2Direct Current Control+TJD3DiA+VL'V.ECdVcon.B2OSingle-phasevoltagesourcePWMconverterNote: Va must be greater than the peak of thesupply voltageVa >V
② Direct Current Control Single-phase voltage source PWM converter D1 D3 D2 D4 T1 T3 T2 T4 is Ls vs vconv A B L2 C2 Cd + - Vd + vL - s Note: Vd must be greater than the peak of the supply voltage. Vd V ˆ
Example 1: Consider thefollowingcircuit(a) Write the name of the circuit;(b)What is the requirement for the circuit operating properlyto the value of Vd;(c) What is the role of LC, filter?(d) Write out the phasor equation at ac side:(e)with DPF=0.5 (lagging), draw the phasor diagram at acside.T3T1isLID3D1A+VLVs *VaVconvBoT4T2PD2Do
Example 1: Consider the following circuit. D1 D2 D4 T2 T4 is vs vconv A B L2 C2 Cd (a) Write the name of the circuit; (b)What is the requirement for the circuit operating properly to the value of Vd ; (c) What is the role of L2C2 filter? (d) Write out the phasor equation at ac side; (e)with DPF=0.5 (lagging), draw the phasor diagram at ac side. T1 T3 + - Vd Ls D3 + vL -