Abstract
An optimal load shedding strategy for power systems with optimum location and quantity of load to be shed is presented in this paper. The problem of load shedding for avoiding the existence of voltage instability in power systems is taken as a remedial action during emergency state in transmission and distribution sector.Optimum location of loads to be shed is found together with their optimum required quantity. L-Indicator index is in used for this purpose with a modified new technique. Applications to be standard 6 bus Ward-Hale test system and IEEE – 14 bus system are presented to validate the applicability of the proposed technique to any system of any size.
Highlights
The major objective of power systems is to supply electricity to its customers
Andrzej Wiszniewski [17] have formulated a new method for estimating the voltage stability margin, which utilizes local measurements and applied criterion is based on the very definition of the voltage stability
A simple new method is developed to determine the optimum location and the optimum quantity of load to be shed in order to prevent the system voltage from going to the unstable
Summary
The major objective of power systems is to supply electricity to its customers. During emergency state of the power system, it may shed partial loads to ensure the power supply to important loads, as the last resort to maintain system integrity. A relation between voltage stability indicator changes and load power to be shed is developed. 2. Mathematical Calculation for Load Shedding Using Voltage Stability Indicator- METHOD I. From conventional Newton-Raphson load flow we obtain a linear relation between changes in voltage phases/magnitudes and active/reactive power injections as:. Sub (15) in (8) we get a relationship between real and imaginary part indicators and injected power as:. A relationship between changes in indicators at load bus j and power injections at all load buses can be obtained: ΔBIj =S11ΔPj +S12ΔQ j (17). Sub (19) in (17and18) we get a relationship between changes of the indicator at bus j and changes in active power injected at the same bus can be obtained as ΔBIj =S11ΔPj +S12Pf jΔPj (20). Using Equation (28) reactive power to be shed at bus j can be obtained if the active power to be shed at bus j is known
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