基于风险的输电断面经济输电功率计算

Risk-based Economical Transmission Power Calculation of Transmission Sections

为有效协调电力系统运行安全性和经济性,更合理评估输电断面最佳运行功率,文中基于安全稳定风险分析与定量评估,提出了输电断面经济输电功率的概念,即使得断面输电的经济效益与系统失稳风险代价之差获得最大值时的断面输电功率值,并将故障下使系统保持稳定的紧急控制代价作为系统失稳风险。给出了输电断面经济输电功率的实用化计算方法和调度运行应用的建议。实际大电网的算例表明,输电断面按经济输电功率运行,可在系统安全风险可控的基础上获得更好的经济性。

In order to effectively coordinate the security and economy of the operation of power systems,and rationally assess the optimum operation power of transmission sections,the concept of economical transmission power of transmission sections based on quantitative analysis of security and stability risk assessment of power systems is proposed. The economical transmission power is defined as the section transmission power when the difference of transmission economic benefits and power system instability risk gets the maximum value,and the emergency control cost under unstable contingency is seen as the instability risk of the power system.A practical method of economical transmission power calculation is proposed,and suggestions for power system dispatchers application are given.Simulation results of an actual large-grid test system show that better economic performance can be attained on the basis of the controllable power system risk provided the transmission sections operate at the economical transmission power.