which reduces the complexity of coordinate transformation, vector selection and duty cycle calculation in αβγ coordinate, as well as facilitates the realization of digital control. By analyzing the average current model of the
The complexity was reduced by avoiding the Clark coordinate transformations and trigonometric function calculation in the conventional SVPWM. The simulation of a three-phase asynchronous motor was built by using the novel SVPWM. The results verify the validity of the algorithm.徐传芳...
(China University of Mining and Technology,Xuzhou 221008, hina) Abstract:There are always complicated sector identification and duty cycle calculations that would normally involve trigonometric function calculations or look-up tables in the conventional three-level SVPWM algorithms,thus taking up much ...
The duty cycle calculation algorithm is based on linear shape functions of tetrahedron finite element. The FE nodes coordinates are calculated from voltage of unbalance value. The DC voltage balancing problem is also considered. (A novel 3D-SVPWM feed-forward modulation for three level four legs ...
As a result 499D is regarded as the PWM cycle value in the code programming and pulse width table calculation. For SPWM/THIPWM/SAPWM, all the modulated waveforms can be described with mathematic equations so pulse width tables can be directly pre-calculated for look-up. Here the 2π ...
In order to simplify the calculation of the traditional three-level SVPWM,and improve the simulation efficiency for the practical system,by using the TI TMS320F28335 DSP to achieve three-level SVPWM algorithm as a reference,a three-level inverter SVPWM algorithm on a non-orthogonal coordinate syste...
This value will be used to calculate // phase advance only if PHASE_ADVANCE is defined // This is the calculation from the required phase advance to the actual // value to be multiplied by the speed of the motor. So, if PHASE_ADVANCE is // enabled, a certain amount of shit angle ...
图5 计算时间参数Fig.5 Calculation of the time parameter 定义占空比参数为 最终可确定送到微控制器比较寄存器CMPR x(x=1,2,3)的值 Ta,Tb,Tc如表2所示,计算占空比参数与比较值的仿真模型如图6所示。 表2 扇区号S与三相PWM波占空比Tab.2 The sectornumberand the duty cycle ofthree phase PWMS ⅠⅡⅢⅣ...
Compared with the prior art, the direct current bus voltage Ud and the actual switching time Ts are not needed, calculation is easy and convenient and response is fast in the electrode control process, the detecting error of the direct current bus voltage Ud and the actual switching time Ts ...
Compared with the prior art, the present invention does not require to use the actual DC link voltage Ud and the Ts of the switching time, the electrode simple calculation in the control process, fast response, and determine the parameters of the DC link voltage Ud in the absence of actual...