Technology Development Review and Economic Analysis of Power-Hydrogen-Chemical Integrated Energy Systems

With the signing of the Paris Agreement and the setting of governmental pledges globally for carbon neutrality, the development of hydrogen energy industry has become more and more rapid both in China and abroad, which also puts forward new requirements and opportunities for power systems and coal chemical industry. Technologies for Power-Hydrogen-Chemical integrated energy systems are evolving aiming to mitigate the challenges due to ever-increasing penetration of renewable generation in power systems, and to realize decarbonization of hard-to-abate coal chemical sector. In this paper, the recent development of Power-Hydrogen-Chemical integrated energy systems is summarized, the basic principles from the perspectives of water electrolysis - power system coupling and green hydrogen - coal chemical coupling are introduced, the key technologies from system integration, coordinated control, operation and maintenance points of view are discussed, an economic analysis based on a case study in Northwest of China is conducted, which demonstrates the feasibility of large-scale Power-Hydrogen-Chemical integrated energy systems in supporting energy transition and sustainable development in China.