A modified direct power control strategy allowing the connection of three-phase inverter to the grid through LCL filters

Serpa, L.A.; Kolar, J.W.; Ponnaluri, S.; Barbosa, Peter

doi:10.1109/ias.2005.1518363

Cited by 31 publications

(30 citation statements)

References 9 publications

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“…One of the control schemes that is traditionally preferred for its robust response during faults and its high energy quality is the hysteresis controller [6]. The connection of this kind of controller through higher order grid filters such as LCL structures, that would improve the related THD, has not received great attraction in the literature [7] [8]. Experimental testing indicates that the influence of the grid in this configuration is not negligible and can introduce quality and even stability issues.…”

Section: Introductionmentioning

confidence: 97%

Influence analysis of the effects of an inductive-resistive weak grid over L and LCL filter current hysteresis controllers

Cobreces

Bueno

Rodríguez

et al. 2007

2007 European Conference on Power Electronics and Applications

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The objective of this paper is to analyse the influence of a non-ideal grid over hysteresis controllers of\ud converters connected to the grid through both L and LCL filters. The paper will describe the different\ud possible configurations in both cases, analysing the effect of a general R-L grid. Limit values for both\ud grid inductance and resistance are given for the L structure. In the case of LCL connection, the analysis\ud will overview important issues such as active damping, and switching behaviour giving limits to stability\ud as a function of grid impedance value.Postprint (author’s final draft

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Section: Introductionmentioning

confidence: 97%

Influence analysis of the effects of an inductive-resistive weak grid over L and LCL filter current hysteresis controllers

Cobreces

Bueno

Rodríguez

et al. 2007

2007 European Conference on Power Electronics and Applications

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“…The DPC strategy has been used in [13,98,104,105]. The DPC is based on the Direct Torque Control (DTC) which has been used in controlling the motor regarding the rotating ux.…”

Section: Power Control Technique At the Invertermentioning

confidence: 99%

Energy recovery from landing aircraft

Zulkifli¹

2012

2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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Currently, renewable energy sources are the main driver for future electricity generation. This trend is growing faster in the developed countries in order to reduce the green house e ect and also in response to the limited supply of oil, gas and coal which are currently the major sources for electric generation. For example, the main renewable energy sources are from wind energy and solar energy but these energies are only available to those countries that are exposed to these resources. In this thesis an alternative energy source is investigated where it can be generated from the moving objects or in form of kinetic energy. The idea is to convert the kinetic energy during landing aircraft into electrical energy which it can also be stored and transferred to the existing electrical network. To convert this kinetic energy to electrical energy, the linear generator (LG) and uncontrolled recti er have been used for energy conversion. The LG have been modelled in 3-phase model or in dq model and combined with the diode recti er that is used to generate the dc signal outputs. Due to the uncontrolled recti er the electrical outputs will have decaying amplitude along the landing time. This condition also happen to the LG outputs such as the force and the power output. In order to control these outputs the cascaded buck-boost converter has been used. This converter is responsible to control the output current at the recti er and also the LG output power during landing to more controllable power output. Here, the H ∞ current control strategy has been used as it o ers a very good performance for current tracking and to increase the robustness of the controller. During landing huge power is produced at the beginning and when the landing time is increased, the generated input power from LG is reduced to zero. Due to this, the energy storage that consits of ultracapacitor, bidirectional converter and boost converter are usedin order to store and to release the energy depends on the input power source and load grid power. The voltage proportional-integral (PI) control strategy has been used for both the converters. The last part is to transfer the energy from the source and at the ultracapacitor to the load by using the inverter as the processing device. The power controller and current controller are used at the inverter in order to control the power ow between the inverter and the grid. This is when the reference power is determined from the load power in order to generate the reference current by using the voltage oriented controller (VOC), while the H ∞ current controller is used to regulate the inverter current in order to inject the suitable amount of current that refer to the load power. Finally, a complete energy recovery system for landing aircraft with the grid connection have been put together to make the whole system to be as a new renewable energy source for the future electricity generation.

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“…In order to reduce these inductance values, [7] and [8] propose to connect the power converter through a LCL filter. This solution has the drawback of the filter resonance so has to be well studied.…”

Section: Optimized Ors Using Proportional Controllersmentioning

confidence: 99%

Optimized Direct Power Control Strategy using Output Regulation Subspaces and Pulse Width Modulation

Vázquez

Leon

Sánchez

et al. 2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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-In this paper, a Direct Power Control (DPC) using Output Regulation Subspaces (ORS) for a three-phase two-level converter is presented. An optimal controller design and the use of optimized modulation techniques permit to improve the system performance minimizing the necessary grid-connection inductance. ORS plus proportional controllers are proposed for the generation of the reference vector to decrease active and reactive power errors and to achieve unity power factor. The generation of the reference vector is carried out thanks to simple Pulse Width Modulation techniques. The computational cost of the proposed control is really low and all the calculations can be done online allowing its implementation in low cost microprocessors. Simulation and experimental results are shown in order to illustrate the good performance of the proposed control strategy.

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A modified direct power control strategy allowing the connection of three-phase inverter to the grid through LCL filters

Cited by 31 publications

References 9 publications

Influence analysis of the effects of an inductive-resistive weak grid over L and LCL filter current hysteresis controllers

Influence analysis of the effects of an inductive-resistive weak grid over L and LCL filter current hysteresis controllers

Energy recovery from landing aircraft

Optimized Direct Power Control Strategy using Output Regulation Subspaces and Pulse Width Modulation

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