Determination of load block compositions in load-shedding schemes

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · IEEE Comput. Applicat. Power; (United States)

DOI:https://doi.org/10.1109/67.20552· OSTI ID:6495500

Tsang, C P ^[1]; Wong, K P ^[2]

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1. Univ. of Western Australia (AU)
2. Electrical and Electronic Engineering at the Univ. of Western Australia (AU)

Large disturbances, such as short-circuit faults on a power system, lead power plants into a transient operating mode. Disturbances may propagate over a wide area in the system and may affect groups of generators, loads, and the interconnected network. In some extreme cases, a network may be separated into islands. In these islands, the load demand and the power generated may not be balanced. When there is a deficiency in power generation, frequency and voltage will drop. A typical validation of frequency with time is shown in Fig. 1. If underfrequency occurs in an island, loads are rejected in stages by underfrequency relays according to a predetermined load-shedding scheme so that a balance of load and generation may be recovered and the nominal value of operating frequency may be regained. In the design of an underfrequency load-shedding scheme, it is necessary to determine (1) the maximum overload, (2) the number of load shedding states, (3) the amount of load to be shed in each stage, (4) the underfrequency relay settings, and (5) the load circuits that should be dropped in the load block at each stage.

• OSTI ID: 6495500
• Journal Information: IEEE Comput. Applicat. Power; (United States), Vol. 1:4
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
29 ENERGY PLANNING
POLICY AND ECONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ELECTRIC GENERATORS
ELECTRICAL FAULTS
INTERCONNECTED POWER SYSTEMS
LOAD ANALYSIS
DISTURBANCES
DYNAMIC LOADS
ENERGY BALANCE
ENERGY DEMAND
LOGIC CIRCUITS
PROGRAMMING
RELAYS
VARIATIONS
DEMAND
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ENERGY SYSTEMS
EQUIPMENT
POWER SYSTEMS
200104* - Fossil-Fueled Power Plants- Components
296000 - Energy Planning & Policy- Electric Power
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)