Power Factor Correction Rectifier with a Variable Frequency Voltage Source in Vehicular Application

2018

IET Power Electronics

High harmonics in supply currents of three-phase controlled/uncontrolled converters are creating many problems to the power system and customers at point of common coupling. Third harmonic current injection technique is an excellent option for harmonic reduction of these converters. Minimum total harmonic distortion (THD) for any firing angle of controlled converter is function in phase-angle and amplitude of harmonic injection current that can be controlled by single-phase controlled converter and boost converter, respectively. A novel scheme with three bidirectional switches and single-phase controlled converter to circulate the injection current to supply currents has been introduced. This novel scheme is compared to the stateof-the-art system using zigzag transformer. A novel mathematical analysis showing the optimum values for components on the harmonic injection path at minimum THD and the corresponding efficiency for the proposed scheme and state-of-the-art scheme is introduced. Two lab prototypes for these two schemes have been implemented, discussed, and compared to show the benefits of using the new proposed scheme. The results show the superiority of the new proposed scheme.

“…An approximate formula for obtaining the volt-ampere rating of zigzag transformer in case of unity turns-ratio can be obtained as shown in (28) S zz (p . u . )…”

Section: Design Of Zigzag Transformermentioning

confidence: 99%

“…1 b . Harmonic injection device can be unloaded Y‐Δ transformer [25], two single‐phase transformers [26], ZZ‐HID [21], or three bidirectional switches as HID (BS‐HID) [27, 28]. Y‐Δ and Y‐Y transformers increase the cost of the scheme.…”

Section: Introductionmentioning

confidence: 99%

Harmonic injection scheme for harmonic reduction of three‐phase controlled converters

2018

IET Power Electronics

“…An approximate formula for obtaining the Volt-Ampere rating of zigzag transformer in case of unity turns-ratio can be obtained as shown in (25) S zz (pu) = 3V LL I F /9…”

Section: Design Of Zigzag Transformermentioning

confidence: 99%

“…The circuit shown in this reference [18] uses zigzag transformer as HID and LC filter as HIN in the dc‐link tuned at third harmonic to extract HIC and it will be compared with the new proposed circuit shown in this paper. HID can be un‐loaded Y −Δ transformer [22], two single‐phase transformers [23], zigzag transformer as HID (ZZ‐HID) [18] or three‐ bidirectional switches as HID (BS‐HID) [24, 25]. Y −Δ and Y − Y transformers increase the cost of the scheme.…”

Section: Introductionmentioning

confidence: 99%

Efficient current injection device for harmonic reduction of three‐phase controlled converters

IET Circuits, Devices & Syst

2017

Third harmonic current injection technique is one of the best options for harmonic reduction of three-phase controlled/ uncontrolled converters. Injecting third harmonics current from dc-bus to the line current reduces its harmonic contents. Minimum THD for any firing angle of controlled converter is function in phase-angle and amplitude of harmonic injection current that can be controlled by single-phase controlled and boost converters, respectively. This scheme is used with three bidirectional switches as harmonic injection device to circulate the injection current to supply currents. This scheme is compared with the state-of-the-art system using zigzag transformer. A novel mathematical analysis for the proposed scheme and state-ofthe-art scheme is introduced. The mathematical analysis introduces the optimum values for components on the harmonic injection path at minimum THD and the corresponding efficiency of each scheme. The two schemes under study have been simulated using PSIM program. Two lab prototypes for these two schemes have been implemented. Mathematical, simulation, and experimental results for these two schemes have been introduced, compared, and discussed. The results show the superiority of the proposed scheme.

A novel current injection device for harmonic reduction of three-phase controlled converters in renewable energy utility interfacing

Journal of Renewable and Sustainable Energy

2017

Three-phase controlled/uncontrolled converters have been used in renewable energy applications such as photovoltaic and wind energy as rectifiers and inverters. The main drawback of these converters is the high THD (Total Harmonic Distortion) in their line currents. Many techniques have been used to remedy this problem. Third harmonic current injection is one of the best solutions for the harmonic reduction in line currents of these converters. Injecting third harmonic current from the dc-bus to the line currents reduces its harmonic contents. Minimum THD for any firing angle of the controlled converter is a function of the phase-angle and amplitude of harmonic injection current that can be controlled by a single-phase controlled converter and a boost converter, respectively. This scheme is used with a zigzag transformer to circulate the harmonic injection current to the line currents. A novel mathematical analysis for the proposed scheme and state of the art scheme is introduced. The mathematical analysis introduces the optimum values for components on the harmonic injection path at minimum THD and the corresponding efficiency. The scheme under study has been simulated using the PSIM program. A lab prototype for this scheme has been implemented. Mathematical, simulation, and experimental results for this scheme have been introduced, compared, and discussed. The results show the superiority of the proposed scheme.