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Double correction software phase-lock loop implementation method

A technology of software phase-locked loop and implementation method, which is applied in the field of signal processing, and can solve problems such as inability to apply and slowing down of dynamic response speed

Inactive Publication Date: 2005-08-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its shortcomings are: the use of delayed feedback and variable parameter PI control in the closed loop loop improves the tracking accuracy and reduces the dynamic response speed. The response time is 50ms, which cannot be applied in occasions that require a faster response speed.

Method used

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  • Double correction software phase-lock loop implementation method
  • Double correction software phase-lock loop implementation method
  • Double correction software phase-lock loop implementation method

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing and specific embodiment for further description, concrete steps are as follows:

[0053] 1) The discrete sampling frequency is 10KHZ in MATLAB simulation.

[0054] 2) Design the phase-locked loop model structure as figure 1 As shown, the module source is the signal source, the port f outputs the signal f(t) to be phase-locked, and the port V output signal V(t) is the fundamental component in f(t). The waveform of the fundamental component V(t) and the phase-locked loop output signal s(t) are displayed by the scope1 module.

[0055] First, the input signal f(t) expressed by formula (1) is sampled by A / D to become a digital signal, and then compared with the reference signal sin(ω 0 t), cos(ω 0 t) multiplied. The obtained results pass through the digital low-pass filter 1 and the digital low-pass filter 2 respectively, and the output result of the low-pass filter 1 is u 1 (t) and the result u of the low-pass filter 2 out...

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Abstract

A double correcting software PLL in the field of signal processing technology. The processes are as follows: base on the standard signal, utilize the output of parallel double low pass filter to get resection tangent function to correct frequency; base on the output signal of the frequency correcting tache, use he output of parallel double low pass filter to get resection tangent function to correct phase; design low pass filter to assure PLL's tracking speed and precision; adopt TM320C2407DSP to program and speed up the calculation. This invention adopts simple loop control, has high stability and fast tracking speed. The temporary state response time is less than 20ms. It precisely and quickly measures the voltage, base wave frequency and phase of the current of the electric system. It supplies the synchronous signals to the non-power compensator, the filter and micro-computer protective device.

Description

technical field [0001] The invention relates to a method for realizing a phase-locked loop, specifically, a method for realizing a double-correction software phase-locked loop. It belongs to the technical field of signal processing. Background technique [0002] At present, analog phase-locked loop and digital phase-locked loop technology are commonly used to obtain the initial phase and frequency of the system fundamental wave. Both the analog phase-locked loop and the digital phase-locked loop are implemented by hardware, and the analog phase-locked loop has problems such as DC zero drift, device saturation, loss of lock, jitter, and low reliability. The digital phase-locked loop also has high requirements on the device, and it is difficult to design a low-pass filter with a digital circuit, and it is difficult to improve the precision. More importantly, these two methods both rely on the detection of the zero-crossing moment, but the harmonics of the voltage and current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/00H03L7/08
Inventor 纪飞峰曼苏乐陈陈
Owner SHANGHAI JIAO TONG UNIV
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