Design and FPGA Implementation of a Deloading Control Technique for DC Link Voltage Regulation of a PV System

2021 ◽  
Author(s):  
Soumya Samanta ◽  
Subir Datta ◽  
Satyajit Das ◽  
Binoy Krishna Roy ◽  
Amrita Ganguly
Keyword(s):  
Voltage Regulation ◽  
Fpga Implementation ◽  
Control Technique ◽  
Pv System

scholarly journals An Advanced Control Technique for Power Quality Improvement of Grid-Tied Multilevel Inverter

2021 ◽  
Vol 13 (2) ◽  
pp. 505
Author(s):  
Sumaya Jahan ◽  
Shuvra Prokash Biswas ◽  
Md. Kamal Hosain ◽  
Md. Rabiul Islam ◽  
Safa Haq ◽  
...  
Keyword(s):  
Power Quality ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Control Technique ◽  
Solar Pv ◽  
Pv System ◽  
Reference Tracking ◽  
Proportional Integral ◽  
Lead Compensator ◽  
Power Quality Improvement

The use of different control techniques has become very popular for controlling the performance of grid-connected photovoltaic (PV) systems. Although the proportional-integral (PI) control technique is very popular, there are some difficulties such as less stability, slow dynamic response, low reference tracking capability, and lower output power quality in solar PV applications. In this paper, a robust, fast, and dynamic proportional-integral resonance controller with a harmonic and lead compensator (PIR + HC + LC) is proposed to control the current of a 15-level neutral-point-clamped (NPC) multilevel inverter. The proposed controlled is basically a proportional-integral resonance (PIR) controller with the feedback of a harmonic compensator and a lead compensator. The performance of the proposed controller is analyzed in a MATLAB/Simulink environment. The simulation result represents admirable performance in terms of stability, sudden load change response, fault handling capability, reference tracking capability, and total harmonic distortion (THD) than those of the existing controllers. The responses of the inverter and grid outlets under different conditions are also analyzed. The harmonic compensator decreases the lower order harmonics of grid voltage and current, and the lead compensator provides the phase lead. It is expected that the proposed controller is a dynamic aspirant in the grid-connected PV system.

scholarly journals Decentralized Voltage Regulation in Islanded DC Microgrids Based on a Modified Droop Control using Superimposed AC Voltage

2021 ◽  
Author(s):  
Mohammadreza Nabatirad ◽  
Reza Razzaghi ◽  
Behrooz Bahrani
Keyword(s):  
Control System ◽  
Load Sharing ◽  
Voltage Regulation ◽  
Control Technique ◽  
Droop Control ◽  
Dc Microgrids ◽  
Distributed Generator ◽  
Voltage Compensation ◽  
Terminal Voltage ◽  
Unit Output

The conventional droop control is a widely-used technique in load sharing among Distributed Generator (DG) units in islanded DC Microgrids (MGs). This method provides Plug-and-Play (PnP) capability for DG units; however, poor load sharing accuracy and unregulated voltage are two shortcomings of that. This article proposes a novel control system in islanded DC MGs to provide simultaneous regulated voltage and accurate load sharing. The method utilizes a modified droop control technique in a decentralized manner. The proposed control system injects a superimposed AC voltage to the network that carries a frequency proportional to the master DG unit output current. The injected voltage adjusts an added a term to the conventional droop control named as the voltage compensation term in order to cancel voltage changes. This term adjusts terminal voltage of DG units proportional to the frequency of the superimposed AC voltage. The performance of the proposed control system is validated via a set of simulation studies using PLECS, and the experimental results confirm the viability and feasibility of the proposed control system.

Adaptive Control Scheme for Grid Tied SPV System with DSTATCOM Capabilities: Review

2021 ◽  
Vol 23 (07) ◽  
pp. 678-689
Author(s):  
Bilal Ahmad Ganie ◽  
◽  
Dr. (Mrs.) Lini Mathew ◽  
Keyword(s):  
Adaptive Control ◽  
Stage Structure ◽  
Voltage Regulation ◽  
Control Technique ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Current Harmonics ◽  
Control Approach ◽  
Photovoltaic Array ◽  
Static Compensator

