Apply a low-pass filter to extract the positive sequence fundamental wave voltage component U x + and U y + ;

[0047] Step 3, the U obtained by step 2 x + and U y + Transform to the two-phase static αβ coordinate system, and get the transformation result U α + and U β + ;

[0048]

[0049] In the formula:

[0050] Ste...

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Abstract

The invention discloses a strong tracking Kalman filter-based voltage phase detection algorithm. The algorithm specifically comprises the steps of 1, transforming detected three-phase voltages Ua, Uband Uc to a two-phase rotation xy coordinate system with an angular speed omega of 100pi rad / s to obtain Ux and Uy; 2, extracting positive sequence fundamental voltage components Ux+ and Uy+ from Ux and Uy by applying a low-pass filter; 3, transforming Ux+ and Uy+ to a two-phase stationary alpha beta coordinate system to obtain Ualpha+ and Ubeta+; 4, taking Ux in the step 1 as an input signal, designing STKF for detecting a sudden change of the input signal, and obtaining a gain factor K reflecting the sudden change of the signal; and 5, introducing the gain factor K into a phase calculation process. An improved synchronous coordinate system phase-locked loop is applied to Ualpha+ and Ubeta+ in the step 3 to obtain voltage phases. According to the method, the problem that a conventional PLL cannot meet the demands in detection precision and response speed at the same time is solved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a voltage phase detection algorithm based on a strong tracking Kalman filter. Background technique [0002] Since the industrial revolution in the 18th century, the extensive use of fossil energy such as oil, natural gas, and coal has brought many problems to human society, such as energy crisis and global warming. Therefore, seeking clean and renewable energy has become a more important way at present. Among the currently applied renewable clean energy, solar energy has been widely developed and applied due to its advantages of abundant resources, cleanness, easy expansion of photovoltaic modules, and low cost. [0003] Solar energy is connected to the grid through a grid-connected inverter. In order to achieve stable grid-connected photovoltaics and inject electric energy with unit power factor into the grid, it is necessary to synchronize the grid-connec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 张晓滨苏战停黄佳敏何瑞张海英
Owner XIAN UNIV OF TECH
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