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In a three-level flying capacitor inverter, certain switching state sequences can cause an undesirable transient in the pole voltage. The transients constitute and error voltage which degrades harmonic performance, distorts the current and generates electromagnetic noise. This paper presents a scheme to completely eliminate these dead-time transients using a digital state machine to determine the...
This paper presents a vector control system for the control of the capacitor voltages of a 7-level Packed-U-Cell (PUC) three-phase inverter. Usually, PUCs in a three-phase system are controlled as isolated systems. As a result, three voltage loop and three load current loops are required to control the capacitor voltage in each PUC. Additionally, conventional approach requires the tracking of sinusoidal...
Differential mode Three-phase Micro inverter DTMI has many features in low voltage application such as module integrated PV architectures. It has the ability to increase the PV module voltage using single stage with low components count. Differential inverter is implemented using three DC-DC converters with their input terminals connected in parallel and their outputs terminals connected differentially...
A three bit second order delta sigma modulator for audio applications implemented in 130nm CMOS technology is presented. The modulator features two integrators, a flash quantizer and two current steering DACs. In order to minimize the effect of delays in the DACs, excessive loop delay (ELD) compensation is utilized. Using an oversampling ratio (OSR) of 80, the design consumes 2.8mW and achieves a...
Power Electronic Transformer(PET) is a promising component in the future power system. The modular PET is the most attractive due to its high voltage level and flexible function. Unfortunately, when the modular PET is driving multiple loads, there would be overmodulation issue in the AC-DC stage caused by the unbalanced load power. This paper proposed a reactive component injection control strategy...
In this paper, a new operating scheme for five-level hybrid flying-capacitor (5L-HFC) inverters is proposed, of which structure is derived from the conventional five-level active neutral-point-clamped (5L-ANPC) topology by splitting the DC-link into three capacitors in series. In this inverter, the lower number of switching devices is required, thus its cost is reduced considerably compared with the...
Traction converters in automotive applications benefit from various emerging technologies like semiconductor-materials such as SiC or converter topologies like multilevel converters. As especially novel topologies often lack an analytic way to determine their power losses or efficiency, comparability is often hard to achieve until each converter is built up and measured. With the proposed procedure...
Multilevel inverters (MLIs) consist of increased number of power semiconductor devices for the generation of desired output voltage. As the number of components increases, the probability of fault due to power semiconductors increases drastically. Although the MLI topologies are in a matured state, the research in fault detection and diagnosis (FDD) in MLIs is still in a developing stage. This paper...
Neutral Point Clamped (NPC) inverters became popular in many Medium Voltage (MV), high power drives. Conventional two-level inverters do not provide complete solution for the applications deals with high power. The main problem with NPC inverters is DC link capacitors voltage unbalancing i.e. the input DC voltage is not shared equally between the two capacitors. In this paper, Modified Space Vector...
In this paper a new hexagon type (H-Type) sub-block for multilevel inverter (MLI) is introduced suitable for both symmetrical and asymmetrical configurations. The proposed MLI consist cascaded hexagon type sub-blocks to generate more levels in output. The working of topology is presented in detail along with the possible switching states. PDPWM technique is used to generate modulation analysis of...
Spoke-array magnet topology is capable of increasing the torque density of PM machines due to its flux focusing effect. However, a so-called flux barrier effect is found when this magnet topology is applied in flux modulation machines, which may offset the advantage in torque capability. From the view of flux distribution, the flux barrier effect is visually explained in this paper. Through numerical...
This work proposes a DTC-SVM control algorithm based on Stator coordinate transformation to control an induction machine fed by a three level Neutral point clamped matrix converter. The algorithm is simulated on Matlab Simulink to verify its performance. It gives good performance in general. The results are discussed and a study of the effect of the variation of stator resistance is proposed also.
An input-parallel output-series full-bridge DC/AC converter for on-board Electric Vehicle (EV) charger is proposed in this paper with the merits that low input current ripple and output voltage ripple. It can also decrease the current stress on the primary side devices and voltage stress on secondary side devices. This proposed DC/AC converter interleaves two isolated full-bridge converters with parallel...
This paper describes a study and analysis of power loss in Z current source power inverter with elements of Silicon Carbide (SiC), using a PWM technique of modulation at high frequencies of switching (100 KHz). This proposal allows to analyze the behavior of such topologies, the loss of power that are generated using a PWM technique to high frequency and improve the performance and size of these systems...
A fifth and seventh order harmonic elimination scheme for IM drive with a multilevel dodecagonal voltage space vector structure using a single DC source is proposed in this work. Single DC source requirement makes four quadrant operation of the drive system simpler compared to the multilevel do-decagonal structures presented in literatures before. The space vector structure consists of six concentric...
The Modular Multilevel Converter (MMC) has enhanced the feasibility of Multi-Terminal DC grids (MTDC). For controlling the DC bus voltage in the MTDC grids, the droop control is the most promised technique. This paper evaluates the dynamic impact of the way of controlling the MMC on the MTDC grids. Results are compared with a simplified model that highlights the key elements for the dynamic behavior...
This paper analyzes a three-phase Dual Active Bridge (DAB) dc-dc converter with three-level phase-legs, showing a significant increase in the soft-switching region compared to two-level operation. A strategy is presented that results in a Zero Voltage Switching (ZVS) modulation scheme that relies on analytical equations, uses a small amount of switching modes, and obtains close-to-minimal rms currents.
This paper investigates the combined use of basic cell types (half and full bridges) in a Modular Multilevel Converter in order to achieve an improved MMC performance. Based on an MMC without any additional features (only considering the power transmission capability), an optimal design is presented for additional capabilities such as DC fault ride-through capability or safe operation during reduced...
Efficient HV DC-DC converters are one key component of a future HVDC backbone grid. In this paper three promising MMC based HV DC-DC converter topologies, namely the front-to-front converter, the HVDC auto transformer and the modular multilevel DC converter are compared in terms of functionality, conversion efficiency and topology effort.
This paper presents an analytical investigation of the three-phase single active bridge DC-DC converter. First, multiple operation modes have been identified, that can be distinguished by the shape of the phase currents. For every single operating mode, analytical equations have been derived in order to describe the currents of both input and output bridge. In this paper, two operating modes are selected...
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