| The work of energy saving and emission reduction is key and difficult point of our national industrial development. Therefore it is of great significance to develop energy consumption monitoring device aimed at dedicated enterprise users, and the coal, oil, natural gas and other resource can be saved by enterprises’ energy-saving diagnosis and energy audit work, meanwhile reduce environmental pollution and improve the production efficiency and value of enterprises. Now it’s urgent to focus on and save the energy shortage problems, and under this social and environmental background, it’s essential to pay attention on enterprises’ energy saving work and guide them implement correct energy-saving diagnosis work.By visiting and investigating we found that there is short of holonomic interior online electrical detection system or devices in most dedicated enterprise users, and generally the foreign high-end power quality analyzers that used in enterprises’ energy-saving diagnosis work have good performance, such as comprehensive data monitoring, but which don’t configure corresponding upper analysis software system, what’s more, their market prices are generally high for almost 70~100 thousand RMB, thus for those dedicated enterprise users, such numerous power quality monitors are needed when there are so many monitoring points, which causes high cost, and the enterprises are hard to withstand such high cost for added electric online monitoring system, at the same time, the daily productive process should not be obstructed during the work of energy-saving diagnosis.Therefore, it is need to develop an automatic and comprehensive system in which the energy-saving diagnosis work can be changed into standardized and normalized, while how to supply complete electrical energy consumption data for such a system is a focal point. Based on this background, a measuring device is developed to monitor and record real-time electrical energy consumption data of dedicated enterprise users online, the data processed in this device are stored in SD car and imported to the software subsystem via SD reader. On account of the type of measuring data, the software subsystem can actualize energy-saving diagnosis and energy consumption analysis work, and then can obtain the energy-saving diagnosis report, and the report can excavate the energy-saving potentiality of dedicated enterprise users and they can also know the whole electricity using configuration situation and this report can assist the energy-saving diagnosis and energy audit work of enterprise.Firstly, the domestic and foreign energy-saving and diagnosis technology was discussed, and so were the domestic and foreign embedded system microcontrollers and advanced power quality monitoring and analysis products through visit and investigation, moreover, the applied situation and data interface relation of such type of power quality analyzers in the energy-saving and diagnosis work was introduced in detail; as well the energy-saving and diagnosis content was introduced.Secondly, the key measuring and calculation method of important electric energy consumption parameters was studied in detail, that is, fast Fourier transform algorithm which is short for FFT, and especially for Decimation-In-Time(DIT) FFT algorithm and Decimation-In-Frequency(DIF) FFT algorithm; then, the power quality energy saving analysis method, transformer energy-saving analysis method, and electric motor energy-saving analysis method which applied in energy-saving and diagnosis work are studied at length. Meanwhile, the calculation method of 6 types of basic power quality electrical parameters was analyzed in detail, and also studied the energy losses calculation methods of transformers, reactive power compensation and energy-saving benefits; as well the energy-saving and diagnosis measures of electric motors were studied.Thirdly, the technological development of the energy-saving diagnosis device was introduced in detail, as well as its physical development and internal laboratory testing. The development ideas of designed device and its position and function in the whole energy-saving and diagnosis comprehensive system were first introduced. Then based on modular design idea, the device was designed into nine modules, and eight of them were introduced in detail about their structural and functional design, as well as their chip selections and operational principle. Next, the protel circuit principle diagram of motherboard and sampling board of device was designed, and its printed circuit boards were made, and its hardware program was debugged, meanwhile the device was assembled and its appearance was designed. Next, the modular hardware programs were designed and debugged on the CCSv3.3 hardware debug platform, and the points for attention during debug were given. Finally, the device was tested in laboratory and its testing results were given, and the testing signal output from KS833 standard source and the signal monitored by designed device were contrasted and analyzed in detail, and from which the accuracy of detection, precision, feasibility and practicability of device is verified. At the same time, the monitoring a record data file of device was given, and which validated that this designed device can record electric energy consumption data accurately and the data can be stored into SD card or U disk and then the data can be used by the comprehensive energy-saving diagnosis analysis software system. Three improving ideas of the designed device were illustrated briefly in the end.Fourthly, the design method of comprehensive energy-saving and diagnosis analysis upper software system was given and as well as its basic structure and energy-saving diagnosis operating principle. The data interface relation between the designed device and upper software analysis subsystem was elaborated, meanwhile, several energy saving analysis modules which constitute the upper analysis software system were introduced briefly, such as transformer module, electric motor module, reactive power compensation module, lighting installation module, power quality module, etc., their energy analysis and operating principle were stated. In the end, the characteristics and advantages of upper analysis software subsystem were discussed during implementing energy-saving and diagnosis work.Finally, the designed device was tested on certain dedicated enterprise user in Shaoguan city, Guangdong province, and the energy-saving and diagnosis work was implemented online in this enterprise, during the whole testing, the electric energy consumption data was measured and recorded in real-time and online for successive 24 hours, then the energy-saving and diagnosis work including the analysis of energy-saving benefits, reactive power compensation, harmonics, voltage deviation, three-phase unbalance, etc., was carried out based on the measuring data, through energy-saving and diagnosis analysis, the energy-saving and diagnosis analysis results and transformer energy-saving modification schemes of the dedicated enterprise user were given, which further verified the feasibility and practicability of designed dedicated energy-saving and diagnosis hardware device and upper analysis software subsystem.The work of this paper is supported by Science and Technology Projects of China Southern Power Grid. |
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