Coupling Law of Section Limit Under Static Voltage Stability in New Energy Delivery System

In the new energy delivery system, wind farm clusters are sent up to the main grid through outgoing channels of different voltage levels, and then transmitted to load centres for consumption. For large-scale wind farms, the outgoing channel is often composed of multi-level section, due to the limit of transmission section limit, the wind farms under the channel are often long-term power limitation, wind abandonment phenomenon is serious. And with the gradual expansion of the scale of the grid interconnection across the region, the limit of the multilevel section exists with interactive influence and tight coupling phenomenon. In this paper, based on the series-coupled delivery system, the expressions for the limits of each section are derived by decoupling the power-coupled lines through reactance splitting. And the influence of the power distribution on the section limits and the degree of influence are analysed, and the coupling law of the section limits is obtained. In addition, a model of a new energy delivery system in a province was built in PSASP, and the section limits were simulated using the continuous tidal current method to verify the correctness of the coupling law obtained in the theoretical analysis.