This study provides an adaptive control approach of VSC (voltage source converter) coupled with SPV (solar photovoltaic array), in a 3P3W (three-phase three-wire) system with three single-phase non-linear loads having Distributed Static Compensator (DSTATCOM) abilities using P and O (perturb & observe) methodology. The adaptive control technique converges quickly and has a low mean square error. For the correction of power factor and zero voltage regulation modes, the system is studied and simulated. The system’s great efficacy at high voltages is due to its one-stage structure. Grid current harmonics are significantly below the IEEE-519 norm. The suggested system is modeled and simulated with the available sim power system toolbox in MATLAB/Simulink, and the system’s behavior under different loads and environmental circumstances is confirmed.

scholarly journals Power Quality Enhancement in Grid Connected PV Systems using High Step Up DC-DC Converter

2017 ◽  
Vol 7 (2) ◽  
pp. 720
Author(s):  
V S Prasadarao K ◽  
K V Krishna Rao ◽  
P Bala Koteswara Rao ◽  
T. Abishai
Keyword(s):  
Power Quality ◽  
Fossil Fuels ◽  
Reactive Power ◽  
Neutral Current ◽  
Renewable Energy Sources ◽  
Current Control ◽  
Control Technique ◽  
Pv System ◽  
Hysteresis Current Control ◽  
Switching Losses

Renewable energy sources (RES) are gaining more importance in the present scenario due to the depletion of fossil fuels and increasing power demand. Solar energy is the one of the most promising as it is clean and easily available source. The voltage obtained from the PV system is low. This voltage is increased by high step up dc-dc converter which uses only one switch leads to low switching losses and hence the efficiency of this converter is high. To get the good response this converter is operated in closed loop manner. Integration of PV system with existing grid has so many issues like distorted voltage, current and reactive power control etc. This paper presents a four leg inverter which works on hysteresis current control technique to address the power quality issues like reactive power compensation, balanced load currents and compensation of neutral current. The switching to the inverter is designed in such a way that it supplies the extra current to stabilise the current of the grid that is being supplied to the loads. Finally, the proposed technique is validated by using mat lab/Simulink software and corresponding results are presented in this paper.

scholarly journals Development of a Digitally Controlled Inductive Power Transfer System with Post-Regulation for Variable Load Demand

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 58
Author(s):  
Kateryna Stoyka ◽  
Antonio Vitale ◽  
Massimo Costarella ◽  
Alfonso Avella ◽  
Mario Pucciarelli ◽  
...  
Keyword(s):  
Phase Shift ◽  
Output Power ◽  
Output Voltage ◽  
Voltage Regulation ◽  
Control Technique ◽  
Switching Frequency ◽  
Variable Load ◽  
Power Transfer ◽  
Inductive Power Transfer ◽  
Inductive Power

Inductive Power Transfer (IPT) is an emerging technology enabling a contactless charging process in manifold applications such as electric vehicles, wearable and portable devices, or biomedical applications. Such technology can be profitably used to develop enhanced electronic solutions in the framework of smart cities, homes and smart workplaces. This paper presents the development and realization of a series–series compensated IPT System (IPTS) followed by a post-regulator implemented by means of a DC–DC converter. Such a system is modeled through a first harmonic approximation method, and a sensitivity analysis of the IPTS performance is carried out with respect to the variations of the primary inverter switching frequency and phase-shift angle. As an element of novelty of this work, the bias points are determined which allow the efficiency maximization while ensuring system controllability. An enhanced dynamic modeling of the system is then performed by means of a coupled mode theory, including the inverter phase-shift modulation and extending its validity to whatever operating frequency. A digital control of the post-regulator is implemented by means of a commercial low-cost microcontroller enabling the output voltage regulation under both fixed and variable load conditions through a voltage mode control technique. An IPTS prototype is eventually realized, which is able to correctly perform the output voltage regulation at the desired nominal value of 12 V for static resistive loads in the range [5,24] Ω, yielding the output power in the range [6, 28.8] W and the experimental efficiencies going from 72.1% (for 24 Ω) to 91.7% (for 5 Ω). The developed system can also be effectively used to deliver up to 35 W output power to variable loads, as demonstrated during the battery charging test. Finally, an excellent output voltage regulation is ascertained for load transients between 5 Ω and 24 Ω, with limited over- and undershoot amplitudes (less than 3% of the nominal output voltage), thus enabling the use of the proposed system for both fixed and variable loads in the framework of smart homes and workplaces applications.

