Hybrid Power Transfer Allocation Methodologies for Deregulated Power Systems
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This paper suggests two hybrid power flow tracing methodologies to allocate real and reactive power output of individual generators to system loads and flows. Both allocation procedures are conducted independently and it is based on current operating point of the system, computed through A.C load flow program. In real power allocation, the method first clusters the system into small groups of buses. Then an appropriate conventional power flow tracing procedure is adopted to obtain the contribution factors within each cluster of buses. The choice of the chosen algorithm lies on their limitations and suitability. Proposed reactive power allocation methodology adopts current tracing instead of power tracing. Based on solved load flow and the network parameters, the method converts power injections and line flows into real and imaginary current injections and flows. These currents are then represented independently as real and imaginary current networks. Since current networks are acyclic lossless networks, proportional sharing principle and graph theory is used to trace the relationship between current sources and current sinks. The advantages of the proposed methodologies are demonstrated by using a simple 4-bus system and the IEEE 14-bus system. The proposed methodologies provide better reliability and minimize the limitations of conventional power flow tracing methods.
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