A Novel Neutral-Point-Clamped Half-Bridge Eleven-level Inverter With High DC Voltage Utilization Ratio and Fewer Switches

2020 ◽  
Author(s):  
Qicai Ren ◽  
Alian Chen ◽  
Jie Chen ◽  
Chenghui Zhang
Keyword(s):  
Neutral Point ◽  
Dc Voltage ◽  
Utilization Ratio

Research on Minimum Switching Losses of Three-Level PWM Rectifier

2011 ◽  
Vol 354-355 ◽  
pp. 1367-1371
Author(s):  
Wen Jun Wu ◽  
Xiao Ning Han ◽  
Yan Ru Zhong
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Neutral Point ◽  
Pwm Rectifier ◽  
Dc Voltage ◽  
Switching Losses ◽  
Reference Signals

In this paper, the pulse width modulation based on double reference signals is proposed for diode neutral point clamped tri-lever rectifier. In this method, the angle of non-switching region is chosen to make switching losses minimum, and DC voltage utilization is improved. The simulating results show that proposed strategies are correct.

Three phase z-source neutral point clamped inverter with multicarrier PWM technique

2016 ◽  
Vol 35 (5) ◽  
pp. 1575-1591 ◽  
Author(s):  
F.X. Edwin Deepak ◽  
V. Rajasekaran
Keyword(s):  
Electromagnetic Interference ◽  
Electronic Device ◽  
Neutral Point ◽  
Voltage Source ◽  
Electrical Power System ◽  
Content Type ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Three Phase

Purpose The purpose of this paper is to present the three phase seven-level Z-source neutral point clamped (NPC) inverter with multicarrier pulse-width modulation (PWM) technique. Despite numerous topologies and modulation methods, there is a dire need of developing PWM techniques that can be deployed in multilevel inverters. These inverters decrease the total harmonic distortion and it has a good performance for various electrical power system applications. The proposed inverter is investigated for its performance by executing it in shoot through and non-shoot through modes. Design/methodology/approach The purpose is validated through MATLAB/Simulink software platform for implementing the proposed seven-level Z-source NPC inverter outlined with multicarrier based phase disposition technique. The experimental results are verified using SPARTAN 3E FPGA controller with the same control strategy. Findings The efficiency of the proposed inverter is confirmed in terms of increased and faster conversion in the shoot-through mode. By using PDPWM technique the maximum boost gain is achieved with lower modulation index. High control of DC voltage is obtained with only one DC voltage source and one Z network. Originality/value Three phase multilevel inverters are widely used in improving the output voltage quality and reducing the encountered electromagnetic interference in electronic device or circuitry. They are employed in medium and high –power applications to attain increased power ratings while decreasing the switching losses. The performance results shown in this paper will satisfy the above needs of usage in certain applications and less switching losses.

scholarly journals Supply System for Three-Level Inverters Using Multi-Pulse Rectifiers with Coupled Reactors

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3385 ◽  
Author(s):  
Iwaszkiewicz ◽  
Mysiak
Keyword(s):  
Experimental Tests ◽  
Supply System ◽  
Neutral Point ◽  
Reactor Unit ◽  
Distortion Factor ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Line Current ◽  
Coupled Reactors

The paper presents a proposal of the multi-pulse AC/DC converter for providing supply for multilevel inverters and considerably reducing the line current distortion factor. It can be applied as a suitable source of DC voltage and is convenient to supply such inverters that need three or more voltage terminals to supply all sections of the inverter. The converter in question works as a multi-pulse rectifier supplying a three-level NPC (Neutral Point Clamped) inverter. The load introduced by the inverter is simulated as an impedance depended on a selected inverter state. All possible states are determined by using a set of three digits: 0, 1, 2. The sourcing converter is constructed from diode bridge rectifiers connected in parallel as well as the system of magnetically coupled reactors. The reactors are used to shift subsequent line voltages so that they create a multiphase voltage system supplying component rectifiers. The article presents two alternative rectifiers: A 12-pulse diode rectifier using one magnetically coupled reactor unit 3CRλ, and a 24-pulse one using three 3CRλ units. Simulation and experimental tests have been executed and selected results included. Conclusion and discussion are added.

scholarly journals Backstepping Predictive Control of Hybrid Microgrids Interconnected by Neutral Point Clamped Converters

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1210
Author(s):  
J. Dionísio Barros ◽  
Luis Rocha ◽  
J. Fernando Silva
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Harmonic Distortion ◽  
Voltage Control ◽  
Neutral Point ◽  
Control Mode ◽  
Dc Microgrid ◽  
Dc Voltage ◽  
Ac Power ◽  
Ac Microgrid

In this work, DC and AC parts of hybrid microgrids are interconnected by a neutral point clamped—NPC converter controlled using a new backstepping predictive (BP) method. The NPC converter is controlled to operate in the DC microgrid voltage control mode or in the AC microgrid power control mode. The novel backstepping predictive controller is designed using the dq state space dynamic model of the NPC converter connected to the hybrid microgrid. The designed BP controller regulates the DC voltage or AC injected power, balances the capacitor voltages, controls the AC currents, and enforces the near unity power factor. Simulation (MATLAB/Simulink) and experimental (laboratory prototype) results show that the converter can regulate the DC voltage in the DC microgrid interconnection point, by adjusting the AC power conversion to compensate variations on the loads or on the distributed renewable energy sources in the DC microgrid. AC currents are sinusoidal with low harmonic distortion. The obtained BP controller is faster at balancing capacitor voltages than PWM (pulse width modulation) control with carrier offset. The fast AC power response allows the converter to be used as a primary frequency regulator of the AC microgrid. This research is appropriate for power and voltage control in hybrid microgrids with renewable energy.

A Novel PWM Technology Based on High-Power Current Source Inverter

2014 ◽  
Vol 960-961 ◽  
pp. 910-915
Author(s):  
Jing Bai ◽  
Shi Qi Lu ◽  
Jian Liu
Keyword(s):  
High Power ◽  
Current Source ◽  
Theoretical Derivation ◽  
Dc Voltage ◽  
Current Source Inverter ◽  
Novel Technology ◽  
High Utilization ◽  
Utilization Ratio ◽  
Simulation Results

This paper presents a new csi-hvusspwm technology with many advantages such as the better output waveforms and the high utilization ratio of dc voltage based on the study of the csi-spwm technology and csi-tpwm technology. Theoretical derivation and modulation principle of csi-hvusspwm technology are described in detail. Finally, the simulation results validate the feasibility and effectiveness of this novel technology.

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