Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase

A grid voltage and inverter technology, applied to the phase angle between voltage and current, instruments, measuring devices, etc., can solve the problems of poor phase-locking accuracy, inability to filter out harmonic interference, and poor phase-locking accuracy , to achieve the effect of strong anti-interference ability, good adaptability and quick response

Active Publication Date: 2013-12-25
宁夏隆基宁光仪表股份有限公司
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Problems solved by technology

Among them, the delay method only needs to construct an array, which has a simple structure, but because it cannot filter out the harmonic interference in the collected grid voltage signal, the phase-locking accura

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  • Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase
  • Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase
  • Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase

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[0027] The specific method of its realization mainly has five steps: the first step is to filter the signal through the band-pass filter module. This filter has a great attenuation of the signal outside the resonant frequency. Use this feature to achieve the collected voltage signal Filter out harmonics and DC components. In the second step, the filtered signal Vα is passed through the quadrature signal generating module to generate a voltage signal Vβ lagging 90 degrees. The third step is to use the last estimated angle θ'to perform d-q transformation on Vα and Vβ, and perform the difference operation between the result Vq and 0. The fourth step is to do a proportional integral (PI) operation on the difference. In the fifth step, the calculation result in the fourth step and the base angular frequency of the power grid will be summed to obtain the estimated angular frequency of the power grid. The sixth step is to integrate the estimated angular frequency to obtain the estim...

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Abstract

The invention relates to a method for using a one-phase photovoltaic grid-connected inverter to detect a network voltage phase. The method for using the one-phase photovoltaic grid-connected inverter to detect the network voltage phase is characterized by comprising the following steps of (1) carrying out filtering processing on collected network voltage signals, removing higher harmonic except direct-current components and fundamental frequencies through filtration, and obtaining a signal Valpha; (2) carrying out 90-degree phase shifting on the obtained signal Valpha, and generating a signal Vbeta, namely, generating a set of orthogonal signals; (3) carrying out d-q conversion on the obtained orthogonal signal Valpha and the obtained orthogonal signal Vbeta according to an estimation angle theta' of a power grid, and obtaining a Vd and a Vq, wherein the initial value of the estimation angle theta' of the power grid is set to be zero, the operation value can be updated through the step (4) and the step (5), and thus the estimation angle theta' can reach the real network voltage phase after the transient state process ends. The method for using the one-phase photovoltaic grid-connected inverter to detect the network voltage phase has the advantages that interference of the harmonic in the collected network voltage signals can be removed through filtration, signals, with the direct-current components, in the collected network voltage signals can be removed through filtration, and higher phase locking accuracy can be achieved.

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Claims

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Application Information

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Owner 宁夏隆基宁光仪表股份有限公司
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