• Impacts on switching off lights at the time of Covid-19: lessons learnt

    Jul 2020 / by SHAIKH SHAMSER ALI, RUCHI TYAGI

    Abstract: An appeal was made by the honourable Prime Minister of India to the citizens on 3rd April 2020 for switching off only lights at their respective homes on 5th April 2020 at 21:00 hrs for 9 minutes. It was a symbolic gesture to show the resolve and commitment of the nation towards fighting the pandemic with light and hope. Various state governments and other government agencies also suggested only to switch off the lights in a phased manner in order to keep the power distribution system through the grids in stable condition.

    Failure mechanism and vibration control for tower tube of wind generator under extreme climate

    Jul 2020 / by YANG MINGLIANG, WANG JISHENG, MENG WENJUN,WANG SHOUCHENG

    Abstract: The wind power tower is sensitive to wind loads with high aspect ratio. The failure characteristics and failure mechanism of the wind turbine tower structure are analyzed under the extreme climate conditions. Based on the principle of tuned mass damper theory, the suspension damper application in wind turbine tower structure is designed. The appropriate typhoon wind speed spectrum is selected. With the finite element software, the 3D model for tower structure is established and the control effect of the damper structure is analyzed. The maximum displacement and acceleration of the structure under extreme climatic conditions are greatly reduced after the suspension tuned mass damper being given. The efficiency of vibration reduction is 80.26% and 54% respectively. The results show that the response of displacement and acceleration for the damper are obviously decreased, which is beneficial to the safety of the tower structure under the extreme climate condition.

    Keywords: Vibration control, tower tube of wind, failure mechanism, extreme climate.

    A new authentication scheme and enhance authentication protocol for large scale metering in smart grids

    Jul 2020 / by LOU YONGMEI WANG YING, LI GEN

    Abstract: Advanced Metering Infrastructure (AMI) plays an important role in the development of the smart grid. AMI is a computer network, which has to face the cyber security issues inevitably. Safety certification is one of the many cyber security issues. AMI have a lot of accessible devices, therefore it needs a simple and secure access mechanism. IEEE 802.1x is widely applied in solving the problem of wireless LAN users access authentication. In this paper, we propose a modified version of IEEE 802.1x protocol to meet the special requirements of AMI. In addition, we applied the modified IEEE 802.1x protocol also in our newly designed AMI architecture based on IPv6, and discuss the details of the authentication process. Finally, we build the experimental environment. We realize the design of AMI architecture in this experiment, and use the authentication mechanism proposed in this paper in it. Experiments show that the proposed authentication mechanism can meet the special needs of AMI, and our newly designed AMI architecture based on IPv6 has a direct commercial value.

    Keywords: Smart grid, Advanced Metering Infrastructure, sensing architecture, authentication protocol, IEEE 802.1x, SCEP

    A hybrid optimization model to assess the investment benefits of biomass power generation enterprises based on AHP-FCE algorithm

    Jul 2020 / by ZHIBIN LIU XIN WANG, AISHENG REN

    Abstract: The biomass resources represented by crop straw is abundant in China, the biomass power generation has characteristics of good quality of power generated, high reliability and mature technology. It plays significant aspects in maintaining the safety of energy, optimizing energy structure, alleviating environmental pollution and promoting the economic development in the rural areas. Currently, the unit investment cost of biomass power generation is relatively high, which is equivalent to about twice of the same scale of traditional coal-fired power generation, and its economic benefit is poor. This article constructed the investment benefits evaluation model of biomass power generation enterprises based on analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE) from the three angles of economic benefits, environmental benefits and social benefits. The hybrid method can take full advantage of the characteristics of concise and practical, less quantitative data information needed and strong systemic, clear results. Combining of the two methods to evaluate the single evaluation object is one of the most appropriate strategies. The evaluation results showed that the membership degree of comprehensive investment benefits to more strong is 0.4861, the comprehensive benefits of biomass power generation enterprises in China are higher, and which has good development prospects.

    Keywords: Hybrid optimization model, biomass power generation enterprises, investment benefits, AHP-FCE algorithm.

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