基于PMU的电力振荡阻尼控制方法在通信中断与多时滞可再生能源系统中的应用

This paper presents a novel model-free power oscillation damping strategy for renewable energy (RE) system considering communication disruption and multiple time delays in control loops. First, a multivariate Ornstein-Uhlenbeck (OU) process-enabled online estimation method is developed for state-space modeling estimation only using measurement data. This estimation method is applicable to systems with different delays in each wide-area control loop. Subsequently, a novel wide-area power oscillation damper (POD) is designed for the renewable energy sources (RESs) and that is further reconstructed in a decomposition manner to achieve independently sub-control, which allows to retain better damping performance under communication disruption. After that, the POD parameter settings are carefully tuned, where the time delay and estimation error are considered, formulated as stability constraints using Razumikhin theorem, and solved via linear matrix inequality (LMI), yielding multi-dimensional robustness of the system, including operating conditions, time delay and communication disruption. Case studies in the improved 4-machine 2-area system and IEEE 39-bus system show that the proposed method can accurately estimate the state-space modeling of closed-loop system and effectively dampen power oscillations in time delay and communication disruption scenarios.