scholarly journals A New Converter for Non-Isolated PV Systems

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1716
Author(s):  
Huaibao Wang ◽  
Zhigang Lu
Keyword(s):  
Comparative Analysis ◽  
Leakage Current ◽  
Control Strategy ◽  
Control Structure ◽  
Experimental Tests ◽  
Experimental Results ◽  
Photovoltaic System ◽  
Pv Systems ◽  
Input Terminal ◽  
And Control

A new converter for the non-isolated PV (photovoltaic) system is presented in this paper. It has the advantage that the input terminal of the proposed converter is connected to the output negative terminal. In this way, the parasitic capacitance is bypassed to eliminate the undesirable leakage current. The proposed converter can achieve the step-up voltage with four switches only. Aside from that, the carried-based modulation is used, and the control structure is simple. The article analyzes the working modes and control strategy of the proposed converter. In addition, a comparative analysis is provided. The feasibility of the proposed converter under different working modes is verified by simulation. Finally, the digital control prototype with DSP plus FPGA is established and the experimental tests are carried out. The experimental results verify the effectiveness of the proposed converter.

Control Strategy of the Hybrid Energy Storage System for Leveling Off Fluctuating Power Output of Stand-Alone Photovoltaic System

2013 ◽  
Vol 860-863 ◽  
pp. 608-612
Author(s):  
Hai Bo Wang ◽  
Xiu Yang ◽  
Jun Liu ◽  
Jie Chen
Keyword(s):  
Energy Management ◽  
Control Strategy ◽  
Storage System ◽  
Energy Storage System ◽  
Photovoltaic System ◽  
Super Capacitor ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Hybrid Energy Storage System ◽  
And Control

Hybrid energy storage system (HESS) including battery and super-capacitor can take advantages of both high energy density and high power density. In the stand-alone PV micro-grid, in which two buck/boost bidirectional converters are connected to the DC bus directly, a novel energy management scheme is proposed. After filtering the fluctuating power of the HESS, charge and discharge currents of the battery are controlled by hysteresis control method, the super-capacitor supplies the difference of the power. To leveling off the fluctuating power output of photovoltaic system and control the voltage of the DC bus, a new control strategy applied to the bidirectional converter of the super capacitor is put forward. The feed-forward loops of input voltage, load current and output voltage are introduced to improve the response speed and stability of the system. Results of the simulation show the effectiveness of the proposed energy management and control strategy.

scholarly journals A random PWM control strategy for a three level inverter used in a grid connected photovoltaic system

2020 ◽  
Vol 11 (3) ◽  
pp. 1547
Author(s):  
Kamal Himour ◽  
K. Iffouzar
Keyword(s):  
Control Strategy ◽  
Control Structure ◽  
Active Power ◽  
Current Control ◽  
Multilevel Inverter ◽  
Photovoltaic System ◽  
Control Power ◽  
Control Signals ◽  
Simulation Results ◽  
Photovoltaic Generators

<p>The work presented in this paper is devoted to the control of a photovoltaic system connected to grid by a three level diode clamed inverter. A control structure based on three parts: dc link voltage control, power injected control and current control is proposed. In this work, the random PWM strategy is used to generate control signals for the multilevel inverter used us an interface to connect photovoltaic generators to the grid. Numerical simulations are performed using MATLAB / Simulink software, the simulation results for the proposed system indicate  the performances of the proposed control structure, minimization of harmonics by the random PWM strategy applied and injection to the grid more active power by the multilevel inverter structure.</p><p> </p>

scholarly journals Nonlinear Robust Backstepping Control for Three-Phase Grid-Connected PV Systems

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Mohamed Habib Boujmil ◽  
Afef Badis ◽  
Mohamed Nejib Mansouri
Keyword(s):  
Control Strategy ◽  
Control Structure ◽  
Control Process ◽  
Backstepping Control ◽  
Operating Conditions ◽  
Cascade Control ◽  
Control Technique ◽  
Pv System ◽  
Pv Systems ◽  
Three Phase

This paper proposes a cascade control structure for three-phase grid-connected Photovoltaic (PV) systems. The PV system consists of a PV Generator, DC/DC converter, a DC link, a DC/AC fully controlled inverter, and the main grid. For the control process, a new control strategy using nonlinear Backstepping technique is developed. This strategy comprises three targets, namely, DC/DC converter control; tight control of the DC link voltage; and delivering the desired output power to the active grid with unity power factor (PF). Moreover, the control process relies mainly on the formulation of stability based on Lyapunov functions. Maximizing the energy reproduced from a solar power generation system is investigated as well by using the Perturb and Observe (P&O) algorithm. The Energetic Macroscopic Representation (EMR) and its reverse Maximum Control Structure (MCS) are used to provide, respectively, an instantaneous average model and a cascade control structure. The robust proposed control strategy adapts well to the cascade control technique. Simulations have been conducted using Matlab/Simulink software in order to illustrate the validity and robustness of the proposed technique under different operating conditions, namely, abrupt changing weather condition, sudden parametric variations, and voltage dips, and when facing measurement uncertainties. The problem of controlling the grid-connected PV system is addressed and dealt by using the nonlinear Backstepping control.

