基于多变量阻尼比灵敏度的有功调制方法研究

On-Line Active Power Modulation Based on Multi-Variable Damping Ratio Sensitivity

区域互联电网中存在的弱阻尼模式严重影响电力系统小干扰稳定性。为消除系统潜在弱阻尼模式,提出了一种以运行态势感知与发电机有功调制为基础,以提高系统阻尼比为目标的阻尼调控策略。首先,利用随机子空间辨识算法(stochastic subspace identification,SSI)从系统基础运行数据中提取系统振荡频率与阻尼比等,当系统存在弱阻尼模式时发出预警,进而应用多变量阻尼比灵敏度,筛选参调发电机组,并利用优化算法确定调整量,在线履行发电机有功调节,快速、高效提高系统阻尼,消除弱阻尼模式。最后,利用IEEE 4机2区系统和16机5区系统验证了所提方法的有效性和可行性。

In interconnected regional power grid,weak damping modes pose a great threat to small signal stability.To avoid further deterioration due to insufficient damping,this paper proposes a damping control strategy based on operational situation awareness and active power modulation of generator to improve system damping ratio.Firstly,stochastic subspace identification（SSI） is applied to extract eigen parameters from basic operational measurements,such as oscillation frequency,damping ratio,etc.If there exists a warning of weak damping,multi-variable damping ratio sensitivity is used to select suitable generators and optimization algorithm is adopted to determine amount of power adjustment.Through on-line generators power modulation,damping ratio is enhanced quickly and efficiently.Finally,simulations on IEEE 4-generator 2-area and 16-generator 5-area systems verify feasibility and effectiveness of this method.