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108 | Maddu & Bhasme
Fig. 1. Experimental lab setup of FPGA-based Wavect Controller
and 10 kHz respectively. The SVPWM technique using the by using FPGA-based Wavect real-time digital controllers and
Min-Max method has shown superior performance over other easily interfaces with MATLAB software. The most important
methods. In this paper, based on the Simulink results the most conclusions have been drawn from the research work are as
effective PWM methods for VSI-based two-level inverter is follows:
implemented using the Wavect Real-time controller. The con-
trol algorithm is implemented in MATLAB/Simulink and then • To achieve high performance of AC drive, the SVPWM
converted into HDL code using HDL workflow. Wavect li- technique is suitable over other PWM methods for mo-
brary enables the interfacing of MATLAB algorithm with the tor control algorithms.
hardware and software. For SPWM, the reference sinusoidal
voltage waves are compared with the carrier triangular wave, • From Table V, SPWM has shown comparable results to
and load currents are observed in digital time control, simi- SVPWM in terms of THD using an LC filter.
larly for SVPWM, reference voltages and the load current are
obtained as shown in Fig. 12. Table V shows comparative • The implementation of the SVPWM technique in the
hardware results of SPWM and SVPWM techniques with LC Min-Max method is quite easier compared to the other
filter. conventional techniques used in other standard con-
trollers. Thus, the computation time is low in the ab-
IV. CONCLUSION sence of complex calculations or optimized algorithms.
There are numerous controllers are available in the literature • The controllers equipped with FPGA show quite fast re-
to implement the PWM techniques. In this work, different sponses with better accuracy. In this work, a new FPGA-
pulse width modulation techniques have been studied and based Wavect real-time prototype controller (Xilinx
implemented by using a MATLAB/Simulink environment. ZYNQ-7000 SoC) is introduced to verify the effective-
The simulation results have shown that the SVPWM technique ness of the controller for the existing PWM algorithms.
is better than the other conventional methods in terms of
low total harmonic distortion (% THD) and better DC bus • Real-time digital controllers are useful for industrial
utilization. Then, a new FPGA-based Wavect controller is control system applications to monitor the data continu-
used to implement the conventional SPWM and SVPWM ously.
techniques. The control algorithm can be easily implemented
• Further, Wavect controller can be a better choice for the
implementation of modern AC drives. This work can
be extended to PWM-based motor control algorithms.
