Search query: three phase grid connect inverter

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abstract: In this paper, a four power semiconductor switch based three phase inverter is proposed for renewable energy source integration to a generalized microgrid system. The proposed topology b 4 of three phase inverter is investigated to make the commercial microgrid system to be cost effective and hardware optimized. A simple sine pulse width modulation based (SPWM) control strategy is proposed for the b 4 inverter topology instead of the traditional complex four switch based space vector techniques. The overall control structure is implemented using the Lyapunov function based nonlinear controller to track the inverter current directly in the a b c frame so that a specific amount of active and reactive grid power flow to the grid can be controlled in a decoupled manner along with low total harmonic distortion of grid currents in the presence of nonlinear load at the point of common coupling (PCC) A novel technique of using the spatial repetitive controller (SRC) is also proposed to eliminate the effect of midpoint voltage fluctuation of the dc link even in the case of asymmetrically split dc link capacitors without any extra voltage or current sensors unlike conventional methods. Detailed experimental results are provided to show the efficacy of the proposed hardware system for grid connected applications in the microgrid.
author_names: Souvik Dasgupta

Shankar Narayan Mohan

Sanjib Kumar Sahoo

Sanjib Kumar Panda
title: Application of Four Switch Based Three Phase Grid Connected Inverter to Connect Renewable Energy Source to a Generalized Unbalanced Microgrid System
venue: IEEE Transactions on Industrial Electronics
year: 2013

abstract: This paper presents modeling and control of a grid connected photovoltaic plant. The system consists of a PV cell, a Sepic DC DC converter used for Maximum Power Point Tracking (MPPT) a three phase grid converter. A nonlinear control technique of a three phase inverter is proposed to compensate unbalanced load currents. It allows full control of DC bus voltage, while controlling power flow from the PV cells to the system and guarantying balanced sinusoidal grid currents at unity power factor under varying solar irradiation. Moreover, a sliding mode control technique for a Sepic DC DC converter is used to extract the MPPT. The proposed control techniques have shown good performance. The system is validated using the "Power system Blockset" simulator under various values of the solar irradiation.
author_names: Abdelhamid Hamadi

Salem Rahmani

Kamal Al-Haddad

Yasir A Al-Turki
title: A three phase three wire grid connect photovoltaic energy source with Sepic converter to track the Maximum Power Point
venue: IECON 2011 37th Annual Conference of the IEEE Industrial Electronics Society
year: 2011

abstract: As the traditional resources have become rare, photovoltaic generation is developing quickly. The grid connected issue is one of the most importance problem in this field. The voltage source inverter usually uses LC or LCL as the filter. LCL filter, which can reduce the required filtered inductance and save the cost, is adopted to connect the grid in this paper. However, reasonable design of LCL filter needs consideration in order to achieve optimal effect. Meanwhile, systems with LCL filter need more complex control strategies. This paper firstly introduces a whole scheme of LCL filter design, then analyzes a two loop control method in detail which uses the capacitor current and grid current as the inner and outer control variable respectively. Detailed discussion about the role of the loops and the influence on the system caused by every parameter of the controller are given out. Finally experimental results verify the correctness of the analysis and availability of the control strategy.
author_names: Yun Chen

Fei Liu
title: Design and Control for Three Phase Grid Connected Photovoltaic Inverter with LCL Filter
venue: 2009 IEEE Circuits and Systems International Conference on Testing and Diagnosis
year: 2009

abstract: Now a days due to recent advances in Photovoltaic (PV) panels, the demand on solar energy is increasing. In order to commercialize utilize solar energy properly we have connect it the grid. This paper deals with the design simulation of two stage converter system for integrating PV panel with the grid. It consists of PV panel, boost dc dc converter for stepping up the PV panel voltage, a VSI for converting dc to ac finally the grid. For operating the PV panel at maximum power point, Incremental Conductance algorithm is used the system also works under various changing environmental conditions. For controlling inverter output with respect to grid synchronous reference (dq) frame control is used. Three phase PLL is used to lock grid frequency phase with respect to inverter output. A low pass LC filter is modeled to remove high frequency harmonics from the inverter output transformer is used to provide galvanic isolation between inverter output grid. All the simulations are carried out in Simulink environment of MATLAB.
author_names: P Akash Pattanaik

Naresh K Pilli

Santosh kumar Singh
title: Design, simulation performance evaluation of three phase grid connected PV panel
venue: 2015 IEEE Power, Communication and Information Technology Conference (PCITC)
year: 2015

abstract: This paper presents a Matlab/Simulink model of a 300 KW grid connected photovoltaic (PV) system. The system includes a 300 KW PV array, a maximum power point tracking boost converter using perturbation and observation (P&O) method and a grid connected inverter with its control system. An L filter is designed to smoothly connect the inverter to the utility grid. The boost converter controlled by a P&O algorithm is responsible for extracting the maximum power available to the PV array at any atmospheric conditions. The grid connected inverter is responsible for maintaining the DC link voltage constant. To accomplish the grid connected inverter task, a cascaded control structure is used; the outer control loop is the DC link voltage loop while the inner control loop is the direct axis inverter current component. A reactive power controller is used also to support the grid with a reactive power from the reserve inverter capacity. To control the reactive power transferred to the grid the quadrature axis inverter current component is controlled. A classical proportional integral (PI) and fuzzy logic controller are used to control the DC link voltage, direct axis current and quadrature axis current component. This paper also analyzes the characteristic of the power converter performance under PI control and fuzzy logic control connected to a very weak grid with minimum short circuit ratio (SCR)
author_names: Mohd Saifulizan Omar

