The size of consumers' direct-purchasing electricity and the installed capacity of clean energy is growing rapidly in recent years in China. The conflict between the absorption of clean energy and the fulfillment of direct-purchasing electricity began to stand out especially in the process of day-ahead generation schedule which challenges the power dispatching. To solve this problem, this paper proposes a new generation right trading mechanisms for clean energy and the traditional one by introducing the concept of assignment price based on the current generation schedule. Besides, a compilation method of generation schedule to ensure the consumers’ direct-purchasing electricity based on the new mechanisms is proposed. At last, the validity of this method is proved by a case study based on IEEE 39-bus system. This work is supported by Smart Grid Integrated Demonstration Project Characterized by Comprehensive Interaction (No. 2013BAA01B02).