An adaptive proportional resonant controller for single phase PV grid connected inverter based on band-pass filter technique

Khalfalla, Hamza; Ethni, Salaheddine; Al‐Greer, Maher; Pickert, Volker; Armstrong, Matthew; Phan, Van Thang

doi:10.1109/cpe.2017.7915211

Cited by 16 publications

(14 citation statements)

References 17 publications

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“…The adaptive technique can be used in a number of different applications employing a PI controller, which represents a good platform to test the proposed adaptive control scheme. Similarly, it can be applied in alternative control structures; for example, the proportionalresonant (PR) controller which is gaining some popularity in the grid-connected renewable applications [26][27][28][29]. LabView ® was used for real-time high-level control of the DSP via an RS232 serial interface.…”

Section: Resultsmentioning

confidence: 99%

Adaptive control technique for suppression of resonance in grid‐connected PV inverters

Goh

Armstrong

Zahawi

2019

IET Power Electronics

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Grid operating conditions have a significant effect on the harmonic and resonant performance of grid-connected photovoltaic (PV) inverters and changes in grid impedance can cause a notable change in the resonant excitation between the PV inverter and the grid. This study proposes an adaptive control algorithm for grid-connected PV inverters to suppress the resonance condition excited by grid inductance variation, resulting from the dynamic changes in the operating conditions of the distribution network. The causes of resonance between grid-connected PV inverters and the distribution grid are discussed and the design of an active band-pass filter for capturing resonance is described. The proportional gain within the proportionalintegral controller is then adaptively controlled in real time to compensate for changes in the grid impedance and suppress resonant excitation while maintaining excellent low-order harmonic performance compared with alternative fixed gain controller techniques, particularly for systems with high values of grid inductance. The performance of the proposed controller is experimentally verified using a 240 V, 2 kVA single-phase grid-connected inverter.

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Section: Resultsmentioning

confidence: 99%

Adaptive control technique for suppression of resonance in grid‐connected PV inverters

Goh

Armstrong

Zahawi

2019

IET Power Electronics

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“…Having obtained the first equation of state from the law of nodes applied to the system, the process for obtaining the second equation of state will now be started based on the law of meshes, given by Equation (11).…”

Section: State Space Modelling Of Der Systemmentioning

confidence: 99%

“…However, in [8], the authors proposed an optimization tuning of the RCs controller. An adaptive PR controller was proposed in [11] to ensure a current tracking under grid parameter variations. The authors used a fourth order filter with the adaptive RC to estimate online the resonance frequency, and then the grid impedance variations.…”

Section: Introductionmentioning

confidence: 99%

Robust Resonant Controllers for Distributed Energy Resources in Microgrids

et al. 2020

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Motivated by the problem of different types and variations of load in micro-grids, this paper presents robust proportional-resonant controllers with a harmonics compensator based on the internal model principle. These controllers ensure robust tracking of sinusoidal reference signals in distributed energy resource systems subject to load variation with respect to sinusoidal disturbances. The distributed generation resource and the resonant controllers are described using the augmented state system approach, allowing the application of the state feedback technique. In order to minimize the tracking error and ensure robustness against perturbation, a set of linear matrix inequalities (LMIs) are addressed for the synthesizing of controller gains. Finally, results obtained in the simulation for resonant compensators with the distributed energy system are presented, in which the controller is applied to the CC-CA inverter.

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“…( ) provides infinite gain at frequency 0 with greater attenuation at high frequencies [21], [22]. A first order low-pass filter ( ) ( /( + )), where is the cut-off frequency, and averaging, ( ), is then applied to further eliminate the high- Based on (16), the s-domain representation of the averaging can be derived as (17).…”

Section: A Analysis Of Frequency Response Of Extractionmentioning

confidence: 99%

DC Injection Suppression in Transformer-Less Grid-Connected Inverter using a DC-Link Current Sensing and Active Control Approach

Zhang

Armstrong

Elgendy

2019

IEEE Trans. Energy Convers.

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There is increasing interest in the use of transformer-less systems for grid connected photovoltaic applications. Compared to transformer coupled solutions, transformer-less systems offer a typical efficiency increase of 1-2%, reduced system size and weight, and a reduction in cost. However, the removal of the transformer has technical implications. In addition to the loss of galvanic isolation, dc current injection into the grid is a potential risk. Whilst desirable, complete mitigation of dc current injection via convention current control methods is known to be particularly challenging. For this reason, this paper proposes an active dc suppression method, in which the dc current injection is accurately determined by extracting the line frequency component from inverter dc link current measurements and then mitigated with an active closed loop controller. Experimental results from a laboratory grid connected inverter system are presented to demonstrate the high performance of the proposed technique.

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An adaptive proportional resonant controller for single phase PV grid connected inverter based on band-pass filter technique

Cited by 16 publications

References 17 publications

Adaptive control technique for suppression of resonance in grid‐connected PV inverters

Adaptive control technique for suppression of resonance in grid‐connected PV inverters

Robust Resonant Controllers for Distributed Energy Resources in Microgrids

DC Injection Suppression in Transformer-Less Grid-Connected Inverter using a DC-Link Current Sensing and Active Control Approach

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