中文摘要：

针对电网运行中面临的不确定因素以及传统确定性安全准则的缺点,将风险理论引入到发电优化调度中。从支路过载和节点电压越限的角度定义运行风险指标,采用效用函数度量故障后果以反映不同故障间的相对严重程度。构建基于风险的多目标经济调度（risk-based multi-objectiveeconomic dispatch,RBMOED）模型,该模型以同时降低系统运行风险和机组燃料成本为目标函数,并满足基态下的安全约束条件。为求解RBMOED模型,首先应用改进多目标差分进化算法获取运行风险和经济性之间的权衡关系,进而根据电网运行的协调性准则辅助调度人员进行决策。对IEEE RTS-79测试系统进行计算分析,结果表明,所提发电调度方法能给出全面的关于系统风险水平的量化信息,并且可辨识出电网中的薄弱环节。

英文摘要：

In view of the uncertainties existing in the operation of power grid and the drawback of traditional deterministic security criterion, the risk theory was introduced into the optimal generation dispatch. The operation risk index was defined based on line overload and bus voltage violation of limit, the utility function was employed to measure the severity in order to reflect relative severity among different contingencies. Risk-based multi-objective economic dispatch model was formulated, minimizing the operation risk and fuel cost was considered as objective functions, and the normal state constraints were taken into account. In order to solve the problem, improved differential evolution for multi-objective optimization was implemented to obtain the economy-security tradeoffs, then the compromise dispatch scheme was selected according to the coordination operation of power system. The proposed generation dispatch approach was tested on IEEE RTS-79 test system, the results show that the quantitative index that reflects security level can be provided, and the vulnerable parts of power grid can be identified.