Analysis of Power Source Combination and Transmission Curves at the Sending end of Energy Bases

With the rapid development of new energy bases in China, optimizing the power source combination and transmission channel design is of great significance for enhancing the utilization rate of renewable energy and reducing grid peak-shaving pressure. This paper analyzes the power source combination alternatives of existing transmission channels and studies the multi-energy complementary characteristics of wind power, photovoltaic, and energy storage under different power source combinations. A transmission curve adapted to the load demand in different periods is proposed, and the investment and on-grid electricity price of each alternative are further calculated. The study shows that wind-solar complementary power source combinations can significantly improve the utilization rate of renewable energy, optimize the power export structure, and enhance the economic efficiency and regulatory capability of the grid. The recommended alternative's comprehensive on-grid electricity price is 0.2837 yuan/kWh, which is highly competitive in the market and provides a scientific basis for planning and implementing large-scale new energy export projects.