scholarly journals A Novel Three-Switch Z-Source SEPIC Inverter

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 247 ◽  
Author(s):  
Baocheng Wang ◽  
Wei Tang
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Control Method ◽  
Voltage Gain ◽  
Dc Voltage ◽  
Theoretical Design ◽  
Simulation Results ◽  
Laboratory Prototype ◽  
Linear Voltage

In this paper, a novel single-phase transformerless Z-source inverter (ZSI) derived from the basic SEPIC topology, which is named SEPIC-based ZSI, is proposed. The negative end of the input DC voltage of this topology is directly connected to the load and grounded, which can completely eliminate leakage current. Furthermore, this topology has some attractive characteristics such as buck–boost capability, impressive voltage gain, linear voltage gain is realized by a simple control method, and so on. The theoretical design and simulation results are demonstrated by corresponding experiments carried out on a 500 W laboratory prototype controlled by using a DSP TMS320F28335 controller combined with a FPGA SPARTAN-6.

scholarly journals A New CUK-Based Z-Source Inverter

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 313 ◽  
Author(s):  
Baocheng Wang ◽  
Wei Tang
Keyword(s):  
Performance Evaluation ◽  
Single Phase ◽  
Control Method ◽  
Voltage Gain ◽  
Test Results ◽  
Cuk Converter ◽  
Operational Principle ◽  
Linear Voltage ◽  
A Performance

This paper proposes a new three-switch single-phase Z-source inverter (ZSI) based on a CUK converter, which is named a CUK-based ZSI. This topology has characteristics of buck‒boost capability and dual grounding. In addition, the voltage gain of proposed inverter is higher than those of the single-phase quasi-Z-source and semi-Z-source inverters. Aside from that, a simple control method is presented to achieve the linear voltage gain. The operational principle of the proposed topology is described. Finally, a performance evaluation is carried out and the test results verify the effectiveness of the proposed solution.

Control Method for a Single-phase Line-line 7-level Inverter with Asymmetrical DC Voltage Sources

2014 ◽  
Vol 134 (10) ◽  
pp. 904-912
Author(s):  
Hideki Ayano ◽  
Ryuta Oosumi ◽  
Shotaro Sakamoto ◽  
Yoshihiro Matsui
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Phase Line ◽  
Dc Voltage

scholarly journals Voltage harmonics reduction in single phase 9-level transistor clamped H-bridge inverter using nearest level control method

2020 ◽  
Vol 20 (3) ◽  
pp. 1725
Author(s):  
Nurul Ain Mohd Said ◽  
Wail Ali Ali Saleh ◽  
Wahidah Abd Halim
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Modulation Scheme ◽  
Level Control ◽  
Switching Losses ◽  
Harmonic Content ◽  
Ieee Standard ◽  
Voltage Harmonics ◽  
Theoretical Analyses ◽  
Laboratory Prototype

This paper proposes a nearest level control method based modulation scheme for a 9-level symmetrical Transistor Clamped H-bridge (TCHB) inverter. The topology has gained increasing research focus due to its advantages in obtaining high quality output while using a reduced number of electronic components. The device count for obtaining a 9-level output voltage is it uses 10 active switches as compared to the 16 being used in a conventional 9-level cascaded H-Bridge (CHB) inverter. The significant contribution of the research is the development of the NLC modulation technique that operates at the fundamental frequency, thus reducing switching losses, and able to reduce harmonic content significantly. The reduced harmonic content can lessen the power quality problem. The NLC modulation scheme, shows that the overall THD is reduced without the need for filtration. The 50 values of harmonic content will be count that follows the IEEE Standard 519. MATLAB/Simulink based simulations and experimental results obtained from the laboratory prototype of a single-phase TCHB inverter feeding a R load validate the theoretical analyses and effectiveness of the proposed modulation scheme.

scholarly journals Single switch Z source/quasi Z source DC-DC converters

2021 ◽  
Vol 10 (1) ◽  
pp. 68
Author(s):  
V Saravanan ◽  
M Sabitha ◽  
V Bindu ◽  
Venkatachalam K M ◽  
M Arumugam
Keyword(s):  
Proper Choice ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Design Guideline ◽  
Boost Converters ◽  
Dc Voltage ◽  
Photovoltaic Applications ◽  
Simulation Results ◽  
High Output

<span>This paper analyzes a family of high step up single switch switched capacitor boost converters and Z-source/quasi Z-source dc-dc converters to provide high output dc voltage gain, a proper choice for photovoltaic applications. The operating principles, parameters design guideline of these converters are presented along with simulation results.</span>

Digital Single-Phase Thyristor AC Voltage Regulator Research Based on Fuzzy PID and APF Control

2012 ◽  
Vol 424-425 ◽  
pp. 1262-1265
Author(s):  
Feng Xiang Li ◽  
Gu Chuan
Keyword(s):  
Compensation Effect ◽  
Single Phase ◽  
Control Method ◽  
Pwm Control ◽  
Fuzzy Pid ◽  
Harmonic Compensation ◽  
Dc Voltage ◽  
Fuzzy Pid Controller ◽  
Output Stability ◽  
The Ideal

