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The output voltage range of renewable energy generations such as wind and photovoltaic can be influenced by the parameters of environment at a wide range, which can not satisfy the requirements of system for grid-connected operation. Therefore high-gain voltage inverter is important to integrate the renewable energy into the utility. For high-gain voltage and standard load voltage at low input DC...
This paper presents a mixed three-level neutral point clamped (NPC) inverter with hybrid modulation method. It enables traditional Si devices and wide bandgap devices integration to reduce power loss and achieve high power density. Simulation results are firstly provided to verify the validity of the proposed approach.
This paper presents a hybrid multilevel inverter with DC bypass. Mixed modulation method is proposed to balance dc voltage, and enables Si devices & wide bandgap devices integration to reduce power loss and achieve high power density. Simulation results are firstly provided to verify the validity of the proposed approach.
This paper proposes optimal switching period phase-shifted method for slave inverter to reduce grid current ripples in synchronized two parallel three-phase grid-connected voltage-source inverters (VSI). In parallel operation, a 180 degree phase shifted method generally takes of advantage of reducing grid current ripples in same DC-link voltage for each grid-connected VSI. However, in case of unequal...
This paper proposes an improved phase-shifted pulse-width modulation (PS-PWM) method for a three-phase cascaded H-bridge (CBH) multi-level inverter. In the proposed PS-PWM method, the switches at one leg of H-bridge cell (HBC) only operate and the switches at other leg are clamped. Therefore, the number of the multi-carrier signals depending on the voltage level can be reduced in half compared to...
Traditional Z-source inverter can boost or buck voltage for its unique impedance network, but also has its own drawbacks, such as input current is not continuous, boost capacity is limited, the capacitor voltage stress is large and etc. In order to overcome the shortcomings of the traditional Z-source inverter, a series of Z-source inverters are proposed. In this paper, the topology of three kinds...
This paper presents an optimized, 3-φ, multilevel inverter (MLI) topology. The proposed system is derived by cascading the level generation part with the phase sequence generation part. Further, it can be operated at any required level depending upon the configuration of the level generation part. Thus, for higher level operation extra components are required at the level generation part only. Therefore,...
In order to reduce the ripple of DC-link voltage and capacitor current, this paper presents a method to select suitable capacitance for the rectifier (full-wave controlled) and inverter. Meanwhile, a braking unit is developed to prevent the overvoltage of DC bus. The impact of the length of cable, connected between the braking unit and the inverter, is researched from a mathematical point of view...
Single-stage buck-boost gird-connected inverter is widely used in distributed generation systems because of low cost and high efficiency. However, shoot-through problem exists, so reliability of the system is reduced. In addition, output voltage of renewable energy resources varies widely with load and environmental condition, so voltage stress of switches is high in wide input-voltage range application...
In this work, we investigate the dual gate positive feedback field-effect transistor (FBFET) using DC and transient TCAD simulation. I-V characteristics, subthreshold swing, and transient characteristics are analyzed. The FBFET has steep switching property and low off current. We design an inverter that can low power operate with the FBFET. By using the FBFET, the stand-by current is effectively suppressed...
A carrier-based modulation (CBM) method is proposed for indirect matrix converters (IMC) to reduce common-mode voltage (CMV). The proposed method is developed by utilizing two triangle carriers with opposite phase, and the phase with the minimum absolute output voltage uses the different carrier. The range of zero-sequence signals is given, and the selection of zero-sequence signals and the arrangement...
This paper proposes a new virtual space vector modulation (VSVM) scheme that can eliminate the common-mode voltage (CMV) for three-level neutral-point clamped (NPC) inverters with balanced neutral-point voltage. The proposed VSVM scheme is based on the virtual space vector concept, which constructs the virtual vectors from the original medium vectors to achieve zero CMV. Moreover, the neutral-point...
This paper presents the operating principles and modified space vector modulation strategy for a three-phase quasi Z-source neutral point clamped inverter for solar photovoltaic applications. This topology combines the advantages of the neutral point clamped and quasi Z-source inverters. These advantages include single-stage buck-boost power conversion, continuous input current, and low voltage stress...
Topology of the multicell multilevel inverters are one of the most promising power converter topologies being successfully commercialized in the high-power market. This paper proposes a new cascaded multicell multilevel converter with a reduced count of power switches. The proposed reduced-switch-count multilevel is formed by connecting two distinct power conversion stages through two low-frequency...
Model Predictive Control (MPC) method is proposed in this paper applied to a single phase grid-connected inverter. This method uses a state-space equation of the system to predict the next time value of current from the grid side by adjusting the duty ratio of inverter in each sampling period. The duty ratio which minimizes a cost function is selected. Then, taking advantage of the duty ratio to control...
Multilevel inverters has acquire a great attention of modern power electronic systems. It offers less distortion and electro-magnetic interference and hence, it can be used in medium voltage and high power applications. The aim of this research article is to propose a new asymmetric type multilevel inverter with minimum number of power switches. The proposed inverter produces 7-level voltage waveform...
This paper deals with the control design of an asymmetrical cascaded multilevel inverter. This structure therefore provides the capability to produce higher voltages at higher speeds with low switching frequency which has inherent low switching losses and high converter efficiency. Selective harmonic elimination(SHE) for asymmetrical multilevel CHB inverter control is proposed. The technique utilized...
This paper investigates the application of a current source inverter for interfacing a low voltage Photo-Voltaic (PV) source to the grid as a single stage configuration. The paper proposes a novel translated Space Vector PWM (SVPWM) to control the current source inverter to improve the dynamics of the system. The approach relies on the average dc bus voltage to operate the current source inverter...
This work focuses on micro-grid, containing various alternative energy resources (wind and photovoltaic) and super-capacitor energy storage system which performs in stand-alone as well as in grid-connected modes. Various non-isolated converters are used to control the proposed micro-grid. A classical-based supervisory control scheme is designed to perform energy management in order to satisfy the...
this paper presents Model Predictive Control (MPC) to tie three-phase quasi Z-Source Inverter (qZSI) to the utility grid. Regularly, to control the capacitor voltage in qZSI based on MPC, the inductor current is the key factor. Here, the proposed algorithm has the features of decreasing the number of sensors where the inductor current sensor is removed to improve the cost and foot print of the control...
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