CUED Publications database

Secondary frequency control with on-off load side participation in power networks

Kasis, A and Monshizadeh, N and Lestas, I (2019) Secondary frequency control with on-off load side participation in power networks. IEEE Transactions on Control of Network Systems. ISSN 2325-5870

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IEEE We study the problem of decentralized secondary frequency regulation in power networks where ancillary services are provided via on-off load-side participation. We initially consider on-off loads that switch when prescribed frequency thresholds are exceeded, together with a large class of passive continuous dynamics for generation and demand. The considered on-off loads are able to assist existing secondary frequency control mechanisms and return to their nominal operation when the power system is restored to its normal operation, thus minimizing user disruption. We show that system stability is not compromised despite the switching nature of the loads. However, such control policies are prone to chattering, which limits the practicality of these schemes. As a remedy to this problem, we propose a hysteretic on-off policy where loads switch on and off at different frequency thresholds and show that stability guarantees are retained when the same decentralized passivity conditions for continuous generation and demand hold. Various examples are discussed, and we verify our analytic results with numerical investigations on the NPCC 140-bus system.

Item Type: Article
Divisions: Div F > Control
Depositing User: Cron Job
Date Deposited: 31 Jul 2019 20:14
Last Modified: 25 Jun 2020 10:25
DOI: 10.1109/TCNS.2019.2934386