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OPF Calculation with Small-Signal Trajectory Constraints
Yang Yude,Mo Fujun,Liu Bin,Qin Zhijun 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
In order to avoid the complexity of obtaining the sensitivity in the usual optimal fl ow with small signal stability, which is easily result from the mere consideration of active power output optimization or the change of element model, a new model is proposed to improve the small-signal stability of the system by constraining the perturbation trajectory curve. Based on the time-domain simulation method, a power fl ow optimization model with small-signal trajectory constraint is established by extracting the damping ratio of the perturbation trajectory and forming constraints. The optimization calculation results of Western Systems Coordinating Council 3-generator 9-node system and China Electric Power Research Institute 6-generator 22-node system prove that the corresponding minimum damping ratio of the system increases with the increase of the constraint value of approximate damping ratio, which demonstrates the eff ectiveness of the model.