Passivity-based control strategy of three-phase electric springs
In recent years,the concept of electric springs(ES)has been proposed to reduce the power quality caused by the large-scale integration of solar energy,wind energy and other new energy equipment into the power grid.Based on the derived mathematical model of three phase electric springs(TPES),the corresponding system model was built.Based on the passivity-based control(PBC)theory,the pas-sivity of the system was analyzed.The traditional PI control and passive control were used respectively to verify that the three-phase power spring can maintain the voltage stability on the critical load(CL).Through simulation and experimental verification,under the active power variation condition,the over-shoot of passive control is far lower than 13.7%of PI control,the adjustment time of 0.03 s is also lower than 0.07 s of PI control,and the static error rate of 0.000 2%is also less than 0.08%of PI control,indicating that the dynamic and static performance of passive control is better.In addition,compared with traditional PI control,passive control requires fewer parameters and has a simpler control system struc-ture.
new energyelectric springthree-phase electric springcritical loadpassivity-based con-trolpower qualityvoltage stabilization
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