scholarly journals Modelling and Control Design for Energy Management of Grid Connected Hybrid PV-wind System

2018 ◽  
Vol 7 (2) ◽  
pp. 166
Author(s):  
Hassan Abouobaida ◽  
Said El Bied
Keyword(s):  
Internal Control ◽  
Reactive Power ◽  
Power Conversion ◽  
Maximum Power ◽  
External Control ◽  
Voltage Reference ◽  
Control Loop ◽  
Control Approach ◽  
Dc Bus ◽  
Bus Voltage

<p class="MsoNormal" style="margin-right: -14.15pt; text-align: justify; text-justify: inter-ideograph;">This paper deals with the control of hybrid PV-WIND power conversion structure. This paper develops a very important contribution which is the use of a single DC to DC converter, linearization of control of the three- level boost converter (TLBC) considering the imperfections of the passive components. The (TLBC) control provides balancing of capacitor voltages and maximum power operation of PV generator. For reasons of simplicity, a linearization based on the dynamic compensation of the disturbance is proposed. A sensorless maximum power point tracking (MPPT) algorithm is used to maximize a power extracted of the wind generator. The proportional relation between the rotational speed and the output voltage of the rectifier allows to use a voltage sensor to estimate the DC bus voltage reference instead of a mechanical speed sensor. The control of the three-phase inverter allows a transfer of the active power, the power factor close to the unit and thus a limitation of the reactive power injected into the grid. The external control loop performs the regulation of the common DC bus voltage while the internal control loop regulates the dq components of the currents injected into the grid. The simulation results showed the validity of the control approach. The proposed power conversion structure based on a single static converter has shown very good performance in terms of efficiency, the quality of the energy produced, complementarity between the two renewable sources and reliability. The paper ends with conclusions.</p>

scholarly journals Multi-Resonant based Output Voltage Control of Autonomous Distributed Generators

2018 ◽  
Vol 64 ◽  
pp. 07004
Author(s):  
Saim Abdelhakim ◽  
Mellah Rabah ◽  
Houari Azeddine
Keyword(s):  
Internal Control ◽  
Harmonic Distortion ◽  
International Standards ◽  
External Control ◽  
Voltage Reference ◽  
Control Loop ◽  
Supply Networks ◽  
Control Loops ◽  
Decentralized Generation ◽  
Asymptotic Tracking

The distributed or decentralized generation electricity constitutes the central stone of various recent energy models, such as the intelligent electrical supply networks. The quality of energy in this type of structure depends primarily on the strategy of control adopted, in order to guarantee proper operation according to the international standards. The strategy of control proposed in this paper uses two control loops. An internal control loop aims at deadening the phenomena of resonance while ensuring the required control dynamic for fast disturbance rejection. As for the external control loop, a multi-resonant composed of a stabilizing state feedback that ensure an asymptotic tracking of the voltage reference with a weak rate of harmonic distortion. Finally, experimental results are presented to show the performances and feasibility of the proposed control strategy.

scholarly journals Control and Validation of a Reinforced Power Conversion System for Upcoming Bioelectrochemical Power to Gas Stations

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1470
Author(s):  
Mahdi Shahparasti ◽  
Amirhossein Rajaei ◽  
Andres Tarraso ◽  
Jose David Vidal Leon Romay ◽  
Alvaro Luna
Keyword(s):  
Energy Storage ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Electrical Network ◽  
External Control ◽  
Gas Stations ◽  
Current Reference ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power To Gas

This paper presents a proposal for potential bioelectrochemical power to gas stations. It consists of a two-level voltage source converter interfacing the electrical grid on the AC side and an electromethanogenesis based bioelectrochemical system (EMG-BES) working as a stacked module on the DC side. The proposed system converts CO2 and electrical energy into methane, using wastewater as the additional chemical energy input. This energy storage system can contribute to dampening the variability of renewables in the electrical network, provide even flexibility and grid services by controlling the active and reactive power exchanged and is an interesting alternative technology in the market of energy storage for big energy applications. The big challenge for controlling this system lays in the fact that the DC bus voltage of the converter has to be changed in order to regulate the exchanged active power with the grid. This paper presents a cascade approach to control such a system by means of combining external control loops with fast inner loops. The outer power loop, with a proportional-integral (PI) controller with special limitation values and anti-windup capability, is used to generate DC bus voltage reference. An intermediate loop is used for DC bus voltage regulation and current reference generation. A new proportional resonant controller is used to track the current reference. The proposed scheme has been validated through real-time simulation in OPAL OP4510.

Interval Type 2 Fuzzy-Logic-Based Solar Power MPPT Algorithm Connected to AC Grid

2020 ◽  
Vol 9 (1) ◽  
pp. 110-121
Author(s):  
Amel Abbadi ◽  
Fethia Hamidia ◽  
Abdelkader Morsli ◽  
Habiba Bellatrache ◽  
Djamel Boukhetala ◽  
...  
Keyword(s):  
Fuzzy Logic ◽  
Internal Control ◽  
Boost Converter ◽  
Voltage Source ◽  
External Control ◽  
Control Loop ◽  
Photovoltaic Array ◽  
Three Phase ◽  
Interval Type

In this article, an interval type-2 fuzzy logic controller (IT2FLC) is used as a Maximum Power Point Tracker (MPPT) to supply a large scale interconnected grid. The IT2FLC has the advantage of being able to regulate the MPP in case of severe variations of the weather conditions. A photovoltaic array is connected to AC grid via a DC-DC boost converter and a three-phase three-level Voltage Source Converter (VSC). The duty cycle of the boost converter is switched by the IT2FLC. A three phase VSC converts the VDC link voltage to AC and keeps unity power factor. The VSC control system uses two control loops: an external control loop which regulates DC link voltage to alternative current and an internal control loop which regulates the active and the reactive grid currents. Vd and Vq voltage outputs of the current controller are converted to three modulating signals used by the PWM Generator.