A MODIFIED C-DUMP CONVERTER FOR PMSM MACHINE USED IN A FLYWHEEL ENERGY STORAGE SYSTEM

2014 ◽  
pp. 164-168
Author(s):  
K. GOPI ◽  
E. RAMAKRISHNA ◽  
K. NARASIMHAIAH ACHARI ◽  
G. KISHORE
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Storage System ◽  
Energy Storage System ◽  
Experimental Results ◽  
Flywheel Energy Storage ◽  
Modeling And Control ◽  
Flywheel Energy Storage System ◽  
And Control

This paper presents a modified C-dump converter for permanent magnetic synchronous (PMSM) machine used in the flywheel energy storage system. The converter can realize the energy bidirectional flowing and has the capability to recover the energy extracted from the turnoff phase of the PMSM machine. The principle of operation, modeling, and control strategy of the system has been investigated in the paper. Simulation and experimental results of the proposed system are also presented and discussed.

Microcontroller-based inverter topology integrated in PV systems

2015 ◽  
Vol 34 (1) ◽  
pp. 132-150 ◽  
Author(s):  
Mounir Bouzguenda ◽  
Tarek Selmi ◽  
Adel Gastli ◽  
Ahmed Masmoudi
Keyword(s):  
Leakage Current ◽  
Control Strategy ◽  
Design Methodology ◽  
Leakage Currents ◽  
Zero Crossing ◽  
Content Type ◽  
Pv Systems ◽  
High Conversion Ratio ◽  
Inverter Topology ◽  
Practical Implications

Purpose – The purpose of this paper is to study the problem of the leakage currents in transformerless inverter topologies. It proposes a novel topology and how important the adopted control strategy on the power quality produced by the inverter. Design/methodology/approach – The paper presents an investigation of a novel transformerless inverter topology. It adopted a control strategy in which the DC source is disconnected from the inverter when the zero vectors of the control are applied. By using such control strategy, the electrical efficiency of the whole system was improved and the leakage current was significantly reduced. Findings – The paper provides a solution to minimize the leakage current in transformerless inverter topologies. Besides, the problem of zero-crossing distortions was totally eliminated. Research limitations/implications – Because of the high conversion ratio of the boost converter, the efficiency of the whole system needs to be enhanced. Practical implications – The paper includes the experimental results of the proposed topology which are in good match with the simulation results. Originality/value – This paper identifies a need to study the leakage current phenomena in transformerless inverter topologies.

scholarly journals Extremum Seeking for Wind and Solar Energy Applications

2014 ◽  
Vol 136 (03) ◽  
pp. S13-S21 ◽  
Author(s):  
Azad Ghaffari ◽  
Miroslav Krstic ◽  
Sridhar Seshagiri
Keyword(s):  
Solar Energy ◽  
Experimental Results ◽  
Photovoltaic System ◽  
Extremum Seeking ◽  
Attractive Alternative ◽  
Optimization Approach ◽  
Energy Applications ◽  
Pv Systems ◽  
Model Free ◽  
Point Tracking

This paper explores the advantages of extremum seeking (ES) for wind and solar energy applications. The experimental results are also provided for the photovoltaic system. ES is an attractive alternative to perturb and observe (P&O) techniques for solving maximum power point tracking (MPPT) problems in wind and solar systems. As a model-free, real-time optimization approach, ES is well suited for systems with unknown dynamics or those that are affected by high levels of uncertainty or external dynamics, like wind turbines (WT) and PV systems. ES has the dual benefit of rigorously provable convergence and the simplicity of hardware implementation. In addition to a probing signal, the ES algorithm employs only an integrator, as well as optional high-pass and a low-pass filters. Finally, multivariable MPPT based on ES for PV systems are presented, and the validity of the proposed algorithms with experimental results are verified. Experimental results verify the effectiveness of the Newton-based MPPT versus its scalar and multivariable gradient-based counterparts.

scholarly journals A Novel Adaptive Neural MPPT Algorithm for Photovoltaic System

2018 ◽  
Vol 15 (3) ◽  
pp. 5421-5434 ◽  
Author(s):  
S. A. Allahyari ◽  
Nasser Taheri ◽  
M. Zadehbagheri ◽  
Z. Rahimkhani
Keyword(s):  
Back Propagation ◽  
Photovoltaic System ◽  
Back Propagation Algorithm ◽  
Pv System ◽  
Maximum Power Point ◽  
Pv Systems ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point ◽  
And Control

