Modified MPC based grid-connected five-level inverter for photovoltaic applications

2018 ◽  
Vol 37 (2) ◽  
pp. 971-985 ◽  
Author(s):  
Mohammad Maalandish ◽  
Seyed Hossein Hosseini ◽  
Mehran Sabahi ◽  
Pouyan Asgharian
Keyword(s):  
Control Method ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Modified Model ◽  
Content Type ◽  
Current Path ◽  
Voltage Stress ◽  
Photovoltaic Applications ◽  
Multi Level ◽  
And Control

PurposeThe main purpose of this paper is to select appropriate voltage vectors in the switching techniques and, by selecting the proper voltage vectors, be able to achieve a DC link with the same outputs and a symmetric multi-level inverter. Design/methodology/approachThe proposed structure, a two-stage DC–AC symmetric multi-level inverter with modified Model Predictive Control (MMPC) method, is presented for Photovoltaic (PV) applications. The voltage of DC-link capacitors of the boost converter is controlled by MMPC control method to select appropriate switching vectors for the multi-level inverter. The proposed structure is provided for single-phase power system, which increases 65 V input voltage to 220 V/50 Hz output voltage, with 400 V DC link. Simulation results of proposed structure with MMPC method are carried out by PSCAD/EMTDC software. FindingsBased on the proposed structure and control method, total harmonic distortion (THD) reduces, which leads to lower power losses and higher circuit reliability. In addition, reducing the number of active switches in current path causes to lower voltage stress on the switches, lower PV leakage current and higher overall efficiency. Originality/valueIn the proposed structure, a new control method is presented that can make a symmetric five-level voltage with lower THD by selecting proper switching for PV applications.

scholarly journals The multilevel inverter with clamped-diode

2019 ◽  
Vol 14 (3) ◽  
pp. 1189
Author(s):  
Trong-Thang Nguyen
Keyword(s):  
Numerical Simulation ◽  
Circuit Design ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Control Circuit ◽  
Multilevel Inverter ◽  
Power Circuit ◽  
Advantages And Disadvantages ◽  
Multi Level ◽  
And Control

<p>In this study, the author analyzes the advantages and disadvantages of multi-level inverter compared to the traditional two-level inverter and then chose the suitable inverter. Specifically, the author analyzes and designs the three-level inverter, including the power circuit design and control circuit design. All designs are verified through the numerical simulation on Matlab. The results show that even though the three-level inverter has a low number of switches (only 12 switches), but the quality is very good: the total harmonic distortion is small; the output voltage always follows the reference voltage.</p>

Study on multi-section continuum robot wire-tension feedback control and load manipulability

2020 ◽  
Vol 47 (6) ◽  
pp. 837-845
Author(s):  
Azamat Nurlanovich Yeshmukhametov ◽  
Koichi Koganezawa ◽  
Zholdas Buribayev ◽  
Yedilkhan Amirgaliyev ◽  
Yoshio Yamamoto
Keyword(s):  
Control Method ◽  
Tension Control ◽  
Estimation Model ◽  
Content Type ◽  
Wire Tension ◽  
Payload Capacity ◽  
Continuum Robot ◽  
Continuum Manipulators ◽  
And Control ◽  
The Continuum

Purpose The purpose of this paper is to present a novel hybrid pre-tension mechanism for continuum manipulators to prevent wire slack and improve continuum robot payload capacity, as well as to present a new method to control continuum manipulators’ shape. Design/methodology/approach This research explains the hardware design of a hybrid pre-tension mechanism device and proposes a mathematic formulation wire-tension based on robot design. Also, the wire-tension control method and payload estimation model would be discussed. Findings Wire-tension is directly related to the continuum manipulators’ rigidity and accuracy. However, in the case of robot motion, wires lose their tension and such an issue leads to the inaccuracy and twist deformation. Therefore, the proposed design assists in preventing any wire slack and derailing the problem of the wires. Originality/value The novelty of this research is proposed pre-tension mechanism device design and control schematics. Proposed pre-tension mechanism designed to maintain up to eight wires simultaneously.

