IJERT-Wind Energy Conversion System Performance Is Improved Using Integrated Multilevel Converter (original) (raw)
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IJERT-Voltage Regulated Five Level Inverter Fed Wind Energy Conversion System using PMSG
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/voltage-regulated-five-level-inverter-fed-wind-energy-conversion-system-using-pmsg https://www.ijert.org/research/voltage-regulated-five-level-inverter-fed-wind-energy-conversion-system-using-pmsg-IJERTV4IS080579.pdf This paper deals with simulation of a wind energy conversion (WEC) system with vector controlled Three level inverter. Mechanical to electrical energy conversion is done by using a permanent magnet synchronous generator. Presence of five level inverter reduces the Total Harmonic Distortion component and increases the efficiency of the system. The main requirement for a grid connected system is grid interaction. The voltage regulator provided in the system is for meeting the grid requirement.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/an-advanced-full-bridge-three-level-dc-dc-converter-with-voltage-balancing-control-technique-for-wind-power-systems https://www.ijert.org/research/an-advanced-full-bridge-three-level-dc-dc-converter-with-voltage-balancing-control-technique-for-wind-power-systems-IJERTV3IS080933.pdf This paper presents an advanced full-bridge three level DC-DC converter and its control for wind power systems. A passive filter is used to improve the performance of the proposed converter. The presence of passive filter reduces the voltage stress of the medium frequency transformer in the AFBTL DC-DC converter. A modulation strategy is proposed for the AFBTC DC-DC converter, which provides two operating modes. Furthermore, a voltage balancing control of the wind turbine based on the AFBTL DC-DC converter in a DC-grid system is presented. Finally, the simulation results for the proposed AFBTL DC-DC converter with 1KW output power range is presented and obtained merely to the theoretical values. Keywords-Full bridge three level (FBTL) converter, half bridge three level (HBTL) converter, permanent magnet synchronous generator (PMSG), DC-DC converter, wind turbine, voltage balancing control, pulse width modulation (PWM). I INTRODUCTION In general, the DC grid provides advantageous things such as absence of reactive power, harmonics and power factor, which gives an effective solution for the power collection system for the growing power demand in the present days. The offshore wind turbines are mostly connected to a DC grid to deliver DC power to a medium or high DC voltage networks. To minimize power delivery and the DC connection, a high efficient DC-DC converter is required. Generally, the voltage level of the DC network is much higher than the input voltage level of the DC-DC converter. For this reason, a medium frequency transformer (MFT) with a range of hundreds of hertz to several kilohertz operating frequency is used for the DC-DC converter. In addition to providing the boosted output voltage, it provides the galvanic isolation between source and grid. (1a) (1b) Girija, P.
—In this paper, a back-to-back (BTB) modular multi-level converter (MMC) is designed for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). The switching of power semiconductors of BTB-MMC is based on phase-shifted carrier pulse width modulation (PSC-PWM). Capacitor voltage balancing issue of the BTB-MMC is realized with a control system working in accordance with PSC-PWM technique. The designed PMSG based WECS is verified through case studies using PSCAD/EMTDC.
Renewable Energy, 2014
This paper proposes a system of supervision and operation of a new structure wherein a large wind farm is connected to an electrical grid. The farm is managed in such a manner that it can produce the power needed by the grid system. The supervision algorithm is used to distribute the active and reactive power references to the wind turbines proportionally. Based on the aerodynamic power and wind speed of each turbine, the active and reactive power references are produced individually. By using the vector field oriented control, each doubly fed induction generator is controlled through the rotor, which is connected to the two-level pulse width modulation converter. The close loop control is used to provide a constant DC voltage using a five-level neutral point clamped converter. The five-level neutral point clamped converter allows also the adaptation of the voltage level to the electrical grid with better resolution waveform. The analysis of the simulation results shows the effectiveness of the proposed system.
Medium voltage three-level converters for the grid connection of a multi-MW wind turbine
2009
Three-level (3L) neutral point clamped (NPC), flying capacitor (FC), and H-bridge (HB) voltage source converters (VSCs) as a grid-side full-scale medium voltage (MV) converter are modeled, controlled, and simulated for the grid connection of a hypothetical 6MW wind turbine. Via the converter topological features and the simulation results demonstrating the converter performance, these three 3L-VSCs are discussed and compared in terms of power density and reliability, which can be considered as two of the most important criteria for the converters placed in wind turbine nacelles. Given the grid connection circuit (without capacitive switching ripple filters), the 3L-HB-VSC is expected to be superior with respect to power density and reliability over the 3L-NPC-and-FC-VSCs.
