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Double-frequency phase locking method based on dual-band-pass filter

A dual-bandpass filter and frequency doubling technology, which is applied in the automatic control of power, electrical components, etc.

Inactive Publication Date: 2015-04-29
闫朝阳 +1
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Problems solved by technology

Although these phase-locking methods have good performance, they are all phase-locked to the angular frequency of the grid voltage.

Method used

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  • Double-frequency phase locking method based on dual-band-pass filter

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Embodiment Construction

[0019] Such as figure 1 As shown, the three-phase grid voltage is expressed as v a , v b , v c , after Clark transform, get v α , v β . Using the newly created transformation matrix T + 'Extract the 2 times frequency fluctuation generated by the positive sequence component of the grid voltage . Use the band-pass filter to filter out the harmonics and DC flow of these two signals respectively, and obtain a set of symmetrical orthogonal signals. The amplitude of the orthogonal signal is the amplitude of the positive sequence component of the grid voltage, and the frequency is the grid voltage 2 times the frequency of the positive sequence component. Carry out Park transformation on this set of orthogonal signals to get , by controlling , phase-lock the 2-fold frequency AC, and the output phase is , and extract the amplitude of the positive sequence component of the grid voltage , The phase-locking part of the 2-fold frequency AC is consistent with the traditiona...

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Abstract

The invention discloses a double-frequency phase locking method based on a dual-band-pass filter. The double-frequency phase locking method is applied to extraction of positive and negative sequence component amplitudes, phase positions and frequencies under unbalanced states of network voltages. According to the method, two new transformational matrixes T+' and T-' are established to extract double-frequency fluctuation Vd+' and Vq+' both generated by a network voltage positive sequence component and double-frequency fluctuation Vd-' and Vq-' both generated by a network voltage negative sequence component, the dual-band-pass filter is used for extracting a double-frequency component, and the phase positions of the network voltage positive sequence component and the network voltage negative sequence component are locked accurately when the double-frequency component is locked accurately. By the double-frequency phase locking method, detection speed and accuracy of the positive and negative sequence component amplitudes, the phase positions and the frequencies can be improved; in terms of new energy grid connection and situations in need of quick extraction of the positive sequence component and the negative sequence component, the double-frequency phase locking method has a certain engineering application value.

Description

technical field [0001] The invention relates to a double-frequency phase-locking method based on a double-bandpass filter structure, and belongs to the field of phase-locking links and inverter current-type grid connection. Background technique [0002] The phase-locked loop is used in the current-type grid-connected link of the inverter. The current-type grid connection needs to make the current and the grid voltage have the same frequency and phase. Under the condition of unbalanced grid voltage, by extracting the positive and negative sequence components of the voltage and using SRF-PLL to phase lock them, the positive and negative sequence voltage amplitudes can be obtained. value, phase and frequency. The extraction methods of positive and negative sequence components of grid voltage include symmetrical component method, double rotating coordinate system (DDSRF) method, delay method, DSOGI method and so on. Although these phase-locking methods have good performance, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08
Inventor 闫朝阳贺红艳张志辉王怀宝张喆白鹤
Owner 闫朝阳
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