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Novel power grid phase-locked loop adaptive compensation method and compensation system

A self-adaptive compensation and phase-locked loop technology, applied in the field of power systems, can solve the problems of poor phase-locking adaptability and inability to quickly and accurately track the power grid when the power grid falls, and achieves a large-scale popularization and application, good phase-locking effect, adaptable effect

Pending Publication Date: 2021-06-22
云南电网有限责任公司保山供电局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing technology cannot quickly and accurately track the power grid in the face of unbalanced power grids with superimposed high-order harmonics and rapid frequency changes, and its phase-locking accuracy and speed need to be improved. Poor phase lock adaptability

Method used

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  • Novel power grid phase-locked loop adaptive compensation method and compensation system
  • Novel power grid phase-locked loop adaptive compensation method and compensation system
  • Novel power grid phase-locked loop adaptive compensation method and compensation system

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Embodiment 1

[0054] In view of the defects existing in the prior art, the inventor actively researches and innovates based on years of rich practical experience and professional knowledge in this field, and cooperates with the application of academic theories, in order to create a practical and feasible power grid phase-locked loop self-adaptive compensation technology to make it more practical. After continuous research, design and repeated trials and improvements, the present invention with real practical value is finally created.

[0055] see Figure 1~3 ,in, figure 1It is a schematic flow chart of a novel power grid phase-locked loop self-adaptive compensation method disclosed in the embodiment of the present invention. This method is suitable for fast and accurate phase-locking when the power grid is unbalanced and high-order harmonics are superimposed and the frequency changes rapidly. In the scenario, the method is implemented by a novel power grid phase-locked loop adaptive compe...

Embodiment 2

[0104] Please refer to the attached Image 6 , is a schematic diagram of functional modules of a new power grid phase-locked loop adaptive compensation system provided in Embodiment 2 of the present invention. The system is suitable for implementing the new power grid phase-locked loop adaptive compensation method provided in the embodiment of the present invention. The system specifically includes the following modules:

[0105] The first acquisition module 201 is used to acquire the instantaneous values ​​Va, Vb and Vc of the grid three-phase voltage;

[0106] The coordinate transformation module 202 is used to convert the instantaneous values ​​Va, Vb and Vc of the three-phase voltage of the power grid into Vq and Vd under the two-phase synchronous rotating coordinates through coordinate transformation;

[0107] A filter processing module 203, configured to perform filter processing on Vq and Vd under the two-phase synchronously rotating coordinates;

[0108] The fuzzy op...

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Abstract

The invention discloses a novel power grid phase-locked loop adaptive compensation method and compensation system. The method comprises the following steps: acquiring instantaneous values Va, Vb and Vc of three-phase voltage of a power grid; converting the instantaneous values Va, Vb and Vc of the three-phase voltage of the power grid into Vq and Vd under two-phase synchronous rotating coordinates through coordinate transformation; carrying out filtering processing on the Vq and the Vd under the two-phase synchronous rotation coordinates; performing fuzzy PID operation on the negative sequence deviation value delta Vq of the Vq and the deviation value change rate delta Vq / delta t to obtain an angle theta *; summing the angle theta * and the compensation angle theta_cmp to obtain a final angle, and performing real-time online compensation. According to the novel power grid phase-locked loop adaptive compensation method and compensation system provided by the embodiment of the invention, phase locking can be rapidly and accurately performed under the conditions that the power grid is unbalanced, higher harmonics are superposed and the frequency is rapidly changed, the adaptability is high, the phase locking effect is good, and the compensation method and compensation system are suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a novel power grid phase-locked loop self-adaptive compensation method and compensation system. Background technique [0002] The whole composed of substations of various voltages and transmission and distribution lines in the power system is called the power network, which includes three units of power transformation, power transmission, and power distribution. The task of the power network is to transmit and distribute electric energy and change the voltage. With the development of the global economy, electric energy, as a widely used energy source, has penetrated into all aspects of industrial production, society and people's life. [0003] At present, the existing technology cannot quickly and accurately track the power grid in the face of unbalanced power grids with superimposed high-order harmonics and rapid frequency changes, and its phase-locking accuracy and speed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/10
Inventor 姚捷沈龙朱红杰叶强田亮赵其根
Owner 云南电网有限责任公司保山供电局
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