Conference Paper

Novel modulation schemes minimizing the switching losses of sparse matrix converters

Power Electron. Syst. Laboratory, ETH Zurich, Switzerland
DOI: 10.1109/IECON.2003.1280564 Conference: Industrial Electronics Society, 2003. IECON '03. The 29th Annual Conference of the IEEE, Volume: 3
Source: IEEE Xplore


The switching losses of a three-phase sparse matrix converter (SMC) operating in the lower modulation range are minimized by employing the lowest and the second largest input line-to-line voltage for the formation of the converter DC link voltage. The resulting current stresses on the power semiconductors and the switching frequency ripple RMS values of the filter capacitor voltages and output currents are calculated by digital simulation and compared to conventional modulation. Finally, a modulation scheme is introduced which allows the generation of reactive input power also for missing active power transfer via the DC link and/or purely reactive load. This is a basic requirement for operating the SMC in boost mode where the output filter capacitor voltages have to be controlled sinusoidally also for no-load operation.

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    • "" To avoid adding passive components, an alternative recommendation is discussed here for boosting voltage. Like most power converters, power flowing through a 3 × 3 matrix converter or IMC can be reversed, as mentioned in [25], whose focus is more on developing an appropriate modulation scheme. For an IMC, if forward flowing is not required, its topology can further be simplified with lesser switches used. "
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    ABSTRACT: Indirect matrix converter (IMC) is an alternative for ac/ac energy conversion, usually operated with a voltage stepped-down gain of only 0.866. For applications like distribution generation where voltage-boost functionality is required, the traditional style of operating the IMC is therefore not appropriate. Like most power converters, the operation of the IMC can surely be reversed to produce a boosted gain, but so far its relevant control principles have not been discussed. These challenges are now addressed in this paper with distributed generation suggested as a potential application. Simulation and experimental results for validating various performance aspects of the proposed control schemes can be found in a later section of this paper.
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    • "In certain applications (e.g., motor drives operating at low speed) where a low output voltage is required, the input stage can be modulated such that a lower average dc-link voltage is generated as shown in Fig. 12(b). In this case, the dc-link voltage is derived from the second highest and lowest positive line-to-line voltages, or and for [28]. Three-level output voltages [Fig. "
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    ABSTRACT: A novel three-phase ac-ac sparse matrix converter having no energy storage elements and employing only 15 IGBTs, as opposed to 18 IGBTs of a functionally equivalent conventional ac-ac matrix converter, is proposed. It is shown that the realization effort could be further reduced to only nine IGBTs in an ultra sparse matrix converter (USMC) in the case where only unidirectional power flow is required and the fundamental phase displacement at the input and at the output is limited to plusmnpi/6. The dependency of the voltage and current transfer ratios of the sparse matrix converters on the operating parameters is analyzed and a space vector modulation scheme is described in combination with a zero current commutation method. Finally, the sparse matrix concept is verified by simulation and experimentally using a 6.8-kW/400-V very sparse matrix converter, which is implemented with 12 IGBT switches, and USMC prototypes.
    Full-text · Article · Oct 2007 · IEEE Transactions on Power Electronics
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    • "Irrespective of the modulation methods used, robust commutation is critical, as has been extensively investigated and examined [24] [25] [26] [27] [28] [29] [30]. As an alternative to the standard 9-switch topology, the rectifier-inverter-without-dclink structure and its variations have been carefully examined [16] [31] [32] [33] [34] [35] [36] [37], leading to a simple and robust commutation on the basis of its topological properties [34]. A space vector modulation scheme for the indirect matrix converter (IMC) was developed with focus on the desired output voltage in [34]. "
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    ABSTRACT: In this paper, the indirect matrix converter is systematically studied with the single-pole-multiple-pole representation. A carrier based PWM algorithm is developed in two steps. First, the continuous modulation functions for all the throws are derived based on the desired sinusoidal input currents. Then the switching functions are derived from the modulation functions with focus on the zero current commutation. The proposed PWM algorithm is verified by numerical simulation and hardware experimentation on a laboratory prototype matrix converter
    Preview · Conference Paper · Jul 2006
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