scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Implementation of single-phase modified SRF-PLL using model based development approach

TL;DR: The model based development (MBD) approach on improved SRF-PLL algorithm is employed in order to automatically generate production quality code, increase productivity and shorten the development time of grid synchronisation module in grid tied inverters.
Abstract: Grid synchronisation plays a vital role in grid tied inverters where the phase, frequency and voltage amplitude of grid is a critical information. In order to extract this information accurately, an improved technique of single-phase synchronous reference frame phase locked loop (SRF-PLL) is used in grid tied inverters. This method uses a transport delay block and a changed Park transform in such a way that the overall system performs well in frequency varying and harmonically distorted grid. The purpose of this work is to employ the model based development (MBD) approach on improved SRF-PLL algorithm, in order to automatically generate production quality code, increase productivity and shorten the development time of grid synchronisation module in grid tied inverters. The efficiency of proposed development approach is verified, tested and validated using off-line MATLAB/Simulink simulation, hardware-in-loop (HIL) real time simulation, software-in-loop (SIL) simulation. Hardware implementation and simulation results show potential application of MBD applied to improved SRF-PLL in grid tied inverter for synchronisation.
Citations
More filters
Proceedings ArticleDOI
11 May 2018
TL;DR: This work is mainly aimed at analyzing phase locking techniques and comparing the performance through the simulator and three different methods of PLL are simulated using MATLAB/Simulink.
Abstract: There are different techniques for synchronized power feeding from the generator to the grid. Phase Locked Loop(PLL) is most efficient and stable for the same purpose. This work is mainly aimed at analyzing phase locking techniques and comparing the performance through the simulator. In this paper, three different methods of PLL are simulated using MATLAB/Simulink. In Power PLL(pPLL) for phase detection, multiplication is done between input-output signal. The drawback of phase lock error of pPLL is overcome by using Quadrature Signal Generator(Qsg)based PLL. In Derivative Element PLL(DE-PLL), quadrature signal for phase detection is generated using Derivative Element. In Adaptive Transfer Delay PLL (ATD-PLL) the phase error due to fixed T/4 delay is compensated by introducing phase error in a feedback loop. Mathematical analysis is done for all PLL technique to obtain controller parameters. PLLs are simulated employing these parameters. Finally, the performance of all techniques is evaluated for simulation results.

7 citations


Cites background from "Implementation of single-phase modi..."

  • ...This drawback is overcome by Adaptive Transfer Delay-PLL(ATD-PLL) by taking feedback from a change in output frequency [7] [8]....

    [...]

Proceedings ArticleDOI
01 Dec 2018
TL;DR: An amplitude adaptive notch filter based control algorithm is proposed for power quality improvement in single phase utility grid integrated to solar photovoltaic (PV) with a permanent magnet synchronous generator based wind energy generation system (WEGS).
Abstract: In this paper, an amplitude adaptive notch filter (AANF) based control algorithm is proposed for power quality improvement in single phase utility grid integrated to solar photovoltaic (PV) with a permanent magnet synchronous generator based wind energy generation system (WEGS). The AANF control is designed for extraction of fundamental component of load current. The proposed technique offers a high degree of insensitivity and immunity to power disturbances. The main objective of the system is to supply active power to the load and single phase grid connected at PCC (Point of Common Coupling) also at the same time mitigates the power quality issues like grid current harmonics distortion and load reactive power compensation. To achieve maximum power, a P&O (Perturb and Observe) based MPPT (Maximum Power Point Tracking) algorithm is used. A feed-forward term for solar and wind contribution is introduced for improving the dynamic response for the changes in solar insolation and wind speed, respectively. The implementation of the proposed control is simple and the system response is fast. The behavior of system is tested under dynamic loading, variable solar insolation and changing wind speed conditions on a developed prototype in the laboratory. The performances of the proposed system satisfy the objective the proposed scheme and the IEEE −519 standard.

6 citations


Additional excerpts

  • ...Therefore, the system robustness is compromised [9-10]....

    [...]

Proceedings ArticleDOI
01 Dec 2018
TL;DR: A self-tuning filter-frequency locked loop (STF-FLL) based control algorithm is proposed for power quality improvement in single phase utility grid integrated to solar photovoltaic array with a permanent magnet synchronous generator based wind energy generation system (WEGS).
Abstract: In this paper, a self-tuning filter-frequency locked loop (STF-FLL) based control algorithm is proposed for power quality improvement in single phase utility grid integrated to solar photovoltaic (PV) array with a permanent magnet synchronous generator (PMSG) based wind energy generation system (WEGS). The STF-FLL control is designed for effective extraction of fundamental components of load current. The proposed technique offers a high degree of insensitivity and immunity to power disturbances. The main objective of the system, is to supply active power to the load and a single phase grid, connected at point of common coupling (PCC). Moreover, it also mitigates the power quality issues like grid current harmonics distortion and provides load reactive power compensation. The grid connected voltage source converter (VSC) acts as a distribution static compensator (DSTATCOM) in the absence of power from the PV array as well as from the wind turbine and improves the power quality of the current drawn from the grid. The STF-FLL technique extracts the fundamental components of the grid voltage for grid synchronization. To achieve maximum power, a perturb and observe (P&O) based maximum power point tracking (MPPT) algorithm is used. A feed-forward term for solar and wind contribution, is introduced for improving the dynamic response for the changes in solar insolation and wind speed, respectively. The implementation of proposed control is simple and the system response is fast. The behavior of system is tested under dynamic loading, variable solar insolation and changing wind speed conditions on a developed prototype in the laboratory. The performances of proposed system satisfy the objective the proposed scheme and the IEEE-519 standard.

