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A Signal Processing Method for Reducing Current Distortion of Photovoltaic Inverter

A photovoltaic inverter and current distortion technology, which is applied in the direction of photovoltaic power generation, irreversible DC power input conversion to AC power output, electrical components, etc., can solve the problem of large harmonic content of grid-connected current, and achieve a small coefficient, The structure is simple and the effect of improving the quality of grid-connected current

Active Publication Date: 2017-02-15
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] In order to solve the problem in the prior art that the grid-connected current of photovoltaic inverters has a large harmonic content caused by serious grid-side voltage distortion, the present invention provides a grid-connected current that is beneficial to provide grid-connected inverters. Quality reduction photovoltaic inverter current distortion signal processing method

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  • A Signal Processing Method for Reducing Current Distortion of Photovoltaic Inverter
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  • A Signal Processing Method for Reducing Current Distortion of Photovoltaic Inverter

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[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0032] Such as figure 1 As shown, a signal processing method for reducing photovoltaic inverter current distortion is characterized in that it includes the following steps: the grid voltage signal is converted by a voltage sensor and then sequentially passed through an A / D sampling module, an IIR digital filtering module, a digital shaping module and The phase angle calculation module finally obtains the actual grid phase angle information.

[0033] The IIR digital filter module has the following constraints before filtering: 1), the IIR digital filter is designed as an IIR digital band-pass filter, and the bandwidth does not exceed 100Hz; 2), the center frequency of the IIR digital band-pass f...

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Abstract

The invention discloses a signal processing method for reducing current distortion of photovoltaic inverters. The signal processing method is characterized by comprising steps of (1), converting voltage signals of power grids by voltage sensors, and then converting the analog signals into digital signals by A / D (analog / digital) sampling modules; (2), transmitting the digital signals to IIR (infinite impulse response) digital filter modules, digitally filtering the digital signals and then outputting sine wave signals; (3), transmitting the sine wave signals to digital shaping modules and outputting square wave signals after the sine wave signals are converted; (4), inputting the square wave signals into phase angle computing modules and computing phase angles of the voltages of the power grids; (5), converting the phase angles outputted by the phase angle computing modules and outputting PWM (pulse width modulation) control signals. The signal processing method for reducing the current distortion of the photovoltaic inverters has the advantages that the problem of high harmonic contents in grid-connected currents of existing photovoltaic inverters due to severe grid-side voltage distortion can be solved by the aid of the signal processing method, and the signal processing method is favorable for improving the quality of grid-connected currents of the grid-connected inverters.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and in particular relates to a signal processing method for reducing current distortion of a photovoltaic inverter. Background technique [0002] Photovoltaic grid-connected power generation technology has become an important direction of new energy utilization. Grid-connected inverters are the core components of photovoltaic systems, so high-quality inverter power supplies have become the focus of research. [0003] In the photovoltaic grid-connected system, it is an essential link to accurately and quickly detect the frequency, phase and amplitude of the grid voltage. When the grid voltage is severely distorted, the output current of the inverter is prone to distortion problems such as zero crossing, peak, and trough, which affect the power quality of the grid. To solve this problem, the traditional method is to use a digital phase-locked loop to detect the zero-crossing point...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M7/42H02J3/38
CPCY02E10/56
Inventor 史明明袁晓冬陈兵柳丹吕振华汪志成
Owner STATE GRID CORP OF CHINA
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