计及负荷响应的电力系统低频低压联合减载方案  

A Response-Based Undervoltage-Underfrequency Cooperative Load Shedding Scheme for Power System

作　　者：李晔 LI Ye(State Grid Xiamen Power Supply Company,Xiamen 361000,Fujian Province,China)

机构地区：[1]国网厦门供电公司

出　　处：《电力与能源》2019年第3期283-287,共5页Power & Energy

摘　　要：传统的逐轮次低压减载和低频减载相互独立,减载时未计及负荷的频率电压特性以及频率电压之间的相互影响,在严重扰动下可能因为欠切或者过切负荷而导致系统失稳。提出了一种基于响应的电力系统低压、低频联合减载方案,该方案将负荷有功的动态响应解耦为负荷母线频率和负荷电压的动态响应,依据实测得到的负荷电压响应与频率响应来计算低压减载量,再计及离线计算的低频减载量从而构成综合减载量。IEEE 39节点系统的仿真结果说明,该方法与传统逐轮次减载方法相比,能使受扰系统的频率和电压恢复得更好,有效地保障了电力系统的电压和频率稳定性。Conventional undervoltage load shedding(UVLS) and underfrequency load shedding(UFLS) execute load shedding separately by turns without considerations on the load characteristics and mutual influences of voltage and frequency, which can easily cause system instabilities due to excessive or insufficient load curtailments. This paper proposes an undervoltage-underfrequency cooperative load shedding method based on system responses. This method uses the real-time measured system responses such as the frequency and the voltage to calculate the integrated load curtailments with considerations on the influences of voltage and frequency on load active power. Simulations on IEEE39-bus system have proved that this new method, compared with the conventional load shedding method, can make the frequency and the voltage recover better after the disturbances, thus protecting the power system from frequency and voltage instabilities effectively.

关 键 词：电力系统 低压低频联合减载 综合减载量 动态响应 

分 类 号：TM76[电气工程—电力系统及自动化]