scholarly journals Journal Vol – 13 No -4, October 2018 Journal > Journal Vol – 13 No -4, October 2018 Approximate Solution of Strongly Forced Nonlinear Vibrating Systems Which Vary With Time admin October 24, 2018 Based on the combined work of extended Krylov-Bogoliubov-Mitropolskii method and harmonic balance (HB) method an analytical technique is presented to determine approximate solutions of nonlinear differential systems whose coefficients change slowly and periodically with time. Furthermore, a non-autonomous case also… READ MORE https://doi.org/10.26782/jmcms.2018.10.00001 Author(s): Pinakee dey, Nasir Uddin, Md Asaduzzaman, Sanjay kumar saha, M. A. Sattar Please Login To View Or Download the Paper Journal Vol – 13 No -4, October 2018 Design and Comparison of PI and Back-Stepping Control for Single Phase Two-Stage Grid Connected PV System admin October 24, 2018 In grid connected two stage PV system some Control technique are applied to get maximum power point, voltage adjustment of boost converter , inverter voltage , DC link voltage control, grid current control, power factor improvement and reduction in total… READ MORE https://doi.org/10.26782/jmcms.2018.10.00002 Author(s): Syed Qaiser Ahmad Shah, Khalid Mahmood, Syed Shafiq Ahmad Shah, Mehr-e-Munir, Muhammad Aamir Aman Please Login To View Or Download the Paper Journal Vol – 13 No -4, October 2018 On the Suitability of Peak Shape Method for the Analysis of Thermoluminescence in Different Models

2018 ◽  
Vol 13 (5) ◽  
Author(s):  
Sk Azharuddin
Keyword(s):  
Approximate Solutions ◽  
Current Control ◽  
Control Technique ◽  
Pv System ◽  
Two Stage ◽  
Analytical Technique ◽  
Control Power ◽  
Autonomous Case ◽  
Power Point ◽  
Back Stepping Control

scholarly journals A Survey on Smart Grid-Connected Photovoltaic Power Systems and Its Issues

IJOSTHE ◽  
2017 ◽  
Vol 4 (3) ◽  
pp. 6 ◽  
Author(s):  
Sarika Gautami ◽  
Rajeev Tiwari
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Power System ◽  
Distribution System ◽  
Operation Mode ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Pv System ◽  
Local Conditions ◽  
Photovoltaic Power

Photovoltaic power generation refers to the use of solar photovoltaic cells to the solar radiation can be directly transformed into electricity generation. Distributed photovoltaic power generation, refers to the construction in the vicinity of the user's location, the operation mode to the user side of spontaneous self-occupied mainly, the excess power on the Internet, and in the distribution system to balance the characteristics of the photovoltaic power generation facilities. Distributed photovoltaic power generation follow the principle of local conditions, clean and efficient, decentralized layout, the principle of the nearest use, and make full use of local solar energy resources, alternative and reduce fossil energy consumption. This paper aims to investigate and emphasize the importance of the grid-connected PV system. The investigation was conducted to critically review the literature on expected potential problems associated with issues of PV based grid system. The main purpose of this paper is to discuss the basic understanding of photovoltaic (PV) based distributed generation power system and how these power flows will influence the performance and stability of a power system. Some of the PV grid integration issues such as voltage regulation, voltage sags, harmonic distortion, etc are also discussed and possible solutions are also mentioned.

scholarly journals Maximum Power Point Tracking and Voltage Regulation of Two-Stage Grid-Tied PV System Based on Model Predictive Control

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1304 ◽  
Author(s):  
Miaomiao Ma ◽  
Xiangjie Liu ◽  
Kwang Y. Lee
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Output Voltage ◽  
Voltage Regulation ◽  
Maximum Power ◽  
Pv System ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

This paper proposes a maximum power point tracking (MPPT) and voltage regulation method based on model predictive control (MPC) for the two-stage grid-tied photovoltaic (PV) system, which can achieve MPPT and output voltage regulation of a PV system simultaneously. The MPPT algorithm based on MPC is implemented in a DC-DC boost converter. The reference voltage at maximum power point is obtained by dual step Incremental Conductance (I&C) algorithm under the rapidly varying illumination intensity, and the MPPT controller only needs to minimize one cost function of PV current, without pulse width modulation (PWM) module. To inject the generated PV power into the grid with high quality, this paper designs voltage regulation controller based on MPC to maintain the output voltage of the PV system at the desired value. The MPC controller outputs the optimal duty signal with the input and state constraints in the inner loop, and the PI controller in the outer loop is designed to improve the dynamic performance. The proposed method based on MPC was demonstrated using the SimPower systems tool in MATLAB/Simulink. Analysis and simulation results for the PV system show possible improvements on the closed-loop performance such as fast response and low overshoot.

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