Research on Optimization for Units Start During Power System Restoration

Abstract

Considering units starting and network constraints and the concept of optimization period, a optimization model which is a typical multi-constraint knapsack problem is established to solve the selection optimization problem of units starting in power system restoration period in this paper, and the objective of the model is to maximize the total power generation capability. A relative effectiveness assessment based on a improving data envelopment analysis is adopted to select the initial units to be started, genetic algorithms are employed to solve the knapsack problem to determine the most reasonable units be started at the current time. Finally, IEEE-39 bus system simulation result proves that the proposed model is feasible and effective.

Global optimisation model and algorithm for unit restarting sequence considering black‐start zone partitioning

“…Since most of the thermal units do not have the self-restarting ability, determination of an optimal restarting sequence is necessary to ensure that as many units as possible could be restarted in the hot-start condition. So far, a number of researchers have investigated the problem related to the determination of unit start-up sequences [12][13][14][15][16][17][18]. A novel method utilising the concept of the multiple time-step modelling is proposed to reduce the complexity of unit restarting optimisation problem in [12].…”

High-temperature Corrosion of Water-wall in Supercritical Boiler

“…However, low NO x emissions are conflict with weakening reducing atmosphere, which needs to increase capacity of denitrification equipment to relieve pressure of NO x emission control [5]. But some papers suggest that changing combustion condition cannot effectively weaken reducing atmosphere [25].…”

“…Strong rigid jet cause turbulence of high temperature upper flue gas, prompting reducing ingredient oxidation, making fuel gas around water-wall neutral or oxidizing [27]. Sidewall air-blowing technology has now achieved a remarkable success on high-temperature corrosion prevention of the supercritical boiler [25]. However, using this technology is relatively complicated.…”

“…Applied sidewall air-blowing technology needs to reform boiler, and adjust the volume and angle of outlet air [27]. Meanwhile because of the increasing of the air volume in boiler, NO x emission is increased [25]. Improve Corrosion Resistance of Water-wall Tube.…”