Power-system model

The Central Electricity Generating Board is applying automatic control to some of the main functions of the Grid control centres and the generating stations. To facilitate part of this work a power-system analogue has been constructed. This is basically a 50c/s a.c. network with a unique simulation of generators and loads. A generator is simulated by a variable-frequency voltage behind a fixed reactance, and governor simulation is included, so that load excess or deficit will cause a change in system frequency. A load is represented by a voltage behind a resistance, the in-phase and quadrature components being separately varied to control the active and reactive power absorbed.