Research on Power Flow Calculation Method of Multi Terminal Hybrid DC Grid Based on Multiple Control Modes

摘要

A power flow calculation method of multi terminal hybrid LCC-VSC DC Grid based on multiple control modes is proposed. Firstly, the power flow model of the DC network component is analyzed, and the steady-state model of the Hybrid DC grid is established. Then the classical Newton Raphson method is used to solve the equation which is established by the control mode, the control strategy of the DC grid and the power flow equations under various control mode according to the type of converter. Thirdly, the AC/DC hybrid network is decoupled by sequential method, and the boundary information of DC network and the boundary information of AC grid are processed, and the AC/DC hybrid grid is solved iteratively. Finally, an improved PSS/E example is given to verify the validity and accuracy of the proposed method which provides an accurate initial value for the electromechanical transient simulation of the multi terminal Hybrid DC grid.