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To reduce the conduction loss, a novel three-phase current source rectifier, named Delta-type Current Source Rectifier (DCSR), has been proposed in previous research. This rectifier has delta-type connection on its input side, and its dc-link current can be shared by multiple devices at a time to reduce up to 20% conduction loss. A high-efficiency modulation scheme for DCSR has been proposed, where...
The conduction loss of semiconductor devices is large in traditional three-phase current source rectifiers (CSR). In this paper, a new CSR topology is proposed to reduce the conduction loss. This rectifier, named Delta-type Current Source Rectifier (DCSR), has delta-type connection on its input side and its dc-link current can be shared by multiple devices at a time. Its principle of operation, modulation...
This paper has proposed a new four-level converter structure for low-voltage applications. The converter has low output harmonics and neutral-point-voltage-balancing capability. The switching states of the converter have been analyzed and the current flow path has been identified. A modulation and control algorithm has been devised to control the neutral points' voltage and flying capacitor voltage,...
Using one DC source for the dual inverter open-end winding topology can lead to common-mode current circulating through the DC bus connections and, to prevent motor failure, arising of EMI issue and increasing losses in the system this should be avoided. Such common-mode current flow results if there is a common-mode voltage (CMV). Therefore, in this paper, a switching scheme for the dual inverter...
We propose a novel algorithm mitigating cross-polarization modulation based on a joint blind channel estimation and symbol detection. Using Nyquist pulse shaping and PDM-QPSK modulation, experiments are in accordance with simulations and show up to 0.7dB improvement in Q-factor.
This paper presents a current-source converter (CSC) that uses a switched-inductor dc link circuit to improve its performance characteristics, providing opportunities to lower the conduction losses in the rectifier stage and dc link, as well as an additional degree of freedom for regulating the output current waveforms. The proposed topology replaces a single link inductor in the self-commutated CSC...
This paper introduces the use of machine saliency as one of the parameters for the sizing of a three level inverter dc-link capacitor. A new nearest three vector (NTV) balancing algorithm is also introduced for the dc-link capacitors. A comparison between a two and three level inverter was conducted whereby the inverter input dc current for the two level inverter registered higher ripples than that...
Although the K-best algorithm is well-known as an efficient suboptimal version of the maximum likelihood detection (MLD), its complexity is still significantly affected by the constellation size W. Especially, its sorting task is known as the major bottleneck. In this paper we propose a two dimensional (2D) sorter-based K-best algorithm, whose complexity is negligibly affected by W. Instead of considering...
This paper presents a designing and an analysis of a space vector modulation (SVM) algorithm in a fault-tolerant induction motor drive system based on a redundant voltage inverter topology. First, an influence of open-switch failures on inverter voltages modulation is considered. Furthermore, limitations of the post-fault SVM method are specified. To validate the analyzed algorithm, a simulation model...
Asymmetry in average channel conditions is a challenging factor in two-way relay communication (TWRC) system in order to obtain a balanced performance at two end nodes. In this paper, for a coded TWRC system, we consider hierarchical modulation and network coding assisted bit interleaved coded modulation (HMNC-BICM) based system. The performance of the considered HMNC-BICM based system is compared...
In this paper Instantaneous Reactive Power (IRP) theory is applied to develop an improved modulation method for Matrix Converters (MCs) operating with unbalanced loads. IRP theory shows that, for unbalanced loading conditions, the instantaneous power contains a constant component and a component that fluctuates at twice the fundamental frequency. In conventional modulation schemes the power fluctuation...
To reduce the conduction loss, a novel three-phase current source rectifier, named Delta-type Current Source Rectifier (DCSR), has been proposed in previous paper. This rectifier has delta-type connection on its input side, and its dc-link current can be shared by multiple devices at a time to reduce up to 20% conduction loss. The SiC devices are expected to be the next-generation power devices due...
A system is described whereby floating capacitor H-bridge converters are located in each phase between the utility grid and a squirrel cage induction motor. Injecting a series voltage in each phase, the power electronics can be used to control the motor voltage during starting and hence limit the motor starting current to the desired level. The motor voltage can also be used under steady-state operation...
A new space vector modulation (SVM) strategy is proposed for quasi-Z-source indirect matrix converter (QZS-IMC) to reduce common-mode voltage and to ensure a high voltage transfer ratio. QZS-IMC's common-mode voltage is analyzed, and the subdivided sectors are employed to rearrange switching sequence in the inverter stage, which can reduce common-mode voltage and power loss. The proposed modulation...
The reaction of detection and classification of signals in low Signal-to-Noise Ratio (SNR) regimes poses significant challenges in the physical layer design of cognitive radio networks. This paper considers a cognitive radio consisting of one Primary User (PU) and K Secondary Users (SUs), where the main objective for an arbitrary SU is to recognize the PU's signal from other secondary users' signals,...
In Multilevel Polarization Modulation (MPM), the abrupt switching among the discrete Sates of Polarization (SOPs) brings discontinuity of signal waveforms, which will broaden bandwidth and decrease the bandwidth efficiency consequently. To alleviate the problem, in this paper a Multilevel Continuous Polarization Modulation (MCPM) scheme is proposed with continuous SOP to produce continuous signal...
This paper describes a embedded controller for the matrix converter. Thanks to its computing throughput it is suitable for university use, but it enables operation in the whole industrial rage thank to its construction. Besides the example usage in matrix converter, the control system is generally usable for various control tasks.
This paper has researched the vector modulation strategy of three-phase to single-phase matrix converter (3–1 MC) with an active power decoupling capacitor, and focused on asymmetric two-phase current vector modulation of 3–1 MC's virtual inverter. Each work state of 3–1 MC during a switching period is obtained based on the analysis of 3–1 MC's voltage sectors, current sectors and the input current...
This paper studies the impact of imperfect channel state information (CSI) due to limited feedback link on the performance of multi-user MIMO system using filter bank based multicarrier (FBMC) modulation. The system is composed of a transmitter performing Zero Forcing (ZF) precoding and single antenna receivers applying decoding techniques. Simulation-based results show that except when the number...
In this paper, we propose a new detection technique for multiuser multiple-input multiple-output (MU-MIMO) systems. The proposed scheme combines a lattice reduction (LR) transformation, which makes the channel matrix nearly orthogonal, and then employs a multi-branch (MB) technique with successive interference cancellation (SIC). A single LR transformation is required for the receive filters of all...
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