To solve the problem of the poor wireless signal in the use of charging piles in residential communities, this paper proposes a communication method using a power line carrier in the community charging system to achieve safe and reliable data communication. And the problem is that a large number of electric vehicles charging in a disorderly manner leads to an increase in the total peak load of the grid and affects the safe operation of the grid. In this paper, we propose to develop a suitable orderly charging plan to ensure the safe operation of the grid, with the least electricity price as the optimization target, and combined with V2G technology. The users are guided to charge during the valley period of electricity consumption, and when the grid operation load is too high, the grid operation pressure is linked by discharging electric vehicles to the grid. This strategy takes into account the security of the grid and the economy of the users, and to a certain extent, realizes the purpose of grid scheduling is to cut the peaks and fill the valleys, avoiding the sudden load change
Hidden failures have always been an important factor affecting the reliability of relaying protection in power systems. In this paper, starting from the hidden failures of relaying plate, a technique of detecting hidden failures of relaying plate based on transient faults recorder data is proposed. The method overcomes the disadvantages of low efficiency and high workload of traditional manual inspection of relaying plate, and reads the current state of relaying plate in a wide range based on transient faults recorder data after a grid fault, performs default values detection, associated setting values detection and relaying plate logic detection of relaying plate, and outputs a comprehensive relaying plate detection report. In the technical implementation, the dynamic configurability of the relaying plate channel name and the relaying plate default values are used, which greatly improves the compatibility of the method with both conventional and intelligent substations. The method has been tested in a provincial company of the State Grid and detected a large number of hidden failures in the relaying plate, eliminating hidden failures for the safe operation of the grid.
As the scale of electric vehicles continues to expand, the charging load of electric vehicles into the network has become an issue that cannot be ignored. This paper introduces the concept and development of ordered charging based on the current background of ordered charging research. The application architecture of ordered charging is summarized, and the advantages and disadvantages of centralized, distributed, and hierarchical control architectures are introduced. The current status of research on orderly charging is analyzed at four levels: steps and methods of load modeling for orderly charging, optimization objectives of orderly charging, optimization methods of orderly charging, and practical projects of orderly charging. The methods of load modeling for orderly charging are summarized, different optimization objectives of grid operation for orderly charging are introduced, and the advantages and disadvantages of different optimization algorithms are compared and analyzed. Practical projects on orderly charging illustrate the great potential of orderly charging. This paper points out four problems of communication, data security, market mechanism, and the number of charging stations that orderly charging is currently facing and proposes feasible solutions. The development prospect of orderly charging being more environmentally friendly, energy-efficient, intelligent, and safe is proposed.
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