Transaction-based power flow analysis for unbundling of transmission and ancillary services

This dissertation investigates major operating and pricing issues associated with unbundled transmission systems, including transmission loss allocation, parallel flow evaluation, transmission pricing, coordination of different energy trading markets, congestion management and transmission rights, dynamic voltage stability reserves studies and pricing of generator's reactive power support.; This dissertation presents a new AC flow-based unbundling technique, named as transaction-based power flow analysis (TBPF). The approach utilizes physical properties of the circuit to decompose complex power flows according to economic contexts of trades. Our approach accurately computes actual flow paths and power loss quantities associated with a bilateral transaction in a simple and fast manner.; This dissertation extends the TBPF analysis to solve complicated operating and costing problems associated with unbundled transmission services, such as loss allocations, parallel flow evaluation and ancillary services pricing in an OpCo market model. New transmission loss allocation methods compatible with PoolCo model and hybrid market structure are reported in this research. An extended OPF function is developed to coordinate two trading markets of PoolCo and OpCo, in a shared and stressed transmission grid.; This dissertation examines similarities and differences between two transmission reservation and scheduling protocols: Firm Transmission Rights (FTR) and Flowgate Rights (FGR). Their impacts on scheduling of bilateral transactions or point-to-point transmission services are thoroughly investigated through qualitative analysis and quantitative evaluation.; This dissertation also delves into newly arising voltage stability issues in the unbundled operating environment, and discovers that the generator's AVR capability has significant impacts on dynamic voltage stability margins, which can not be replaced by local control devices such as ULTC and switched shunt capacitors etc. Moreover, a new scheme of costing generator's reactive power support is presented, which emphasizes the difference between reactive power delivery and voltage control functions.; Finally, this dissertation integrates some research results into several MatLAB based teaching software to enhance the power engineering curriculum.