Wednesday, September 17, 2008

Removal of slack bus with economic load dispatch

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Abstract:

             This  project removes the role of the slack bus for making up for all losses in a power system, a new variable Pib is viably annexed to the ELD. In general terms, the foregoing analysis has demonstrated the validity of the hypothesis that the burden of slack bus is removed and the total cost isslashed in comparison with the conventional power flow(Newton Raphson method) because of the maintenance of ‘equal incremental cost’ that was violated in the conventional power flow analysis.            
                                            Power System Layout

Regarding the future scope of the project the following considerations can be made:
                          In the current project the concentrated burden of the slack bus in an IEEE 14 bus system is removed by distributing all losses to each generator bus in the power system. This has been achieved by introducing a new parameter Pib in the economic load dispatch. It was observed that the consequently determined output turned out to be the distributed generation amount in the ELD sense which meant that every generator maintained equal incremental cost. 
                          This method can further be extended to larger power systems like a 39 bus system and other complex systems for the same results. Also this method can be further modified for better results; the economic load dispatch can be done without considering the losses and losses can be calculated after the completion of Power flow calculations. Now the generation at each generator will be given by                  
    Pgi=Pgi,sch +(loss*Pfi) and the power flow calculation for the newly distributed generation is performed.
Conclusion:
             The result describe that the fraction of flow picked upon the slack bus is economically allocated to each bus, leading to the explicit elimination of the slack bus in the proposed LF. 
             This becomes clear only when we take a look at the generators  in the proposed LF . The generator the amount of generation at generator 2 is 894.67 MW.  This value is lower than that of generator 6 whose coefficients of the cost function are exactly the same as those of generator 2. But in the proposed method, these values at two generators that have the same cost function are equal, in other words, the ELD sense is maintained in the proposed technique, while the conventional power flow calculation violates the ELD sense.
            As far as the total cost is concerned, it is worth making a comparison between the conventional power flow and the proposed power flow. We can note that the proposed technique is more reasonable in terms of the cost minimization.

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