In the APF system, PWM control plays an important role in improvement of power quality and harmonic compensation. Given the current PWM control method assumes DC voltage as constant. So the APF operating loss and energy exchange among system components cause the DC voltage the certain fluctuation which deteriorates the effect of harmonic compensation. This paper presents an improved PWM method which uses the designed fuzzy PID controller to control the deviation between the calculated voltage and the set one, adjust the size of the duty cycle to modify PWM waves, and make the output stability in the new set-point. Finally, it shows the simulation results in this paper. This improved PWM approach makes the AV output to avoid the influence from the DC fluctuation, and obtains the ideal harmonic compensation effect

scholarly journals An Improved Droop-Based Control Strategy for MT-HVDC Systems

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 87 ◽  
Author(s):  
Fazel Mohammadi ◽  
Gholam-Abbas Nazri ◽  
Mehrdad Saif
Keyword(s):  
Control Strategy ◽  
Large Scale ◽  
Reactive Power ◽  
Control Method ◽  
Power Sharing ◽  
Frequency Regulation ◽  
Dc Voltage ◽  
Hvdc System ◽  
Active And Reactive Power ◽  
Simulation Results

This paper presents an improved droop-based control strategy for the active and reactive power-sharing on the large-scale Multi-Terminal High Voltage Direct Current (MT-HVDC) systems. As droop parameters enforce the stability of the DC grid, and allow the MT-HVDC systems to participate in the AC voltage and frequency regulation of the different AC systems interconnected by the DC grids, a communication-free control method to optimally select the droop parameters, consisting of AC voltage-droop, DC voltage-droop, and frequency-droop parameters, is investigated to balance the power in MT-HVDC systems and minimize AC voltage, DC voltage, and frequency deviations. A five-terminal Voltage-Sourced Converter (VSC)-HVDC system is modeled and analyzed in EMTDC/PSCAD and MATLAB software. Different scenarios are investigated to check the performance of the proposed droop-based control strategy. The simulation results show that the proposed droop-based control strategy is capable of sharing the active and reactive power, as well as regulating the AC voltage, DC voltage, and frequency of AC/DC grids in case of sudden changes, without the need for communication infrastructure. The simulation results confirm the robustness and effectiveness of the proposed droop-based control strategy.

scholarly journals Research on an Improved Single-Phase Unisolated Grid-Connected Photovoltaic Inverter

2021 ◽  
Vol 23 (2) ◽  
pp. 123-130
Author(s):  
Baoge Zhang ◽  
Deyu Hong
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Current Problem ◽  
Input Voltage ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Voltage Clamping ◽  
The Common ◽  
Simulation Results ◽  
Inverter Topology

An improved single-phase unisolated grid-connected photovoltaic inverter topology is proposed to solve the common mode leakage current problem of unisolated grid-connected photovoltaic inverters. By analyzing the topology structure and voltage clamping principle of the improved inverter, the topology can maintain the same low input voltage as the full-bridge inverter, and ensure that the common-mode voltage in the continuation mode is clamped to the midpoint voltage of the bus, so as to effectively reduce the common-mode leakage current caused by the common-mode voltage suspension in the continuation mode. Moreover, the common-mode leakage current of the improved topology is smaller than that of the traditional H6-2D topology at similar conversion efficiency. The simulation results on MATLAB /Simulink platform show that the topology is feasible and effective.

Leakage Current Paths in PV Transformer-Less Single-Phase Inverter Topology and Its Mitigation through PWM for Switching

2015 ◽  
Vol 6 (1) ◽  
pp. 148
Author(s):  
M. N. H. Khan ◽  
K. J. Ahmad ◽  
S. Khan ◽  
M. Hasanuzzaman
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Current Issue ◽  
Cost Effective ◽  
Parasitic Capacitance ◽  
Phase Inverter ◽  
Simulation Results ◽  
Single Phase Inverter ◽  
Distribution Generation ◽  
Inverter Topology

<p>The Photovoltaic (PV) is a part and parcel and well known for cost-effective and easy to operatefeatures when it is used with transformer-less inverter-based grid-tied distribution generation systems. It reduces the leakage current issue that actually occurs making paths from PV penal to ground. In this paper has been addressed this issue as main problem for reducing leakage current. Moreover, here iscompared the proposed topology’s results to AC and DC-based transformer-less topologies. The possibilities of larger number of leakage current paths indicatepower loss, which is the focus of work in this paper for different switching conditions. The results on leakage current paths using PSpice with different parasitic capacitance values from inverters of different topologies are compared with the simulation results of the topology proposed in this paper.</p>

Discontinuous Control and Stability Analysis of Step-Down DC-DC Voltage Converters

2020 ◽  
Vol 38 (3A) ◽  
pp. 446-456
Author(s):  
Bashar F. Midhat
Keyword(s):  
Stability Analysis ◽  
Lyapunov Stability ◽  
Control Method ◽  
Power Electronic ◽  
Electronic Circuits ◽  
Dc Voltage ◽  
Power Electronic Circuits ◽  
Lyapunov Stability Criterion ◽  
Control Step ◽  
Step Down

Step down DC-DC converters are power electronic circuits, which mainly used to convert voltage from a level to a lower level. In this paper, a discontinuous controller is proposed as a control method in order to control Step-Down DC-DC converters. A Lyapunov stability criterion is used to mathematically prove the ability of the proposed controller to give the desired voltage. Simulationsl1 are performedl1 in MATLABl1 software. The simulationl1 resultsl1 are presentedl1 for changesl1 in referencel1 voltagel1 and inputl1 voltagel1 as well as stepl1 loadl1 variations. The resultsl1 showl1 the goodl1 performancel1 of the proposedl1 discontinuousl1 controller.

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