Control Behaviour of Electrical Power Stations and Loads Operating in Interconnection

Abstract

In this paper there will be presented a comprehensive dynamic power system model considering the cooperation of power plants, electric loads and areas in interconnection. This long term dynamic model is suitable for the investigation of the control behaviour, especially in the range of seconds and minutes. Structure and performance are described by detailed block diagrams as well as by mathematical-relations: So the dynamic power system model consists of n areas being coupled by the variable line frequency and the n exchange power flows. Each area may contain up to m power plants as well as load-configurations. Steam power plants fossil or-nuclear heated as well als hydraulic power plants are regarded. Frequency dependent-consumer loads (ohmic resistances and speed controlled motors) as well as asynchronous motors are foreseen. The mathematical description of the nonlinear dynamic power system model is realized in the state space. For the determination of all those power system parameters being not published in literature up to now extensive measurements are performed in three insular power systems. The nonlinear simulation program system is built up in modular structure and is working perfectly. As simulation example the Western German power system interconnected with the remaining Western European power system is considered, wherein the control actions for a 2500 MW powerstep are investigated.