Frequency- adaptive control of a three-phase single-stage grid-connected photovoltaic system under grid voltage sags

Rey-Boué, Alexis B.; Guerrero-Rodríguez, N.F.; Stöckl, Johannes; Strasser, Thomas

doi:10.1016/j.ijepes.2020.106416

Cited by 12 publications

(4 citation statements)

References 48 publications

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“…Different control schemes such as adaptive control [30,31], boundary layer control [32,33], model predictive control [34,35] and time-delayed robust controller [36], have been utilized to achieve the desired performance. However, these techniques are parameter dependent.…”

Section: Inner Control Loopmentioning

confidence: 99%

Filter Extracted Sliding Mode Approach for DC Microgrids

Yasin

Riaz

et al. 2021

Electronics

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The advantages offered by DC microgrids, such as elimination of skin effect losses, no requirement of frequency synchronization and high efficiency for power transmission are the major reasons that microgrids have attracted the attention of researchers in the last decade. Moreover, the DC friendly nature of renewable energy resources makes them a perfect choice for integration with DC microgrids, resulting in increased reliability and improved stability. However, in order to integrate renewable energy resources with the DC microgrids, challenges like equal load sharing and voltage regulation of the busbar under diverse varying load conditions are to be addressed. Conventionally, droop control with PI compensation is used to serve this purpose. However, this cascaded scheme results in poor regulation to large load variations and steady state errors. To address this issue, this paper presents a sliding mode control-based approach. Key features of SMC are its ease of implementation, robustness to load variations, and fast dynamic response. The system model is derived and simulated to analyze the stability and performance of the proposed controller. An experimental test bench is developed to demonstrate the effectiveness of SMC against modeled dynamics and is compared with the droop controller. The results show an improvement of 26% and 27.4% in the rise time and settling time, respectively. Robustness of the proposed scheme is also tested by switching it with a step load and an improvement of 40% has been observed.

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Section: Inner Control Loopmentioning

confidence: 99%

Filter Extracted Sliding Mode Approach for DC Microgrids

Yasin

Riaz

et al. 2021

Electronics

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“…After that, the frequency adaptive control technique is utilized with grid-connected singlestage system is used to compensate for the voltage sag in the supply of the load. The model only focused on the voltage sag by employing frequency locked loop [15]; for the voltage swell and any other harmonic problem, another control technique is needed. The second and reducedorder generalized integrator (SOGI-ROGI) [16] are cascaded to filter the distortion in the grid voltage, while the model suffer from the DC offset voltage problem.…”

Section: Introductionmentioning

confidence: 99%

Automatic Adaptive Synchronization (A2S): A Demand-based Automatic Synchronization for Grid Connected Distribution Generators in Islanding Mode

Ramesh

2023

Preprint

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For grid-connected islanded connection of microgrid, the synchronization is necessary, but the existing methods solve the problem with high harmonics in the signal. And also, the imbalanced voltage and rate of change of frequency at the microgrid are obtained by the sensor network or by synchronizing relays in many studies, which is an expensive technique. Hence to solve the problem, the paper introduced the automatic adaptive synchronization (A2S) scheme by using optimization and control techniques to synchronize the microgrid with the decentralized generators. The multiple decentralized generators serve the load through the microgrid, the voltage and phase are synchronized with the adaptive neuro-fuzzy inference system (ANFIS). The imbalance among them is sensed by the rain optimization algorithm (ROA). Thus the sensed changes are fed to the controller to provide gating signals accordingly to the cascaded H-bridge multi-level inverter with reduced harmonics. The distributed generator feeds the load through the 14km feeder line and synchronizes the three-phase voltage at 1.9ms with 2.28% distortion.

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“…In these cases, tuning the parameters is relatively simple since the small‐signal model of SRF‐PLL is well acknowledged. However, the harmonic suppression is not satisfactory unless the dynamic response is very slow which may be unacceptable in some applications, for example, the distributed generation system [10], the low voltage ride through control [11], and variable frequency AC system [12].…”

Section: Introductionmentioning

confidence: 99%

“…FIGURE11 Step response of G cl (s) with the optimal parameters obtained by the conventional method and the proposed method.…”

mentioning

confidence: 99%

Optimal design of phase‐locked loop with frequency‐adaptive prefilter based on the accurate small‐signal model

Xia

Lei

Zhou

et al. 2023

IET Renewable Power Gen

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Frequency‐adaptive prefilters are widely used in the phase‐locked loop (PLL) to suppress input disturbances. However, the parameters of the PLL and prefilters are often designed separately or based on an inaccurate model. The positive feedback effect introduced by the frequency adaption (FA) is usually ignored, leading to non‐optimal performance. Based on the accurate small‐signal model with a particular focus on the FA, this paper proposes an optimal design method for these advanced PLLs. The PLL based on dual second‐order generalized integrator (DSOGI) is taken as an example to demonstrate the principle. With different gain margins, the optimal damping factors of DSOGI and PLL, as well as the natural frequency of PLL, are obtained using the proposed method. Then the global optimal parameters are obtained by evaluating the settling time and overshoot. The analysis shows that the truly optimal parameters are quite different with those provided in the literature, and the dynamic performance is significantly enhanced without degrading the steady‐state performance. Experimental results are presented to verify the theoretical analysis.

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Frequency- adaptive control of a three-phase single-stage grid-connected photovoltaic system under grid voltage sags

Cited by 12 publications

References 48 publications

Filter Extracted Sliding Mode Approach for DC Microgrids

Filter Extracted Sliding Mode Approach for DC Microgrids

Automatic Adaptive Synchronization (A2S): A Demand-based Automatic Synchronization for Grid Connected Distribution Generators in Islanding Mode

Optimal design of phase‐locked loop with frequency‐adaptive prefilter based on the accurate small‐signal model

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