Bridge Inverter Research Articles

Solar Convertor Performance Analysis Fitting Load at Two Different Local Areas

Multilevel converters are divided into diode clamp inverters, flying capacitor inverters and cascade inverters. The main objective of this work is to design a solar energy system to move loads away from production points and study the system to improve its reliability and efficiency. And analyze the system with the inverter field-oriented feedback control under transient load conditions to analyze the efficiency of the system in driving motor loads. The simulated work in this work demonstrates the possibility of using a photovoltaic cell to power a motor via a three-phase bridge inverter. It can be concluded that this work will contribute to the analysis of solar modules for the operation of a motor using a PWM inverter. The work also aims to perform an analysis of the solar energy system that moves loads away from the point of generation. The drive commands at the load points are analyzed during the process, taking into account the transient load conditions.

Accurate Computation of Mutual Inductance of Non Coaxial Pancake Coils

The computation of self and mutual inductances of coils is a classic problem of electrical engineering. The accurate modeling of coupled coils has received renewed interest with the spread of wireless power transfer systems. This problem has been quite well addressed for coplanar or perfectly coaxial coils but it is known that the misalignment conditions easily lead to a sharp decrease in the efficiency. Hence, it is crucial to take misalignment into account in order to properly design the overall wireless power transfer system. This work presents a study to compute analytically the mutual inductance of non-coaxial pancake coils with parallel axes. The accuracy of the proposed methodology is tested by comparison with the numerical results obtained using the tool Fast-Henry. Then, a wireless power transfer system, comprising a full bridge inverter is considered, showing the impact of the misalignment on the coupling between two pancake coils and, thus, between the source and the load.

Design and Simulation of Seven Level Cascaded H Bridge Inverter for Medium Power Applications

In the recent years, multilevel inverters (MLI) are highly being used for medium power and high-power applications because of several merits such as low voltage stress on the power switches, low electromagnetic interferences, low dv/dt ratio to supply lower harmonic contents in the output voltage and current. Multilevel inverters have become more popular in electric high-power application with the promise of very low disturbances and the possibility to function at lower switching frequencies than ordinary two-level inverters. It is also more efficient since the inverter has a component which operates the switching power devices at line frequency. So that there is no need for all switches to work in high frequency it leads to simpler and more reliable control of the inverter. The seven-level inverter with reduced number of switches with PWM (Pulse Width Modulation) switching is simulated. It is observed that the pulse generation using PWM switching leads to further reduction of THD. Simulations of the proposed system have been carried out in MATLAB/SIMULINK environment to show its effectiveness of Seven Level Inverter Topology for power quality issues.

Performance analysis of a transmission line connected with UPFC designed with three level cascaded H bridge inverter with generalized SVM technique using PI, FUZZY LOGIC, ANN and ANFIS controllers

Power System Networks when subjected to faults behave in an abnormal pattern which could be called Non Linear behaviour. Conventional Controlling methods offer limited support to the controlling units of the FATCS devices in making the Power System network less effected by the faulty conditions. The Efficiency enhancement of UPFC close to the Short-term and Dynamic stability improvement integrating ANFIS, ANN, Fuzzy Logic in addition to a PI controller is evaluated. The UPFC is attached to the IEEE five bus device among the buses three as well as four for reading its capacities. The UPFC is embedded with a three degree Plunged H Bridge inverter. The Action time taken by UPFC with ANFIS, ANN, Fuzzy and PI Controllers are calculated. The tool response to the advice regulates is extraordinarily plenty faster in ANFIS than in ANN, Fuzzy Logic and PI controller primarily based UPFC. This element is observed out by using using calculating the resolving time of the energy wave in all of the four cases of mistakes like LG, LL, LLG, LLL and also even when the hundreds are modified from regular to particularly Inductive and extraordinarily capability. The enhancement in overall performance of UPFC with ANFIS Controller over the ANN, Fuzzy Reasoning further to the conventional PI controller based completely UPFC is proven ultimately very last effects. The Simulations are lugged the use of MATLAB Software utility.

