Design of Capacity Compensation Mechanism Based on Capacity Credit Evaluation

With the rapid advancement of new power system construction, the proportion of renewable energy in our country is continuously increasing, thereby posing a greater challenge to the reliability of the power system. Meanwhile, there is an increasingly severe issue regarding the loss of thermal power units as a dependable power supply resource. Although renewable energy can contribute to reliable electricity supply to some extent, its capacity credit remains low at this stage. Therefore, it is imperative to introduce a capacity compensation mechanism that ensures cost recovery for thermal power units and promotes improvements in the capacity credit of renewable energy units. This paper proposes a capacity evaluation method based on reliability calculation and designs a capacity guarantee mechanism that takes into account both thermal power units and renewable energy units. It analyzes the capacity credit and cost deficiency of each unit type, determines accounting principles for capacity compensation standards, and puts forward settlement, apportionment, and assessment methods for capacity compensation. The results demonstrate that a reasonable capacity compensation mechanism can ensure income for thermal power enterprises while effectively promoting active allocation of energy storage by renewable energy units to enhance overall power system reliability.