Holistic Multi-timescale Attack Resilient Control Framework for Power Electronics Dominated Grid
Amin Y. Fard, Mohammad B. Shadmand, Sudip K. Mazumder
Abstract
Power system is being upgraded by integrating wide-area communication substructures alongside smart devices. This upgrade might jeopardize the resiliency and security of the grid. Malicious activities could take advantage of potential vulnerabilities of the power-electronics-dominated grid (PEDG) and its heterogeneous components, which might lead to large-scale blackouts. The grid's edge houses numerous distributed resources that could be targeted as manipulation points. Attacks on operating set-points of smart PV inverters (SPVIs) are among the most likely malicious actions. These attacks could cause various issues like voltage fluctuations and frequency instabilities. According to grid integration standards, fluctuations on voltage could push the SPVIs or even the entire grid cluster to go islanded if they are not mitigated in a timely manner. Thus, the grid edge must be equipped with an all-inclusive control approach that alleviates voltage fluctuations within a specified interval. This paper proposes a holistic multi-timescale voltage control framework for dispersed SPVIs at the grid edge. The proposed framework consists of three different tiers with different responsibilities acting on different timescales. By implementing the proposed control framework, the SPVIs will participate in voltage regulation across the grid in occurrence of rapid voltage fluctuations in a sub-second timeframe, while keeping the entire distribution grid at an optimal operating condition in a long term. The proposed control framework is verified via simulation.