Modeling and performance of Hybrid Energy System based Cascaded H Bridge Inverter using Space Vector Pulse Width Modulation Technique

Modeling and performance of Hybrid Energy System based Cascaded H Bridge Inverter using Space Vector Pulse Width Modulation Technique

Boost Voltage Single Phase Full Bridge Inverter with No Voltage Drop Based on Switched Capacitor

In this paper, a voltage-boost-type non-voltage drop single-phase full-bridge inverter connected to a switched-capacitor structure is proposed. The output voltage of the inverter is controlled by the pulse width modulation of a DSP to control the lead and break of the active switches. The full-bridge switches work at low frequency; the other switches work at high frequency. The inverter uses two capacitor modules to charge and discharge alternately so as to overcome the problem of voltage drop on the output side of the inverter in the transition stage from series capacitor discharge to parallel charge. By analyzing the charge–discharge characteristics of the RC charge–discharge circuit, the capacitor charge–discharge cycle can be adjusted to alter the output voltage within a certain range. The results from the physical construction verify the Simulation results achieved well, which demonstrates satisfactory performance that supports the verification of the above theory.

Condition monitoring of IGBT modules using online TSEPs and data‐driven approach

The nonlinear operating characteristics associated with the power electronic converters result in high mechanical and thermal stresses for the power modules. These stresses collectively result in failure modes such as wear-out and sudden failures, which lead to power loss for the system. To overcome these aspects, this paper proposes a condition monitoring approach based on data-driven methods for power modules. The proposed approach is aimed at achieving early detection of power module failure mode by measuring the temperature sensitive electrical parameters (TSEPS) with a measurement and monitoring unit (MMU). To develop the proposed monitoring approach, 12 different online TSEPs of insulated gate bipolar transistor (IGBT) power module are measured with the MMU and trained with a support vector data descriptor classifier. The training process is carried out with a two-chip half bridge IGBT leg which is further operated in a single-phase full bridge inverter configuration during the testing process. Both the training and testing processes of the developed classifier are carried out for IGBT operation at multiple temperatures, and multiple faults to identify the repeatability of the TSEPs. The results of numerical simulations and experimental analysis identified 96.3% training accuracy and 2.9% error in testing accuracy at 90°C junction temperature for degradation identification. For the failure mode classification, the training accuracy is identified to be 98.6%, and 100% testing accuracy at 25°C.

Dead‐Time Elimination PWM with Switching Times Sharing for H Bridge Inverter

In this paper, the novel on‐off modes including 12 conduction states is presented for H bridge in one switching period. Based on the novel on‐off mode, the dead‐time elimination pulse width modulation (PWM) is presented with good switching times sharing effect. The digital judgment method of output current polarity is proposed for the dead‐time elimination PWM. The PWM generator is integrated in the field‐programmable gate array. Simulation and experimental results are provided to validate that the proposed PWM can be applied to H‐bridge voltage source inverter with good performance. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Small-Signal Models of Resonant Converter With Consideration of Different Duty-Cycle Control Schemes

Duty-cycle control is a widely used control method of resonant converters. In this article, the existing model of duty-cycle controlled resonant converters is found to have discrepancy compared with the simulation and experimental results. The reason behind is investigated, showing the phase change in the output voltage of the inverter bridge caused by the duty-cycle perturbation was ignored in the existing model. The phase change law is highly dependent on the duty-cycle scheme used, which is further determined by the forms of the carriers and the switching sequences of the resonant converters. With this consideration, improved models of both full-bridge and half-bridge resonant converters with different duty-cycle control schemes are rederived. It is revealed that different duty-cycle control schemes lead to different phase curves of the duty-cycle-to-output-voltage transfer functions, therefore care should be taken when selecting the appropriate duty-cycle control scheme. In the end, a series-series compensated wireless power transfer system is built to verify the validity of the proposed models.

Single‐stage pulse frequency controlled AC–AC resonant converter for different material vessel induction cooking applications

SummaryThis paper presents a single‐stage AC–AC resonant converter configuration for different material vessel induction cooking. The proposed configuration features input power factor correction, boost operation, and integrated bridge inverter configuration for multiple loads. In this topology the inverter legs are operated at two different frequencies to power induction cooking loads of steel and aluminum vessels. The induction cooking loads are operated at frequencies closer to their respective resonant frequencies. The load powers are independently controlled by pulse frequency modulation (PFM) technique. The proposed topology eliminates the use of electromechanical switches. The proposed single‐stage AC–AC resonant converter configuration has been tested with two different vessels of steel and aluminum. The simulation and experimental results of the proposed configuration are in good agreement. This topology offers the advantages of low component count, high efficiency, and suitability for different material induction cooking.

