Construction of boundary matched equivalents for offline load-flow-type studies and transient stability analysis

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

OSTI ID:6359636

Kontos, A C

Electric power systems are large interconnected networks which are increasing in size and complexity. The analysis of these systems grow in difficulty with continued network expansion and interconnection. This thesis addresses the topic of equivalencing and is motivated by the necessity to deal with the limitations of the conventional techniques. The major contribution of this research is the development of a boundary matching approach which can be used in off-line load-flow type studies and transient stability analysis. The boundary matching method is structured to: (1) avoid convergence problems by introducing realistic equivalent branch admittances, (2) preserve sparsity by eliminating the insertion of equivalent branches between boundary buses, (3) circumvent the need to use phase shifters, (4) allow the explicit modeling of external power generation and load, and (5) maintain the physical structure of the power system. The approach was tested for the construction of static equivalents using three diverse test systems: (1) the 6 bus El-Abiad and Nagappan system, (2) the 30 bus IEEE system, and (3) the 118 bus IEEE system. The constructed BM equivalents yielded accurate results for both the base-case and post-base-case operating changes. The modeling of external inter-group connections and the presence of local generation in the vicinity of the boundary buses were investigated. The boundary matching method was also evaluated for the construction of dynamic equivalents using: (1) the 6 bus El-Abiad and Nagappan system, (2) the 14 bus IEEE system, and (3) the 39 bus New England test system. The accuracy of the BM approach was based on its ability to generate equivalents which can accurately predict critical clearing times. The constructed BM equivalents generated accurate results for all study cases presented.

• Research Organization: Georgia Inst. of Tech., Atlanta, GA (USA)
• OSTI ID: 6359636
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
POWER SYSTEMS
ELECTRICAL TRANSIENTS
LOAD MANAGEMENT
BOUNDARY CONDITIONS
CALCULATION METHODS
CONTROL
ELECTRIC POWER
ELECTRIC UTILITIES
MATHEMATICAL MODELS
NETWORK ANALYSIS
OPERATION
PERFORMANCE TESTING
POWER GENERATION
STABILITY
ENERGY SYSTEMS
MANAGEMENT
POWER
PUBLIC UTILITIES
TESTING
TRANSIENTS
VOLTAGE DROP
240100* - Power Systems- (1990-)