A new three-phase multilevel DC-link inverter topology with reduced switch count for photovoltaic applications

Circuit World ◽  
2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anbarasan P. ◽  
Krishnakumar V. ◽  
Ramkumar S. ◽  
Venkatesan S.
Keyword(s):  
Power Loss ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Photovoltaic Cell ◽  
Content Type ◽  
Energy Applications ◽  
Three Phase ◽  
Photovoltaic Applications ◽  
Inverter Topology

Purpose This paper aims to propose a new MLI topology with reduced number of switches for photovoltaic applications. Multilevel inverters (MLIs) have been found to be prospective for renewable energy applications like photovoltaic cell, as they produce output voltage from numerous separate DC sources or capacitor banks with reduced total harmonic distortion (THD) because of a staircase like waveform. However, they endure from serious setbacks including larger number of capacitors, isolated DC sources, associated gate drivers and increased control difficulty for higher number of voltage levels. Design/methodology/approach This paper proposes a new three-phase multilevel DC-link inverter topology overpowering the previously mentioned problems. The proposed topology is designed for five and seven levels in Matlab/Simulink with gating pulse using multicarrier pulse width modulation. The hardware results are shown for a five-level MLI to witness the viability of the proposed MLI for medium voltage applications. Findings The comparison of the proposed topology with other conventional and other topologies in terms of switch count, DC sources and power loss has been made in this paper. The reduction of switches in proposed topology results in reduced power loss. The simulation and hardware show that the output voltage yields a very close sinusoidal voltage and lesser THD. Originality/value The proposed topology can be extended for any level of output voltage which is helpful for sustainable source application.

scholarly journals Improved Modulated Carrier Controlled PFC Boost Converter Using Charge Current Sensing Method

Energies ◽  
2018 ◽  
Vol 11 (4) ◽  
pp. 717 ◽  
Author(s):  
Jintae Kim ◽  
Chung-Yuen Won
Keyword(s):  
Control Method ◽  
Harmonic Distortion ◽  
Control Unit ◽  
Input Voltage ◽  
Boost Converter ◽  
Current Sensing ◽  
Voltage Range ◽  
Zero Current ◽  
Voltage Amplifier ◽  
Current Duration

An improved modulated carrier control (MCC) method is proposed to offer high power factor (PF) and low total harmonic distortion (THD) at a wide input voltage range and load variation. The conventional MCC method not only requires a multiplier and divider, but also is hard to be implemented with a micro controller unit without a high frequency oscillator. To overcome the problem and maintain the advantages of the conventional MCC method, the proposed MCC method adopts a current integrator, an output voltage amplifier, a zero-current duration (ZCD) demodulator of the boost inductor, and a carrier generator. Thus, it can remove a multiplier and well, as it allows for being operable with a general micro control unit. This paper presents an operation principle of the proposed control method. To verify the proposed control method, experimental results with 400 W PFC boost converter is demonstrated.

scholarly journals Circuit Structure and Control Method to Reduce Size and Harmonic Distortion of Interleaved Dual Buck Inverter

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1531
Author(s):  
Min-Gi Cho ◽  
Sang-Hoon Lee ◽  
Hyeon-Seok Lee ◽  
Yoon-Geol Choi ◽  
Bongkoo Kang
Keyword(s):  
Output Power ◽  
High Power ◽  
Control Method ◽  
Power Conversion ◽  
Harmonic Distortion ◽  
Current Mode ◽  
Total Harmonic Distortion ◽  
Current Mode Control ◽  
Circuit Structure ◽  
And Control

A new circuit structure and control method for a high power interleaved dual-buck inverter are proposed. The proposed inverter consists of six switches, four diodes and two inductors, uses a dual-buck structure to eliminate zero-cross distortion, and operates in an interleaved mode to reduce the current stress of switch. To reduce the total harmonic distortion at low output power, the inverter is controlled using discontinuous-current-mode control combined with continuous-current-mode control. The experimental inverter had a power-conversion efficiency of 98.5% at output power = 1300 W and 98.3% at output power = 2 kW, when the inverter was operated at an input voltage of 400 VDC, output voltage of 220 VAC/60 Hz, and switching frequency of 20 kHz. The total harmonic distortion was < 0.66%, which demonstrates that the inverter is suitable for high-power dc-ac power conversion.

