Research on Three Phase Unbalance Compensation Device of the Distribution Network
A large number of unbalanced loads connected to the power grid will lead to the unbalanced three-phase power grid,affecting the economic and reliable power grid.This paper presents a negative sequence current compen-sation device suitable for medium and low voltage distribution network.The compensation device connects the reac-tor and capacitor to the power grid through the reverse parallel thyristor,adjusts the impedance to the power grid by adjusting the trigger Angle of the thyristor,and then adjusts the compensation current in the compensation device.In this paper,the power generated by positive sequence component,negative sequence component and zero sequence component in the three-phase asymmetric current is analyzed.The negative sequence power and zero sequence pow-er are supplied to the load through the compensation device,so that only the power generated by positive sequence current is exchanged between the grid and the load,and finally the negative sequence current and zero sequence current compensation is realized.In this paper,the power of negative sequence current and zero sequence current is analyzed,and then the impedance of the compensation device should be connected to the power grid is analyzed,and then the trigger angle of the compensation device is generated to control the impedance of the access to the power grid.In this paper,a simulation model is built to verify the method.The results show that the compensation device can realize the negative sequence current compensation and zero sequence current compensation.
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维普