Power balancing in islanded microgrids by using a dc-bus voltage reference

SPEEDAM 2010 ◽  
2010 ◽  
Author(s):  
Tine L. Vando ◽  
Bert Renders ◽  
Lieven Degroote ◽  
Bart Meersman ◽  
Lieven Vandevelde
Keyword(s):  
Voltage Reference ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Balancing

scholarly journals A comprehensive review of distributed power system architecture for telecom and datacenter applications

2021 ◽  
Vol 12 (3) ◽  
pp. 1535
Author(s):  
Ramesh B. Darla ◽  
Chitra A
Keyword(s):  
Power Distribution ◽  
Power Conversion ◽  
Power Losses ◽  
Voltage Level ◽  
Information And Communication ◽  
Converter Topologies ◽  
Dc Bus ◽  
Bus Voltage ◽  
And Control ◽  
Bus Architecture

With the dominating utility of the internet, it becomes critical to manage the efficiency and reliability of telecom and datacenter, as the power consumption of the involved equipment also increases. Much power being wasted through the power conversion stages by converting AC voltage to DC voltage and then stepping down to lower voltages to connect to information and communication technology (ICT) equipment. 48/12 VDC is the standard DC bus architecture to serve the end utility equipment. This voltage level is further processed to multiple lower voltages to power up the internal auxiliary circuits. Power losses are involved when it is converted from higher voltage to lower voltages. Therefore, the efficiency of power conversion is lower. There is a need to increase the efficiency by minimizing the power losses which occur due to the conversion stages. Different methods are available to increase the efficiency of a system by optimizing the converter topologies, semiconductor materials and control methods. There is another possibility of increasing the efficiency by changing the architecture of a system by increasing the DC bus voltage to higher voltages to optimize the losses. This paper presents a review of available high voltage options for telecom power distribution and developments, implementations and challenges across the world.

scholarly journals An Enhanced DC-Bus Voltage-Control Loop for Single-Phase Grid-Connected DC/AC Converters

2019 ◽  
Vol 34 (6) ◽  
pp. 5819-5829 ◽  
Author(s):  
Seyedfoad Taghizadeh ◽  
M. Jahangir Hossain ◽  
Junwei Lu ◽  
Masoud Karimi-Ghartemani
Keyword(s):  
Single Phase ◽  
Voltage Control ◽  
Control Loop ◽  
Dc Bus ◽  
Bus Voltage ◽  
Ac Converters

Enhanced Zeta Converter for DC Bus Voltage Regulation

2017 ◽  
Vol 8 (4) ◽  
pp. 1503
Author(s):  
P. Suresh ◽  
D. Kirubakaran
Keyword(s):  
Voltage Regulation ◽  
Maximum Power ◽  
Photovoltaic System ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
High Voltage Gain ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

In this paper, an Enhanced Zeta Converter (EZC) along with a high voltage gain converter is presented for DC Bus voltage regulation. The enhanced zeta converter consists of capacitors connected in parallel with the conventional zeta structure. The proposed zeta converter is applied to the Photo Voltaic system (PV) The well known Maximum Power Point Tracking (MPPT)     P &amp; O algorithm is used to extract maximum power from the photovoltaic system. The increased voltage is obtained with reduced number of switches using the proposed structure. The results to the proposed structure are compared with the conventional topology. The proposed converter is simulated using MATLAB and the same is verified with the hardware.

scholarly journals Nonlinear control strategy of single-phase unified power flow controller

2021 ◽  
Vol 11 (4) ◽  
pp. 2864
Author(s):  
Younes Abouelmahjoub ◽  
Mohamed Moutchou
Keyword(s):  
Nonlinear Control ◽  
Control Strategy ◽  
Power Flow ◽  
Single Phase ◽  
Reactive Power ◽  
Unified Power Flow Controller ◽  
Current Harmonics ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Flow Controller

In this work we propose a nonlinear control strategy of single-phase unified power flow controller (UPFC), using in order to enhance energy quality parameters of a perturbed single-phase power grid supplying nonlinear loads. The control objectives are: i) The current harmonics and the reactive power compensation, that ensure a satisfactory power factor correction (PFC) at the point of common coupling (PCC); ii) compensation of the voltage perturbations (harmonics and sags of voltage) in order to ensure the desired level, of load voltage, without distortion; iii) DC bus voltage regulation. The considered control problem entails several difficulties including the high system dimension and the strong system nonlinearity. The problem is dealt with by designing a nonlinear controller with structure including three control loops. The inner-loop regulator is designed using the Lyapunov technique to compensate the current harmonics and reactive power. The intermediary-loop regulator is designed using the Backstepping technique to compensate the voltage perturbations. The outer-loop regulator is designed using a linear PI to regulate the DC bus voltage. The control stability is proved theoretically and through simulations, these latter show the effectiveness and strong robustness of the proposed control, and prove that the above-mentioned objectives are achieved.

Sign in / Sign up

Export Citation Format

Share Document