access icon free Optimal dispatching method based on actual ramp rates of power generation units for minimising load demand response time

© The Institution of Engineering and Technology
Received 20/07/2020, Accepted 30/11/2020, Revised 15/10/2020, Published 05/01/2021

This study proposes a method to determine optimal load demand changes of power generation units, in order to complete a total load demand change for power grids in the minimum response time. The main feature is to exploit the information of actual ramp rates, which are the maximum changing speeds of generated powers in practice from power generation units. The proposed method is composed of two steps. First, actual ramp rates are estimated from historical data based on the piece-wise linear representations of generated powers. Second, optimal values of load demand changes are determined based on the solutions to an optimisation problem minimising the response time. A main challenge is on the uncertainties of estimated actual ramp rates and their effects on the response time. This challenge is resolved by exploiting Bayesian estimators to yield posterior probability distributions of the estimated actual ramp rates, from which the optimal response time and its confidence interval are obtained. Numerical examples are provided to support the proposed method and compare with existing methods.

Inspec keywords: probability; Bayes methods; optimisation; demand side management; power grids; load management; power generation economics; power generation dispatch; numerical analysis

Other keywords: minimum response time; total load demand change; piece-wise linear representations; historical data; optimal load demand changes; actual ramp rates; Bayesian estimators; optimal dispatching method; numerical analysis; yield posterior probability distributions; optimisation problem; power generation units; power grids

Subjects: Optimisation techniques; Other topics in statistics; Numerical analysis; Power system management, operation and economics

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