Frequency Security Constrained Robust Unit Commitment for Sufficient Deployment of Diversified Frequency Support Resources
Kun Li, Xiaomeng Ai, Jiakun Fang, Shichang Cui, Yuang Feng, Dong Liu, Pan Gu, Weidong Qiu, Jinyu Wen
Abstract
This article proposes a frequency security constrained unit commitment (FSC-UC) model for sufficient deployment of diversified frequency support resources. Specifically, the diversities in generators’ inertial response capability, primary frequency response (PFR) ramping capability, and quasi-steady-state (QSS) PFR power capability are integrated into FSCs to ensure post-contingency frequency security. Moreover, we analyze the opposite impacts of upper/lower variable renewable energy (VRE) deviation, brought by the VRE uncertainties, on frequency security. Hence, an asymmetric robust re-dispatch strategy (ARRS) is proposed to handle the power balance and ensure frequency security robustness in all stochastic VRE scenarios. Case studies on a modified IEEE 6-bus system and a real provincial power system in Northwest China validate the effectiveness and scalability of the proposed FSCs and ARRS.