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Optimization of power sytem
 

Optimization of power sytem

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    Optimization of power sytem Optimization of power sytem Presentation Transcript

    • Our Experience, Concepts and Understandings
      Optimization of Power System Operation
    • Introduction
      Electricity generating companies and power systems have the problem of deciding how best to meet the varying demand for electricity, which has a daily and weekly cycle.
      This study essentially deals with the method of operating Electrical generating sets of different type, to get the economic power from them.
      The terms ‘Unit Commitment’, ‘Economic Dispatch’ and ‘Incremental Cost’ are widely used in this study discipline.
    • The steps for optimization
      Long Term System Planning
      Hourly and Monthly decisions
      -- Unit Commitment
      Instantaneous Dispatch decisions
      -- Economic Dispatch
      Short term system operation
      -- Load Flow Model
    • Economic Dispatch- Covered Earlier
      Energy Policy Act defines “Economic Dispatch” to mean “the operation of generation facilities to produce energy at the lowest cost to reliably serve consumers, recognizing any operational limits of generation and transmission facilities.” [EPAct 2005, Sec. 1234 (b)]
      Actually, For Power System Economic Operation, the installed generating capacity should be greater than the load at any specific moment
      This topic is covered in earlier presentation
    • Unit Commitment
      The electrical unit commitment problem is the problem of deciding which electricity generation units should be running in each period so as to satisfy a predictably varying demand for electricity.
      The problem is interesting because in a typical electrical system there are a variety of units available for generating electricity, and each has its own characteristics.
    • Unit Commitment- The Constraints
      UC problem is a complex optimization problem which requires rigorous enumeration of all feasible combination of the generation units.
      The Problem typically involve technological and economic constraints.
      Spinning Reserve
      Thermal Unit Constraints
      • Minimum Up Time
      • Minimum Down Time
      • Start-Up Cost
      • Shut-Down cost
      Hydro Constraints
      Must Run
      Fuel Constraint
    • Unit Commitment- Solution Methods
      Most common techniques are,
      • Priority-list Schemes
      -simplest method but enormous computational time
      -based on shut down rule
      -creates a priority list of units by an exhaustive enumeration
      • Heuristic Methods
      -Uses pre-calculated priority list and incorporate all the operating constraints heuristically.
      • Mixed Integer Programming
    • UC - Solution Methods (Continued.)
      • Dynamic Programming
      -advantage over PLS is reduction in the dimensionality of the problem
      -systematically evaluates a large number of possible decisions in a multi-step problem
      • Lagrange Relaxation
      -based on dual optimization approach
    • Dynamic Programming-Illustrated
      The objective is to find minimum cost from A-N.
      K=1,2…5= Hour
      At the end of each hour, a decision is taken to enter on which state.
    • Advances in Unit Commitment Problem
      Genetic Algorithm
      -The genetic based UC program starts with a random initial population (at T=0) at it computes the fitness of each individual.
      -Advanced level of GA is used like Fast Messy Genetic Algorithm (FMGA)
    • Various algorithms to UC Problem
      Ant Colony System ( S. P. Simon, N. P. Padhy and R. S. Anand)
      - foraging behavior of the real ants for finding its food from its start (nest) to its destination (food) is simulated to obtain the optimum solution.
    • A Practical Software: e-terracommit
    • A Practical Software
    • Power Generation Machines
      GE 9E GAS TURBINE
    • Power Generation Machines
      Rolls-Royce BV16 HFO Engine
    • Inside a power plant
    • Thank you
      Muhammad SamiulAlam
      m.samiul.alam@gmail.com
      ID 11161004, MSc(EEE)
      BRAC University, Bangladesh