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This paper presents guidelines for passive components design of single-stage buck-boost inverter with unfolding circuit. This inverter has low number of passive components and it is intended for application where a wide input regulation range is required. All theoretical statements are confirmed by simulation results.
This paper presents a thorough study on Five-Level Packed U-Cell inverter called PUC5. The main advantage of PUC5 topology over other popular multilevel ones is the redundant switching states, which facilitate the voltage balancing of the flying capacitor in its configuration. Switching states of the PUC5 inverter are analyzed to ensure an easy voltage balancing process. That voltage controlled auxiliary...
Series connected IGBTs provide a useful method to improve the voltage level, and which is a very important approach to achieve high-voltage power converters. However the imbalance of collector-emitter voltages across IGBTs is a key issue that must be addressed. This paper proposed a novel type of series connected IGBT circuit with voltage self-balance by using clamping diode and snubber capacitor,...
Common mode voltage (CMV) and switching frequency of an inverter fed induction motor drive are dependent quantities. Increase in common mode voltage (CMV) with increase in switching frequency for induction motor drive is studied in this paper. Conventional sinusoidal pulse width modulation technique is used to drive an inverter fed induction motor. It is demonstrated that the peak value of CMV increases...
This paper proposes a current-source parallel resonant Class E inverter with low peak switch current. The proposed circuit consists of two switches, a parallel resonant circuit, a capacitor, an inductor, a choke inductor, and a DC voltage source. The peak current flowing through the switches is no more than the input current, which reduces the current stress of the switching devices. Zero-voltage...
The photovoltaic (PV) source simulators are widely used to test solar inverters, evaluate their control algorithms and study their grid integration issues in the laboratory settings. Many commercial programmable dc power supplies can be re-programed to be PV simulators. Due to the bulky output dc capacitors, the dynamic response and the bandwidth of these PV simulators are significantly limited, which,...
Multilevel Inverters play key role in grid integration of photovoltaic (PV) systems. Although power semiconductor devices in multilevel inverters represent the most expensive and vulnerable parts according to the recent reliability surveys. Thermal stresses in power semiconductor devices represent the main cause of their failures. Therefore, improved controllers with lower thermal stresses are highly...
This paper presents a closed loop control design for the class-E2 WPT system with the pre- and post-regulation. In the proposed WPT system, the output voltage is regulated by changing the switch-on duty ratio of the post regulator, whose information is transmitted to the primary side by wireless communication. At the transmitter side, the input current is minimized by changing the switch-on duty ratio...
Aiming at the power loss caused by photovoltaic (PV) mismatch problem, a distributed maximum power point tracking (DMPPT) Flyback type PV grid-connected inverter and the sinusoidal pulse width modulation(SPWM) unified control strategy with DMPPT are proposed. Meanwhile, the circuit topology, operation modes and steady state relations are deeply investigated. The inverter is composed of n Buck choppers...
This paper discusses the operation of a new battery-integrated high-frequency-isolated PV inverter. The working principle of the circuit is similar to the triple-active-bridge converter, wherein power-flow at two of the three ports can be regulated by variation of phase-shifts between the three synthesized high-frequency ac voltages. ZVS operation of most devices and an electrolytic capacitor-free...
Multi-level topologies reduce the requirements on inductors and filters, however, given the high number of series connected semiconductors, it is still unclear if they are a suitable option to achieve ultra-high efficiency while maintaining a reasonable power density. For this purpose, an extensive quantitative evaluation of different topologies is carried out, to determine the required volume for...
This paper presents a family of cost-effective magnetically-coupled impedance source inverters for renewable energy systems. The inverters are derived from magnetically-coupled impedance source networks, featuring low cost and no ground leakage current when used in PV system. The numbers of required semi-conductor switches is reduced. More important, the elimination of leakage currents makes it particularly...
In this paper, a new 11-level topology of symmetrical Multilevel Inverters (MLIs) is proposed. The proposed topology offers reduced number of components as compared with conventional and recently published topologies. The Selective Harmonic Elimination (SHE) is adapted for switching modulation that removes undesired harmonics. A comparative analysis of proposed topology with other proposed topologies...
A control strategy based on finite-state model predictive control (FS-MPC) for uniform switching transitions distribution and reduced calculation requirements is presented in this paper. FS-MPC evaluates all the available switching states of the controlled topology to find the combination that meets the control objectives. However, the number of switches, along with the computation burden, is significantly...
Model predictive control (MPC) has recently emerged as a powerful control method for ac motor drives, featuring quick dynamic response and intuitive concept. However, conventional MPC requires lots of calculation resources due to the enumeration of each possible voltage vector, especially in the case of a multilevel converter. To achieve good performance with low switching frequency for high power...
Induction industrial welding is one of the most straightforward application for the power inverter. Practical industrial welders require at the same time power levels up to 1 MW while frequencies are in the range between 200–500 kHz, depending on the characteristics of the tube to be weld. SiC devices, as per its superior high frequency characteristics, are ideal components for this type of high power,...
This paper presents the application of a multiple switching pattern selective harmonic elimination on three level inverter. The aim of this work is to eliminate low rank harmonics (3rd, 5th, 7th and 9th) from an AC voltage waveform generated by DC to AC converter and also control the fundamental component, the modulation algorithm is based on the Newton-Raphson method which is one of the simplest...
This paper presents Direct Power Control (DPC) based on instantaneous power theory is presented. The simulation of a grid connected five level inverter via an inductive filter with a new direct power strategy is used. However, this control method is similar to the classic DPC method, in which used triangles instead of the sectors. Furthermore, the regulation of DC link without interfering the hysteresis...
This work presents the operation of a PCB-embedded diode-clamped multilevel-converter integrated circuit (IC) fabricated in a lateral, high-voltage AlGaN/GaN-on-Si heterojunction technology. It is demonstrated, that PCB-embedding is an appropriate assembly technique for lateral power ICs with high-integration levels. By placing DC-link capacitors onto the IC-package, parasitc inductances in the power...
Pulse width modulation (PWM) converter based variable-frequency drives to control AC machines have been widely used in motor drive system. However, it also leads to early bearing degradation in inverter driven machine due to the transient shaft voltage and high frequency bearing currents resulted from the PWM switching. To reduce the machine bearing current and extend the bearing lifetime, one possible...
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