This paper presents a novel adaptive neural network (ANN) for maximum power point tracking (MPPT) in photovoltaic (PV) systems under variable working conditions. The ANN-based MPPT model includes two separate NNs for PV system identification and control. NNs are trained by using of a novel back propagation algorithm in pre/post control phases. Because of online optimal performance of NNs, the proposed method, not only overcome the common drawbacks of the conventional MPPT methods, but also gives a simple and a robust MPPT scheme. Simulation results, which carried on MATLAB, show that proposed controller is the most effective in comparison with conventional MPPT approaches.

scholarly journals Leakage Current Mitigation of Photovoltaic System Using Optimized Predictive Control for Improved Efficiency

2022 ◽  
Vol 12 (2) ◽  
pp. 643
Author(s):  
Abhinandan Routray ◽  
Sung-Ho Hur
Keyword(s):  
Leakage Current ◽  
Predictive Control ◽  
Dynamic Performance ◽  
Photovoltaic System ◽  
Pv System ◽  
Pv Systems ◽  
Common Mode Voltage ◽  
Control Scheme ◽  
Pv Modules ◽  
Experimental Laboratory

This paper proposes an optimized predictive control strategy to mitigate the potential leakage current of grid-tied photovoltaic (PV) systems to improve the lifespans of PV modules. In this work, the PV system is controlled with an optimized predictive control algorithm that selects the switching voltage vectors intelligently to reduce the number of computational burdens. Thus, it improves the dynamic performance of the overall system. This is achieved through a specific cost function that minimizes the change in common-mode voltage generated by the parasitic capacitance of PV modules. The proposed controller does not require any additional modulation schemes. Normalization techniques and weighting factors are incorporated to obtain improved results. The steady state and dynamic performance of the proposed control scheme is validated in this work through simulations and a 600 W experimental laboratory prototype.

scholarly journals Selection and Validation of Mathematical Models of Power Converters using Rapid Modeling and Control Prototyping Methods

2018 ◽  
Vol 8 (3) ◽  
pp. 1551 ◽  
Author(s):  
Fredy Edimer Hoyos ◽  
John Edwin Candelo ◽  
John Alexander Taborda
Keyword(s):  
Power Converters ◽  
Experimental Tests ◽  
Power Converter ◽  
Buck Converter ◽  
Experimental Results ◽  
Mathematical Representation ◽  
Modeling And Control ◽  
Rapid Control Prototyping ◽  
The Stability ◽  
And Control

This paper presents a methodology based on two interrelated rapid prototyping processes in order to find the best correspondence between theoretical, simulated, and experimental results of a power converter controlled by a digital PWM. The method supplements rapid control prototyping (RCP) with effective math tools to quickly select and validate models of a controlled system. We show stability analysis of the classical and two modified buck converter models controlled by zero average dynamics (ZAD) and fixed-point induction control (FPIC). The methodology consists of obtaining the mathematical representation of power converters with the controllers and the Lyapunov Exponents (LEs). Besides, the theoretical results are compared with the simulated and experimental results by means of one- and two-parameter bifurcation diagrams. The responses of the three models are compared by changing the parameter K_s of the ZAD and the parameter N of the FPIC. The results show that the stability zones, periodic orbits, periodic bands, and chaos are obtained for the three models, finding more similarities between theoretical, simulated, and experimental tests with the third model of the buck converter with ZAD and FPIC as it considers more parameters related to the losses in different elements of the system. Additionally, the intervals of the chaos are obtained by using the LEs and validated by numerical and experimental tests

scholarly journals Comparison between two types of control strategies for the coronavirus disease 2019 pandemic

2020 ◽  
Vol 14 (07) ◽  
pp. 696-698
Author(s):  
Xiaoyan Zhang ◽  
Yuxuan Wang
Keyword(s):  
Comparative Analysis ◽  
Severe Acute Respiratory Syndrome ◽  
Control Strategy ◽  
Prevention And Control ◽  
Control Strategies ◽  
Influenza Pandemic ◽  
Control Measures ◽  
Effective Control ◽  
Epidemic Control ◽  
And Control

Different countries have employed various strategies for controlling the coronavirus disease (COVID-19) pandemic because there is no consensus regarding effective control measures in the literature. Epidemic control strategies can be classified into two types based on their characteristics. The first type is the “severe acute respiratory syndrome (SARS)-like epidemic control strategy,” i.e., containment. The second type is the “influenza pandemic-like epidemic control strategy” (flu pandemic-like strategy), i.e., mitigation. This paper presents a comparative analysis on the prevention and control strategies for COVID-19 in different countries to provide a reference to control the further spread of the pandemic.

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