Amgad El-Deib

Ahmad El Shafei

M A El rhman

M E Abdallah
title: Comparative study between PI and fuzzy logic controllers for three phase grid connected photovoltaic systems
venue: 2016 Eighteenth International Middle East Power Systems Conference (MEPCON)
year: 2016

abstract: A single stage three phase Photovoltaic (PV) inverter guaranteeing Maximum Power Point Tracking (MPPT) and nearly unitary Power Factor (PF) in the connection to the Low Voltage (LV) grid, while acting as an Active Power Filter (APF) is developed in this paper. A Current Source Inverter (CSI) with an inductive DC link is used to connect the PV array to the grid, and the MPPT is achieved controlling directly the power in the DC link. Based on the power balance of the whole system, the grid current references are generated in a dq frame synchronized with the grid guaranteeing the mitigation of current harmonics produced by a non linear load connected to the grid. Simulation results are presented to confirm the proper operation of the system.
author_names: Thomas Geury

Sonia Ferreira Pinto

Johan J C Gyselinck
title: Three phase power controlled PV current source inverter with incorporated active power filtering
venue: IECON 2013 39th Annual Conference of the IEEE Industrial Electronics Society
year: 2013

abstract: Single phase grid connected inverters are widely used to connect small scale distributed renewable resources to the grid. However, unlike a three phase system, control for a single phase inverter is more challenging, especially when the inverter is used with an LCL filter. This paper proposes a novel recurrent neural network based vector control method for a single phase inverter with an LCL filter. The neural network is trained based on adaptive dynamic programming principle, and the objective of the training is to approximate optimal control. The Levenberg Marquardt plus forward accumulation through time algorithm is developed for training the proposed recurrent neural network controller. The neural network vector control approach is compared with the conventional control methods, including the conventional PI based vector control method and the PR based control technique for single phase inverters. Both the simulations and hardware experiments demonstrate the great advantages of the proposed neural network vector control over the conventional control methods. Compared with conventional control methods, the neural network control allows for low sampling rate and low switching frequency, while maintaining high performance in controlling a single phase inverter. In addition, no specific damping policy is required to implement the proposed neural network vector control for an LCL filter based single phase inverter. The study shows that the neural network vector control is a robust control method, and can provide better control performance even when facing system parameter changes, while under this case, both the conventional PI based vector control and the PR based control failed to yield the acceptable results.
author_names: Xingang Fu

Shuhui Li
title: Control of Single Phase Grid Connected Converters With LCL Filters Using Recurrent Neural Network and Conventional Control Methods
venue: IEEE Transactions on Power Electronics
year: 2016

abstract: This paper describes the main inverter topologies intended to connect the renewable energy resources to the grid utility. It shows the circuit configuration of the fullbridge three phase inverter, flyback inverter, Z Source inverter and neutral point clamped inverter, and it also discusses their advantages and disadvantages for each application. At last, a list of non common topologies that handle specific issues of renewable resources is presented.
author_names: Hendriks Delesposte Paulino

P J M Menegaz

Domingos Savio Lyrio Simonetti
title: A review of the main inverter topologies applied on the integration of renewable energy resources to the grid
venue: XI Brazilian Power Electronics Conference
year: 2011

abstract: This paper describes and evaluates an adaptive neuro fuzzy inference system (ANFIS) based energy management system (EMS) of a grid connected hybrid system. It presents a wind turbine (WT) and photovoltaic (PV) solar panels as primary energy sources, and an energy storage system (ESS) based on hydrogen (fuel cell FC hydrogen tank and electrolyzer) and battery. All of the energy sources use dc/dc power converters in order to connect them to a central DC bus. An ANFIS based supervisory control system determines the power that must be generated by/stored in the hydrogen and battery, taking into account the power demanded by the grid, the available power, the hydrogen tank level and the state of charge (SOC) of the battery. Furthermore, an ANFIS based control is applied to the three phase inverter, which connects the hybrid system to grid. Otherwise, this new EMS is compared with a classical EMS composed of state based supervisory control system based on states and inverter control system based on PI controllers. Dynamic simulations demonstrate the right performance of the ANFIS based EMS for the hybrid system under study and the better performance with respect to the classical EMS.
author_names: Pablo Garcia-Trivino

Carlos Andres Garcia

Luis M Fernandez

Francisco Llorens

Francisco Jurado
title: ANFIS Based Control of a Grid Connected Hybrid System Integrating Renewable Energies, Hydrogen and Batteries
venue: IEEE Transactions on Industrial Informatics
year: 2014

abstract: The increasing use of grid connected inverters to connect renewable energy sources to a power grid will have globally important effect on grid performance. A mismatch between the grid and inverter impedance may cause harmonic resonances, which can lead to instability of the grid and disruption of inverter operation. The grid dynamics vary over time, so the inverter should adapt to the varying conditions to ensure system stability. Recent studies have presented online methods to adaptively control the grid connected inverters in the sequence domain. This paper extends those previous studies, and presents an online method to adaptively control the inverters in the dq domain. In the method, the grid impedance is measured online using a pseudo random binary sequence (PRBS) injection and Fourier techniques. The inverter control parameters are then adaptively adjusted based on the measurements. This paper presents experimental results based on a three phase photovoltaic inverter using power hardware in the loop (PHIL) setup.
author_names: Roni Luhtala

Tuomas Messo

Tommi Reinikka

Jussi Sihvo

Tomi Roinila

Matti K Vilkko
title: Adaptive control of grid connected inverters based on real time measurements of grid impedance: DQ domain approach
venue: 2017 IEEE Energy Conversion Congress and Exposition (ECCE)
year: 2017