Modeling and Control of a Generalized Energy Storage Device for Stabilizing Frequency and Voltage Oscillations

摘要

Energy storage devices (ESD’s) find considerable attention for power utility applications and stability augmentation, especially with fluctuating renewable power portions. It becomes imperative to consider a generalized detailed modeling of these devices, which imbibe/capture the dynamics of the storage side as well as the grid side converters, in addition to the mathematical modeling of the intermediate DC link. We present a compact form of generalized ESD model (GESD) with two distinct controllers, viz., predictive step ahead control (PSAC) and heuristic fuzzy logic control (FHLC). While the reference command trajectories of the GESD active power are tracked using the aforementioned control schemes, a voltage-controlled reactive power modulation is adopted in this treatise. A 50 MW doubly fed induction generator run wind farm is also incorporated in the exemplar Western System Coordinating Council 9 bus system, to accommodate intermittent wind power penetration. Frequency and voltage amelioration are primarily focused using both strategies in a staggering wind background with a three-phase network contingency hitting the system simultaneously. It is found that GESD equipped with PSAC not only offers better frequency and voltage deviation damping, but also better overshoot curtailment than HFLC based GESD incorporation. The above findings are validated using a MATLAB/Simulink platform.