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Analysis on Regional Difference of the Whole PV Industry Chain from the Perspective of Policy
HUANG Bin, ZHAO Wei, LIAO Lida, XIAO Meng, HUANG Jialiang, XIE Peiling
, Available online  , doi: 10.16516/j.ceec.2024.2.18
  Introduction  The "Carbon Peak and Neutrality" strategy has put forward a new path for China's energy development, which restricts the use of traditional fossil energy, and promotes the Chinese government to increase its support for the development of the new energy industry. Photovoltaic, as a new energy which is the most accessible and has the widest coverage, has become the first choice to solve the current energy and environmental problems. However, if we want to increase its market scale and realize the vigorous development of photovoltaic industry, it is necessary to find out and solve the pain points and difficulties of the current stage.   Method  China's policy on the whole photovoltaic industry chain was combed and analyzed to explore the shortcomings of the photovoltaic industry incentive policy. Based on the data from 33 sample enterprises in the A-share market from 2000 to 2021, the DEA model was built and the integrated innovation benefits and scale benefits of China's PV industry under the guidance of policy were explored. And using the panel regression analysis method, the different impacts of different regional policies on the innovation capacity of the upstream, middle and downstream enterprises of the PV industry. were explored.   Result  The research shows that the policy subsidies have a more significant impact on the innovation benefits of upstream photovoltaic enterprises, which is positively correlated with the development of enterprises in the eastern region. While in the western region, the opposite is the case, and there are certain regional differences.   Conclusion  It is necessary to improve the preferential policy strength in the photovoltaic technology innovation level, and carry out a reasonable industry chain planning and layout in combination with the regional advantages.
Research Progress of Liquid Carbon Dioxide Energy Storage System Based on Different Liquefaction Methods
ZHENG Pingyang, HAO Jiahao, CHANG Hong, ZHANG Zhentao, YANG Junling, LI Yanan, ZHANG Jiajun, YUE Yunkai, JING Yanan
, Available online  , doi: 10.16516/j.ceec.2024.2.05
  Introduction  With the large-scale application of new energy, the challenges faced by the grid connection of new energy power generation are growing, and the importance of energy storage system is increasing. carbon dioxide energy storage (CES) technology is a kind of compressed gas energy storage technology emerging in recent years, with the advantages of high energy storage density, long service life and high design flexibility. For liquid carbon dioxide energy storage (LCES) technology, CO2 is stored as liquid phase in both HP and LP sides of the system, which has high energy storage density and strong operation stability.   Method  Firstly, the operation principle and key technical indicators of the LCES system was introduced and the importance of carbon dioxide liquefaction and common liquefaction processes were clarified. Then, the research status of CO2 liquefaction on the LP side of the LCES system was introduced, including the use of mixed energy storage working medium, self-condensation, the LNG cold energy, and the regenerator. The characteristics of each method were analyzed in detail.   Result  The research indicates that the application of regenerator is the most effective method. It is necessary to further analyze the challenges faced by current cold storage liquefaction technology and its development direction.   Conclusion  The research could provide guidance for the further development of CO2 liquefaction technology for the LCES system.
Thermodynamic Analysis of Highview Power's Liquid Air Energy Storage Pilot Plant
SUN Xiao, CAI Chunrong, LUO Zhibin, WANG Xiaobo, ZHU Guangtao, PEI Aiguo
, Available online  , doi: 10.16516/j.ceec.2024.2.07
  Introduction  Energy storage technology becomes an essential supporting technology to build a new power system with renewable energy as the main power source. Liquid air energy storage (LAES) is one of the emerging large-scale energy storage solutions, which is technically and economically feasible and has a wide range of application prospects. The pilot plant built by Highview Power is the only LAES for which test data have been made public. The paper aims to explore the thermodynamic principle of LAES and seek ways to improve the cycle efficiency of LAES.   Method  A thermodynamic model was established according to the process flow of Highview Power's pilot plant. The thermodynamic model was verified by the test data of the pilot plant. Exergy analysis was carried out. The influence of key operating parameters on the charging and discharging process was studied by the control variable method.   Result  The results show that the key equipment limiting the cycle efficiency are recycle compressor and evaporator. Increasing the compression pressure and post-throttling pressure, increasing the mass flow rate and inlet temperature of the cryogenic expander, and recovering the cooling capacity of the regenerator are beneficial to improving the liquefaction rate and reducing the energy consumption of liquefaction. Moreover, increasing the high pressure and the inlet temperature of turbine expansion unit can help to improve the output power and cycle efficiency of LAES.   Conclusion  Some improvement measures are put forward to improve cycle efficiency, such as recovery of compression heat, improvement of compressor isentropic efficiency and reduction of heat transfer temperature difference of evaporator.