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Disturbance mixed injection impedance frequency sweep control method

A technology of impedance sweep frequency and control method, applied in impedance measurement and other directions, can solve the problems of resonance excitation and low measurement accuracy, and achieve the effect of avoiding measurement errors, achieving accurate measurement, and avoiding the impact of stable work and safety.

Active Publication Date: 2019-08-09
HEFEI UNIV OF TECH
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Problems solved by technology

It is used to solve the problem of low measurement accuracy in the case of single disturbance injection and resonance excitation caused by a single disturbance

Method used

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  • Disturbance mixed injection impedance frequency sweep control method
  • Disturbance mixed injection impedance frequency sweep control method
  • Disturbance mixed injection impedance frequency sweep control method

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Embodiment Construction

[0041] The following describes the implementation of the present invention with specific examples in conjunction with the accompanying drawings.

[0042] figure 1 Shown is the topology diagram involved in the impedance sweep control method of the disturbance mixed injection of the present invention. Depend on figure 1 It can be seen that the topology involved in the impedance sweep control method includes the grid 10 , the grid-connected equipment 40 , and the disturbance impedance sweeping device at the common coupling point PCC connected to the grid 10 and the grid-connected equipment 40 .

[0043] The disturbance impedance frequency sweeping device includes a disturbance mixing injection unit 20 and a disturbance control unit 30 . The disturbance mixing injection unit 20 includes a disturbance voltage injection unit 201 and a disturbance current injection unit 202 , and the disturbance control unit 30 includes a sampling unit 301 and a selection and calculation unit 302 ....

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Abstract

The invention provides a disturbance mixed injection impedance frequency sweep control method. A impedance frequency sweep control device related to the method comprises a disturbance mixed injectionunit and a disturbance control unit. By adopting the impedance sweep frequency control method, a primary disturbance signal with settable duration and amplitude can be injected through the disturbancemixed injection device. By comparing the ratio of the primary disturbance response amplitude to the fundamental wave amplitude in advance, a disturbance injection mode meeting the precision and the system stability is selected as secondary disturbance injection. The disturbance control unit is used to collect the response of the grid-connected equipment under the secondary disturbance, and calculate impedance of grid-connected equipment. The method is simple to realize, and can be used to effectively select the disturbance injection mode with high precision and small influence on the system stability. The impedance sweep frequency control device can be used to realize voltage and current disturbance injection. A basis is provided for impedance-based stability analysis.

Description

technical field [0001] The invention belongs to the field of power quality and control, and relates to an impedance sweeping method for mixed injection of voltage disturbance and current disturbance under grid-connected conditions, and provides a method for selecting disturbance injection in frequency sweep measurement of equipment impedance in the research of distributed power generation . [0002] technical background [0003] The impedance-based grid-connected system stability analysis needs to know the grid impedance and the impedance of the grid-connected equipment. The impedance sweep experiment can obtain the output impedance of the grid-connected equipment through the impedance sweep experiment without obtaining the control structure and parameters of the grid-connected equipment. The current application of impedance measurement technology usually adopts the method of direct injection of a single disturbance, and either measures by injecting current disturbance or in...

Claims

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Application Information

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IPC IPC(8): G01R27/16
CPCG01R27/16
Inventor 李飞黄耀张永新王艺潮张兴王付胜
Owner HEFEI UNIV OF TECH
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