Direct disturbance based decentralized frequency control for power systems

• Published in: 2017 IEEE 56th Annual Conference on Decision and Control (CDC) pp. 3271 - 3276
• Main Author: Khamisov, Oleg O.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.12.2017
• Subjects: Eigenvalues and eigenfunctions; Frequency control; Generators; Information exchange; Load management; Power system stability; Renewable energy sources
• DOI: 10.1109/CDC.2017.8264139

Due to introduction of renewable energy and demand response, currently used scheme of frequency control in power networks becomes less efficient. Additionally, in large scale networks centralized communication requirement is difficult to fulfill. In such network information exchange might not be available even between some neighbors. The control presented in this paper is aimed to work in distributed fashion, under the condition of limited information exchange. After disturbance appearance it allows to stabilize and restore frequency to its nominal value, so the power network would return into the state close to economically optimal one. Thus it can provide primary and secondary frequency regulation and partially replace tertiary frequency regulation. The control is developed so that it works only with an estimate of power imbalance, ignoring instantaneous value of frequency. Finite-dimensional convex optimization problem of control effort minimization is considered. The control is designed so it converges with an exponential rate and without oscillations to the solution of optimization problem. Asymptotic stability of control and frequency is proved. Numerical simulations include efficiency comparison with the traditional control.