Dynamic security assessment in electric power systems

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6039013

Maghsoodlou, F

A new approach to dynamic security assessment in electric power systems is proposed. A power system is modeled as a dynamical system with random variable structure. Structural variations are caused by primary and secondary events. Primary events are state-independent disturbances representing line and unit faults and load changes and are modeled by random jump processes. Secondary events that represent forced line and unit outages and load sheddings are modeled through an aggregate representation of the protection system as random processes whose change in time corresponds to the crossing of switching surfaces by the state process. These switching surfaces are defined by the setting of the protective relays. Commensurate with this model a three-state decomposition of the operating conditions into normal, emergency, and partial load operating states is suggested. Transitions between these states are described in terms of set-valued mappings in the state-structure space. An illustrative example is given. The dynamics of the system are determined by the generating units interconnected through a passive network. A security measure for power system is suggested as the integral of the probability density over a subset of the state-structure space which characterizes the acceptable operating points defined from load and operating constraints.

• OSTI ID: 6039013
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200000 -- Fossil-Fueled Power Plants
29 ENERGY PLANNING, POLICY, AND ECONOMY
296000* -- Energy Planning & Policy-- Electric Power
ELECTRICAL EQUIPMENT
ENERGY SYSTEMS
EQUIPMENT
EVALUATION
FUNCTIONAL MODELS
LOAD MANAGEMENT
MANAGEMENT
OUTAGES
POWER SYSTEMS
SECURITY
SWITCHES