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Multi-objective Power Transmission Expansion Planning Considering Power Transfer Capability

Posted on:2010-03-26Degree:DoctorType:Dissertation
Country:ChinaCandidate:G QuFull Text:PDF
GTID:1102360302966668Subject:Power system and its automation
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The power grid development and power transaction variation in deregulated environment as well as uncertainties in power system planning and operation brings new requirements on network power transfer capability. It also requires improving adaptability and flexibility of power transmission expansion planning results. Network power transfer capability is an important technical index to guide power system planning and operation to ensure system safety. At the same time, it's a significant signal to instruct the power transaction in power market. This dissertation has analyzed the method to improve the network power transfer capability under new challenges in power transmission expansion planning. It is carried out in the viewpoint of generation influence, network structure optimization and grid interconnection. The multi-objective power transmission expansion planning models are established to optimize network power transfer capability index. The main results in this dissertation are as follows:1) A novel multi-objective power transmission planning approach that considers bulk power injection effect is proposed. Bi-level planning model is adopted to simulate bulk power injection and outage conditions. Network expansion investment, regional generation reserve capacity and power support capability are optimization objectives. The planning results could deal with the requirements of bulk power injection effectively.2) A novel multi-objective power transmission expansion planning approach that considers generation capacity adaptability is proposed. Generation capacity adaptability index is introduced to evaluate network adaptability to power generation capacity output changes. Multi-scenario network expected load factor distribution is optimized to better system operation environment and enhance power transfer capability. The planning objectives are to improve power transfer capability and minimize multi-scenario load shedding as well as strengthen the operation adaptability and flexibility of planning result.3) A novel multi-objective power transmission planning approach that considers transmission surplus capacity utilization ratio is proposed. The sufficient power transmission capacity is technical support to system operation safety and contingency treatment. Transmission surplus capacity utilization ratio is used to evaluate branch transmission capacity margin and its utilization degree. The planning objectives are to augment system available transmission capacity, optimize network power transfer capability and transmission surplus capacity utilization effect to meet load development and dispatching requirement with least investment. It could reach the balance between network investment and transmission capacity augmentation.4) A novel multi-objective power transmission planning approach that considers transmission congestion and network transmission profit is proposed. The effective power transmission expansion could reduce the probability of transmission congestion and solve the long term transmission congestion problem. The yearly anticipated load supply income increment is used to maximize network transmission profit for power transfer capability improvement. The economic signals in power market could be used to guide network expansion planning and realize the resource allocation optimization and social benefit maximization. The multi-objective planning model could take transmission congestion, system economic and reliability index into account.5) A novel bi-level multi-objective regional power transmission planning approach that considers exchange power on tie lines is proposed. The partition optimization method is introduced to take the whole power system and power receiving end network operation characteristic into account. The bi-level planning model is established to solve this problem. The upper-level model could maximize exchange power on tie lines with important transmission corridor reinforcement and it's helpful to utilize energy and resource utilization globally. The lower-level model could meet the fast load growth in power receiving end network. The bi-level planning model could realize the interaction and affectation by transfer variables between the upper-level and lower-level planning models. Analysis and comparison on the 18-bus system and the 77-bus system proves the feasibility, validity and applicability of the proposed approaches in this dissertation.
Keywords/Search Tags:multi-objective power transmission planning, network power transfer capability, bulk power injection, generation capacity adaptability, transmission surplus capacity utilization ratio, yearly anticipated load supply income increment
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