Benefit Measurement and Allocation Methods for Nuclear-Pumped Storage Integration Under Multi-Market Environment

The rapid expansion of renewable energy has posed significant challenges for the power system, including supply adequacy and operational flexibility. Nuclear power, as a stable and clean baseload source, plays a significant role in developing a new-type power system. However, its weak modulation capabilities significantly constrain its peak shaving and frequency regulation performance. The integrated operation of nuclear power and pumped storage, known as “nuclear-pumped storage integration”, can not only compensate for energy shortages but also provide auxiliary services, making it a viable solution for ensuring regional power supply stability. Nevertheless, a significant problem resides in achieving an appropriate benefit allocation between the two entities. To solve this issue, this research presents a mechanism for measuring and allocating the benefits of “nuclear-pumped storage integration” operation in a diverse power market. First, an integrated operating model is built, together with a joint clearing model encompassing the spot energy market and frequency modulation ancillary service market. A full-chain cost–benefit accounting system is designed to evaluate the value of joint operations accurately. Second, by incorporating indicators such as peak-shaving compensation and participation degree, a benefit allocation correction factor is derived, and an improved Shapley value approach is proposed to enhance the rationality and incentive effect of the allocation scheme. Case study results suggest that the “nuclear-pumped storage integration” operation mode can significantly increase overall benefits. Moreover, compared with existing techniques, the suggested improved Shapley value method provides fairness and rationality in benefit allocation, offering a sound decision-making basis for advancing the “nuclear-pumped storage integration” model.