Dear Readers, Welcome to Economic Dispatch Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Economic Dispatch. These Economic Dispatch Questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries.
The objective of economic dispatch problem is to minimize the operating cost of active power generation.
The rate of change of fuel cost with active power generation is called incremental cost. The load balance equation , Pg-pd-pl=0.
The present operating point of the system is called base point.
The change in generation required to meet power demand is called as participation factor.
The objective is to minimize the thermal generation cost with the constraints of water availability.
Commitment of minmum generator to meet the required demand.
It is the term describe the total amount of generation availability from all units synchronized on the system.
These include quick start diesel turbine units as well as most hydro units and pumped storage hydro units that can be brought online, synchronized and brought up to full capacity quickly.
Minimum up time, minimum down time crew constraints.
Once the unit is running, it should not be turned off immediately.
Once the unit is decommited, there is a minimum time before it can be recommended.
If a plant consist of two (or) more units, all the units cannot be turned on at the same time since there are not enough crew members to attend both units while starting up.
The first allow the unit boiler to cool down and then heat backup to operating temperature in time for a scheduled turn on.
The second requires that sufficient energy be input to the boiler to just maintain operating temperature.
Priority list method dynamic programming Lagrange relation
A state consists of an array of units with specified units operating and the rest of the time.
The startup cost of a unit is independent of the time it has been offline.
There are no costs for shutting down the units.
The problem involves the long range of water availability and scheduling of reservoir water releases.
For an interval of time that depends on the reservoir capacities.
Dynamic programming composite hydraulic simulation methods statistical production cost.
It involves the hour by hour scheduling of all generators on a system to achieve minimum production condition for the given time period.
If any event occurs on a system that leaves it operating with limits violated, the event may be followed by a series of further actions that switch other equipment out of service.
If the process of cascading failures continues, the entire system of it may completely collapse.
This is referred as system blackout.
If one of the remaining lines is now too heavily loaded, it may open due to relay action, thereby causing even more load on the remaining lines.
This type of process is often termed as cascading outage.