Design and Implementation of a Solar Panel Inverter as STATCOM Compensator

A power system suffers from different losses, which can cause tragic consequences. Reactive power presence in the power system increases system losses delivered power quality and distorts the voltage. As a result, many researches are concerned with reactive power compensation. Moreover, reactive power should not be transmitted through a transmission line to a longer distance. Thus, Flexible AC Transmission Systems (FACTS) devices such as static synchronous compensator (STATCOM), static volt-ampere compensator (SVC), and unified power flow controller (UPFC) are utilized to overcome these issues. The necessity of balancing resistive power generation and absorption throughout a power system becomes a big concern in the electrical systems for reactive power compensation. Static synchronous compensator STATCOM is a shunt device used for the generation or absorption of reactive power as desired. STATCOM provides smooth and fast compensation and power factor correction. In this thesis, a solar Static synchronous compensator takes the DC input from the solar panel and inverted utilizing an H-bridge inverter. This topology is used for reactive power compensation and power factor correction at the load side. The simulation was done using MATLAB Simulink simulation tools. The system model was built using a single solar array for DC input and controlled using perturbation and observe method to maximize its power output. The STATCOM model was built using for high power MOSFETs to perform H- bridge inverter. The STATCOM was controlled using a hysteresis band current control using a PI controller to inject the current into the system. A hardware prototype of STATCOM was built and controlled using an Arduino microcontroller. The simulation results have demonstrated the STATCOM model of reactive power compensation and correcting the power factor under different loads of conditions. It also highlighted the proportional relation between reactive power presence and the increased cost of electricity bills. The proposed smart meter of STATCOM gives accurate reading and measurement. Overall, the simulated results showed a satisfactory level of compensation of reactive power and power factor correction. The system contained three significant parts; solar array, H- bridge inverter, and the PI controller. The smart meter circuit was capable of displaying readings regarding input solar voltage, current, and power factor on the LCD screen.

A Reduced Switch Count and THD Analysis in Cascaded H Bridge Multi-level inverter Topology

Designing of a multilevel inverter is required for power conversion with good efficiency, less switching loss, less THD values related to voltage and current . In a multi-level inverter, the desired output value depends on the harmonic values so as to increase the levels in output. This paper presents a 9-level cascaded H bridge inverter and a reduced number of switching devices.The developed H bridge inverter is analyzed in terms of THD values at different loads. The developed H bridge inverter is compared with PD,POD,APOD techniques in terms of THD values. Based on simulation results it has been observed that the developed H bridge inverter system performs well in terms of voltage and current THD values and achieve good efficiency due to less loss.

Neutral Point Clamped Transformer-Less Multilevel Converter for Grid-Connected Photovoltaic System

Transformer-less (TL) inverter topologies have elicited further special treatment in photo-voltaic (PV) power system as they provide high efficiency and low cost. Neutral point clamped (NPC) multilevel-inverter (MLI) topologies-based transformer-less are being immensely used in grid-connected medium-voltage high-power claims. Unfortunately, these topologies such as NPC-MLI, full-bridge inverter with DC bypass (FB-DCBP) suffer from the shoot-through problem on the bridge legs, which affect the reliability of the implementation. Based on the previous above credits, a T type neutral point clamped (TNP)—MLI (TNP-MLI) with transformer-less topology called TL-TNP-MLI is presented to be an alternate which can be suitable in the grid-connected PV power generation systems. The suggested TL-TNP-MLI topologies free from inverter bridge legs shoot-through burden, switching frequency common-mode current (CMC), and leakage current. The control system of the grid interface with hysteresis current control (HCC) strategy is proposed. The effectiveness of the proposed PV connected transformer-less TNP-MLI topology with different grid and PV scenario has been verified through the MATLAB/Simulink simulation model and field-programmable gate area (FPGA)-based experimental results for a 1.5 kW system.

Analysis on unbalanced compensation of star - connected Cascade H - bridge inverter

In unbalanced compensation current situation, it is necessary to take appropriate control strategies to ensure that the star connection cascade static reactive power generator of the dc side voltage balance, the commonly used methods for injecting zero sequence voltage, this paper introduce current unbalance degree to analyze the compensation ability of plant, gives the scope of compensation is derived, by means of simulation demonstrate the validity of the derived, for the star connection series H bridge the application and selection of multilevel SVG has the significance.

