Advanced Materials Research Vols. 1070-1072

Abstract: As wind power, solar and other new energy development, new energy itself has intermittent, fluctuation characteristics, which bring great challenges to the safe and stable operation of power grid. This paper will construct semi real object simulation system research platform with the RTDS real-time simulation system, storage controller, power amplifiers and other equipment, focus on control strategy of energy storage system in a Micro Grid, mainly grid PQ control, off-grid V / F control and two conditions of each conversion control technology.

Abstract: With the deepening of the smart grid constructions, the intelligent response behaviors of the industrial users should be fully studied. Strengthening power grid comprehensive service ability is to meet the requirements of interactive marketing. Under the smart grid, industrial user response degree is low. The main peak shaving potential of electrical equipment is limited. we should make full use of electricity price signals to guide smart electricity response behavior of industrial users.

Abstract: In this paper, the application status of diesel generator set and the purpose and advantages and disadvantages of its parallel operation are summarized in brief. Grid connected operation of multi diesel generator are analyzed mainly. The necessary conditions of grid connected operation, the safety and special protect environment of grid operation, as well as the foreign and domestic development status of grid connected control technology are presented. Finally the development direction of grid diesel generator is pointed out, and the concept of smart grid is proposed.

Abstract: The inherent drawbacks of the traditional power grid and distributed energy resources are increasingly restricting the development of power systems. The micro-grid integrating of a variety of new green energy and having perfect self-control can meet the load demand and achieve sustainable development of environment at the same time. The basic definitions, system structure, the control strategy and the last research of micro-grid through a comprehensive literature review are presented. The literature analyzes the power supply control, power quality control and overall control and points out the characteristics and deficiencies of each control mode. Finally, some prospects of micro-grid on research findings in China were proposed.

Abstract: In order to implement the power online marketing strategies, the power enterprises need to formulate development policy in line with customer orientation, which is in the basic of customer-centric. To do such research, the power enterprises should strengthen the management of users’ data and form a sound and efficient online marketing platform. Besides, according to this platform, there is a communication between companies and users, which may further enhance the competition of enterprises.

Abstract: The core value of smart grid lies in the satisfaction extent of stakeholder’s demand, thus to construct an evaluation index system for smart grid it is necessary to construct a stakeholder’s demand index set at first to access the satisfaction extent of stakeholder’s demand reasonably and roundly. We divide the index system into the demand index set and assessment index set. As the former represents the macroscopic features while the latter represents the microscopic factors of the smart distribution grid. As for the calculation of combination weight, the DEMATEL-ANP-anti-entropy weight method and the improved Grey incidence approach is proposed. The DEMATEL-ANP-anti-entropy weight method is used for demand indices’ weight analysis, while the improved Grey incidence approach is put forward for the evaluation on assessment indices. Results of applying the proposed method in practical case shows that the proposed method is valuable in following aspects: scientifically assessing the intelligent development level and effectiveness of distribution grid, analyzing and recognizing the grid’s operation condition and weak link, giving reference to planning and construction of smart distribution grid, and so on.

Abstract: The smart grid has important strategic significance to lead the development of electric power industry upgrading and enhance the comprehensive benefits on economy, society and environment. Started from power generation, transmission, transformation, distribution and utilization five links of strong and smart grid, combined with the practical situation of China's electrical power system, in line with the value creation paths of demonstration projects in different links, this paper put forward the comprehensive benefit research framework of whole industry chain of strong and smart grid, and the general model for different value of whole industry chain. This paper selected two demonstration projects, “Large-scale clean energy grid connection” and “intelligent electric vehicle power charging and transportation network”, for applied analysis; further the inner logic relationship of value creation was expounded; finally the expectation on further application of the model was explained.

Abstract: Micro-grid gives full play to the advantages of distributed power supply by low pollution and flexible power supply form. Micro-grid has good economic benefits and social environmental benefits. Core technology of Micro-grid, policy support and grid-connected mechanism are problems encountered in Micro-grid construction and operation. Based on the analysis of development situation on the Micro-grid operation, this paper classifies the Micro-grid investors. According to the main purpose of different investors, this paper analyzes the cost structure and income structure of Micro-grid operation. And on this basis this paper proposed the corresponding optimal objective function under different Micro-grid operation modes.

Abstract: Firstly, based on the structure of urban rail transit traction power supply system and the characteristics of typical dc microgrid, a concept of urban rail transit traction power dc microgrid was proposed in the paper, and the feasibility of photovoltaic generation system, fuel cells generation system and energy storage system gridded to urban rail transit traction power supply system were studied; and then the functions and advantages of the proposed traction dc microgrid were surveyed from energy-saving and power supply reliability; finally, based on analyzing the electrical characteristics of urban rail transit traction catenary, some key issues of urban rail transit traction dc microgrid technology to be solved were discussed.

Abstract: Microgrid reconfiguration plays important role in improving continuity of power supply especially in the event of fault within the power grid or microgrid connected to the medium voltage distribution network. Due to the fault in power grid, intentional islanding through static switch is one possible solution while, fault within the microgrid emphasizes microgrid reconfiguration to recover maximum affected loads in each isolated zone. This paper presents multiagent system based (MAS) approach in order to withstand stably and autonomously in the event of fault within microgrid or power grid. MAS approach includes negotiation agent (NA) for the entire microgrid and bus agent (BA) for each bus within each zone. NA is responsible for selecting a Dominant-BA from each zone and prioritizing the zones by using region weight coefficient (RWC) method. Zone having excessive power will recombine with the zone having lesser power for maintaining power quality of sensitive and less sensitive loads, while normal loads are shed.