基于输电网结构优化的电网安全均匀调度

Power Grid Homogeneous Dispatch Based on Transmission Topology Optimization

提高电网运行均匀度有助于提高系统的运行安全性。输电网结构优化作为一种调度运行领域的新技术手段,通过在电网运行过程中动态选择最优网络拓扑结构,可以改善电网各元件潮流分布的均匀度。在传统安全均匀调度模型的基础上,考虑输电线路运行状态的灵活调节,提出基于输电网结构优化的电网安全均匀调度模型。为保证最优拓扑的鲁棒性,在优化模型中计及了线路N-1安全约束,使所得的线路开断策略不会降低系统的N-1安全性。针对该大规模混合整数非线性规划问题,基于校验添加思想形成高效求解算法以提高优化模型的计算效率。IEEE 30节点系统和IEEE 118节点系统算例的仿真结果表明,文中提出的优化调度方法能够有效地提高电网运行均匀度,相比于传统调度方法能够在充分挖掘现有电网输电能力的同时实现电网潮流的智能化灵活控制。

Improvement of power grid operation homogeneity is helpful to ensure a secure operation state. As a new technology in dispatching and operating area, transmission topology optimization could be utilized to improve homogeneity of power flow distribution by dynamically optimizing network topology. Based on traditional homogeneous dispatch method, a new model considering flexibility of transmission line status is proposed in this paper. To ensure N-1 reliability, N-1 security constraints are embedded into the homogeneous dispatch model. A ‘check and feedback＇ algorithm is introduced to solve this mixed-integer nonlinear programming（MINLP） problem. Simulation results in IEEE 30-bus system and IEEE 118-bus system show that, this method could effectively improve power grid operation homogeneity. Besides, operation status of transmission device can be optimized flexibly while improving power grid transmission capacity compared with traditional dispatch method.