Research on grid-planning methods for the integration of high-permeability renewable energy

Renewable energy has become an important way to promote the development of low-carbon trend due to its low energy consumption, greenhouse gas emissions and sustainable development. However, due to the randomness and intermittent output of renewable energy with high penetration rate in the grid, it may cause deterioration of power quality, transmission and distribution sufficiency, and power supply reliability. Moreover, renewable energy may reduce the accuracy of estimation and dispatch, and ultimately greatly decreases the security of the grid. This paper studies grid-planning and optimal decision-making methods for the integration of high-permeability renewable energy. By comparing the access point and outside-delivered power of high permeability renewable energy under different voltage levels and different grid divisions, combined with the economic and reliability indicators, the planning scheme is proposed. With the proposed scheme for renewable energy, the impact and adaptability to the integrated power grid have been greatly improved. The proposed planning method is utilized and effects are verified in the IEEE case with 118 buses for the integration of wind farms.