Fig. 1. A distributed power system comprising an upper management system.
Fig. 2. Conventional RMS calculation algorithms.(a) Block diagram of H-RMS(Half-cycle RMS) algorithm, (b) Block diagram of M-RMS(Moving average RMS) algorithm.
Fig. 3. RMS value of classical calculation method.
Fig. 4. Blcok diagram of the proposed RMS value calculation.(a) Overall block diagram of RMS value calculation,(b) Internal block diagram of Phase shift.
Fig. 5. Phase compensation of Section 1 and Section 2.
Fig. 6. Phase compensation of Section 1 and Section 2. (a) Section 1 and Section 2 (4.2ms), (b) Section 1 (50us), (c) Section 2 (50us).
Fig. 7. Step response of voltage RMS calculation algorithm (Simulation results). (a) Phase voltage, (b) RMS calculation of methods.
Fig. 8. Error of RMS value according to change of grid frequency(Simulation results).
Fig. 9. Step response of voltage RMS calculation algorithm (Experimental results). (a) Phase voltage, (b) RMS calculation of methods.
Fig. 10. Error of RMS value according to change of grid frequency(Experimental results).
TABLE I SIMULATION AND THEORY DATA ACCORDING TO PRIME NUMBER
TABLE II SIMULATION PARAMETERS
참고문헌
- Bdew, "Generating plants connected to the medium-voltage network," Technical Guideline, pp. 1-130, Jun. 2008.
- Korea Electric Power Corporation, "Distributed power supply grid connection technology standard," pp. 1-18, Apr. 2015.
- J. Y. Lee, "A study on voltage sag detection of power quality compensator," Conference on Power Electronics, pp. 760-763, Jul. 2004.
- H. Hegedus, "Comparison of RMS value measurement algorithms of non-coherent sampled signals," Measurement Science Review, Vol. 11, No. 3, pp. 79-84, Aug. 2011.
- S. H. Cho, "Equivalent 10-Hz flicker index calcultation using half-cycle sliding window and recursive RMS method," Journal of Electrical Engineering & Thechnology, Vol. 60, No. 11, pp. 2017-2020, Nov. 2011.
- H. G. Jeong, "Design and control of the huge-capacity wind power systems," Ajou Univ Engineering Doctoral Thesis, pp. 1-162, Oct. 2013.
- K. Ding, K. W. E. Cheng, X. D. Xue, and B. P. Divakar, "A novel detection method for voltage sags," in 2nd International Conference on Power Electronics Systems and Application, pp. 250-288, Nov. 2006.
- V. Yang, "Coherent sampling solution for an electric power system," Texas Instruments Application Report SLAA570, pp. 1-18, Nov. 2012.
- W. Fan, "Frequency-response characteristics and error estimation in RMS measurement," IEEE Transactions on Industry Applications, pp. 1569-1578, Vol. 19, No. 4, Oct. 2014.