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The emerging global energy internet will connect major metropolitan cities together in the world. The power grid risk assessment of these big cities is very important and essential in securing the electrical energy system. In this paper, we propose a fuzzy comprehensive evaluation methodology to quantitatively assess the risks of a metropolitan city power grid system. A 2-level index and weight of...
In order to evaluate operational state of distribution network and facilitate the economic dispatch considering distributed generators, operational evaluation system of distribution network considering distributed generators is proposed. Furthermore, complex evaluation indicators of safety, power quality and economy are defined to evaluate distribution network with distributed generators as well....
Information and communication technology are the important support technology to effective energy distribution and consumption. With the national power reform and electricity sale opened, the new requirements and goals for user demand side management and response were put forward. The efficient mining and application of consumption data should be the important basis of demand side management and response...
This paper points out the problems of digital relay protection tester and the new requirements of relay protection testing in smart substation, combining the key technology of automation relay protection tester and takinG full advantage of the IEC 61850 standard, such as the unified protocol, the configurable model file, the specification of State Grid's “Six Reunification” as well. In this paper,...
Neighborhood Area Networks (NANs) are an important part of the smart grid, which is the last one mile communication in a Smart Grid Communication Network (SGCN), and a routing algorithm is one of the key technologies to improve the performance of NANs. Designing routing metrics is critical for routing algorithm of NANs. The goal of the metric is to choose a high-throughput path between a source and...
At present, the checking and designing of SCD's virtual terminal in smart substation are used by hand, and their rationalities are not easy to be verified. This paper studied a kind of searching and analyzing method of device virtual links based on historical SCDs. The virtual links are extracted from a number of existed SCDs, and stored into the database as the templates. For the SCD's receiving...
The conventional protection relays based on local signals, can be greatly enhanced in modern power grids. This article proposes a novel two-stage hybrid online fault detection algorithm based on wide-area protection and limited PMUs by wide-area communication network. In first stage, the wide-area algorithm calculates the lines' relative fault degrees on wide-area backup protections. After sorting...
Traditional electromechanical Energy Meters for electricity are now replaced by digital meters in domestic as well as commercial applications. The trend of automation can be incorporated in presently working digital energy meter to make it smarter. Idea is to design and implement a smart prepaid energy meter prototype having wireless communication facility. The proposed system presents a total electronic...
This paper propose a mathematical formulation of energy management problem and its implementation in an energy management system (EMS) for isolated neighboring multi-microgrids. Using the model predictive control technique, the optimal operation of the microgrids is determined by utilizing an extended horizon of prediction and evaluation, which allows a proper scheduling of the energy storage units,...
The real-time monitoring of status parameters, such as cell voltage and state of charge (SOC), is an important guarantee of the safety operation of the battery energy storage system (BESS). And the two-level architecture of hardware system which includes several battery management units (BMU) and the central management unit (CMU) is designed with the communication protocol and data conversion algorithm...
A hardware and software system design for transmission line inspection basing on quadrotor unmanned aerial vehicle (UAV) is proposed in this paper. To enhance the inspection efficiency, real time data processing for transmission line detection and following are required. This paper proposes the design of hardware structure, software structure, as well as a Kalman filter. The real flight experiment...
As the data transmission in smart substation is larger, and various packets are directly related to the proper and stable operation of substation, even of the whole power grid, cyber-security of smart substation becomes extremely important. This paper discusses the challenges and measures of smart substation cyber-security at present, which mainly includes: Incorrect configuration of network and equipment...
The smart substation is an important part of smart grid. By transmitting GOOSE (Generic Object Oriented Substation Event) and MMS (Manufacturing Message Specification) message among devices, the smart substation can realize the functions including, protection, control, alarm etc. Currently available smart substation secondary system's operation and maintenance analysis doesn't take account of the...
In order to capture all the fault points of voltage sag in distribution network, based on improved MRA method, an optimal allocation method of voltage sag monitors in multi voltage grades distribution network is proposed. All buses in the system are classified according to the voltage grades. When the fault point is located at different voltage grades of the system, the corresponding zero sequence...
This paper propose the traffic model of monitoring Electronic Data (E Data) and monitoring multimedia video in Cognitive Radio (CR) based Smart Grid (SG), the traffics are classified as four types with different priority computation formula. Only the top-k priority monitoring Secondary Users (SU) can be admitted for communication if the number of available free Primary Channels (PC) is k at the time...
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