In a 3-phase inverter, three separate SPWM signals are generated for each phase, By comparing a high-frequency triangular waveform with three sinusoidal reference waveforms (one for each phase) to determine the pulse widths of the inverter's switching devices. . However, most 3-phase loads are connected in wye or delta, placing constraints on the instantaneous voltages that can be applied to each branch of the load. For the wye connection, all the “negative” terminals of the inverter outputs are tied together, and for the detla connection, the inverter. . Three-phase PWM power converters are mainly used either as motor drives or wind/solar inverters connected to the electrical grid. Other applications are FACTS, STATCOMs, dual-active bridges, DFIGs, etc. This conversion is achieved through a power semiconductor switching topology. in this topology, gate signals are applied at 60-degree intervals to the power switches, creating the required 3-phase AC signal. The inverter is build of gives the required output. In this chapter the concept of switching function and the associated switching matrix is explained. Lastly the. . A three-phase Voltage Source Inverter (VSI) with SPWM (Sinusoidal Pulse Width Modulation) is a type of inverter that converts DC voltage into three-phase AC voltage with sinusoidal waveforms. It works by varying the pulse width of a high-frequency carrier signal according to the instantaneous. . Three-phase power systems consist of three sinusoidal voltages, each offset by 120° from the others. The instantaneous voltages can be expressed as: where Vm is the peak voltage amplitude, ω is the angular frequency (2πf), and t is time. The 120° phase separation ensures constant power transfer and. .