Electrotechnical Systems

95Simulation of Power Electronics Devices

voltages supply the block inputs, and the phase-to-phase voltages, which give thenat-

ural ring points when they cross the zero level, are formed in the block. The block

contains two groups of the circuits similar to those shown in Figure 4.9. Thering

pulses for the bridge that is connected to the star-winding are sent to the output PY,

and for the second bridge—to the output PD.

For the discrete version of the block, the sample time has to be specied and the

external signal F

req

has to be set.

The pulse generators in SimPowerSystems are classied as multichannel with

the linear reference signal. Their demerits are a nonlinear dependence of the output

voltage on the control signal and an inuence ...