Research On UPQC-based Supply Terminals For 400Hz Power System

400Hz power system based on power static converter,which has advantages of simple structure,high utilization,low cost and high reliability.However,the voltage sag caused by the cable impedance and interaction between loads can not be ignored,as a result,the Supply Terminals which can guarantee power quality is needed at every important Boarding Bridge.Series Power Quality Controller can solve the problem of voltage sag.The input factor is very low because input current is not controlled.UPQC is considered as the Supply Terminals,which can not only compensate the transient voltage fluctuations,but also correct the power factor.The detailed analysis of the UPQC principle is presented to understand the working modes in case of input voltage sag,normal,swelling.With the comparison of some control strategies based on the same phase compensation strategy,a direct control strategy without harmonic detection is selected.Moreover,the control parameters are designed by analyzing the independent control strategy of series converter and parallel converter.On the basis of theoretical analysis,a single-phase 3kVA Supply Terminal prototype is designed.The design of the Supply Terminal includes the design of the power circuit and the control system.A simulation model and the experimental prototype are established based on the designed parameters.The experiments results show that the Supply Terminal has the ability to compensate the grid voltage mutation and correct power factor with good stable and dynamic performance with different input voltage and load type.All the results prove that UPQC is suitable as the Supply Terminal for 400 Hz power system.