Mathematical simulation of power conditioning systems. Volume 3. Simulation of elementary units. Results for boost, buck, buck-boost, shunt PWM. Final report

Results are presented of the hybrid simulation of elementary power conditioning units buck, boost, buck-boost and shunt PWM. For boost, buck and buck-boost, two operational modes were investigated: continuous and discontinuous conduction. Continuous conduction leads to bad performance of the basic unit and to a complicated correction network independent of current operating point, whereas discontinuous conduction provides for normal performance and a simple correction network, but dependence on current operating point. The shunt PWM behaves as a first order system since the solar array and switches are equivalent to a current source of a given value producing pulses on the output capacitor. The discontinuous conduction case applies also to the shunt PWM, except that its performance varies little with output current.