This paper presents an implementation of a carrier-based PWM (CBPWM) technique for three-phase four-leg voltage source generator with microcontroller using for generate voltage sag signal. Recently, the implementation of the 3D SVPWM for three-phase four-leg voltage source it seems to be the easiest way to generated voltage sag and it might be a software and hardware burden even for recent digital signal processor (DSP) systems but needs quite a bit of digital logic and computational power. Therefore, this paper presents a simple sag algorithm CBPWM technique for three-phase four-leg voltage sag source generator it’s very simple design, low-cost and can be easily develop and operate hardware structure. The proposed technique can be implemented with dsPIC30F microcontroller and testing algorithm compare with 3D SVPWM technique. The performance of proposed CBPWM strategy has been investigated and verified through simulations and experimental results for three-phase four-leg voltage source generator.
The voltage sags generator VSG it is suitable for most R&D and test labs to evaluate the performance of electrical equipment under 7 sags types conditions (device under test or a sag-compensating power quality conditioner), and THDv 3.9% lower than power quality standard and can test electrical equipment with balanced/unbalanced voltage sags, and phase shift. The sag generator will be tested with resistive (Tungsten Lamp) and inductive loads, the proposed method provides an effective method for voltage sag generation for the purpose of sag-compensating equipment testing and all tested based on IEC61000-4-11 and SEMI F47