Analysis, monitoring and control of voltage stability in electric power systems

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:6416425

Begovic, M M

The work presented in this text concentrates on three aspects of voltage stability studies: analysis and determination of suitable proximity indicators, design of an effective real-time monitoring system and determination of appropriate emergency control techniques. A simulation model of voltage collapse was built as analytical tool on 39-bus, 10-generator power system model. Voltage collapse was modeled as a saddle node bifurcation of the system dynamic model reached by increasing the system loading. Suitable indicators for real-time monitoring were found to be the minimum singular value of power flow Jacobian matrix and generated reactive powers. A study of possibilities for reducing the number of measurements of voltage phasors needed for voltage stability monitoring was also made. The idea of load bus coherency with respect to voltage dynamics was introduced. An algorithm was presented which determines the coherent clusters of load buses in a power system based on an arbitrary criterion function, and the analysis completed with two proposed coherency criteria. An algorithm was presented for identification of critical sets of loads in a voltage unstable power system, defined as a subset of loads whose changes have the most pronounced effect on the changes of minimum singular value of load flow Jacobian or generated reactive powers. Effects of load shedding of critical loads were investigated by simulation and favorable results obtained. An investigation was also done by sensitivity analysis of proximity indicators of the effects that locations and amounts of static var compensation have on the stability margin of the system. The feasibility of implementation of the analyses and algorithms presented in this text relies on development of a feasible integrated monitoring and control hardware.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (USA)
• OSTI ID: 6416425
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRIC POTENTIAL
STABILITY
POWER SYSTEMS
LOAD MANAGEMENT
ALGORITHMS
CONTROL
CONTROL EQUIPMENT
DATA ANALYSIS
ELECTRIC POWER
EMERGENCY PLANS
FEASIBILITY STUDIES
IMPLEMENTATION
MATHEMATICAL MODELS
MONITORING
ON-LINE MEASUREMENT SYSTEMS
REAL TIME SYSTEMS
SIMULATION
VOLTAGE DROP
ENERGY SYSTEMS
EQUIPMENT
MANAGEMENT
MATHEMATICAL LOGIC
ON-LINE SYSTEMS
POWER
240100* - Power Systems- (1990-)