Research on the Electricity Energy Pool Trading and Its Price Mechanism

As a regional power grid with the highest penetration of renewable energy, the China Northwest Power Grid is now facing with high curtailment of renewable energy, caused by the inefficient energy utilization, the serious marketization barriers between provinces and the immature market mechanism. To address these problems, this paper proposes an electricity energy pool (EEP) trading applied to the real-world case in China that is on the marketization process. Firstly, the EEP trading model is established, based on the economic dispatch model in two provinces whose power resources are complementary. Secondly, the price mechanism of the EEP is made up of two parts: system marginal price calculation and settlement of the unbalanced electricity (UE) within the whole month. Then, the benefit of the EEP trading is presented by comparing the rate of the curtailment in the wind and solar generation whether there is the EEP trading between the Shaanxi Power Grid and the Gansu Power Grid from day to month to year. Finally, the monthly UE of the EEP trading and its price are calculated, which verifies the effectiveness of the EEP trading and its price mechanism.