A signal phase locking method and system
A signal and phase-locked technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of output phase overshoot, synchronous rotation phase-locked loop overshoot, negative impact of phase-locked loop application, etc.
Active Publication Date: 2022-03-01
浙江日风电气股份有限公司
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[0003] However, in the initial stage of grid phase synchronization using this control method, there is an overshoot phenomenon in the synchronous rotating phase-locked loop, that is, the output phase exceeds the allowable adjustment range, which has a relatively large negative impact on the subsequent application of the phase-locked loop
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[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0048] In the initial stage of grid phase synchronization using traditional control methods, there is an overshoot phenomenon in the synchronous rotary phase-locked loop, that is, the output phase exceeds the allowable adjustment range, which has a greater negative impact on the subsequent application of the phase-locked loop.
[0049] The signal phase-locking method of the present application uses the first phase, the second phase, and the third phase determin...
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The present application discloses a signal phase-locking method and system. The method includes: acquiring a real-time three-phase voltage signal of the power grid; converting the real-time three-phase voltage signal into a first voltage signal according to the first phase; the first phase is a bias The integral of angular frequency to time; according to the second phase, the first voltage signal is transformed into an intermediate three-phase voltage signal; the second phase is the difference between the first phase and the feedforward phase, and the feedforward phase is the error adjustment value and the feedforward The product of coefficients; according to the third phase, transform the intermediate three-phase voltage signal into the second voltage signal; adjust the error of the q-axis voltage signal in the second voltage signal and then sum it with the offset angular frequency, and then integrate the time to get output phase. The signal phase locking method of the present application utilizes the bias angular frequency, the error adjustment value and the feedforward coefficient to determine the first phase, the second phase and the third phase, so as to control the transfer function of the corresponding closed-loop system, so that the output phase can be controlled. Overshoot occurs.
Description
technical field [0001] The invention relates to the field of phase-locked loop control, in particular to a signal phase-locking method and system. Background technique [0002] At present, the traditional phase-locked loop control generally uses a synchronous rotating phase-locked loop, and its control process is as follows figure 1 As shown, the three-phase voltages Va, Vb, and Vc of the actual power grid are transformed into Vd and Vq of the dq coordinate system through coordinate conversion, and then Vq is passed through the error regulator, and finally the integral determines the output phase θ of the phase-locked loop pll . [0003] However, in the initial stage of using this control method for grid phase synchronization, the synchronous rotating phase-locked loop has an overshoot phenomenon, that is, the output phase exceeds the allowable adjustment range, which has a greater negative impact on the subsequent application of the phase-locked loop. [0004] Therefore, ...
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IPC IPC(8): H03L7/10H03L7/08
CPCH03L7/10H03L7/08
Inventor 徐国金陈建明杨一卢钢
Owner 浙江日风电气股份有限公司