Research on New Energy Protection Strategy Based on Zero-sequence Voltage and Current Balance Configuration

At present, due to the continuous access of new energy, in particular, the penetration rate of distributed power supply to the grid continues to increase, a flexible and smooth contact interface is needed to complete the efficient absorption of new energy in peak scheduling. The establishment of the energy storage station is based on the smooth interface of the provincial power grid peak regulation means, so that the energy storage, distributed power supply and load can be regarded as a coupling unit, and the health of the coupling unit can be improved by improving the protection performance within the unit, so as to achieve a high degree of integration of the power grid. At the same time, by analyzing the distribution of ground points in the network and the value of the zero-sequence fault quantity of the grounding system, this paper gives the choice of different grounding modes on wind field and solar power field collector systems and the choice of system-side grounding modes. At the same time, through the analysis of power-frequency overvoltage level and the size of the zero-sequence voltage, is given of the selection principle of reclosing mode of new energy grid-connected power station, which has guiding significance for engineering application.