This paper thinks about the modeling switching strategy and control conspire for impartial point clamped converter sustained into matrix. Design and Analysis of PWM 3– level inverter for power quality mix of wind power in to network to interface with the medium voltage framework. Inverters are arranged into single level inverter and multi-level converter. Multi-level converter has a ton of favorable position to single level inverters have least harmonic twisting, lessened EMI/RFI creation and keep running on very surprising voltage levels. Multi-level inverter is utilized for a few mechanical applications, for example, power filters, static var compensators and drives applications. The disadvantages are the disconnected power supplies required for every last one of the phases of the multi-level converter and costlier, extreme to oversee in programming. This venture goes for the reproduction investigation of 3-ɸ single level and multi-level convertor. The part of convertor in dynamic power channel for harmonic elimination is considered and reproduced in MATLAB/SIMULINK. Right off the bat, the 3-ɸ framework with non-straight loads is demonstrated and their trademark is resolved. Also, the dynamic power filters are making with the convertor and fitting switch regulation technique (PWM technique) to hold out harmonic elimination.
Comparison of Two Power Converter Topologies in Wind Turbine System
Energies, 2021
The article presents comprehensive results of research on two representative topologies of converters used in the path of processing energy generated in a wind turbine and transmitted to the grid. The topology T1 uses a two-level transistor-controlled rectifier as a converter from the generator side, while the T2 topology uses DC/DC boost converter. In both topologies, a three-level back-to-back converter with a line filter L was used as a grid converter. The conclusions indicate the tendency of changes in power losses depending on the aforementioned parameters and can be used at the stage of deciding on the choice of topology, operating parameters or selection of control methods depending on the specific operating conditions of the wind turbine.
Integration of wind energy sources into the distribution grid affects the voltage profile that could be stabilized through the grid reinforcement or limiting the active power injection. This paper presents a control strategy to regulate the voltage at point of common coupling (PCC) through reactive power exchange to the grid. The reactive power capability of the grid-connected hybrid multilevel converter is based on the voltage sensitivity of the distribution grid at PCC. A hybrid five-level multilevel converter referred as flying capacitor (FC) based active-neutral-point-clamped (ANPC) converter is considered. It is an arrangement of a three-level ANPC converter and a two-level cell. Also, a control strategy is proposed to regulate the FCs voltages of the gridconnected hybrid multilevel converter at their required values. The proposed FC control strategy provides extra freedom to regulate the dc-link capacitor voltages with dc-offset injection technique. Simulation studies demonstrate the performance of the proposed control strategies for the system considered.
Comparative study of two PWM control wind system based on DFIG and multilevel NPC inverter
2019
The present paper is a comparative study of two supplying modes of a wind energy conversion system (WECS) based on Doubly Fed Induction Generator (DFIG). This work is conducted with a multi-level neutral-point inverter (NPC) supplying a DFIG. The first method based on conventional pulse width modulation (PWM) while the second is based on space vector modulation (SVM). This work aimed to control active and reactive power delivered to the electrical networks and satisfying the distribution requirements. The performance evaluation of each method is performed using spectral analysis to calculate total harmonic distortion (THD). Simulation results have showed that the harmonic rate (THD) is reduced. Therefore; the quality of the produced power by this type of wind chain is efficient. The results obtained with SVM have revealed that this technique uses inverter DC bus voltage more efficiently, reduces power losses and minimizes torque ripples. Keywords: DFIG, NPC, Multilevel, PWM, THD, Po...
Grid-Connection Control and Simulation of PMSG Wind Power System Based on Multi-Level NPC Converter
This dissertation proposes a wind energy conversion system is composed of a wind turbine PMSG, a rectifier, and an inverter. The wind turbine PMSG transforms the mechanical power from the wind into the electrical power, while the rectifier converts the AC power into DC power and controls the speed of the PMSG. The controllable inverter helps in converting the DC power to variable frequency and magnitude AC power. With the voltage oriented control, the inverter also possesses the ability to control the active and reactive powers injected into the grid. Multilevel inerter is used to step up the voltage and to reduce the THD. Here nine level and eleven level inverter are used and the voltage increases and THD reduces from 12.87 % to 7.46 %. Active and reactive power is controlled dc stabilization and the reactive power is near to unity Here PI controller is used to control the inverter output rms voltage and LC filter is used to remove the harmonics available in the system.