Coordinated optimization among multi-cycle generation schedules

Generation schedule optimization means scheduling unit commitment, economic dispatch and auxiliary service of generators to minimize total cost for specified time scope by considering system balance constraints, generator operation constraints, grid security constraints, energy saving and emission reduction constraints. Generation schedule optimization is a continuous promoting procedure. In order to coordinate multi-cycle generation schedule optimization for yearly energy contract tracing dispatch mode, this paper presents a continuous generation schedule optimization infrastructure. The longer cycle generation schedule provide direction for shorter cycle generation schedule optimization. Then shorter cycle optimize generation schedule aimed at minimized difference with generation schedule derived from last longer cycle optimization considering latest forecast and grid operation information. As to eliminate the random power bias distribution among generators, four bias minimization objectives, which include sum-bias, sum-cost, minimized max-bias and minimized max-cost, and four relevant bias evaluation indexes are defined. Example analysis indicates that sum-cost function is most suitable for coordinated optimization among multi-cycle generation schedule optimization. Finally, a practical cooperation method between real time generation schedule and automatic generation control (AGC) is presented. Through the comparison between current output and next period generation schedule, the AGC program could determine whether participating in current ACE adjustment or not, and calculate adjustment magnitude. Application of the coordinated optimization among multicycle generation schedules could implement continuous optimization of generation schedule and loop control of generator.