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Patent US10211637
Issued 2019-02-19
Fast Generation Adjustment Algorithm For Energy Management System
A method is proposed for real-time economic dispatch in power system operation, especially in systems that include renewable power sources that may cause heavy deviations from a generation schedule due to their uncertain outputs. According to the method an optimal generation schedule is obtained based on forecasted load data. This schedule has to be adjusted if the actual load and renewable energy source outputs unexpectedly deviate from the forecasted value. An algorithm employed in the method is capable of dictating generation adjustments which minimize total generation costs. The algorithm is a modification of the base point and participation factor method. It differs from existing methods in that a precise model of transmission losses is adopted in the algorithm to achieve higher accuracy in optimization. The proposed method also has significant advantage in execution speed so that it is suitable for real-time operation.
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- 1. In an electrical power system having buses, power generators and loads, a method of minimizing total generation cost in real-time economic dispatch within the power system, comprising the steps of:
calculating an original power generation schedule for the power generators in the power system based on a forecast of the loads and the fuel cost of operating each generator; in real-time operation, in response to a deviation of load from the schedule, calculating by a computer in the energy management system the optimal generation adjustments to the original power generation schedule according to the algorithm where Δλ is the change of equal incremental cost before and after the generation adjustment, ΔPGi is the output adjustment for generator i, NG is the number of generators in the system; and changing the operation of the power generators through the energy management system in accordance with the calculated generation adjustments to the schedule.