4 citations


Additional excerpts

  • ...Therefore, the system robustness is compromised [12-13]....

    [...]

Proceedings ArticleDOI
01 Nov 2018
TL;DR: The main objective of the system is to develop a reliable, secure and safe integration for mitigation of various power quality issues like current harmonics distortion, DC offset rejection and variable wind speed conditions.
Abstract: In this paper, a modified notch filter (MNF) based control algorithm is proposed for power quality improvement in single phase utility grid integrated wind energy generation system (WEGS) under abnormal grid conditions. A MNF based control is designed for fundamental component extraction. The main objective of the system is to develop a reliable, secure and safe integration for mitigation of various power quality issues like current harmonics distortion, DC offset rejection. The perturb and observe (P&O) based maximum power point tracking algorithm is used to achieve maximum power. For validation of the system operation, tests are conducted on a prototype developed in the laboratory under different conditions like distorted grid voltage, sag/swell and variable wind speed conditions.

3 citations


Additional excerpts

  • ...Therefore, the system robustness is compromised [8-9]....

    [...]

Proceedings ArticleDOI
19 Jun 2019
TL;DR: An I-DPAPS (Improved-Diffusion Proportionate Affine Projection Sign)based control algorithm is proposed for VSC (Voltage Source Converter), to regulate the voltage and frequency of the islanded microgrid and also improved power quality.
Abstract: This paper focuses on the voltage and frequency regulation of islanded microgrid under the sudden start of an IM (Induction Motor)load, EV (Electric Vehicle)charging, and unbalanced nonlinear load. An I-DPAPS (Improved-Diffusion Proportionate Affine Projection Sign)based control algorithm is proposed for VSC (Voltage Source Converter), to regulate the voltage and frequency of the islanded microgrid and also improved power quality. The performance of the islanded microgrid is demonstrated through simulated results obtained in the MATLAB/Simulink and test results taken from the experimental prototype realised in the laboratory.

Cites methods from "Implementation of single-phase modi..."

  • ...In the reported literature [11]-[16], various control algorithms are developed to provide the switching pulses to the VSC such as conventional SRF (Synchronous Reference Frame) [11], SOGI (Second Order Generalized) [12],ISOGI (Improved SOGI), EPLL (Enhanced Phase Locked Loop)[13] and some advanced adaptive filter based control algorithms [14]-[16]....

    [...]

References
More filters
Proceedings ArticleDOI
04 Jul 2010
TL;DR: In this article, the basic features of the PLL technique are presented and the most employed solutions for the internal filtering: Low Pass Filter, Resonant Filter, Moving Average Filter, Repetitive Controller.
Abstract: The knowledge of the phase, amplitude and frequency of the utility voltage is a fundamental aspect for the design of the grid-connected inverter systems. In this paper are presented the basic features of the PLL technique. A particular attention is dedicated to the Synchronous Reference Frame-PLL scheme. About the generation of the orthogonal voltages system an evaluation of the most employed techniques is shown: Transport Delay, Inverse Park Transformation, Hilbert Transformation, Second Order Generalized Integrators (SOGI). Moreover some problems in filtering are treated. The internal filtering - due to the PD structure - and the external filtering - due to the harmonics presence in the grid voltage. In both the cases the most employed solutions are shown. For the internal filtering: Low Pass Filter, Resonant Filter, Moving Average Filter, Repetitive Controller. For the external filtering two alternative schemes are presented: the Dual SOGI-PLL and the Enanched-PLL (EPLL).

