Multi-channel DMA Based Design of Voltage Monitoring Using Synchronous Frequency Trace-Sampling Technique

Yuan Lei(NARI Group Corporation (State Grid Electric Power Research Institute))
Li Lei(Tianjin Pinggao Intelligent Electric Co. Ltd.)
Lei Xia(NARI Group Corporation (State Grid Electric Power Research Institute))
Mingxiang Liu(NARI Group Corporation (State Grid Electric Power Research Institute))
Yueming Cai(NARI Group Corporation (State Grid Electric Power Research Institute))
Jingtao Zhao(NARI Group Corporation (State Grid Electric Power Research Institute))
Mengyue Li(Nanjing Normal University School of Electrical and Automation Engineering)

Abstract

In order to eliminate the influence of frequency change on real-time voltage acquisition, a low-cost solution of voltage monitoring was proposed using the multi-channel DMA synchronous frequency trace-sampling technique. In-chip resources of the designed voltage monitor were fully utilized in hardware design to reduce external devices. The MQX RTOS was used to perform the functional tasks flexibly and efficiently; especially the Ethernet communication applications and USB device connection were realized using its TCP/IP protocol stack and USB driver. In addition, to ensure the safety of electrical records, data statistics and alarm information management were also implemented through the management of the storage in FLASH. The test results show that the voltage monitor designed in this paper has the advantages of accurate measurement, strong resistance to frequency interference and low cost, and can be widely applied in the field of voltage monitoring in distribution networks.

Keywords

Voltage monitoring; DMA; Synchronous sampling; Frequency tracing-sampling; MQX RTOS

References

Tong Weiming, Tong Chun, Chen Peiyou, et al. Design of power Quality Detection Device based on DSP+ARM Dual-core System [J].Electrical Measurement and Instrumentation, 2019, 56(18):51-57.

Cui Mengyu, Liu Wei, Ma Chao, et al. Development of multi-channel Portable Power quality monitoring Device based on PQDIF format [J].Measurement and Control Technology, 2017(02):115-119.

Chen J Y , Tao J , Huo L . Study on Communication Methods for Electric Power High-voltage Equipment Monitoring System[J]. International Journal of Online Engineering, 2018, 14(2):181.

Lin Mengna. Research and Design of voltage Quality Analysis Platform based on MQX Real-time Operating System [D]. 2017.

Tao Zhao, Deqing Long. Analysis on task scheduling operating mechanism of embedded real-time operating system MQX [J]. International Conference on Mechatronic Sciences, 2013: 1844-1847.

DOI: http://dx.doi.org/10.26549/met.v4i2.5692