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The construction of the charging station and battery exchange station can ensure the development of the electric vehicles industry. In the paper, the difference of the charging station and battery-exchange station is investigated, including the economic cost and benefit of the different mode. In addition, the factors affecting the development of the charging station and battery-exchange station is...
To improve intelligence level of the rural 400V power distribution grid, a new scheme of smart power distribution management is introduced. Smart power distribution cabinets handled by ARM-LINUX based intelligent systems are employed, which have mobile (GPRS/CDMA/3G) networking capability to communicate with the local power dispatch center, so that each cabinet can transfer grid parameters and other...
The paper focuses on a type of generator sets, designing a generator set's monitoring detecting system, prototype circuit is designed, the serial communication between the MCU (Microcontroller Unit) and the PC (Personal Computer) is achieved, the anti jamming technology has been considered, and it uses VB (Visual Basic) to carry out the design of the background manager, the whole system is debugged.
Computer network is playing an active role in modern business management in power system. Nowadays, information power industry develops rapidely, highlighting the growing importance of information security, and the challenges are increasingly serious. This paper analyzes security risks in power enterprise network and proposes specific corresponding strategies.
This paper proposed a kind of new supervisory system of computer the distribution supervisory system of computer. The system is arranged through scattering, stratified control, which is developmental, and with powerful mutual operating ness etc. The practical experience of the system for eight years in Huajia (Henan) indicated that the system is reliable, safety, real-time and economy.
This paper proposes the approach of analyzing risk of deep excavation engineering based on fuzzy theory. By using fuzzy mathematical method, the risk assessment model is established, and a practical method on fuzzy comprehensive assessment on risk of deep excavation engineering is proposed, and the practicability of this method is verified in a real engineering projects.
This paper introduces the development of an effective low cost monitor system to assist the normal function and the maintenance of Overhead Contact System(OCS). The whole system contains a remote monitor centre, some local monitor centres and lots of monitor modules. All the communications are through wireless network. The paper also shows how such a system could be used for OCS monitor, and the detection...
Voltage sag has became the most concerned about power quality problems. Voltage sag source detection for power quality fault detection, diagnosis and to ease the formulation of strategy is necessary. This paper proposes a new method about voltage sag disturbance source location based on real current component. The product of the RMS current and the power factor angle at the monitoring point is employed...
Power Quality Problem (PQP) includes several kinds of problems such as harmonics and voltage sag. Locating PQP online can help take countermeasures, and it is very important. With help of mobile agents, PQP can be located with dynamically geographically changed agents. The Power Quality Management System (PQMS) is built on agents, and data transmission is implemented using Person to Person (P2P) and...
This paper has summarized the history of the development of the state monitoring system of the power transformer and introduced the present situation in research, especially the multifold comparison on different methods to diagnose the trouble in transformer. This paper not only takes the comprehensive analysis on the extant online monitoring equipments, which is based on DGA, and methods of trouble...
This paper addresses the problem of identifying the optimal location for power quality monitors.The proposed approach is based on using the integer programming-based model and PSO to solve the optimization problem. Establish a 0-1 sensitivity equation to form the constrains of integer programming by PSCAD/EMTDC.The proposed approach gives the minimum number of power quality monitors and their locations...
With the unceasingly development of the power system, the proportion of nonlinear loads is quickly increasing and harmonic sources become more and more. It has serious influence on the power quality. In order to protect the safe operation of power grids and safe use of electricity, various level power quality networks are gradually formed, which provides a sound basis for the analysis and application...
As part of an infrastructure, tunnels are increasingly needed in an industrializing country. The quality control of a mega tunnel project is accordingly of importance and challenge. The main factors, which can lead to quality problems in tunnel construction, are analyzed in terms of object-oriented construction goals. Principles to implement quality control system are presented for the tunnel construction...
In order to find out the distribution of ploycyclic aromatic hydrocarbons of aerosol (PM10, PM2.5) and standardize the system of beneficiation reagent and provide basis for monitoring air, five sampling areas were set up from June, 2008 to October, 2008, in the period.The researchers collected samples of PM10, PM2.5 and pretreated them by the methods such as soxhelt extraction, concentrated by Kuderna-Danish...
For ultra supercritical boilers, steam separator is one of the most important parts in boiler pressure components, and its safety and reliability has the crucial influence on supercritical boilers during startup, shutdown and load following. This article takes steam separator for example to analyze the fatigue life of boiler pressure components and puts forward a short-cut calculation method. Based...
With the development of smart grids, power-quality monitoring becomes the one of the necessary functions. However, the installation of numerous terminal units usually would increase the cost for the wide-area measurement. In order to promote the deployment of distributed measurement, the low cost acquisition units are applied in this paper. By combining the proposed reconstruction technique for power...
In this paper, stormwater runoff from an urban traffic road and building located in Beijing, China, was characterized to measure the stormwater runoff discharge rates and pollutant concentrations. Based on monitoring, the runoff water quality on two underlying surface conditions was analyzed. The temporal dynamics of chemical oxygen demand (COD), NH3-N, NO3-N and total phosphorus (TP) were similar...
A new design of DSP+CPLD (Complex Programmable Logic Device) power quality monitor (PQM) is presented in this paper. In this PQM, DSP realizes real-time data processing and the control of peripheral devices through CPLD decoding the CPLD is used to generate control timing between DSP and peripheral devices. In this paper, the use of CPLD in design of logic interface between DSP and peripheral devices...
As the fault of key components for shield machine caused great economic loss and harmful social effect, An on-line condition monitoring and fault diagnosis system was designed for large-scale engineering machine(shield machine). At first the paper described the object to build remote monitoring center, and then introduced in detail monitoring equipment by machine loaded which consisted of four parts,...
Electric vehicles play an important role in the energy saving and emission reduction program. However, the influence on the power quality of distribution network caused by the electric vehicles becomes more and more serious, including the voltage drop and other aspects. Therefore in the paper, a flexible and ordered charging control system for the electric vehicles is developed. Firstly the electricity...
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