Design And Realization Of Wide-area Simultaneous Measurement Device For Low Voltage Distribution Network

In our country, low voltage power distribution network structure is complicated, and the runtime state changes quickly. As the monitoring of power grids are mainly distributed in power plants and transmission side, it is difficult to realize real-time monitoring of the overall effectiveness at the distribution network form. In the complicated power system operation condition, it is not effective in time to get real-time information from the distribution network. When hair into a emergency situation, it’s difficult to implement effective strategies and applie to distribution network accurately. So a certain negative impact will exert on electricity side. In view of this situation, distribution network automation development degree is lag behind, we need to be developed a synchronous measurement device based on the distribution network, in order to realize the monitoring of the timely and effectively distribution network in our country, increase the stability and controllability of power grid, reduce power grid state change of the negative effects for electricity sides. At the same time, the device can get a large number of distribution network real-time running status information, provide powerful data support for power grid dispatching operation. This article main research content is as follows:(1) Introduces the complicated environment of low voltage distribution network in our country, points out the necessity of the phasor measurement device on the low voltage side. Introduces the synchronized phasor measurement device for synchronous phasor measurement technology at our country and abroad research history and progress.(2) Introduces basic principle of the synchronous phasor measurement; expounds the main algorithm of phasor measurement, and points out the advantages and disadvantages. Explains the wide-area synchronized measurement system, puts forward the whole concept of synchronous measuring device, and describes in detail the functions of the different hardware modules.(3) Introduces the all phase FFT algorithm in the synchronous measurement device, includes the algorithm of the principle, characteristics and realization method of the synchronous measurement device. Realise all phase FFT algorithm in the phasor measurement device, improve the measuring accuracy of the phasor measurement unit.(4) designs the hardware of the synchronous measurement device, including the signal conditioning module which is responsible for the voltage current acquisition part,the AD conversion module which is responsible for converting analog signals to digital signals, the TMS320F2812 minimum system which is responsible for overall control and data processing program, the GPU22 C LCD display and key module which is responsible for human-computer interaction,the CAN turn to the Internet Modules which is responsible for data communication and synchronous clock module which is responsible for providing uniform sampling time and the second pulse device.(5) Detailed the phasor measurement unit in software design process, including system initialization program, synchronous clock module processing time, pulse generator, modulus conversion program, all phase FFT computation program, CMD space allocation and man-machine interface control program.(6) Through the device’s overall calibration, improve the accuracy of device; Points module was carried out on the device debugging and commissioning, the stability of the verification device; On the basis of measuring devices will be installed to the more complex continuous monitoring node voltage change, transfer monitoring results passed the Ethernet module to the data center, the measurement results are further processing, and display the results. Measurement results verified the phasor measurement device can accurately reflect the voltage monitoring frequency fluctuations.