Influence Types of Startup on Hydrothermal Scheduling

[...]the optimization results have been obtained that all units can be connected to the network on the hour from 19.00 to 20.00. Because at this stage optimization is done by using economic dispatch then the next consideration is to determine the actual power needs in each power plant that supplies the grid system. [...]the next calculation can be done with optimal power flow, i.e. by finding the minimum value of energy cost in each hour of operation plan for each plant that has been selected. 5.3.Optimization Energy Costs Optimal power flow is the optimization of electric power that is easy to do when using the objective function in the form of deterministic function. [...]for power flow calculation, the results of the simulation with startup type showed relatively little more spendthrift. [...]the use of startup types on energy cost optimization for hydrothermal systems is better when included in the optimization algorithm. Nomenclature vj Water volume of reservoir at time j qin,j Water inflows from the rivers into the reservoir at time j qout,j Water outflows from reservoir to generate the power at time j qres,j Water evaporation from reservoir to ambient at time j Δt Time interval calculation Pj Electric power generated at time j K Multiplied number of energy conversion ε Performance parameter of the hydropower plant Sux,j Startup condition (hot, warm, cool) S'ux,j Startup costs at unit-x, at the time j ux,j Binary condition for unit-x at a time j S'ux,j Startup costs with account of the startup type for unit-x, at a time j PDi Active power of the load on bus i PLi Active power flow through the line from bus i to k PGi Active power generated by the power plant on bus i θik = θi - θk Phase angle difference between bus i to k Gik Conductance cable from bus i to k Bik Susceptance from bus i to k Vmini Minimum voltage of bus i Vi Voltage variable of bus i Vimax Maximum voltage of bus i PGimin Minimum active power on bus i PGimax Maximum of active power on bus i QGimin Minimum of reactive power on bus i QGi Reactive power on bus i QmaxGi Maximum of reactive power on bus i, α, β, γ Parameters of unit cost variable there are depending on the type of power plant Received September 5, 2017; Revised December 20, 2017; Accepted January 12, 2018 References [1] Ignatius R Mardiyanto, Hermagasantos Zein, Adi Soeprijanto.