Frequency Security Constrained Robust Unit Commitment for Sufficient Deployment of Diversified Frequency Support Resources

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.