Three-phase H-bridge Inverter Research Articles

A Single Stage Photovoltaic Solar Pumping System based on the Three Phase Multilevel Inverter

This paper presents a study of a single-stage DC-AC converter for a solar water pumping application. The topology was based on solar panels connected to a new structure of a three-phase multilevel inverter through DC-bus capacitors. The inverter offers simplicity, requires fewer components compared to conventional ones, and provides optimal voltage and current waveforms with reduced harmonics, eliminating the need for filters. The applied control technique aimed to stabilize the input DC-bus voltage, extract the maximum power using a simple MPPT algorithm, and enhance the efficiency of the water pump through scalar V/f control, regardless of weather changes. A simulation was conducted using the PSIM software, considering a variable daily climate scenario. The results obtained demonstrate the efficiency of the system in extracting energy with optimal torque and current for the pump compared to a classic design based on a three-phase H-bridge inverter.

A Method Based on NGO-HKELM for the Autonomous Diagnosis of Semiconductor Power Switch Open-Circuit Faults in Three-Phase Grid-Connected Photovoltaic Inverters

With accelerating grid decarbonization and technological breakthroughs, grid-connected photovoltaic (PV) systems are continuously connected to distribution networks at all voltage levels. As the grid interaction interfaces between PV panels and the distribution network, PV inverters must operate flawlessly to avoid energy and financial losses. As the failure of semiconductor switches is the leading cause of abnormal operation of PV inverters and typically cannot be detected by internal protection circuits, this paper aims to develop a method for the autonomous diagnosis of semiconductor power switch open-circuit faults in three-phase grid-connected PV inverters. In this study, a ReliefF-mRMR-based multi-domain feature selection method is designed to ensure the completeness of the fault characteristics. An NGO-HKELM-based classification method is proposed to guarantee the desired balance between generalization and exploration capability. The proposed method overcomes the common problems of poor training efficiency and imbalances between generalization and exploration capabilities. The performance of the proposed method is verified with the detection of switch OC faults in a three-phase H-bridge inverter and neutral-point-clamped inverter, with diagnostic accuracy of 100% and 99.46% respectively.

Investigation of voltage regulation in grid–connected PV system

<p>In the present scenario the power demand on the load side is increasing day by day, so to balance the power demand and power supply various renewable energy comes to picture as the additional source of electricity generation. The power generated by various renewable resources such as solar, wind, tidal energy and geothermal sources is environmentally clean and have a less emission impact. Out of which PV system draws more attention because it generates energy with a much lower level of carbon dioxide emissions. In the proposed work the objective is to investigate the synchronisation of the grid-connected PV system in terms of voltage and frequency. It includes the P-V characteristics under the circumstances of MPPT technique such as perturb & observe (P&O) method can able to track the local maximum point. The proposed inverter is a voltage source H-Bridge inverter which is controlled using a Clarke and Park transformation to drive a controlled current into the grid to maintain the THD value within the standards. As the grid frequency is fluctuating between SRF-PLL is generally used to fix the output frequency and phase of the grid. It also includes with the design of a three-phase H-bridge inverter as an interface between PV system and grid system. The proposed work is designed and simulated in MATLAB SIMULINK 2017b environment.</p>

Drive System With Asymmetrical Power Electronics Devices for Novel Reluctance Machines With DC-Biased Sinusoidal Current

This paper proposes a drive system with asymmetrical power electronics devices for the novel reluctance machines with dc- biased sinusoidal current, which is called as dc- RMs in this paper. The three-phase sinusoidal current with same dc offset is injected into the stator winding in the dc- VMs. Therefore, the power device selection method of the conventional motor drive is no longer suitable for dc- RMs. Because of the dc- biased sinusoidal current, two-quadrant switches with asymmetrical current capacity are proposed for the dc- RMs drive. With the asymmetrical switches, the asymmetrical three-phase H-bridge inverter is further brought out. This paper, detailed, analyzes the influence of modulation strategy on current stress of each device and derive the specific current capacity of asymmetric switches. The effects of harmonic current on the current stress, caused by the harmonic back electromotive force in dc- RMs, are also analyzed. Simulation and experimental verification show that the drive with asymmetrical power electronics devices can ensure the performance of the motor while reducing the cost, increasing the power density, and balancing the temperature of the power devices. The theoretical calculation of the current stress is also proved to be precise. In addition, the two-quadrant switches with asymmetric capacity proposed in this paper can also be applied to other dc- RMs drive structure to improve performance.

A Switched-Capacitor-Voltage-Doubler Based Boost Inverter for Common-Mode Voltage Reduction

In this paper, a modified three-phase two-level voltage source inverter is proposed. By combining the conventional three-phase H-bridge inverter with a switched-capacitor-voltage-doubler network, the DC-link voltage of the proposed inverter is double with respect to the input DC voltage. As a result, the output voltage of the proposed inverter can be higher than the input DC voltage. Furthermore, a common-mode voltage (CMV) of the proposed inverter can be reduced through controlling the two additional switches based on the space vector pulse-width modulation. Compared to the existing modulations and topologies, the variation in CMV can only be up to 16.6% of DC-link voltage. Furthermore, the voltage stress across additional switches and diodes is equal to half of DC-link voltage. Mathematical analysis, operating principles, and comparison of the proposed three-phase two-level voltage source inverter with the conventional three-phase voltage source inverters are presented. The simulation results based on PLECS software verify a good performance of the proposed inverter. Finally, a laboratory prototype based on a TMS320F280049 DSP is developed and experimental tests are carried out to validate the effectiveness of the proposed three-phase inverter topology.

Regenerative Braking Mode Operation of a Three-Phase H-Bridge Inverter Fed PMBLDC Motor Generator Drive in an Electric Bike

In this article, the industrial application of three-phase H-bridge inverter fed PMBLDC drive system with its regenerative braking and motoring modes of operation produce electric energy harvestation and its effective utilization in an electric bike is discussed. The H-bridge inverter topology having two legs with four gate drive switches, reduce current ripples and improves the current rating of a drive system. Therefore, the three-phase H-bridge inverter connected PMBLDC drive can be preferred for high torque applications with reduced torque ripples during the commutation of switches. The PMBLDC drive is a permanent magnet machine; so it is proposed in both motoring and regenerative braking modes of operation. In motoring mode, drive consumes electrical energy from battery source for converting the electrical energy into suitable mechanical energy for riding the electric bike. But in a regenerative braking mode, drive produces electricity for charging the battery source from a mechanical loading of an electric bike. The regenerative braking mode of operation improves the overall efficiency of the drive system. The performance of a three-phase H-bridge inverter fed PMBLDC drive with these modes are analyzed using MATLAB/Simulink software, the hardware circuit is implemented with supporting simulations in the Proteus 8.0 software and finally the electric bike is designed using 2 hp PMBLDC drive system.

New improved three‐phase hybrid multilevel inverter with reduced number of components

A new three-phase hybrid multilevel inverter configuration is proposed. The proposed inverter is modular and consists of three single-phase H-bridge inverters, one three-phase H-bridge inverter and auxiliary modules for increasing the number of output voltage levels. The performance of the proposed inverter has been compared with some of the commonly used inverters within the literature in terms of the number of components, blocking voltage and overall losses. The proposed multilevel inverter has lower number of insulated-gate bipolar transistors and gate drivers and subsequently requires a relatively simple control strategy for generating the desired output voltage. Finally, the performance of the proposed inverter has been validated via a laboratory-scale prototype along with numerical simulation.