A Fast Phase-Locking Method Based on Frequency Aliasing Effect

A frequency aliasing and phase-locking technology, applied in the direction of automatic power control, polyphase network asymmetry reduction, polyphase network elimination/reduction asymmetry, etc., to achieve the effect of simple calculation

Active Publication Date: 2020-01-03
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

[0004] Aiming at the problems of the traditional phase-locking method in tracking the phase of the unbalanced and seriously harmonic-polluted power grid, the present invention provides a three-phase power grid voltage lock that is simple in calculation, fast in response, and can effectively eliminate the influence of negative sequence components and harmonic components. phase method

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  • A Fast Phase-Locking Method Based on Frequency Aliasing Effect
  • A Fast Phase-Locking Method Based on Frequency Aliasing Effect
  • A Fast Phase-Locking Method Based on Frequency Aliasing Effect

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing.

[0035] figure 1 It is a schematic diagram of the phase-locking process of the present invention. The phase-locking method of the present invention is used to track the phase of the positive-sequence fundamental wave component in the three-phase grid voltage, using a high-frequency modulation module, a D-axis sampling module, a Q-axis sampling module, a D-axis adder, a Q-axis adder and a phase The computing module is phase-locked.

[0036] Described phase locking method comprises the steps:

[0037] (1) The three-phase grid voltage V to be polluted a , V b , V c and at frequency f c Phase is θ c The high frequency carrier signal V carry Send it to the high-frequency modulation module, and obtain the high-frequency D-axis and Q-axis voltage components V after calculation d and V q ;

[0038] (2)V d and and V q They are respectively sent to the D-axis sampling mod...

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Abstract

The invention discloses a quick phase locking method based on a frequency aliasing effect. According to the phase locking method, firstly, network voltage is modulated to a high-frequency signal, multi-channel sampling is carried out under the same high frequency, after a sampling moment of each channel is designed, the influence of the aliasing effect on the frequency and the phase of a high-frequency alternating current signal is utilized, so that negative sequence and harmonic components in a digital signal of each channel after sampling are complementary, and the influence of the negative sequence and harmonic components is eliminated after summation. The control method of the invention is simple to realize, the harmonic disturbance is eliminated through directly adopting the high-frequency sampling aliasing effect, any complicated filtering algorithm is not needed, the dynamic delay is only one sampling period, and the influence of the negative sequence and harmonic components can be completely eliminated in theory.

Description

technical field [0001] The invention relates to a phase tracking method of a three-phase grid voltage, in particular to a fast phase-locking method based on the frequency aliasing effect. Background technique [0002] The three-phase grid voltage on the user side is usually polluted by various large nonlinear loads and unbalanced loads, resulting in serious unbalance and large harmonic content in the three-phase grid voltage. Specifically, there are often very significant negative-sequence voltage components and low-frequency 5th and 7th harmonic components in the three-phase grid voltage. [0003] A large number of negative sequence components in the grid voltage and these low-frequency harmonic components will cause inaccurate phase results and phase oscillation problems produced by traditional phase-locking methods. In response to these problems, there are two types of traditional improvement methods. One is the method of separating positive and negative sequences, usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/10H02J3/26H02J3/01
CPCH02J3/01H02J3/26H03L7/10Y02E40/40Y02E40/50
Inventor 李锐吴浩伟汪文涛金翔姚川李鹏周樑蔡凯欧阳晖李小谦姜波李可维邢贺鹏金惠峰徐正喜陈涛魏华罗伟孙朝晖谢炜吴大立
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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