**What are the assumptions made in priority list method?**

No load cost are zero unit input-output characteristics are linear between zero output and full load there are no other restrictions startup cost are affixed amount.

**State the adv of forward DP approach?**

If the start up cost of a unit is a function of the unit is a function of the time it has been offline, then a forward dynamic program approach is more suitable since the previous history of the unit can be computed at each stage.

**State the dis.adv of dynamic programming method?**

It has the necessity of forcing the dynamic programming solution to search over a small number of commitment states to reduce the number of combinations that must be tested in each period.

**What are the known values in short term hydro scheduling problem?**

The load, hydraulic inflows & uit availabilities are assumed known. What is meant by telemetry system? The states of the system were measured and transmitted to a control center by means of telemetry system.

**What are the functions of security constraints optimal power flow?**

In this function, contingency analysis is combined with an optimal power flow which seeks to make changes to the optimal dispatch of generation. As well as other adjustments, so that when a security analysis is run, no contingency result in violations.

**Define the state of optimal dispatch?**

This is the state that the power system is in prior to any contingency. It is optimal with respect to economic operation but may not be secure.

**Define post contingency?**

This is the state of the power system after a contingency has occurred. Define secure dispatch? This is state of the power system with with no contingency outages,but with correction to the operating parameters to account for security violations.

**What are the priorities for operation of modern power system?**

Operate the system in such a way that power is delivered reliably. Within the constraints placed on the system operation by reliability considerations, the system will be operated most economically.

**What is meant by linear sensitivity factor?**

Many outages become very difficult to solve if it is desired to present the results quickly. Easiest way to provide quick calculation of possible overloads is linear sensitivity factors.

**What are linear sensitivity factors?**

Generation shift factors line outage distribution factors.

**What is the uses of line distribution factor?**

It is used to apply to the testing for overloads when transmission circuits are lost.

**What is meant by external equvalencing?**

In order to simplify the calculations and memory storage the system is sub divided into 3 sub systems called as external equvalencing.