High Step-Up Boost-Fly-Back Converter with Soft Switching for Photovoltaic Applications

2018 ◽  
Vol 28 (01) ◽  
pp. 1950014
Author(s):  
Ghasem Haghshenas ◽  
Sayyed Mohammad Mehdi Mirtalaei ◽  
Hamed Mordmand ◽  
Ghazanfar Shahgholian
Keyword(s):  
Output Voltage ◽  
Input Voltage ◽  
Magnetic Core ◽  
Soft Switching ◽  
Voltage Gain ◽  
Pv System ◽  
Voltage Stress ◽  
Photovoltaic Applications ◽  
Output Capacitor ◽  
Switch Voltage

In this paper, a novel high step-up single switch DC–DC converter with soft switching is presented. The main application of this converter is the connection of photovoltaic (PV) system to a 400[Formula: see text]V DC-bus. The proposed converter achieves high step-up voltage gain with small duty cycle by a combined boost and fly-back topology. Also, its switch voltage stress is lower than the output voltage. Besides, in the proposed converter, any auxiliary switch or magnetic core has not been used — therefore, the number of converter components has not been increased much in comparison with the conventional boost-fly-back converter. The operation principles of the converter and its theoretical operation waveforms are presented. In order to evaluate the theoretical analysis, a prototype of the converter is designed and experimentally implemented. The practical results are presented for a 100[Formula: see text]W boost-fly-back converter with input voltage of 40[Formula: see text]V and output voltage of 400[Formula: see text]V. Also, the output capacitor is designed to have less than 1% ripple on output voltage.

The compliance of robotic hands – from functionality to mechanism

2015 ◽  
Vol 35 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Rui Li ◽  
Wei Wu ◽  
Hong Qiao
Keyword(s):  
Nervous System ◽  
Control Mechanism ◽  
Control Method ◽  
Physical Structure ◽  
Robotic Assembly ◽  
Automation System ◽  
Content Type ◽  
Assembly Automation ◽  
Human Motor ◽  
And Control

Purpose – The purpose of this paper is to introduce the physical structure and the control mechanism of human motor nervous system to the robotic system in a tentative manner to improve the compliance/flexibility/versatility of the robot. Design/methodology/approach – A brief review is focused on the concept of compliance, the compliance-based methods and the application of some compliance-based devices. Combined with the research on the physical structure and the control mechanism of human motor nervous system, a new drive structure and control method is proposed. Findings – Introducing the physical structure and the control mechanism of human motor nervous system can improve the compliance/flexibility/versatility of the robot, without bringing in more complexity or inefficiency to the system, which helps in the assembly automation tasks. Originality/value – The proposed drive structure and control method are useful to build up a novel, low-cost robotic assembly automation system, which is easy to interact and cooperate with humans.

Moving Mechanism of and Control Method for a Vibration-Driven Electromagnet-Type Microrobot (Mathematical Model of Microrobot Running Straight, Investigations of Characteristics of Microrobot Running Straight and Turning by Simulation and Experiments)

2012 ◽  
Vol 24 (1) ◽  
pp. 158-164 ◽  
Author(s):  
Masahiro Isogai ◽  
◽  
Toshio Fukuda ◽  
Keyword(s):  
Mathematical Model ◽  
Permanent Magnets ◽  
Control Method ◽  
Piezoelectric Element ◽  
Input Voltage ◽  
Large Numbers ◽  
Straight Line ◽  
Motion Features ◽  
And Control ◽  
Inclined Planes

Large numbers of studies have focused on microrobots and numerous contests are held annually to develop microrobot technologies. These activities have resulted in that various types of microrobots have been proposed. They include motor, piezoelectric-element, and electromagnet microrobots. We consider a mechanism of movement and a method of control for an electro-magnet microrobot that both runs in a straight line and turns using a single electromagnet coil by adjusting the direction of the robot’s permanent magnets and the input voltage applied to the electromagnet coil. The microrobot’s straight running forward is modeled mathematically and its motion features are studied on horizontal and inclined planes through simulation and some experiments. In addition, turning characteristics is studied using an experiment.

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