Double-differentiated Capacity Compensation Mechanism for the New Power System

With the continuous increase in the penetration rate of renewable energy, renewable energy generation will gradually become the main body of power generation in the power system, occupying a dominant position on the power supply side. It is difficult for conventional generators to recover fixed costs in the electric energy market. At the same time, renewable energy generation needs more traditional power sources as support to ensure system stability due to its randomness, volatility, and intermittency. Therefore, to ensure the adequacy of the power generation capacity of the system, it is urgent to establish a reasonable capacity compensation mechanism to ensure the recovery of the fixed cost of flexible power sources especially thermal power. This paper establishes a systematic analysis framework for the adequacy of power generation capacity, designs a double-differentiated capacity compensation mechanism, and proposes a capacity compensation calculation method, which is based on the traditional calculation method of capacity compensation standard, can fully reflect the capacity value and flexibility value. Finally, based on the IEEE 30-bus system and an actual provincial power grid, case studies validate the rationality and feasibility of the double-differentiated capacity compensation mechanism.