Single-phase adaptive frequency-locking system for reducing harmonic influence of power grid

A harmonic influence and self-adaptive technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as reducing the output accuracy and response speed of the phase-locked loop, not suitable for single-phase systems, and voltage zero-crossing drift. Achieve the effect of reducing the difficulty of construction, good filtering performance, and small amount of calculation

Inactive Publication Date: 2017-04-05
TIANJIN UNIV
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Problems solved by technology

Among them, although the phase-locked loop method based on synchronous rotating coordinate transformation can accurately capture the frequency and phase of the fundamental component of the input voltage, this method is not suitable for single-phase systems; Only two zero-crossing points can be detected, and when the grid voltage waveform is severely distorted, the voltage zero-crossing point will usually drift, so this method will significantly reduce the output ac

Method used

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  • Single-phase adaptive frequency-locking system for reducing harmonic influence of power grid
  • Single-phase adaptive frequency-locking system for reducing harmonic influence of power grid
  • Single-phase adaptive frequency-locking system for reducing harmonic influence of power grid

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Embodiment Construction

[0052] Aiming at the problems of slow response speed, poor filtering performance and complex algorithm of the frequency adaptive system in the new energy single-phase grid-connected synchronous system, the present invention uses a quadrature signal generator with a filtering function, by The signal generators are cascaded to generate two sets of orthogonal signals. The frequency adaptive system is constructed by combining two sets of orthogonal signals. The system has strong filtering performance, which greatly improves the stability of the frequency adaptive system; at the same time, the constructed frequency adaptive system has the characteristics of fast response, small amount of calculation, and strong robustness, making it suitable for power grids In the grid synchronous system where the voltage is severely distorted.

[0053] specifically:

[0054] (1) Orthogonal signal generator structure

[0055] The quadrature signal generator utilized by the present invention is a...

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Abstract

The invention relates to a new energy generating grid-connected system, and provides a single-phase adaptive frequency-locking system capable of improving the stability of a frequency adaptive system. The system is advantaged by fast response speed, small operation amount, and high robustness, and is applicable to a power grid synchronization system with severe distortion of the power grid voltage. According to the technical scheme of the single-phase adaptive frequency-locking system for reducing the harmonic influence of the power grid, two orthogonal signal generators are cascaded to generate two groups of orthogonal signals, and a frequency adaptive controller constructs the frequency adaptive system through combined operation of the two groups of orthogonal signals. The system is mainly applied to new energy generating grid-connected occasions.

Description

technical field [0001] The invention relates to a new energy power generation grid-connected system, in particular to a novel single-phase grid synchronization technology capable of reducing the influence of grid harmonics. Specifically, it involves a single-phase adaptive frequency-locking system that reduces the influence of grid harmonics. Background technique [0002] With the continuous development of the smart grid, more and more clean energy sources such as solar energy and wind energy generate electricity in a reliable way. The integration of distributed power sources with the environment and flexible power generation methods have brought great changes to the contemporary power system. In order to ensure that distributed power supplies provide reliable power to the grid, a grid-connected control strategy with superior performance is an essential link. In the concrete implementation of the grid-connected control strategy, it becomes a key basic problem to accurately...

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Application Information

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IPC IPC(8): H02J3/40
CPCH02J3/382H02J3/40
Inventor 王萍张博文贝太周
Owner TIANJIN UNIV
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