Abstract
The paper is concerned with power active filters of high harmonics control system. Shunt active filter generalized structure was investigated. A functional unit responsible for generating a distortion signal of the circuit currents is considered in the structure of the control system. Two ways of isolating the distortion signal are analyzed: the instantaneous power method and the notch filtering method. The instantaneous power method (p-q theory) assumes the use of the Clarke transformation for the transition from a single-phase system of currents and voltages to a two-phase system. Then, the active and reactive powers are calculated, the variable components of which are determined by the presence of higher harmonic components. The allocation of variable power components is necessary for calculating distortion currents from the beginning in a two-phase system, and after an inverse transformation, and in a three-phase coordinate system. The second method consists in filtering the notch filter tuned to the frequency of the first harmonic of the current, and thus obtaining a distortion signal. Structural diagrams of systems constructed according to the methods are studied. Research and comparison of the systems were carried out by the method of simulation modeling. As the simulation results, the spectral compositions of the compensated currents of the power supply system with consumers having nonlinear current-voltage characteristics are given. Also, the values of the non-sinusoidal current coefficients were obtained during the simulation. The analysis of the obtained results made it possible to draw a conclusion about the most preferable use of the notch filtering method in the structure of the active filter control system.
Keywords
Control system, power active filter, simulation modelling, high harmonics compensation, instantaneous power theory, phase-locked loop.
1. Rozanov Yu.K., Ryabchinskiy M.V., Kvasnyuk A.A. Silovaya elektronika [Power electronics]. Moscow: Izd. dom MEI, 2007. (In Russian)
2. Boyarskaya N.P. and others. Sintez filtrokompensiruyushchikh ustroystv dlya sistem elektrosnabzheniya: kollektivnaya monografiya [Synthesis of filter compensating devices for power supply systems: collective monograph]. [ed. V.P. Dovgun]. Krasnoyarsk: Siberian federal university, 2014.
3. Boyarskaya N.P., Derbenev A.M., Dovgun V.P. Adaptive system for generating control signals for active harmonic filters. Polzunovskiy vestnik. 2011, no. 2/1, pp. 25-29. (In Russian)
4. Akagi H., Watanabe E.H., Aredes M. Instaneous power theory and applications to power conditioning. Wiley-IEEE Press, N. J., 2007. 375 p.
5. Akagi H. Active harmonic filters. Proceedings of the IEEE. vol. 93. 2005, no. 12, рр. 2128–2141.
6. Zhukov N.A. Application of the instantaneous power method in the control system of the active filter compensating device. Molodezh i nauchno-tekhnicheskiy progress: Sbornik dokladov X mezhdunarodnoy nauchno-prakticheskoy konferentsii studentov, aspirantov i molodykh uchenykh: v 4t [Young people and scientific and technical progress: Collected papers of the X International scientific and practical conference of students, graduate students and young scientists: in 4 volumes]. Vol. 4. Compiled by V.N. Roshchupkina, V.N. Uvarov [and others]. Gubkin, Staryy Oskol: Assistent plyus, 2017, pp. 227-231. (In Russian)
7. Mahni T. et al. Three-phase for-wire shunt active filter with unbalanced loads. Energy Procedia. 2014, vol. 50, pp. 528-535.
8. Klimash V.S., Svetlakov D.P. Analysis of physical processes of the compensator of reactive power with the symmetry of the network current and a new control principle. Elektro. Elektrotekhnika, elektroenergetika, elektrotekhnicheskaya promyshlennost [Electro. Electrical engineering, electric power industry, electrotechnical industry]. 2007, no. 5, pp. 18-22. (In Russian)
9. JenoPaul R.D.P., Raglend J. Design and Simulation of Phase Locked Loop Controller Based Three Phase Unified Power Quality Conditioner for Nonlinear and Voltage Sensitive loads // International journal of applied Engineering research, Dindigul. 2010, vol. 1, no. 2, pp. 234-243.
10. Horovits P., Hill W. Iskusstvo skhemotekhniki [The art of electronics]: Translation from English P. Horovits, Under the editorship of B.N. Bronina. Moscow: Binom, 2012.
11. Averbukh M.A., Zhukov N.A., Khvorostenko S.V. Evaluation of the level of higher harmonics of currents and voltages in electrical networks of reinforced concrete products plants]. Nauchnoye obozreniye [Scientific review]. 2016, no. 7, pp. 79-85. (In Russian)
12. Zhukov N.A. Comparison of control systems of active filter-compensating devices in nonstationary processes. Molodezh. Nauka. Tekhnologii: sbornik nauchnykh trudov Mezhdunarodnoy nauchno-tekhnicheskoy konferentsii studentov i molodykh uchenykh v 4 ch. [The youth. The science. Technologies: a collection of scientific papers of the International Scientific and Technical Conference of Students and Young Scientists in 4 parts] Ed. E.G. Gurovoy, S.V. Makarova. Novosibirsk: Izd-vo NGTU, 2017, vol. 4: Promyshlennaya elektronika. Energetika. [Industrial electronics. Power Industry], pp. 31-33.