Data-driven Coordinated AC/DC Control Strategy for Frequency Safety

TL;DR

This paper proposes a data-driven coordinated control strategy integrating AC and DC support to enhance frequency safety in power systems with high renewable penetration, reducing reliance on load shedding.

Contribution

It introduces a novel CEFC strategy that optimally coordinates emergency DC support and load shedding based on real-time data, ensuring frequency stability under uncertain conditions.

Findings

CEFC maintains system frequency safety effectively.

The strategy minimizes control costs during emergencies.

Simulation confirms high adaptability and prediction accuracy.

Abstract

With high penetrations of renewable energy and power electronics converters, less predictable operating conditions and strong uncertainties in under-frequency events pose challenges for emergency frequency control (EFC). On the other hand, the fast adjustability of converter-based sources presents opportunities to reduce economic losses from traditional load shedding for EFC. By integrating DC power emergency support, a data-driven coordinated AC/DC control strategy for frequency safety - Coordinated Emergency Frequency Control (CEFC) - has been designed. CEFC coordinates both the initiation and control amount of emergency DC power support (EDCPS) and traditional load shedding. Based on real-time power system response data, CEFC ensures system frequency safety at a minimum control cost under non-envisioned operating conditions and large power deficits. A sufficient condition where data-driven modeling errors do not affect the precision of the control strategy for power system frequency is rigorously provided. Simulation results demonstrate CEFC's adaptability, prediction accuracy, and control effectiveness.