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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...
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...
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 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...
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...
PWM current source inverters (CSI's) are usually operated with a fixed pattern and fed from a thyristor rectifier controlled current source. Transient response of the output current is slow and input power factor is low. This paper proposes a symmetrical PWM CSI topology with a two loop control structure. A voltage regulated current source inverter ensures instantaneous output voltage control through...
A new configuration of a soft-switching power converter using phase-to-phase commutation is proposed. The topology of the phase-to-phase commutated inverter (PPCI) is derived from the auxiliary resonant commutated pole inverter. A control strategy is suggested and the principle of the PPCI operations is discussed. PPCI ensures switching at zero voltage across the working power transistors and zero...
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