Problem 2 Problem 1 demonstrates the dependency of the MW load upon voltage magnitude. The MW load may also depend upon

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Problem 2 Problem 1 Demonstrates The Dependency Of The Mw Load Upon Voltage Magnitude The Mw Load May Also Depend Upon 1 (46.78 KiB) Viewed 18 times

Problem 2 Problem 1 Demonstrates The Dependency Of The Mw Load Upon Voltage Magnitude The Mw Load May Also Depend Upon 2 (37.71 KiB) Viewed 18 times

Problem 2 Problem 1 demonstrates the dependency of the MW load upon voltage magnitude. The MW load may also depend upon frequency. Consider a power system load which follows the functional relationship: P(f) - PC *** (MW) for Osks 3 Where Pho is the system MW peak load and k is an exponent that is a function of the load type. For static loads such as heating, for example, the value assigned to k is 0. For rotating loads consisting of a large percentage of induction motors the value assigned to k varies between 1.0 and 3. Find by how much the system MW load will change, (in percent) relative to the MW system peak load Plo, if the system frequency drops from 60.0 Hz to 59.9 Hz. Assume an exponent k value of 2.0. Does the connected MW load will increase or decrease? Will the change in load due to the frequency drop will assist or hinder the control of frequency in the power system? Comment briefly your answer.
Problem 1 Electric utilities do not normally try to exert any control over the amount of power that their customers draw from their networks. However, in times of energy crisis the load may exceed the generating capacity of the utilities. The load connected to their grids must therefore be reduced if voluntary means fail, utilities may in the end have to disconnect (le, shed) their customers on some priority basis. Before this Tinal solution is adopted, utilities can reduce customer load gradually by reducing" voltage Consider an industrial heating load consisting of three identical 100 resistors connected in delta to a 34.5 kV (line-to-line), three-phase bus. 1. What MW load do these resistors represent if the 34.5 KV bus operates at 34,5 KV? 2. What load do the same resistors represent if the utility hosting this load lowers the voltage of the 34,5 KV bus by 10%? Note that the heating load behaves as a constant impedance (admittance) load If you work the problem correctly you will find that the voltage reduction causes an estimated 19% reduction in the MW load. This would seem a saving for the customer. Why is he not happy? Problem 2 Problem 1 demonstrates the dependency of the MW load upon voltage magnitude. The MW load may also depend upon frequency Consider a power system load which follows the