基于暂态电压扰动范围判别的自适应低压减载策略

Adaptive Undervoltage Load Shedding Strategy Based on Disturbance Scale Discrimination of Transient Voltage

传统低压减载方案仅根据本地电压信息动作,未考虑全网暂态电压响应特征。分析系统暂态电压跌落与扰动范围的关系,并基于负荷节点的电压偏移量提出暂态电压扰动范围判别指标,将电压扰动类型划分为全网暂态电压扰动和局部暂态电压扰动。以该指标的判别结果为基础,综合考虑扰动后系统电压与频率的动态过程,构建基于暂态电压扰动范围判别的自适应低压减载策略,该策略采用2套自适应减载方案分别应对全网暂态电压扰动和局部暂态电压扰动。对IEEE 39节点系统的仿真结果验证了该策略在应对不同失稳场景时的有效性和优越性。

Conventional undervoltage load shedding（UVLS） scheme only focuses on local voltages without considering the response characteristics of transient voltage in whole gird. This paper analyzed the relationship between transient voltage drops and disturbance scale, proposed discriminant index for the disturbance scale of transient voltages based on the offset of voltage drops, and divided the transient voltage disturbance into two categories： the whole-grid transient voltage disturbance and the partial-region transient voltage disturbance. On the basis of the discriminant index results, an adaptive UVLS strategy based on the disturbance scale discrimination of transient voltages was constructed, with consideration on the dynamic process of voltage and frequency after the disturbance, which could solve the whole-grid transient voltage disturbance and the partial-grid transient voltage disturbance respectively with two adaptive load shedding schemes. Finally, the effectiveness and superiority of this strategy in different instability scenarios were verified by the simulation on the IEEE 39-bus system.