Study on Stability of Low-voltage Multi-terminal DC System Under Electric Vehicle Integration

The integration of the growing number of electric vehicles through the existing DC power distribution systems can reduce new power lines construction and save investment in power distribution equipment. The integration of electric vehicles will affect the stability of the system. In this paper, the state space model of low-voltage multi-terminal DC system is constructed. On this basis, the influence of electric vehicles as constant power load on system stability during integration is analyzed, as well as the sensitivity of variation of integration parameters to system stability, and the key parameters affecting the electric vehicles integration are determined. Furthermore, the key parameter configuration scheme for increasing the number of electric vehicles integrations is proposed, and the maximum number of electric vehicles integrations is analyzed. Finally, the effectiveness of the stability analysis method for the low voltage multi-terminal DC system which integrates electric vehicles is revealed through the example verification and simulation analysis.