Energy Internet is a new hot topic in the research of industry and academia at home and abroad. It is also the development direction of the energy industry, and it is possible to innovate the way of human life. The paper summarized the concept and connotation by surveying the domestic and international development of the Internet of Energy. The information technology architecture of the Internet of Energy is reviewed from the perspective of the integration of energy system and information technology. This article described the characteristics of power line carrier communication, and analyzed the role and status of power line carrier communication technology in the Internet of Energy. The challenges and opportunities that power line carrier communication faces in the Internet of Energy are analyzed. In the end, this paper discussed the future development of Internet of Energy. Through the “Internet +”technology though, it will integrate advanced information technology and energy systems, coordinate multi-energy networks, innovate energy system operation modes, promote industrial upgrading, and generate new economic growth points.
Polygeneration energy systems have been widely accepted because of their superiority over conventional stand-alone plants in energy efficiency and emissions control. Coal-based polygeneration system, especially producing methanol and electricity, will play an important role in Chinese sustainable developing energy system. Researches indicate that the parallel polygeneration system producing methanol and electricity with CO-riched gas once through (PCGOT) has higher comprehensive profitability and higher reliability, but the systemic and objective evaluation to PCGOT is lacking. In this paper, the matrix mode exergoeconomic method is adopted to analyze the PCGOT. Some indices, such as exergy cost coefficient, unit exergoeconomic cost, cost difference and exergoeconomic coefficient, etc. are calculated and analyzed by using exergoeconomics theory. Based on the analysis, the direction for further improvement is pointed out, and the energy flows with different qualities in different parts of system are given the rationally fixed prices. The calculated electricity cost is 0.22RMB/ (kW•h) and methanol cost 1118RMB/t while coal price is 500 RMB/t. In addition, the coal price sensitivity analysis is conducted, the results show that when the coal price reaches 800RMB/t, the electricity cost is higher than Shanxi province average on-grid power tariff 0.304RMB/ (kW•h) in 2011, when the coal price reaches 1000RMB/t, the methanol cost is higher than methanol factory prices 2000RMB/t at present.
Coal resource utilization system, based on circular economy, is an opening, complex and time-varying system. It composes of subsystems such as industry, population, economy and environment etc. Taking the industry subsystem as prime object, this paper builds its system dynamics model adopting the system dynamics method based on full life cycle. The adjustment parameters such as utilization rate of by-product of mining, the proportion of coal use in each industry and waste recycling rate etc. were confirmed. As a case of coal utilization system being designed, thirteen development projects belong to two types of scenarios were run on the model. The efficacy coefficient method was applied to analyze the simulation results and determine the comparatively best project of coal resource utilization system for the first time. The results indicate that the C4 among them are the best project comparatively, its waste emission is the least, and the benefits of economy, environment and society are the maximum. Research shows that extending industrial chain, increasing production proportion of high added-value product and raising waste recycling rate are beneficial to decrease coal-mining quantity for unit output value, protect coal resource and achieve sustainable development, namely that adopting circular economy development pattern is undoubtedly worthy of advocating for sustainable development of economy, environment and society.
Power line communication (PLC) is widely used in electric power Internet of Things (IoT). Its performance, including data rate and anti-interference ability, has made great breakthroughs from Narrowband PLC (NB PLC) to high-speed PLC (HPLC) in recent years. In the context of continuously improving functions, the power consumption of HPLC is gradually increasing, this is equivalent to increasing the line loss of power transmission, which has an adverse effect on the large-scale deployment of HPLC. This paper analyses the structure of HPLC chip and communication unit, mainly exploring the low power design technology from chip architecture design, frequency band selection, physical layer (PHY) design, and MAC layer process. Currently the latest HPLC chip has been developed successfully, and the corresponding communication unit have started large-scale applications, and lab test and field application results show the HPLC can well meet the power consumption requirements in electric power IoT.
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