Article

A Modified Harmonics Reduction Technique for a Three-Phase Controlled Converter

King Saud Univ., Riyadh
IEEE Transactions on Industrial Electronics (Impact Factor: 6.5). 04/2008; DOI: 10.1109/TIE.2007.908542
Source: IEEE Xplore

ABSTRACT Three-phase controlled converters have many applications especially in adjustable speed drives and renewable energy. A three-phase controlled converter is a good option in these applications due to its low cost, simplicity, and maintainability with respect to other solutions like a full-bridge insulated gate bipolar transistor converter or a Vienna rectifier. Line current harmonics in this converter is very high; therefore, a harmonics reduction technique is needed to remedy the problem. In this paper, an improved injection current technique is introduced to reduce line current harmonics. The optimal amplitude and phase angle of the injection current for different loads and firing angles have been mathematically determined. Simulation for this technique has been performed by using the PSIM simulation program. An experimental prototype has been built to verify the mathematical and simulation results. The simulation and experimental results show a sensitive variation in the total harmonic distortion of the line current for the amplitude and angle of injection current variations. The simulation and experimental results prove the superiority of this technique in mitigating the requirements for harmonics standards.

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    ABSTRACT: Three-phase controlled converters have many applications in the utility interfacing of renewable energy sources and adjustable speed drives as a rectifier or inverter. The utility line currents of these converters have a high harmonic distortion, which is more than the harmonic standards. This paper introduces a new technique for circulating the third harmonic currents from the dc-link to the line currents to reduce their harmonic contents. The proposed system uses a single-phase PWM converter to control the angle and amplitude of the injection current for each of the firing angle of a three-phase converter. A detailed analysis is introduced to achieve a relationship between the firing angle of the three-phase controlled converter and the power angle of the PWM converter. In addition, a detailed design for the other injection path components is introduced. A simulation and experimental work is introduced to prove the mathematical derivations. Analysis, simulation and experimental results prove the superiority of the proposed technique. NOMENCLATURE I f The third harmonic injection current. v a , i a The voltage and current of phase a. α The firing angle of the three-phase converter. θ on The angle of V on,3 referred to v a in the 180 Hz domain. Ψ The angle between V on,3 , and I f in the 180 Hz domain. Ψ opt The angle between V on,3 , and I f for the minimum THD in the line currents in the 180 Hz domain. Φ The angle between V a and I f in the 180 Hz domain. Φ opt The angle between V a , and I f for the minimum THD in the line currents in the 180 Hz domain. V m The peak value of the phase voltage. ω The angular velocity of the fundamental frequency. V LL The rms value of the line to line supply voltage. V dn The rms value of the voltage between points d and n. V fn The rms value of the voltage between points f and n. V on,3k The rms value of the (3k) harmonic of the voltage between points o and n. k =1, 2 , 3, 4, .……. a 0 , a h , b h Fourier coefficients. L dc , C dc Inductor and capacitor in the dc-link. m a Modulation index of the single-phase PWM converter.
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    ABSTRACT: Three-phase controlled converter has many applications in interfacing renewable energy sources and adjustable speed drives as a rectifier or inverter. The utility line currents of this converter have high harmonic distortion more than the harmonic standards. This research introduces a new technique of circulating third harmonic currents from dc-link to the line currents to reduce its harmonic contents. The new proposed system uses single-phase controlled converter to control the angle of injection current for each firing angle of the three-phase converter. A detailed analysis is introduced to achieve a relation between the firing angles of three and single-phase controlled converters. Also a detailed design for other injection path components is introduced. A simulation and experimental work is introduced to prove the mathematical derivations. Analysis, simulation and experimental results prove the superiority of the proposed technique.
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    ABSTRACT: The 3-phase diode bridge rectifier has the least line current distortion among 6-pulse rectifiers; however, its total harmonic distortion (THD) of 31.08% violates power quality standards. This paper reports distortion reduction by lowering magnitudes of harmonics in the line currents using a delta-wye transformer between the 3-phase utility and the diode bridge rectifier. The leakage inductances of the transformer windings provide a filtering effect on the line current harmonics thus providing THD mitigation of utility line currents. The efficacy of the technique is proved by Power Systems Computer Aided Design (PSCAD) simulations considering the bridge rectifier with and without the delta-wye transformer of vector group Dyl. Experimental results without and with the Dyl transformer feeding the diode bridge rectifier are presented.
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