Future distribution systems will be penetrated with massive power electronics (PE) devices. This paper classifies the dynamics of future PE-rich distribution systems into four categories: dynamics introduced by network, dynamics introduced by PE interfaces, dynamics introduced by control of PE interfaces and dynamics introduced by load, generation and battery energy storage system. The purpose of such a categorization is to facilitate the analysis and control design of future distribution grids as well as to investigate the cause of instabilities. As a gridedge technology, a PE interface named Power Electronics Intelligence at the Network Edge (PINE) is used in numerical studies to demonstrate these four categories of dynamics and show how each of them influences the system dynamics and stability.
The interest and possibilities of conducting steam gasification of biomass (SGB) assisted by concentrated solar energy (CSE) at high temperature as external heat source for applications at large scale is studied. First the different options to conduct SGB to produce syngas and hydrogen are analyzed. Thereafter the possibilities of integrating CSE in SGB are investigated, including the ways to transfer the heat to the reactor, as well as methods to increase fuel conversion efficiency and the solar share in the gas produced. Finally, some original ideas to conduct SGB with solid particles as energy carriers heated by CSE are proposed.
With the decline of subsidy policy and implement of “double credit policy” in new energy vehicle industry, business model innovation will play an increasingly prominent role in the new energy vehicle industry. By analyzing the characteristics of policies, technologies and business models of China’s new energy vehicle market, and based on sociotechnical transformation theory, this paper constructs a business model evolution model under sociotechnical transformation. Then base on this model, there exist seven business model evolution paths from the perspective of sociotechnical transformation. For China’s new energy vehicle industry, five typical business model paths are studied in depth from four factors: landscape, regime, technology niche and business model. The research shows that the business model evolution model under sociotechnical transformation can clearly interpret the business model evolution path of China’s new energy vehicle industry. With the development of China’s new energy vehicle industry in the future, the impact of policy regime on business model innovation is weakening, and technology niche plays an increasingly important role in business model innovation.
The vector analysis indicates that the heat recuperation depends not only on the values of heat transfer coefficient and temperature difference, but also on their coordination for the supercritical fluids. The splitting flow improves the coordination degree between temperature difference and heat transfer coefficient in low temperature recuperator, and increases the inlet temperature of heater and reduces the heat exhaust in the precooler, which leads to
the performance improvement of supercritical CO2 Brayton cycle. The present work is helpful to the system optimization and mechanism analysis of supercritical CO2 Brayton cycle.