ABSTRACT
The flow of electrical energy between a fixed voltage supply and a load is often controlled by interposing a controller, as shown in Fig. 1.1. Viewed from the supply, the apparent impedance of the load plus controller must be varied if variation of the energy flow is required. Conversely, seen from the load, the apparent properties of the supply plus controller must be adjusted. From either viewpoint, control of the power flow can be realized by using a series-connected controller with the desired properties. If a current source supply is used instead of a voltage source supply, control can be realized by the parallel connection of an appropriate controller.
