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Method and system for eliminating frequency coupling effect of phase-locked loop of grid-connected device

A technology of coupling effect and phase-locked loop, which is applied in the direction of automatic power control and electrical components, can solve problems such as shutdown due to failure, limitation of dynamic response capability of phase-locked loop, transient performance of grid-connected devices that do not meet the index assessment, etc., to achieve Solve the voltage and current distortion of the grid-connected point, improve the stable operation ability, and eliminate the effect of frequency coupling effect

Pending Publication Date: 2021-08-31
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To eliminate the interference of the harmonics in the input signal of the phase-locked loop to its output angle, the simplest and direct way is to reduce the bandwidth of the phase-locked loop; The transient performance of grid devices in fault ride-through occasions such as grid voltage drops and grid voltage rises does not meet the index assessment requirements, and in severe cases, it may even lead to fault shutdown
Another approach is to filter the input voltage of the phase-locked loop, and suppress the voltage signal disturbance from entering the phase-locked loop from the source, thereby reducing or even eliminating the possibility of frequency coupling disturbance introduced by phase-locking; in this way, although the phase-locked loop The internal dynamic response capability can be made very fast, but the dynamic response capability of the entire power grid voltage synchronization link will be affected by the filtering of the input voltage signal of the phase-locked loop

Method used

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  • Method and system for eliminating frequency coupling effect of phase-locked loop of grid-connected device
  • Method and system for eliminating frequency coupling effect of phase-locked loop of grid-connected device
  • Method and system for eliminating frequency coupling effect of phase-locked loop of grid-connected device

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Embodiment 1

[0039] Such as figure 2 As shown, the embodiment of the present application provides a method for eliminating the frequency coupling effect of the phase-locked loop of the grid-connected device, and the method includes:

[0040] Step S11, obtaining the frequency of the grid-connected point voltage;

[0041] In this embodiment, the angular frequency ω of the phase-locked loop output can be taken as pll Frequency ω as grid-connected point voltage pcc ; Preferably, take the frequency adjustment Δω output by the phase-locked loop regulator pll Frequency ω as grid-connected point voltage pcc .

[0042] Or, the angular frequency ω calculated according to the α and β axis components of the phase-locked loop input voltage signal seq Frequency ω as grid-connected point voltage pcc , ω seq The specific calculation formula is:

[0043] In the formula, k(k≥1) and k+1 represent the kth control period and the k+1th control period respectively, and T s It is the execution cycle o...

Embodiment 2

[0057] Such as image 3 As shown, the embodiment of the present application provides a system for eliminating the frequency coupling effect of the phase-locked loop of the grid-connected device, and the system includes an acquisition module, an extraction module, and an output module;

[0058] The obtaining module is used to obtain the frequency of the grid-connected point voltage;

[0059] In this embodiment, the angular frequency ω of the phase-locked loop output can be taken as pll Frequency ω as grid-connected point voltage pcc ; Preferably, take the frequency adjustment Δω output by the phase-locked loop regulator pll Frequency ω as grid-connected point voltage pcc .

[0060] Or, the angular frequency ω calculated according to the α and β axis components of the phase-locked loop input voltage signal seq Frequency ω as grid-connected point voltage pcc , ω seq The specific calculation formula is:

[0061] In the formula, k(k≥1) and k+1 represent the kth control pe...

Embodiment 3

[0074] Such as Figure 5 As shown, the embodiment of the present application provides a system for eliminating the frequency coupling effect of the phase-locked loop of the grid-connected device. The system includes a memory 21, a processor 22 and a The running program for eliminating the frequency coupling effect of the phase-locked loop of the grid-connected device, when the program for eliminating the frequency coupling effect of the phase-locked loop of the grid-connected device is executed by the processor 22, it is used to realize the elimination of the grid-connected device described in Embodiment 1 Steps in a method for frequency coupling effects in a phase-locked loop.

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Abstract

The invention discloses a method and system for eliminating the frequency coupling effect of a phase-locked loop of a grid-connected device. The method comprises the following steps: acquiring the frequency of the voltage of a grid-connected point; extracting a frequency disturbance component from the frequency of the grid-connected point voltage; obtaining the compensation amount of the phase-locked loop input signal based on the extracted frequency disturbance component; and superposing the compensation amount of the input signal of the phase-locked loop to the input signal of the phase-locked loop regulator. Under the condition that the power grid is weak, the problem of voltage and current distortion of the grid-connected point of the grid-connected device and even the problem of voltage and current oscillation caused by the voltage and current distortion can be solved; the bandwidth of the phase-locked loop does not need to be reduced, the dynamic response capability of the device in the power grid voltage synchronization link is hardly influenced, the frequency coupling effect introduced by the phase-locked loop is eliminated, and the stable operation capability of the grid-connected device in the weak power grid is improved.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a method and system for eliminating the frequency coupling effect of a phase-locked loop of a grid-connected device. Background technique [0002] In recent years, with the rapid development of new energy and the widespread use of power electronic devices in the power generation, transmission, distribution, and consumption of power systems, the grid-connected characteristics of the grid-connected devices and the interaction stability with the grid are affected. It has attracted widespread attention, especially in the context of weak power grids, and the related stability issues are more prominent. [0003] Such as figure 1 As shown, the current grid-connected devices generally adopt the vector control framework based on phase-locked loops. Wu Xiangqiang et al. proposed in the literature "Sequence Impedance Model of Three-phase Grid-connected Inverter Conside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08H03L7/089
CPCH03L7/08H03L7/089
Inventor 陈佳明周党生
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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