Self Evaluation questions
ELECTRICAL Department, RESTRUCTURED POWR SYSTEM by A R ABHYANKAR,
IIT Delhi, New Delhi.
Module 6
1. There is 1 MVAR reactive power requirement at bus ‘i’. Price of reactive power on bus ‘i’ if provided locally is INR 20 / MVAR. The price of reactive power provided by a generator at bus ‘k’ which is located 1000 km away from bus ‘i’ is INR 10 / MVAR. The system operator should buy reactive power from
a) Source at bus ‘i’
b)Generator at bus ‘k’
c)can't say
2.Two generators of same installed capacity have frequency droop characteristics of 4% and 5%, respectively. At the end of a certain operational time block, which generator will get more money towards frequency regulation?
3. In a simple two bus, single line system, ATC for ‘real’ power from bus 1 to bus 2 is zero. Bus 2 voltage is 0.85 p.u. and bus 1 voltage is 1.05 p.u. Bus 2 does not have any reactive power support. Can bus 2 voltage be brought back to nominal voltage by transferring ‘reactive’ power from bus 1 to bus 2? Justify your answer.
4. Enlist the ancillary services required for generation-load balancing.
5.What is the difference between spinning reserve and supplemental reserve?
6.What are the drawbacks of obtaining ancillary services using mandatory means?
7. Explain why co-optimization of energy and reserves is necessary?