174 citations

Proceedings ArticleDOI
21 Jul 2013
TL;DR: In this paper, an adaptive synchronous reference frame phase locked loop (ASRF-PLL) with islanding detection capability is proposed, which provides stable operation under various grid conditions and maintains stable frequency reference during islanding mode.
Abstract: Accurate detection of grid voltage phase angle under fault and distorted voltage conditions is essential for distributed generation (DG). Failure to detect supply voltage phase angle accurately will lead to frequency fluctuation, power oscillation and harmonic currents. For Microgrid applications, the synchronization mechanism should be able to detect the frequency drift during islanding mode and provide stable frequency reference for standalone operation. To realize this goal, an adaptive synchronous reference frame phase locked loop (ASRF-PLL) with islanding detection capability is proposed. A reconfigurable inverter controller that supports both gird connected and stand-alone operation modes is also proposed. This provides stable operation under various grid conditions and maintains stable frequency reference during islanding mode. Simulation results were carried out to validate the proposed PLL to synchronies the power converter link between the Microgrid with hybrid generation and the AC Grid. The proposed PLL was implemented using the dSPACE 1103. The experimental results confirm excellent performance of the proposed technique and agree with the simulation results moreover. The proposed PLL performance was compared with the conventional SRF-PLL. The results verify the validity of the proposed PLL showing its ability to maintain stable operation under various conditions.

25 citations

Proceedings ArticleDOI
15 Mar 2015
TL;DR: The generation of the orthogonal signal is achieved by the discrete Fourier transform (DFT) filter, which offers better harmonics immunity and DC component rejection capacity and makes the proposed DFT-PLL especially suitable for harmonically distorted and frequency-varying applications.
Abstract: A new single-phase synchronous reference frame phase-locked loop (SRF-PLL) is proposed in this paper. The key point to implement single-phase SRF-PLL is how to generate the orthogonal signal accurately, even under polluted grids with harmonics and DC components. In this paper, the generation of the orthogonal signal is achieved by the discrete Fourier transform (DFT) filter. Compared with conventional SRF-PLLs, the DFT-based PLL (DFT-PLL) proposed offers better harmonics immunity and DC component rejection capacity. Besides, the proposed method incorporates grid frequency variations by adjusting the sampling period of DFT according to the estimated frequency. Also, digital implementation of DFT-PLL is simple and straightforward with low computational burden. These advantages make the proposed DFT-PLL especially suitable for harmonically distorted and frequency-varying applications. Experimental results and comparisons with two another widely used SRF-PLLs are given to validate the effectiveness and advantages of the proposed method.

15 citations


"Implementation of single-phase modi..." refers background in this paper

  • ...1(b) subjected to Park transform [6] given by (2)....

    [...]

  • ...−Vβ resulting in cos(θenew) = −sin(θnew − Tg/4 + θerr) The quadrature signal thus obtained after Park transform will be [6]...

    [...]

  • ...A small change in the Park transform applied initially eliminates this drawback [6]....

    [...]

Proceedings ArticleDOI
04 Jul 2016
TL;DR: In this paper, the authors suggest some alternative and low-cost HIL setups with COTS units usually available in laboratories of academic institutions such as MATLAB, LabVIEW, PLC, RTU, SCADA to simulate and test the microgrids in real-time.
Abstract: The fruitfulness of the microgrids' installation depend upon the design of effective control system that can commendably handle various uncertainties such as renewable energy intermittencies, dynamic variations of nonlinear/reactive loads, disturbances during connect/disconnect with utility grid, faults, inverter failures, etc. There are many simulation tools available for microgrid modeling and testing its controllers before the actual system is deployed. Howbeit, for best validation, it is always recommended to test in a real-time rather than in simulation. But, testing with real equipment is not affordable for research purpose. Further, many real-time simulators such as RTDS, RT-Lab, eMEGAsim, Typhoon-HIL, HRTSim, dSPACE, etc., brought a concept called hardware-in-the-loop (HIL) setup, that possess the advantages of both simulation and experiment. However, all these existing HIL setups are still expensive to use them for the research conducting in academic institutions. With this intent, this paper suggests some alternative and low cost HIL setups with COTS units usually available in laboratories of academic institutions such as MATLAB, LabVIEW, PLC, RTU, SCADA to simulate and test the microgrids in real-time.

14 citations

Proceedings ArticleDOI
Damodaram Kamma1, Sasi Kumar G1
01 Dec 2014
TL;DR: The productivity of enhancement tasks executed using model based software development was higher by over 10% as compared to traditional software development, suggesting that there is no adverse effect on quality.
Abstract: Model based software development promises to increase productivity by generating executable code automatically from design/models thereby eliminating the manual coding phase. Although new software development projects have yielded high productivity using model based development, its effect on productivity of maintenance projects involving enhancement tasks are not well researched. In this paper we study the impact of model based development on productivity and quality of maintenance tasks. In our study, we observed 173 enhancement tasks done using model based software development, and 156 enhancement tasks using traditional software development, in six live projects over one year at Robert Bosch Engineering a Business Solutions Ltd., a CMMi level 5 software company. For each of these tasks, we collected data on size, effort taken to complete the task, and rework effort to fix any bugs. We found that the productivity of enhancement tasks executed using model based software development was higher by over 10% as compared to traditional software development. No statistically significant difference was found between the model based and traditional software development for the rework effort suggesting that there is no adverse effect on quality.

14 citations


"Implementation of single-phase modi..." refers background in this paper

  • ...Scaling removes ambiguity in data type of variables and their internal products [8]....

    [...]