| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Research Abstract |
The main purposes of this research are to establish hierarchical structures for power system operation and planning, and to develop algorithms for typical problems. Firstly, the function of economic load dispatch (ELD) was extended so as to incorporate dispersed cogenerating sources into the optimal operation of thermal generating units. For this algorithm, the price of thermal energy which should be decided validly was evaluated in detail so that the coordination between operation and short-term planning of power systems becomes possible.
As well as the load dispatching among thermal units, the problem of unit commitment should be optimized in short-term planning. However, this optimization must be also coordinated to long-term planning in which the constraint on energy consumption is included in addition to various conditions. The developed approach is based on the variable γ method in order to consider the fuel constraint, which determines yearly commitment of generating units under given maintenance schedules. Furthermore, the algorithm was improved successfully to reduce the computation time by modifying the formula for updating the γ.
In obtaining the generating strategies especially for long-term period, several undeterministic parameters, e.g. load demands, should be considered. From this point of view, a hierarchical structure for hydro generating units was established, which is composed of long-term planning, short-term planning and flexible operation. Numerical examples show the effectiveness of the proposed method because the vague factors are included in all processes.
Finally, a method for optimizing configuration of power sources was developed based on the model decomposition, in which photovoltaic systems and energy storage systems are incorporated. In addition to economic evaluation, the effect for reducing CO_2 was confirmed quantitatively.
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