Synchronous modulation method for transition from asynchronous modulation to phase synchronization
A phase synchronization and synchronous modulation technology, which is applied in the control of electromechanical brakes, control systems, control generators, etc., can solve problems such as random changes, uncertain initial angles, and inability to achieve angle synchronization, so as to ensure smoothness and absolute synchronization Effect
Active Publication Date: 2021-01-26
JIANGSU GTAKE ELECTRIC CO LTD
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[0003] In the traditional synchronous modulation method, the calculation of the SVPWM vector angle is based on the current operating frequency and carrier frequency (equation 8 below). The vector angle in the modulation stage changes randomly. In addition, it is limited by the carrier adjustment accuracy of the main control chip such as DSP and the truncation error of angle calculation, which will lead to a certain deviation in the phase angle of each fundamental wave cycle, and this deviation The continuous accumulation of will lead to continuous changes in the phase angle, resulting in the inability to achieve angular synchronization
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[0027] 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.
[0028] Such as Figure 1-Figure 3 It shows a specific implementation of a synchronous modulation method in which asynchronous modulation transitions to phase synchronization: the specific implementation steps are as follows:
[0029] (1) Determine the carrier ratio N of synchronous modulation, and simultaneously determine the phase angle 0, 2π*1 / N, 2π*2 / N...2π*(N-1) / N of phase synchronization;
[0030] (2) When the motor is at low speed, the asynchronous modu...
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The invention discloses a synchronous modulation method for transition from asynchronous modulation to phase synchronization, and the method comprises the following steps: determining the carrier ratio N of synchronous modulation, and determining the phase angle 0, 2[pi]*1 / N, 2[pi]*2 / N... 2[pi]*(N-1) / N of phase synchronization at the same time; adopting an asynchronous modulation method when the motor is at a low speed, increasing the rotating speed of the motor but fixing the carrier frequency, and entering a synchronous modulation stage when the motor operation frequency exceeds the carrierfrequency divided by the set synchronous modulation ratio; and after entering a synchronous modulation stage, realizing synchronous modulation of phase synchronization, and judging whether the vectorangle is close to any one of N phase synchronization or not, thereby realizing synchronous modulation transition from asynchronous modulation to phase synchronization. According to the invention, thesmoothness of transition is ensured, after the phase synchronization synchronous modulation stage is entered finally, the modulated voltage frequency realizes a fixed carrier ratio according to the change of the carrier frequency, and the absolute synchronization of the phase angle is ensured.
Description
technical field [0001] The invention belongs to the field of speed regulation of motors controlled by frequency converters, and in particular relates to a synchronous modulation method for transitioning from asynchronous modulation to phase synchronous modulation. Background technique [0002] In the field of inverter-controlled motor speed regulation, as the motor speed increases, the carrier frequency cannot be further increased due to the processing speed of the main control chip or the large switching loss of the power device. At this time, the low-speed asynchronous modulation Transition to high-speed synchronous modulation, that is, the carrier frequency is fixed to an integer multiple of the operating frequency (that is, the carrier ratio is fixed), which can ensure that the harmonics are minimized at a relatively low carrier frequency. In order to further obtain a good symmetrical effect, phase synchronization is adopted Synchronous modulation method, that is, a vect...
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IPC IPC(8): H02P21/14H02P27/04
CPCH02P21/14H02P27/04
Inventor 曾恒力
Owner JIANGSU GTAKE ELECTRIC CO LTD