Transient stability assessment: integration with EMS and control center requirements

Electric utility companies around the world are experiencing new security challenges as they move towards deregulation of power system operation. Independent power producers, distribution companies, competitive economic transactions between buyers and sellers, open access requirements and free energy routing through the transmission system are putting a greater emphasis on online transient stability assessment (TSA). Most companies with stability concerns are willing to consider online implementation of TSA and the determination of remedial and preventive control actions for the operation of their power system. This paper describes the requirements for online TSA integration from an EMS control center user's point of view. DTS and study modes of operation are also presented for planning and current operation analysis. Functional and implementation requirements are described that will enable a successful online deployment of TSA in an EMS. Voltage security assessment (VSA) is included in all figures to complete the EMS and control center picture.