Research on the Economics of Multi-Energy Complementary Systems and Renewable Energy Integration in Medium and long-term and Peak Shaving Markets

Under the driving force of energy green transition and the “dual carbon” goals, the installed capacity of renewable energy in the new power system has grown rapidly. However, its intermittent and volatile characteristics have significantly increased the peak-shaving pressure on the power system and posed new challenges to the market-oriented accommodation of renewable energy. In response, the National Development and Reform Commission and the National Energy Administration issued the “Guiding Opinions on Promoting the Integrated Development of Power Source-Grid-Load-Storage and Multi-energy Complementarity”, advocating the optimization of peak-shaving capacity through multi-energy complementarity to improve the overall flexibility and adaptability of the system. Under the current framework of peak-shaving service rules, this study constructs a medium- and long-term joint peak-shaving market clearing model involving multi-energy complementary systems, comprehensively considering the economic operation costs of both thermal power and renewable energy. Using actual operation data from a certain region in Northeast China, simulation analysis is conducted to evaluate the role of the multi-energy complementary system in enhancing the market-oriented accommodation and market competitiveness of renewable energy. The results show that the wind-PV-thermal multi-energy complementary system achieved a total profit of 44.975369 million yuan in the medium- and long-term and peak-shaving two-stage market, significantly improving market competitiveness and economic benefits. At the same time, compared with external renewable energy, it reduced the market-oriented accommodation cost of renewable energy by 0.9994 million yuan. It significantly enhanced the energy supply security and operation reliability of the new power system, and has important theoretical and practical value for the large-scale accommodation of renewable energy.