考虑不确定性和预想事故集的增强电压稳定在线电网拓扑优化方法研究

Studies show that network topology optimization fully utilizes the existing assets of power grid and is a practical easily implementing and low cost control method for enhancing voltage stability of power system. When the uncertainties in power systems and predefined contingency set are considered, the deterministic optimization model is no longer applicable, hence the study of this project focuses on the model and online solution methodology of voltage stability enhancement control considering uncertainty and predefined contingency set. The research includes the followings: (i) disclose the physical mechanism of the impact network topology optimization on saddle-node bifurcation; (ii) analyze the model of uncertainties in power systems and the impact of uncertainties on voltage stability, propose scenarios reduction method based on the problem of voltage stability ; (iii) design a unified model including network topology optimization and traditional voltage stability controls, build up the mathematical model of network topology optimization considering uncertainty/predefined contingency set for enhancing voltage stability; (iv) propose an applicable and online solution method through the study of the solution of nonlinear mixed integer programming problem and evaluate the proposed method in large-scale power systems. The aim of this project is to enhance voltage stability of power system and delay saddle node bifurcation, build up the online practical architecture including network topology optimization, and provide theoretical and technical support.

研究表明电网拓扑优化实现了电网现有资产的充分利用，可成为一种低成本的增强电力系统电压稳定的有效措施。但当计及电力系统中的不确定性因素和预想事故集时，基于确定性框架的优化模型不再适用，因此本项研究致力于研究考虑不确定因素和预想事故集的电压稳定增强控制模型及在线求解方法。研究内容包括：揭示电网拓扑结构影响鞍结点分岔点的物理机理；分析电力系统中不确定性因素的建模方法及其对电压稳定性的影响，提出基于电压稳定问题的场景消减方法；构建含电网拓扑优化和传统电压稳定控制措施在内的统一数学模型，建立考虑不确定性/预想事故集的电压稳定增强问题的数学模型；通过对非线性混合整数规划问题解决方法的研究，提出适用的在线求解方法，并在大规模电力系统中验证其有效性。本项目以增强电力系统电压稳定性、延迟系统鞍结点分岔的发生为目的，构建含电网拓扑优化在内的统一控制方法在线应用架构，可为电力系统的优化运行提供理论和技术支持。

优化电力网络拓扑结构是构建智能电网的基础环节之一，以往研究表明可以通过开断线路和优化母线运行方式提高电力系统的静态电压稳定性。在此背景下，本项目研究了风电不确定性对静态电压稳定的影响，研究了考虑预想事故和不确定性的电网拓扑结构优化模型与方法，建立了的计及预想事故集的电网拓扑优化模型，提出了一种基于群的开断线路和母线解列场景识别计算方法；建立了考虑不确定性的电网拓扑结构优化模型，提出了一种基于电压稳定的风电场景削减方法和基于四阶段的电网拓扑优化方法。通过本项目的开展，有力地推动电网拓扑结构优化在电力系统电压稳定方面的应用与推广。