A Control Method for Photovoltaic Inverter Regulator with Linear Frequency Locked Loop

A control method and frequency-locked loop technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of complex implementation and low control accuracy of the regulator, and achieve the effect of improving filtering accuracy and speed.

Inactive Publication Date: 2016-08-17
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to apply frequency-locked loop synchronization technology to solve the photovoltaic grid-connected with linear frequency-locked loop that exists in the prior art under the condition of grid voltage distortion of the photovoltaic grid-connected inverter with low control accuracy and complex problems. Inverter Regulator Control Method

Method used

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  • A Control Method for Photovoltaic Inverter Regulator with Linear Frequency Locked Loop
  • A Control Method for Photovoltaic Inverter Regulator with Linear Frequency Locked Loop
  • A Control Method for Photovoltaic Inverter Regulator with Linear Frequency Locked Loop

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Embodiment Construction

[0026] The steps of the present invention are:

[0027] Step 1: In the DSP control circuit, the grid three-phase voltage u a , u b , u c Converted by clarke transform to , ,in , are the α-axis and β-axis components in the two-phase stationary coordinate system; the calculation formula

[0028]

[0029] Step 2: Sum the SOGI split terms of the classic second-order generalized integrator to obtain a simplified first-order generalized integrator

[0030]

[0031] Where k is the gain coefficient, the smaller the value of k, the better the filter characteristics of the integrator, but the required stabilization time is prolonged, so the value of k should be appropriate; w 0 It is the fundamental frequency command, and after the SOGI split term, the generalized integrator G with s domain as the first order and simple operation structure is obtained 1 (s) and G 2 (s), G 1 (s) and G 2 (s) It can not only realize the direct separation of the positive and negative se...

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Abstract

The invention discloses a linear FLL provided method for controlling a photovoltaic inversion adjuster, and belongs to the technical field of electric system control. The linear FLL provided method for controlling the photovoltaic inversion adjuster aims at applying the FLL synchronization technology to solving the problems that in the prior art, a photovoltaic grid-connected inverter is low in adjuster control accuracy and complex in implementation under the grid voltage distortion condition. The linear FLL provided method includes the steps that the grid three-phase voltage is firstly converted, then telescoping summing is carried out on classic SOGIs to obtain a simplified type first-order generalized integrator, obtained difference value signals are led out, the average value of the difference value signals is calculated and then input into an FLL, clarke inversion conversion is carried out on obtained positive-and-negative sequence voltage components to obtain three-phase voltage positive-sequence components under an abc coordinate system, and finally an output frequency estimated value is integrated to obtain the positive sequence phase. According to the filtering adjuster, the positive-and-negative-sequence separating calculating link is not needed, grid synchronous detection is not influenced by grids, and the linear FLL provided method is particularly suitable for the field of photovoltaic inverter control under the grid distortion condition.

Description

technical field [0001] The invention belongs to the technical field of power system control. Background technique [0002] In recent years, with the wide application of reactive power compensation devices, nonlinear loads, photovoltaic grid-connected inverters and other equipment, the grid voltage imbalance and harmonic pollution have become increasingly serious. When the grid voltage is unbalanced, grid pulsation with double frequency will be generated. In order to realize the reliable control of the photovoltaic inverter at this time, it is necessary to extract the positive sequence component signal from the distorted grid. The classic inverter regulator control uses an adaptive filter based on a second order generalized integrator based onorthogonal signal generator (SOGI-QSG). SOGI can use the resonant infinite gain characteristic to extract the positive sequence component of the fundamental wave, and filter The bandwidth of the converter only depends on the gain coeffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40
CPCH02J3/40
Inventor 党克郑玉浩党同王冬铂杨富磊颜冬侯少帅闫斌斌成凤东戚坤基车永亮刘畅
Owner NORTHEAST DIANLI UNIVERSITY
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