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Digital Encoder Based Power Frequency Deviation Measurement

Authors: Syed Javed Arif, Saleem Anwar Khan, Mohd Ayyub Khan


In this paper, a simple method is presented for measurement of power frequency deviations. A phase locked loop (PLL) is used to multiply the signal under test by a factor of 100. The number of pulses in this pulse train signal is counted over a stable known period, using decade driving assemblies (DDAs) and flip-flops. These signals are combined using logic gates and then passed through decade counters to give a unique combination of pulses or levels, which are further encoded. These pulses are equally suitable for both control applications and display units. The experimental circuit developed gives a resolution of 1 Hz within the measurement period of 20 ms. The proposed circuit is also simulated in Verilog Hardware Description Language (VHDL) and implemented using Field Programing Gate Arrays (FPGAs). A Mixed signal Oscilloscope (MSO) is used to observe the results of FPGA implementation. These results are compared with the results of the proposed circuit of discrete components. The proposed system is useful for frequency deviation measurement and control in power systems.

Keywords: Digital control, Frequency Measurement, phase locked loop, verilog HDL, encoding

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[1] D. Gallo, R. Langella, M. Luiso, A. Testa and N. R. Watson, "A New Test Procedure to Measure Power Electronic Devices’ Frequency Coupling Admittance," in IEEE Transactions on Instrumentation and Measurement, vol. 67, no. 10, pp. 2401-2409, Oct. 2018.
[2] D. Fan and V. Centeno, “Phasor-Based Synchronized Frequency Measurement in Power Systems,” IEEE Transaction on Power Delivery, Vol. 22, No.4, pp. 2010-2016, October, 2007.W.-K. Chen, Linear Networks and Systems (Book style). Belmont, CA: Wadsworth, 1993, pp. 123–135.
[3] A. Lopez, J. C. Montano, M. Castilla, J. Gutierrez, M. D. Borras, and J. C. Bravo, “Power System Frequency Measurement Under Non-stationary Situations,” IEEE Trans. on Power Delivery, Vol. 23, No.2, pp. 562-567, April, 2008.
[4] C. T. Nauyen and K. Srinivasan, “A new Technique For Rapid Tracking of Frequency Deviation Based on Level Crossing,” IEEE Trans. on Power Apparatus and System, Vol. PAS-103, No.8, pp. 221-226, August, 1984.
[5] M. Ahmad, “Measurement of Power System Frequency Deviation Using a Microprocessor,” International journal of Electronics, Vol. 68, No.2, pp. 161-164, January, 1990.
[6] T. Kasparis, N. C. Voulgari, and C. C. Halkias, “A Method For the Precise Measurement of the Difference Between Two Low Frequencies,” IEEE Trans. Instrum. Meas., Vol. IM-34, No.1, pp. 95-96, March, 1985.
[7] M. Ahmad, “Power System Frequency Deviation Measurement Using an Electronic Bridge,” IEEE Trans. Inst. Meas., Vol. 37, No. 1, pp. 147-148, 1988.
[8] W. Ahmad, “A Simple Pulse Duration or Frequency Deviation Meter,” IETE Technical review, Vol.4, No. 6, p. 249-250, 1987.