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Testing and verification of high-level and low-level control, modulation, fault handling and converter co-ordination for modular multilevel converters (MMCs) requires development of experimental prototype converters. In this paper, we provide a a complete overview of the MMC-based experimental prototype at UNSW Sydney (The University of New South Wales) including the structure of the sub-modules,...
Active neutral point clamped (ANPC) converter was developed in order to improve the performances of the neutral point clamped (NPC) converter in terms of the semiconductor loss distribution. Loss distribution depends primarily on modulation type used for generation of the switching signals, therefore it is important to find the appropriate modulation type that will allow the most uniform loss distribution...
A combined quasi-two-stage bridgeless power factor correction (BPFC) converter is analyzed and evaluated in this paper. The combined converter is composed of a three-port BPFC (TP-BPFC) converter and a Buck DC-DC converter. A low voltage and high voltage DC voltage ports are provided by the TP-BPFC converter. A low voltage DC load, whose voltage is lower than the peak AC line voltage, can be directly...
With reliability and flexibility criteria surging, multi-level converters become of growing interest for high-power medium-voltage renewable energy applications. Specific objectives are met with specialized intelligent controls. The goal of this paper is to present a universal intelligent controller able to manage all degrees of freedom of multi-level power converters and any paradigm. To do so, a...
This paper describes a low power and low noise circuit for resistive Wheatstone bridge sensor readout. The proposed readout exploits the bridge configuration of the sensor by embedding it into a second-order continuous-time sigma delta modulator (RC CTΔΣM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational transconductance...
Medium voltage grids are a suitable selection for the connection of high power applications. However, for certain applications, such as PV energy conversion systems or fast charging stations for PEVs, the DC voltages are limited to be below 1000 V, making difficult their connection to such grids without the use of a step-up transformer. Multilevel converters allow the grid connection of such DC loads,...
This paper describes selected issues concerning realization of energy storage system (ESS) designed to operate in power distribution system. This paper presents a modular approach of 300 kVA power converter operating with superconducting magnetic energy storage (SMES), which gives high dynamics together with high power and suitable capability for instantaneous energy storage. Analysis and simulation...
An improved modulation algorithm is proposed for three-phase face-to-face topology. The algorithm could make the face-to-face dc transformer use 1: 1 ac transformer or omit ac transformer in a wide variable ratio range to reducing the volume of the system. The simulation in MATLAB/Simulink validates the proposed algorithm.
PFC converters are widely used in industrial drive systems. The modulation scheme and the topology of the converter have a considerable impact not only on the switching losses, but also on the volume of the passive components, i.e. the EMI filter (CM and DM) and the dC link capacitors. In order to evaluate this impact, different modulation schemes for 2L and 3L topologies are analysed in this paper...
In this manuscript a new interleaved topology based on the three-port boost converter is presented. A new modulation scheme that works for the interleaved and non-interleaved 3-port boost converters is proposed as well. Models for interleaved and non-interleaved converters that describe the behavior in any of the different working modes are developed. These models can be easily averaged in order to...
This paper presents the design and analysis of high performance flat-type linear permanent magnet gears. A salient pole mover structure and a simple scheme of pole shift are proposed. Totally thirteen topologies (including those of the conventional topology and the twelve new topologies) with different mover structures are given. The corresponding prototypes with a gear ratio of −5.5:1 are optimally...
The purpose of this paper is to investigate the flux leakage effects in the transverse-flux magnetic gear (MG), in which two typical flux leakage phenomena are identified and analyzed, namely, end leakage and fringing leakage. By using the JMAG 12.1 software, the three-dimensional finite element analysis (3D-FEA) modeling surrounded by some blocks with setting as different material properties are...
This paper presents both analysis and experimental verification of applying Selective Harmonic Elimination (SHE) technique for cascaded half-bridge multilevel inverters. The inverter units are fed from PV modules throughout step-down dc-to-dc converters to regulate the inverter input voltage. The inverter has to be asymmetric which allows more possibility to connect PV modules to get maximum possible...
In the applications like aerospace, it is very important to drive the motor with high precision and high efficiency. The traditional switching inverter drives output pulse mode voltage which results in lots of harmonics and influences the stability of motor drives. A multilevel-switching-linear hybrid (MSLH) scheme is proposed in the paper for the permanent magnet synchronous motor (PMSM) drives....
This paper studies on characteristics of common- mode voltage (CMV) of a four-leg matrix converter with balanced and unbalanced load. Four groups of switching states are divided and figures of the relationship between CMV peak value and inductance ratio k together with unbalanced factor are presented. The effect of ratio k on CMV amplitude is similar in balanced or unbalanced load. CMV peak value...
This paper focuses on the design and analysis of multi-stage noise-shaping (MASH) sigma-delta modulators. Fundamentals and properties of MASH modulators are discussed. A detailed methodology on analyzing continuous-time MASH (CT-MASH) modulator based on the impulse invariant transformation is also described. Two fabricated design examples are discussed: a 130 nm CMOS CT-MASH 4-0 employing a digital...
This paper presents a seven level inverter utilizing switched-capacitor technique. Proposed topology employs two asymmetric DC voltage sources as input and generates a multilevel staircase output. The structure includes a front-end switched-capacitor based DC-DC converter cascaded by a back-end H-bridge inverter. The frontend SC DC-DC converter feeds three DC voltage levels to the H-bridge inverter...
Two Band-Pass (BP) Discrete Time (DT) ΔΣ modulators are proposed in this paper. In both cases, the drawback of high-speed power-hungry adder is tackled by proposing a modified unity signal transfer function (STF) adder-less feedforward structure. The first proposed BP DT ΔΣ modulator is a conventional adder-less multi-stage noise shaping (MASH) ΔΣ modulator, while the noise leakage problem, caused...
Due to the three-phase-to-three-leg direct matrix converter (3 × 3 MC) cannot be achieved with unbalanced load, then the three-phase-to-four-leg direct matrix converter (3 × 4 MC) is introduced. A novel modulation strategy is proposed to ensure the capability of 3 × 4 MC with arbitrary loads, which is development by using fixed voltage vectors and one zero vector. Considering the harm of common-mode...
Performance of multilevel inverters (MLI) are distinguished because of their low harmonic waveform generation, low filtering requirements on AC side and high voltage application. Among different (MLI) topologies, cascaded multi-level inverters (CMLI) are easier to implement and are much more cost effective. The main drawback of multilevel inverters is requirement of more than one isolated DC source...
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