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Sliding weighting single-phase soft phase locking method based on reactive compensation

A sliding weighting, soft phase-locking technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of unable to ensure accurate acquisition of phase shift information, slow dynamic response, etc.

Inactive Publication Date: 2014-01-01
中船鹏力(南京)新能源科技有限公司
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Problems solved by technology

However, this method has the problem of slow dynamic response in principle, so that when the input signal frequency changes rapidly, it is impossible to ensure accurate acquisition of phase shift information to track phase lock

Method used

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  • Sliding weighting single-phase soft phase locking method based on reactive compensation
  • Sliding weighting single-phase soft phase locking method based on reactive compensation
  • Sliding weighting single-phase soft phase locking method based on reactive compensation

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Embodiment Construction

[0063] The invention discloses a sliding weighted single-phase soft phase-locking technology based on reactive power compensation, which includes the following steps:

[0064] Step 1, collecting the single-phase voltage of the current power grid side through the AD sampling port of DSP (digital signal processor, digital signal processor), obtaining the instantaneous value of the voltage sinusoidal waveform, and optimizing the instantaneous value of the voltage sinusoidal waveform through a filtering algorithm;

[0065] Step 2. Use the optimized voltage sinusoidal waveform instantaneous value as the horizontal axis input component of the Parker transformation, set the vertical axis input component of the Parker transformation to zero, and obtain the positive and negative sequence dq components through the positive and negative sequence Parker transformations sequentially, using The Parker transformation matrix of is:

[0066] T park ...

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Abstract

The invention discloses a sliding weighting single-phase soft phase locking method based on reactive compensation. According to the method, in order to guaranteeing that a single-phase grid-connected inverter can gain good performance, soft phase locking is achieved, fast frequency response and accurate phase locking deviation can be obtained at the same time, the key point is that beta semaphore is generated accurately and the output of the beta semaphore is made to be zero through a q-axis component obtained through dq transformation and through PI adjustment, the adjusted output quantity controls frequency, and the purpose of phase locking is achieved. Positive and negative zero sequence cross decoupling is carried out on transformation results by using two sets of Park transformation with reversed rotating directions, orthometric virtual quantity with 90-degree phase shifting is added to a system to carry out feedback regulation to eliminate noise interference in a single-phase system, therefore, the q-axis component obtained through phase locking is made to be more accurate, and the response speed is made to be faster.

Description

technical field [0001] The invention discloses a sliding weighted single-phase soft phase-locking method based on reactive power compensation, and relates to the field of grid-connected inverter system control. Background technique [0002] In power electronic conversion devices, single-phase grid-connected inverters can feed back electric energy to the grid. It has the advantages of stable DC voltage, sinusoidal output current, and grid energy feed. It is used in renewable energy such as solar energy, wind energy, and energy storage. widely used in use. [0003] The accurate acquisition of grid voltage or current phase information has an important impact on the steady state, dynamic performance and safe operation of various grid-connected inverters. In some special applications, in order to obtain more excellent control performance, it is necessary to measure Magnitude of grid voltage or current. Phase-locked loop technology is widely used in power electronic systems to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08
Inventor 郭多文徐进刘伟孙善勤
Owner 中船鹏力(南京)新能源科技有限公司
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