scholarly journals Dynamic Sliding Mode Evolution PWM Controller for a Novel High-Gain Interleaved DC-DC Converter in PV System

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Taizhou Bei ◽  
Ping Wang ◽  
Liu Yang ◽  
Zhe Zhou
Keyword(s):  
Sliding Mode ◽  
High Gain ◽  
Input Current ◽  
The Novel ◽  
Pv System ◽  
Control Approach ◽  
Voltage Stress ◽  
Interleaved Boost Converter ◽  
Short Time ◽  
Dynamic Sliding Mode

Considering the disadvantages of the traditional high-gain DC-DC converter such as big size, high voltage stress of switches, and large input current ripple, a novel high-gain interleaved boost converter with coupled-inductor and switched-capacitor was proposed correspondingly and the operation principle together with the steady-state analysis of this converter was also described. Besides, a new control approach-dynamic sliding mode evolution PWM controller (DSME PWM) for the novel topological converter based on both dynamic evolution and sliding mode control was also presented. From the simulation results and experimental validation the proposed converter can fulfill high-gain boost, low ripple of both the input current and the output voltage. Furthermore, MPPT technique can be also achieved in a short time by simulation. The efficiency and stability of the converter proposed in this paper can be improved.

scholarly journals High Gain and Reduced Switch Stress DC-DC Converter Topology for PV System

2018 ◽  
Vol 7 (04) ◽  
pp. 23808-23816
Author(s):  
C. Srideepa ◽  
S.Sathish Kumar ◽  
R. Nagarajan
Keyword(s):  
High Gain ◽  
Photovoltaic System ◽  
Voltage Gain ◽  
Pv System ◽  
Power Switch ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Converter Topology ◽  
State Resistance ◽  
Two Hybrid

This paper presents a new high step-up isolated DC-DC converter topology for photovoltaic system. The suggested configuration provides a converter with high voltage gain and reduced switch stress by using three coupled inductor with two hybrid voltage multiplier cell. The operation of the proposed converter is based on a charging capacitor with a single switch in its structure. A passive clamp circuit composed of capacitors and diodes is employed in the converter structure for lowering the voltage stress on the power switch as well as increasing the voltage gain of the converter. Since the voltage stress is low in the provided topology, a switch with a small ON-state resistance can be used. As a result, the losses are decreased and the efficiency is increased. The design of DC-DC boost converter is also discussed in detail. Simulation of DC-DC converter is performed in MATLAB/Simulink and the result are verified

Explicit nonlinear model predictive control tracking control based on a sliding mode observer for a quadrotor subject to disturbances

2019 ◽  
Vol 42 (2) ◽  
pp. 214-227 ◽  
Author(s):  
Nadia Miladi ◽  
Habib Dimassi ◽  
Salim Hadj Said ◽  
Faouzi M’Sahli
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Nonlinear Model ◽  
Trajectory Tracking ◽  
Tracking Control ◽  
Sliding Mode ◽  
High Gain ◽  
Sliding Mode Observer ◽  
Nonlinear Model Predictive Control ◽  
Control Approach

In this paper, we propose an explicit nonlinear model predictive control (ENMPC) method based on a robust observer to solve the trajectory tracking problem for outdoor quadrotors. We take into consideration the external aerodynamic disturbances present in the dynamics of the Newton-Euler quadrotor model. To overcome the effects of these disturbances, a high gain observer combined with a first order sliding mode observer are proposed to estimate both the states and the unknown disturbances using the only positions and angular measurements of the quadrotor. The estimated signals are then used by the predictive controller in order to ensure the trajectory tracking objective. Despite the presence of bounded disturbances, the convergence of the composite controller (ENMPC technique with the latter observers) is guaranteed through a stability analysis. Theoretical results are validated with some numerical simulations showing the good performances of the proposed tracking control approach.

scholarly journals Design and Analysis of a High-Gain Step-Up/Down Modular DC–DC Converter with Continuous Input Current and Decreased Voltage Stress on Power Switches and Switched-Capacitors

2021 ◽  
Vol 13 (9) ◽  
pp. 5243
Author(s):  
Maysam Abbasi ◽  
Ehsan Abbasi ◽  
Li Li ◽  
Behrouz Tousi
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Renewable Energy Sources ◽  
High Gain ◽  
Voltage Regulation ◽  
Input Current ◽  
Switched Capacitors ◽  
Voltage Stress ◽  
Power Switches ◽  
Continuous Input

Due to concerns, such as global warming and depletion of fossil fuels, countries are forced to integrate energy storage devices (ESSs) and renewable energy sources (RESs), such as photovoltaic (PV) systems, wind turbines and fuel cells, into their power networks. Here, a new high gain DC–DC converter with step-up/down ability is proposed for modern applications. Since this converter provides high variable voltage gain, it can be employed for output voltage regulation purposes in RESs such as solar panels. Additionally, this converter provides a remarkable reduction in voltage stress on the switched capacitors and power switches. Due to its modular structure obtained by employing switched-capacitors (SCs), it is possible for this topology to gain a very high voltage conversion ratio using low duty-cycles produced by a simple and straightforward control system. To be specific, the more the number of SC cells increase, the more the output voltage increases. The proposed converter has a continuous input current allowing to extract the maximum power from RESs like PV panels. It should be noted that the application of this converter is not limited to the aforementioned ones since it can be used in various applications needing high voltage gains such as generating the desired voltage level in high voltage direct current (HVDC) systems especially their transmission lines. For validating the performance of the proposed structure, comprehensive comparisons and experimental results are presented.

