Power Loss Estimation for PWM and Soft-switching Inverter using RDCLI
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The inspiration for the use of the resonant inverter shoots from an aspiration to minimise the switching losses in the inverter devices. This paper portrays an exhaustive study on losses in the resonant DC link inverter. Equations for accessing the diverse losses in the resonant DC link inverter and a corresponding hard switching inverter are developed. Based on these equations, a design optimization is executed for the DC link inverter to attain the optimum standards of the link components. Finally, an evaluation of the losses in the resonant inverter and the hard switching inverter is presented.Keywords:
Grid-tie inverter
Resonant inverter
Switching power
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A new multilevel PWM inverter using a half-bridge and full-bridge cells is proposed for the use of stand-alone photovoltaic inverters. The configuration of the proposed multilevel PWM inverter is based on a prior 11-level shaped PWM inverter. Among three full-bridge cells employed in the prior inverter, one cell is substituted by a half-bridge cell. Owing to this simple alteration, the proposed inverter has three promising merits. First it increases the number of output voltage levels resulted in high quality output voltages. Second, it reduces two power switching devices by means of employing a half-bridge cell. Third, it reduces power imposed on a transformer connected with the half-bridge unit. That is to say, most power is transferred to loads via cascaded transformers connected with low switching inverters, which are used to synthesize the fundamental output voltage levels whereas the output of a transformer linked to a high switching inverter is used to improve the final output voltage waves; thus, it is desirable in the point of the improvement of the system efficiency. By comparing to the prior 11-level PWM inverter, it assesses the performance of the proposed inverter as a stand-alone photovoltaic inverter. The validity of the proposed inverter is verified by computer-aided simulations and experimental results.
Grid-tie inverter
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The through state is allowed in traditional single-phase Z-source inverter,and the reliability of the system is improved.With the advantages of Z-source inverter,modified PWM strategy is put forward.Switch commutation process and the stress of power devices are analyzed,and the efficiency of the inverter with conduction losses model,switching losses model and inductance losses model are calculated.Compared with the simple Boost control strategy,the efficiency of single-phase Z-source inverter is improved in the modified PWM strategy.Experimental results show the proposed PWM strategy is feasible and correct.
Commutation
Modulation index
Grid-tie inverter
Three-phase
Z-source inverter
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In this paper,a novel inverter based on buck converter is presented,which achieves a sine wave output voltage through DC-DC conversion.The author analyzes the circuit operation principle,studies its control strategy,immunity,load characteristics and dynamical response.The simulative and experimental results show that with the PD control based on feedback of voltage error the output voltage of the inverter can remain dynamically unchanged when there are disturbances in input DC voltage or load current,that the inverter has a good load characteristic.Compared with the traditional inverter,this new one has some advantages such as low switching losses,lower cost.
Sine wave
Buck converter
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This paper presents a characteristic comparison between a five-leg inverter and a nine-switch inverter. The five-leg inverter and the nine-switch inverter is a single inverter that can drive two AC motors independently. Concretely, we show a circuit architecture of both inverters, a modulation method for an independent drives and a division of voltage utility factor. Moreover, investigate about the inverter losses and a switching device capacity in driving two AC motors independently and adapting a control method to decrease the inverter losses.
Grid-tie inverter
Modulation (music)
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<p>This paper presents a circuit configuration of five-level PWM voltage-source inverter developed from the three-level H-bridge inverter using only a single DC input power source. In the proposed five-level inverter, an auxiliary circuits working as the voltage balancing circuits of the inverter’s DC capacitors is presented. The auxiliary circuits work to keep stable DC capacitor voltages of the inverter, and also to reduce the capacitor size of the inverter. The unique point of the proposed balancing circuits is that it needs only a single voltage sensor to control the voltages of the two capacitors in the inverter. Moreover, a minimum number the inverter’s switching devices is also an important feature of the proposed inverter topology. A simple proportional integral controller is applied to control the voltage of the DC capacitors. The proposed topology is tested through computer simulation using PSIM software. Laboratory experimental tests were also conducted to verify the proposed inverter circuits. The computer simulation and experimental test results showed that the proposed balancing circuits works properly keeping stable voltages across the two DC capacitors of the inverter using only a single voltage sensor. The inverter also works well to synthesize a five-level PWM voltage waveform with sinusoidal load current.</p>
Grid-tie inverter
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This paper discusses analysis of common-mode voltage elimination of a PWM inverter with an auxiliary inverter. The main inverter and the small capacity auxiliary inverter are connected at the neutral point of the LC filter. The auxiliary inverter compensates common-mode voltages of the main inverter. Additionally, because the auxiliary inverter does not output active power, the capacity of the inverter is small. Common-mode voltages results from rapid change of output voltage when the switching is done in inverter. The common-mode currents flow through parasitic capacitances. Theoretically, the auxiliary inverter is able to perfectly compensate the common-mode voltage generated by the main inverter. This paper discusses the analysis of the common-mode voltage elimination of the inverter.
Common-mode signal
Grid-tie inverter
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The losses of hard-switching inverter and a ZCT soft-switching inverter are theoretically analyzed.Then.a comparison between the soft-switching inverter and hard-switching inverter on different output power and different switching frequency is given.Finally,a conclusion of this comparison is derived,based on this conclusion a direction of how to improve the efficiency of soft-switching inverter is given.
Switching power
Grid-tie inverter
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Commutation
Chopper
Grid-tie inverter
Rectifier (neural networks)
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To realize a soft-switching inverter with small volume and high efficiency, a synchronous auxiliary resonant commutated pole (SARCP) soft-switching inverter with improved load adaptability is proposed, which only contains two auxiliary inductors. In one switching cycle, all commutation processes can be synchronously assisted by an auxiliary inductor. Soft switching is achievable for all switches of the SARCP inverter. Compared with the auxiliary resonant commutated pole (ARCP) inverter, the SARCP inverter has improved load adaptability, especially in the light load current condition, which is beneficial to reduce the total power loss and the dc-link capacitance. The equivalent circuits of the SARCP inverter are given under different operation modes. The operation principle, soft-switching implementation conditions, parameter optimization design methods, and the characteristics of the SARCP inverter are analyzed. Finally, simulation and experimental results verify the effectiveness of the SARCP inverter.
Commutation
Resonant inverter
Adaptability
Grid-tie inverter
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Bar (unit)
Link (geometry)
Busbar
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