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Software phase-locked loop realization method based on average filtering algorithm

A technology of software phase-locked loop and filtering algorithm, which is applied in the field of signal processing to achieve the effect of improving the overall response speed, tracking accuracy and dynamic response speed

Inactive Publication Date: 2012-07-25
NANJING APAITEK TECH
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  • Abstract
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Problems solved by technology

However, the two-order IIR filter used in this paper will have a certain delay relatively speaking.

Method used

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  • Software phase-locked loop realization method based on average filtering algorithm
  • Software phase-locked loop realization method based on average filtering algorithm
  • Software phase-locked loop realization method based on average filtering algorithm

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Embodiment Construction

[0022] The software phase-locked loop realization method based on average value filter algorithm of the present invention, it comprises the following steps:

[0023] 1) For a three-phase symmetrical 380V power grid, the three-phase phase voltages are respectively u a , u b , u c , where u a =311*sin ωt,u b =311*sin(ωt-120°), u c =311*sin(ωt+120°), first rotate the DQ coordinate transformation of the three-phase grid voltage, and extract its active and reactive components according to the three-phase coordinate transformation, specifically: for the three-phase grid voltage u a , u b , u c Perform DQ coordinate transformation, D axis component

[0024] u d = 2 / 3 [ u a * sin ωt + u b * ( - 1 ...

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Abstract

The invention discloses a software phase-locked loop realization method based on an average filtering algorithm. The method increases the response speed and realizes remarkably short dynamic response time. The software phase-locked loop realization method based on an average filtering algorithm, disclosed by the invention, comprises the following steps of: 1) firstly performing rotary DQ coordinate transformation on the voltage of a three-phase power grid, and extracting the active and inactive components according to the three-phase coordinate transformation; 2) performing average filtration on the Q-axis signal, and averaging the Q-axis in the T / 6 interval to obtain the corresponding DC (direct current) flow; 3) outputting the filtered signal by an incremental PI regulator to obtain the required power-grid synchronous angle; and 4) programming by a 32-bit DSP (digital signal processor) to realize software phase lock.

Description

technical field [0001] The invention relates to a method for realizing a software phase-locked loop, in particular to a method for realizing a software phase-locked loop based on an average value filtering algorithm, and belongs to the technical field of signal processing. Background technique [0002] In recent years, power electronic devices have been widely used in power systems, various industrial sectors and household appliances. Therefore, obtaining the phase angle of the three-phase grid voltage accurately and quickly is a precondition to ensure that the whole system has good steady-state and dynamic performance. The general way to obtain the grid voltage phase angle is to first generate a signal synchronous with the grid voltage, and then obtain the phase angle through the synchronous signal. If the phase-locked loop design is not good, it will lead to the distortion of the output voltage and current of the system, and even affect the stability of the system. There...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 张东张明花跃学
Owner NANJING APAITEK TECH
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