Dynamic sliding mode-based attitude stabilisation control of satellites with angular velocity and control constraints

2018 ◽  
Vol 41 (4) ◽  
pp. 934-941 ◽  
Author(s):  
Chunmei Yu ◽  
Xun Xie
Keyword(s):  
Angular Velocity ◽  
Sliding Mode Control ◽  
Sliding Mode ◽  
External Disturbance ◽  
Convergence Time ◽  
Small Radius ◽  
Control Law ◽  
Control Approach ◽  
Mode Control ◽  
Dynamic Sliding Mode

This work presents a novel control approach to the attitude stabilisation problem of rigid satellites with external disturbance, control constraint, and angular velocity constraint. The controller is developed in the framework of dynamic sliding mode control. A dynamic sliding mode surface is preliminarily chosen, and then a structure-simple sliding mode control law is synthesised. It is proved that the proposed control law can successfully accomplish the attitude stabilisation manoeuvre. The attitude is exponentially stabilised, and the angular velocity is stabilised with an exponential rate to a ball with a small radius. In comparison with the static sliding mode surface-based controllers, the proposed approach can provide a fast convergence rate. The system convergence time can be shortened by dynamically updating the control parameters in the sliding mode. Simulation results are presented to examine the feasibility of the presented solution.

scholarly journals Sliding Mode Controllers for Standalone PV Systems: Modeling and Approach of Control

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Y. Chaibi ◽  
M. Salhi ◽  
A. El-jouni
Keyword(s):  
Sliding Mode ◽  
Electrical Energy ◽  
Maximum Power ◽  
Output Current ◽  
Pv System ◽  
Maximum Power Point ◽  
Control Approach ◽  
Point Tracking ◽  
Current Controller ◽  
Power Point

This paper presents a single-phase standalone photovoltaic (PV) system with two stages of converters. The aim of this work is to track the maximum power point (MPP) so as to transfer the maximum available power to the load and to control the output current in order to feed the AC load by a sinusoidal current. These goals are attained by using the sliding mode to design control laws in order to command the boost DC-DC and the inverter switches. Thus, a maximum power point tracking (MPPT) and an output current controller based on the sliding mode are proposed. The innovative aspect of this work is to propose a standalone PV system with the controllers based only on the sliding mode control approach. The proposed system is modeled and simulated under MATLAB Simulink under fast variations of irradiance and temperature. Then, the obtained results using the suggested MPPT are compared to those using the incremental conductance (IC) method. These results demonstrate the superiority of the sliding mode MPPT in terms of the tracking speed, the efficiency, and the time of response. Moreover, the current controller provides an output current of high quality with a THD of 3.47%. Furthermore, for accurate results, these controllers are evaluated under the fluctuations of two daily climatic profiles (sunny and cloudy) and compared those of the IC method. The results illustrate that the sliding mode MPPT has the potential of generating more electrical energy than the IC MPPT with benefits of up to 13.02% for the sunny daily profile and 27.57% for the cloudy one.

scholarly journals Indirect Matrix Converter-Based Grid-Tied Photovoltaics System for Smart Grids

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5405
Author(s):  
Thomas Geury ◽  
Sonia Ferreira Pinto ◽  
Johan Gyselinck ◽  
Patrick Wheeler
Keyword(s):  
Smart Grids ◽  
Power Flow ◽  
Sliding Mode ◽  
Harmonic Distortion ◽  
Matrix Converter ◽  
International Standards ◽  
Pv System ◽  
Control Approach ◽  
Pv Array

This paper proposes an Indirect Matrix Converter (IMC)-based grid-tied Photovoltaic (PV) system for Smart Grids (SGs). The PV array injects current in the ‘dc link’ of the IMC through an inductive link, and is connected to the SG with shunt and series connections, allowing for the compensation of current- and voltage-related Power Quality (PQ) issues, respectively, for the sensitive loads and the SG connection. A direct sliding mode-based controller is proposed to guarantee nearly sinusoidal currents in the connection to the SG, and sinusoidal voltages guaranteeing compliance with international standards, when supplying the sensitive loads. Additionally, a novel control approach for the ‘dc link’ voltage is synthesised to allow for the control of both the PV array current and the power flow to the SG. To guarantee the semiconductors safe commutation an asynchronous commutation strategy is derived. Simulation and experimental results show that the proposed system significantly improves PQ in the SG, minimizing the total harmonic distortion of the currents injected in the SG, and guaranteeing the quality of the voltage supplied to the sensitive loads, even in the occurrence of voltage sags or overvoltages.

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