Voltage vector PWM method based on duty ratio DTC
A voltage vector and modulation method technology, applied in vector control systems, motor generator control, control of electromechanical brakes, etc., can solve the problems of complex dead zone compensation, reduced control system performance, unfavorable implementation, etc., and reduce the number of dead zone actions. , Reduce the impact of dead zone effect, easy to achieve effect
Inactive Publication Date: 2016-07-13
上海新源工业控制技术有限公司 +1
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Problems solved by technology
Due to the existence of the dead zone, the actual output voltage deviates from the reference voltage vector in a control cycle, which in turn affects the observation of the stator flux linkage, causing the performance of the control system to decline or even oscillate.
In the duty ratio DTC system, adopting the general principle of minimum switching times for voltage vector modulation will make dead zone compensation complicated, which is not conducive to the realization of
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[0016] The present invention will be further described below in conjunction with accompanying drawing, and the structure and principle of this device are very clear to those skilled in the art. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0017] In the existing duty ratio DTC system, adopting the general principle of minimum switching times for voltage vector modulation will make dead zone compensation complicated, which is not conducive to implementation, such as figure 1 shown. Voltage vector u 1 In one cycle, phase A and phase B keep low level, and phase C performs PWM modulation. At this time, in one control cycle, the first and last zero vectors act, and the middle section of the non-zero vector acts; the voltage vector u 5 , Phase B performs PWM modulation, and phase A and phase C maintain high level. At this time, the non-zero vectors at the beginning and end ...
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The invention relates to the voltage vector modulation technical field of controlling a PMSM, concretely a voltage vector PWM method based on duty ratio DTC (Direct Torque Control). An input signal line of a speed regulating system FMSM is in series connection with an inverter switch signal terminal, a phase modulator PWM signal terminal, and a voltage vector switch state table signal terminal; a voltage vector switch state table is provided with a first switch and a second switch; an output signal line of the speed regulating system FMSM is in connection with a position sensor (PS); the PS is respectively in connection with a voltage vector switch state table and a PWM signal output terminal through multipath sensor signal terminals. The method performs PWM on an upper bridge arm conduction phase, but not on a lower bridge arm conduction phase, allowing twice dead zone action in each period; dead zone compensation in each control period is mutually independent, does not influence each other, and is easy to realize.
Description
[technical field] [0001] The invention relates to the technical field of voltage vector modulation for controlling a permanent magnet synchronous motor, in particular to a voltage vector PWM modulation method based on a duty cycle DTC. [Background technique] [0002] The basic principle of vector control is to measure and control the stator current vector of the asynchronous motor, and to control the excitation current and torque current of the asynchronous motor according to the principle of magnetic field orientation, so as to achieve the purpose of controlling the torque of the asynchronous motor. Specifically, the asynchronous motor The stator current vector is decomposed into the current component that generates the magnetic field (excitation current) and the current component that generates torque (torque current) to be controlled separately, and the amplitude and phase between the two components are controlled at the same time, that is, the stator current vector is con...
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Login to View More IPC IPC(8): H02P27/12H02P21/12
CPCH02P27/12H02P21/12
Inventor 杨影孙承波
Owner 上海新源工业控制技术有限公司