Transient Stability of Droop-Controlled Inverter Networks With Operating Constraints

• 成果类型: Article
• 署名作者: Smith, Kevin D.; Jafarpour, Saber; Bullo, Francesco
• 署名单位: University of California System; University of California Santa Barbara
• 刊物名称: IEEE TRANSACTIONS ON AUTOMATIC CONTROL
• ISSN/ISSBN: 0018-9286
• DOI: 10.1109/TAC.2021.3053552
• 发表日期: 2022
• 页码: 633-645
• 关键词: Transient analysis; Power system stability; Numerical stability; Inverters; Voltage control; Mathematical model; Stability criteria; Droop-controlled inverters; Kuramoto-Sakaguchi model; stability of inverter networks; transient stability

摘要

Due to the rise of distributed energy resources, the control of networks of grid-forming inverters is now a pressing issue for the power system operation. Droop control is a popular control strategy in the literature for frequency control of these inverters. In this article, we analyze transient stability in droop-controlled inverter networks that are subject to multiple operating constraints. Using a physically meaningful Lyapunov-like function, we provide two sets of criteria (one mathematical and one computational) to certify that a postfault trajectory achieves frequency synchronization while respecting operating constraints. We show how to obtain less-conservative transient stability conditions by incorporating information from loop flows, i.e., net flows of active power around cycles in the network. Finally, we use these conditions to quantify the scale of parameter disturbances to which the network is robust. We illustrate our results with numerical case studies of the IEEE 24-bus system.