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Impedance Measurement Method Based on Disturbance Adaptive Adjustment

A self-adaptive adjustment and impedance measurement technology, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as difficult balance of impedance curve fitting accuracy, voltage response and current response damage to equipment, etc., to achieve Improve the prediction effect, increase the number of measurement points, and speed up the effect of measurement

Active Publication Date: 2022-04-01
HEFEI UNIV OF TECH
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Problems solved by technology

It is used to solve the problem that it is difficult to balance between reducing the measurement time and improving the accuracy of impedance curve fitting when the disturbance frequency step is constant, and to solve the problem of excessive voltage response and current response at the measurement frequency point damaging the equipment when the disturbance amplitude is constant question

Method used

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  • Impedance Measurement Method Based on Disturbance Adaptive Adjustment
  • Impedance Measurement Method Based on Disturbance Adaptive Adjustment
  • Impedance Measurement Method Based on Disturbance Adaptive Adjustment

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Embodiment Construction

[0064] The following describes the implementation of the present invention with specific examples in conjunction with the accompanying drawings.

[0065] figure 1 It is the topological diagram involved in the impedance measurement method of the disturbance frequency and disturbance amplitude adaptive control of the present invention. Depend on figure 1 It can be seen that the topology involved in the disturbance adaptive adjustment impedance measurement method includes the grid 10 , the grid-connected equipment 40 , and the impedance measurement device at the point of common coupling PCC connected to the grid 10 and the grid-connected equipment 40 . The impedance measurement device includes a disturbance injection unit 20 and a disturbance control unit 30. The disturbance control unit 30 includes a sampling unit 301 and an impedance calculation and command output unit 302. The disturbance injection unit 20 is connected in parallel to the power grid 10 and the grid-connected e...

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Abstract

The invention provides an impedance measurement method for disturbance self-adaptive adjustment, which belongs to the field of power quality and control. The impedance measurement device involved in the method includes a disturbance injection unit and a disturbance control unit. The impedance measurement method selects the disturbance frequency by linear interpolation in the Bode diagram coordinate system, predicts the impedance to be measured, and adjusts the injection according to the amplitude and phase of the predicted impedance. The magnitude of the disturbance, the linearity of the impedance is judged according to the actual measured impedance, and the next frequency direction and step size are adjusted. The method is simple to implement, and can realize more intensive measurement of grid-connected equipment whose impedance characteristics are completely unknown in a frequency band with irregular impedance, and prevents the frequency step from being too large and losing information. Adjusting the size of the injected disturbance current according to the predicted impedance can effectively prevent the damage to the equipment caused by the excessive injection of the disturbed current; the provided impedance measurement method can realize the adaptive control of the disturbance frequency step and amplitude.

Description

technical field [0001] The invention belongs to the field of power quality and control, and relates to an impedance measurement method for adaptive adjustment of disturbances, in particular, to an impedance measurement method for adaptive adjustment of current disturbance injection frequency and amplitude under grid-connected conditions, which is used in distributed power generation In the study, a method for selecting the frequency and amplitude of the disturbance when the disturbance injection method is used to measure the impedance of the equipment is provided. Background technique [0002] As the impedance-based grid-connected system stability analysis method is widely used, the method of accurately obtaining the output impedance of the inverter has also become a practical demand. The disturbance injection method has the advantages of real-time, accuracy and speed when measuring the inverter impedance. The existing disturbance injection method has the following disadvan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 李飞吴金涛方益成张永新马铭遥张兴
Owner HEFEI UNIV OF TECH
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