Dynamic Operation of a Storage Power Plant (SPP) with Voltage Angle Control as Ancillary Service

Abstract

It is expected that in the near future, the electrical power supply networks will be significantly revolutionized. Today's conventional power plant structures will give way to a novel, inertia independent (free from rotating masses) power plant system. Such power stations, called storage power plants, will possess storages for different generation speed together with power electronic converters. They will be able to integrate and store energy from renewable sources. Since such a system will not possess any flywheels or rotating masses, thus frequency control as utilized in conventional power plants will be redundant. All the control principles necessary involving spinning reserve, primary and secondary control depending on frequency will be substituted by a comprehensive angle control of the nodal voltages in the transmission and distribution network. However, to be deemed truly feasible, these storage power plants must be able to function efficiently when they are integrated with conventional power plants and renewable energy sources. Thus, in this paper, these power plants are connected with conventional thermal and hydroelectric power stations as well as wind power plants, in a single network, and their dynamic behavior is studied under nodal voltage angle control as the ancillary service.