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1、中文 1950 字附 录附录 A外文资料Data CollectionAt present,the management of China csolleges and universitiesapartments|精.|品.|可.|编.|辑.|学.|习.|资.|料.are developing toward standardization and market development,accidents have occurred in electricity,whilesome colleges and universities have installed apart ment energ
2、y metering control system,however,thesesystems monitor the prevale nce of lowlevel,billingaccuracy is low,electricity -sharing,the network number o f the drawbacks of low extent.Therefore，improving the Energy Measurement m onitoring device has become more urgentThe issue of student hostels in colleg
3、es and universities to monitor energy metering system to study，design the student hostels in colleges and universities of the electricity data collector apartm ent.Data acquisition, also known as data acquisition, is the use of a device th at collect data from outside the system and enter into an in
4、terface withinthe s ystem.Data acquisition technology is widelycited in the various fields.Such as camera, microphone, all data collection tools.Data is being collected has been c onverted to electrical signals of various physical quantities such as temperature, water level, wind speed, pressure, et
5、c., can be analog, it can be digital.Sample collection generally means that a certain time interval (called the sampling period) to repeat the same point of data collection.The data collected are mostly instantaneous value, but also a feature withina certain period of time value.A ccurate data measu
6、rement is the basis for data collection.Data measurement met hod of contact and non-contact detection elements varied.Regardless of which method and components are measured object does not affect the status and me asurement environment as a precondition to ensure the accuracy of the data.Ver y broad
7、 meaning of data collection, includingcontinuous physical hold the collection across the state.In computer-aided mapping, surveying and mapping, desi gn, digitalgraphics or image data acquisition process may also be called, this time to be collected is the geometric volume (or include physical quant
8、ities, su ch as gray)data.1 In todays fast-growing Internet industry, data collection has been widely used in the field of Internet and distributed data acquisition field has undergone important changes.First, the distributed control applications in i ntelligent data acquisition system at home and a
9、broad have made great progres s.Second, the bus-compatible data acquisition plug-in number is increasing, and personal computer-compatible data acquisition system the number is increasing. Various domestic and international data collection machine has come out, the data acquisition into a new era.|精
10、.|品.|可.|编.|辑.|学.|习.|资.|料.Digitalsignal processor (DSP) to the high-speed data processing abilityan d strong peripherals interface, more and more widely used in power quality an alysis field, in order to improve the real-time and reliability.TheDSP and micr ocomputer as the center of the system, real
11、ize the power system signal collecti on and analysis. This paper based on the FFT algorithm with window interpola tion electric system harmonic analysis, improves the accuracy of the power qua lityparameters. In electricity parameter acquisition circuit, by highaccuracy tran sformer and improve soft
12、ware synchronous communication sampling method to conduct electricity parameters of the acquisition.The system consists of two main components, mainly complete data acquis ition and logic control.To synchronous sampling and A/Dconverter circuitpri ority . The DSP development board(SY-5402EVM),comple
13、te data processing. T HE signal after transformer, op-amp into A/Dconverter, using DSP multi -chann el buffer (McBSP) and serial port (A/Dconnected, data collection and operatio ns. At the same time, adopt PLL circuitimplementation synchronous sampling, can prevent well due to sampling synchronizati
14、on and cause the measuring err or. The overall system diagram of the A/Dconverter chooses the Analog to pr oduce stats redetect (AD)company AD73360. The chip has six analogue input channel, each channel can output 16 the digital quantity. Six channel simultan eous sampling, and conversion, timeshare
15、 transmission, effectivelyreduce gener ated due to the sampling time different phase error. SY - 5402EVMon-board DSP chip is TI companys 16 fixed -point digital signal processor TMS320VC5402. It has high costperformance and provide high-speed, bidirectional, multi -cha|精.|品.|可.|编.|辑.|学.|习.|资.|料.nnel belt cushion, be used to serial port with system of other serial devices di rectly interface.The realization method of ac sample：In the field of power quality analysi s,The fast Fourier transform (FFT)
