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ELECTRICAL TERMS
Related Terms Electrical Grid Capacity Factor
ELECTRONIC TERMS
COMPARISONS
Circuit Globe / Power Systems / Economic Load Dispatch
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Economic Load Dispatch
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Power System
Definition: The economic load dispatch means the real and reactive power of the generator
Classification of Substations
vary within the certain limits and fulfils the load demand with less fuel cost. The sizes of the
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power plants is connected in parallel to supply the system load by an interconnection of the
Single Line Diagram of
power system. In the grid system, it becomes necessary to operate the plant units more
Power Supply System
electric power system are increasing rapidly to meet the energy requirement. So the number of
economically.
Peak Value, Average Value and RMS Value Active, Reactive and Apparent Power Electrical Bus-Bar and its Types Emf Equation of a DC Generator Electrical Earthing
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and Battery
Reciprocity Theorem
Regulating Transformer
Eddy Current Loss
Formation of Bus
Excitation System
Admittance Matrix HVDC Transmission
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The economic scheduling of the generators aims to guarantee at all time the optimum
Regenerative Braking
combination of the generator connected to the system to supply the load demand.The economic load dispatch problem involves two separate steps. These are the online load
Thevenin’s Theorem Auto Transformer Armature Winding DC Machine
dispatch and the unit commitment. The unit commitment selects that unit which will anticipate load of the system over the required period at minimum cost. The online load dispatch distributes the load among the generating unit which is parallel to the system in such a manner as to reduce the total cost of supplying. It also fulfils the minute to the minute requirement of the system.
RLC Series Circuit RS Flip Flop
Basic Mathematical Formulation
Power Triangle Parallel Resonance
Consider n generators in the same plant or close enough electrically so that the line losses may be neglected. Let C1 , C2 , …, Cn be the operating costs of individual units for the corresponding power outputs P1 , P2 ,…., Pn respectively. If C is the total operating cost of the entire system and PR is the total power received by the plant bus and transferred to the load, then
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The equation (1) and equation (2) can be minimised as
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The above equation shows that if transmission losses are neglected, the total demand PR at any instant must be met by the total generation. The above equation is the equality constraint.
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This a constrained minimising problem. This problem can be solved by using Lagrangian
Loss
multiplier technique. Seismic Transducer
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where f is the equality constraint equation given by
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And is the Lagrange multiplier. Combination of equations (3) and (4) gives
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Equation (5) can be solved for minimum by determining the partial derivate of the function C* on variable Pi and equating it equal to zero.
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Since Ci is a function of Pi only. The partial derivates become full derivates, that is,
Therefore, the condition for optimum operation is
Since the dci / dp i is the increment cost generation for the generator. The above equation shows that the criterion for a most economical division of load between within a plant is that all the unit is must operate at the same incremental fuel cost. This is known as the principle of equal criterion or the equal incremental cost-loading principle for economic operation.
Related Terms: 1. Load Curve 2. Load Flow Study 3. Iterative Method 4. Load factor 5. Parallel Operation of the Alternators
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