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A new asymmetrical hybrid multilevel inverter topology is presented. The new topology improve the number of the output voltage level greatly through cascading two five-level H-bridge cells. A hybrid PWM strategy is proposed for the new topology that the switches of different cells works in different switching frequency to low switching losses. Lastly, an experimental 17-level asymmetrical inverter...
This assay supposed one kind of asymmetrical multi-level inverter that based on the topology of cells cascading, every cell in this inverter is composed of one two-levels inverter series with several three-levels H bridges, the controlling system is constructed by DSP and FPGA. This article described the topology of this inverter and its controlling methods in detail. In final, tested this inverter's...
There is a strong trend in the photovoltaic (PV) inverter technology to use transformerless topologies in order to acquire higher efficiencies. This paper presents a single-phase five-level grid connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the rectified inverted sine carrier signal...
The power chain of a cable car has to meet special requirements concerning grid coupling and drive concept: On the grid side very low short-circuit power is available and on the drive side the bearable torque ripple is very low. Due to the long cable connections, the use of very line friendly line-side converter topologies and control concepts is a must. The minimization of the torque ripple is the...
Power converter is the key element of the photovoltaic generation system. In order to improve the energy conversion efficiency and achieve an economic solution, hybrid cascade inverter (HCI) is employed and implemented to realize DC-AC conversion in this paper. HCI has a similar topology with conventional H-bridge cascade inverter, while the voltages of its DC buses are in a geometric sequence. In...
In this paper, a new scheme for three-level voltage space vector generation is proposed. In this work, the three-level inverter topology is realized by feeding an open winding induction motor with two two-level inverters, fed from a single dc source having the magnitude half compared to the NPC three-level inverter. Compared to existing three-level inverter topologies for open-end winding induction...
This paper describes a new configuration of the single-phase seven-level voltage source inverter. The proposed inverter based on modified H-bridge converter. The inverter is built of conventional H-bridge inverter and two bidirectional switches and three bulk capacitor banks. To validate the proposed inverter, a low power prototype inverter has been designed and implemented; analytical, simulation...
This paper proposes a new extended boost quasi Z-source inverter (ZSI) and a simple modulation and control method based on one-cycle control for controlling a grid connected PEM fuel cell energy system. ZSIs are gaining popularity. Similarly one-cycle controllers are becoming popular due to their simplicity, ease of implementation and fast response. However, this control method has not been developed...
This paper deals with topologies of circuits and strategies of modulation for multilevel inverters. There is a close relationship between these two factors. A new Hybrid multilevel inverter based on the features of the NPC inverter and the Cascade inverter is recommended. Its three modulation strategies and voltages spectrum characteristics are analyzed. The spectrum expressions of the continuous...
The new problems when applying a conventional resistor-capacitor-diode (RCD) clamp snubber to the high power combined three-phase inverter system are investigated. In high power application, the existence of parasitic induction in dc bus makes an additional energy loss on the RCD clamp snubber. The particular topology of combined three-phase inverter makes this situation worse. In this paper, a combined...
In this paper, in order to simplify the control of indirect matrix converter (IMC) and ensure the reliability of it, the theory of finite state machine (FSM) is employed. Essentially, power electronics system consists of limited amount of states, so FSM can be introduced to the design of power electronics control system. The topology of IMC is made up of two stages: rectifier stage and inverter stage...
The matrix rectifier described in this paper can realizes three-phase AC voltages to a DC output voltage and can work as a power factor correction converter. The paper presents an SPWM control strategy based on virtual DC link for AC/DC matrix rectifier with high frequency link. The matrix converter in the paper can be equivalent to a virtual rectifier and a virtual inverter. The proposed control...
In this paper, a novel five-phase five-level inverter based on H-bridge is proposed. Then, the PWM control strategies of this inverter are researched. As the five-phase five-level inverter has 3125 space voltage vectors, it makes SVPWM algorithm extraordinarily complex and too difficult to implement. So, it is a feasible control scheme to adopt carrier-based PWM method. According to phase-shift SPWM...
Because of the shortage of the IGCTpsilas series connection to obtain 6 kV output, the medium voltage drive (MVD) based on the H bridge neutral point clamped three-level inverter is introduced. Consequently, the arising of the common mode voltage (CMV) is discussed, the equivalent CMV circuit is deduced, and the common-mode circle currents are proposed in this paper. With the analysis of the relationship...
This paper mainly discusses several methods on widening the speed-regulating range of rare earth permanent magnet brushless direct current motor (BLDCM). The simulation of traditional three-phase inverter structure and the three-phase bridge based on Buck chopper is analysis on the speed-regulating range. The calculation formulas of inductance and capacitance in Buck chopper are given. DSP is designed...
A novel topological structure of Active Power Filter (APF) in alpha-beta coordinate is presented based on transformation of three phase static A-B-C coordinate to two phase static alpha-beta coordinate. The topological structure adopts two groups of single-phase inverter as main devices of APF, and can realize transformation of current source from two phases to three phases by using a special transformer...
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