A novel soft-start method for SVG based on D-axis orientation

In this paper, a novel method for shock-free soft-start is proposed. The novel method can realize the aim of no-overshoot and inrush of current during the entire soft-start process, thus the start process is safe, stable, and reliable. When the uncontrolled rectification stage ends, a sinusoidal signal synchronized with the grid voltage is generated through dq coordinate transformation and D-axis orientation, then the signal is transmitted to the three-phase inverter bridge. The AC voltage output of the inverter bridge is superimposed on both ends of the soft-start resistor along with the grid. The open-loop control method is adopted to gradually reduce the modulation ratio of the sinusoidal PWM wave until the capacitor voltage on the DC side reaches the rated voltage value, then the soft-start resistor is removed, which means the shock-free soft-start process is completed. Experimental results prove the effectiveness and feasibility of the control strategy proposed in this paper.

Research on Structure Design of New Energy Photovoltaic Inverter

With the increase of energy demand, primary energy is drying up. In order to achieve sustainable development, renewable energy and new energy research is imperative.The research and development of solar photovoltaic inverter can supplement and improve the existing energy structure, which has long-term practical significance.In this paper, the structure design of solar photovoltaic inverter power supply is studied. The power supply adopts lead-acid battery energy storage and full bridge inverter structure. At the same time, the paper studies the design of power supply protection circuit to realize battery reverse connection protection and MOSFET overvoltage protection.

Fault diagnosis of VSG inverter under grid connection

Under different working conditions, the output variable waveform corresponding to the same fault will be different. This article introduces the VSG inverter model under grid connection and verifies the correctness of the model. The three-phase current of the inverter bridge arm is selected as the research object, and the time-domain two-dimensional graph is formed as the And classify single IGBT and 2 IGBT open circuit faults, and encode various faults. eature vector; the deep convolutional neural network is established and the fault diagnosis is performed, and the feature vector is used as the input and the corresponding fault code is the output. The training simulation realizes and verifies the feasibility and accuracy of the fault diagnosis of the VSG inverter using the deep convolutional neural network.

Fault-Tolerant Operation Control Strategy for Combined Winding Bearingless Flux-Switching Permanent Magnet Motor Drive System With One Opened Phase

The failure of the inverter bridge arm or the open circuit of the phase winding may occur during the operation of a combined winding bearingless flux-switching motor, causing both rotor rotation and suspension to malfunction, hence fault-tolerant control is vital for the motor's reliability and stability. In this paper, a fault-tolerant operation control strategy for combined winding bearingless flux-switching permanent magnet motors under open-circuit fault condition is proposed. Firstly, how to control the electromagnetic torque and suspension force acting on the rotor with the combined winding structure is explained, and then the mathematical models of the torque and suspension force which can be controlled individually by different current components are deduced in detail. Afterward, the relation of the phase current without and with winding fault is discussed, and the operation conditions of maintaining constant torque and suspension force after fault are demonstrated. Whereupon, the fault-tolerant control block diagram is constructed. Finally, the experimental results are presented to demonstrate the performance of the proposed strategy.

A Duty Cycle Controlled ZVS Buck Converter With Voltage Doubler Type Auxiliary Circuit

DC–DC converters have wide applications in industries, motor drive circuits, electric vehicles, and power supplies. In traditional converters hard switching occurs due to switching losses. This imposes constraints on the converter’s efficiency which results in heat dissipation and reduction in the converter’s life. The proposed converter aims to encounter the hard switching problem with the provision of soft switching features. The presented topology is efficient with respect to the features of cost, compact size and durable lifetime of converter topology with the provision of low switching stresses. This research work proposes a novel stepdown converter with zero voltage switching characteristics. With the use of half bridge inverter switches and series resonant components in the auxiliary circuit, the target of zero voltage switching and reduction in switching stresses has been achieved. The proposed 500 W converter is designed to operate at frequency of 100 KHz with 300 V source input voltage. Output voltage of the converter is 150 V.

Design of online uninterruptible power supply with AC output

This paper shows the design of an on-line uninterruptible power supply with STM32 as the main controller. It contains rechargeable batteries as the energy storage device and uses inverter technology as the core which can make 29V∼42V AC input to 30V AC RMS output. The system uses STM32 as the control core, it is divided into main controller, autotransformer module, rectifier bridge module, PFC module, inverter module, booster module, battery pack, current and voltage detection module. When the utility power is connected, it supplies power to the inverter module and if it is disconnected, the main control terminal allows the battery to supply power to the inverter module in time, thereby realizing online uninterrupted power supply. Experimental results show that this system can supply power to the load without interruption, and has a good load regulation rate and voltage regulation rate.