外文翻譯----基于tms320f2812dsp的有死區(qū)時(shí)間補(bǔ)償?shù)膕vpwm調(diào)速永磁同步電動(dòng)機(jī)(文件)
【正文】 the result of deadtime pensation. Therefore, this paper adopts an indirectly method to detect the zerocross point of phase current, which is based on the current vector angle φ in the twophase static reference frame. For convenient analysis and illustration, place the threephase currents ia, ib, ic in the threephase static reference frame and the two current ponents iα , iβ of the current vector in the twophase static reference frame into the same figure, which is shown in . According to the polarity of threephase currents ia, ib, ic, the iα iβ plane in the twophase static reference frame can be divided into six sectors: I(1), II(2), III(3), IV(4), V(5) and VI(6). For each sector in the iαiβ plane, there is a corresponding deadtime pensation rule. In other words, once the sector which the current vector belongs to is known, the deadtime effect can be pensated according to the corresponding pensation , recognizing the sector number of the current vector is the key problem. In this paper, the sector number is determined by thecurrent vector angle φ which can be calculated through the α and β axis ponents of the stator current vector. Equation (1) shows the calculation method of the current vector φ, and equation (2) shows the relationship between the sector number and the current vector φ. φ=kπ +arctan（ iβ /iα） (k = 0,1) . Current Polarity and Current Vector Angle ? TABLE I DEADTIME COMPENSATION RULES TABLE OF SVPWM ??????????? π /6 ) φ( π π 6 3 π π /2φ(7 π 7 π 5 7 π π /6φ(5 π 5 π 45 π π /6φ( ππ/ 3π /2 )φ( ππ/ 2π /6 )φ( π π 1=s e c t o r (2) For threephase voltage source inverter, the essence of deadtime pensation is to pensating the voltage deviation. However, in the digital motor driving and control system, voltage regulation is implemented through pulse width modulation, that is, through regulating the duty cycle of voltage pulse which has something to do with the pulse width T in one PWM period Tpwm. Therefore, in fact it is the pulse width T that is pensated in the practical application. TABLE I shows the deadtime pensation rules corresponding with the polarity of threephase currents ia,ib,ic and the sector number of the current vector in the iαiβ plane. It can be seen that for different sectors of the iαiβ plane, the pensation values are correspondingly different. In one word, the proposed deadtime pensation method can be carried out through the following steps: (1) Calculate the current vector angle φ through the α and β axis ponents of the stator current vector in the twophase static reference frame according to equation (1). (2) Determine the sector number through the current vector angle φ according to equation (2). (3) Execute the deadtime pensation algorithm according to the pensation rules table TABLE I. III. EXPERIMENTS In order to test and verify the proposed deadtime pensation method of SVPWM, experiments are established and made. The experiment system consists of PMSM, threephase voltage source inverter, control platform, dynamometer, heat dissipation system, et type of IGBT in the inverter is CM600DY24A produced by Mitsubishi. The control platform is based on DSP TMS320F2812 produced by Texas is a special motor control DSP which has many advantages and can implement highperformance motor control such as FOC (Field Oriented Control) and DTC (Direct Torque Control). The main parameters of the control objectPMSM used in experiments are listed in TABLE II. For different pulse width pensation values of , and , the deadtime pensation experiments are all made. shows
環(huán)評(píng)公示相關(guān)推薦
鄂ICP備17016276號(hào)-1