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Power System Operation and Control by G. Sreenivasan, S. Sivanagaraju

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4

Optimal Unit Commitment

OBJECTIVES

After reading this chapter, you should be able to:

  • know the need of optimal unit commitment (UC)
  • study the solution methods for UC
  • solve the UC problem by dynamic programming (DP) approach
  • prepare the UC table with reliability and start-up cost considerations
4.1 INTRODUCTION

The total load of the power system is not constant but varies throughout the day and reaches a different peak value from one day to another. It follows a particular hourly load cycle over a day. There will be different discrete load levels at each period as shown in Fig. 4.1.

Due to the above reason, it is not advisable to run all available units all the time, and it is necessary to decide in advance which generators are to startup, ...

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