An Active Damping Technique for PI and Predictive Controllers of an Interlinking Converter in an Islanded Hybrid Microgrid

Hussain, Mosaddique Nawaz; Melath, Gopakumar; Agarwal, Vivek

doi:10.1109/tpel.2020.3030875

Cited by 24 publications

(5 citation statements)

References 29 publications

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“…p * = p l + p Loss and q * = q l are computed and transformed back to the abc plane using the inverse Clarke's transformation, as in Equation (17).…”

Section: Ic Controlmentioning

confidence: 99%

“…This IC supports power exchange between the AC and DC subgrid, allowing us to integrate various types of DG units and loads with an energy storage facility. Different structures and control strategies of ICs are developed by researchers to improve the performance and power rating [15,17]. Since renewables are uncertain, they are combined with other conventional energy sources and/or energy storage systems.…”

Section: Introductionmentioning

confidence: 99%

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Design of Decentralized Hybrid Microgrid Integrating Multiple Renewable Energy Sources with Power Quality Improvement

et al. 2022

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Due to the energy crisis and exhaustion in the amount of fossil fuels left, there is an urge to increase the penetration of renewables in the grid. This paper deals with the design and control of a hybrid microgrid (HMG) in the presence of variable renewable energy sources. The DC sub-grid consists of a permanent magnet synchronous generator (PMSG) wind turbine, solar PV array with a perturb-and-observe (P&O) MPPT algorithm, boost converter, and battery energy storage system (BESS) with DC loads. The AC sub-grid consists of a PMSG wind turbine and a fuel cell with an inverter circuit synchronized to the grid to meet its load demand. A bidirectional interlinking converter (IC) connects the AC sub-grid and DC sub-grid, which facilitates power exchange between them. The decentralized control of converters allows all the renewables to operate in coordination independently without communication between them. The proposed control algorithm of the IC enables it to act as an active power filter in addition to the power exchange operation. The active power filtering feature of the IC helps to retain the power quality of the microgrid as per IEEE 519 standards by providing reactive power support and reducing the harmonic levels to less than 5%. The HMG with the proposed algorithm can operate in both grid-connected and islanded modes. While operating in grid-connected mode, power exchange between DC and AC sub-grids takes place and all the load demands are met. If it is in islanded mode, a diesel generator supports the AC sub-grid to meet the critical load demands and the BESS supports the DC microgrid. The proposed model is designed and simulated using MATLAB-SIMULINK and its results are analyzed. The efficacy of the proposed control is highlighted by comparing it with the existing controls and testing the HMG for load variations.

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“…p * = p l + p Loss and q * = q l are computed and transformed back to the abc plane using the inverse Clarke's transformation, as in Equation (17).…”

Section: Ic Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Decentralized Hybrid Microgrid Integrating Multiple Renewable Energy Sources with Power Quality Improvement

et al. 2022

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“…Once these elements are added, the proposal verifies whether the obtained intermediate microgrid is the same as the target microgrid, the case in which the optimisation process is executed for the last time, and the best control parameters for the target microgrid are obtained. If the intermediate microgrid differs from the target microgrid, its OF is calculated and compared to a limit value of Y times the best obtained OF, as in (11). When the limit value is surpassed, the optimisation process is once again executed.…”

Section: Stage 3: Enlarging the Basic Microgridsmentioning

confidence: 99%

“…e VSC is a nonlinear device that requires several control layers, which are considered by the microgrid hierarchical control [5]. ese control schemes are usually based on proportional-integral (PI) strategies, whose parameters are cautiously selected to obtain an adequate microgrid behaviour [3,[6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Iterative Approach for Tuning Multiple Converter-Integrated DER in Microgrids

García-Ceballos

Pérez-Londoño

Flórez

2022

International Transactions on Electrical Energy Systems

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This paper proposes an iterative approach to adjust the control parameters of multiple power converters within a microgrid, which operates in grid-connected and grid-islanded modes. The adequate control parameters are determined using an optimisation-based strategy, local measurements, and results obtained in previous algorithm iterations. The proposed objective function is based on the integral time-weighted absolute error (ITAE), modified to improve the microgrid control performance. The proposed approach addresses the control tuning complexity by considering an incremental strategy, starting from adjusting basic microgrids, continuing to the setting of intermediate microgrids, and finalising when the target microgrid control is fine adjusted. The results obtained at the CIGRE LV benchmark microgrid validate the proposal, obtaining during faults, the maximum deviations from rated frequency around 2.2% and 0.3% in grid-islanded or grid-connected cases, respectively. Also, voltage and power references are adequately followed during steady-state regardless of the microgrid operation mode, where the steady voltage profile is below 10% variation. The obtained results demonstrate the proposed approach advantages, which straightforwardly adjust multiple converters integrated into a microgrid. The main contributions are as follows: (a) the microgrid model is not required, and (b) only measurements at the point of common coupling of the distributed energy resource are used; consequently, the proposed tuning approach is especially applicable to complex microgrids. Finally, finely adjusted microgrids are required for further operation or protection studies where complex system configurations are commonly required.

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“…The range of frequencies and the grid conditions that lead to the instability due to frequency coupling is identified and a PR controller with a circulating current suppression controller is proposed. The power quality issues arising due to the instability issues of the IC are investigated in [18][19][20][21][22]. Additionally, in [23], a novel strategy based on sliding mode control to improve dynamic stability was proposed.…”

Section: Introductionmentioning

confidence: 99%

Decoupler-Based Feedback Control Strategy for Interlinking Converter in a Hybrid Microgrid

Nair

Kanakasabapathy

2023

Designs

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In a hybrid microgrid with AC and DC subgrids, the interlinking converter (IC) is the key element connecting the two subgrids. The performance of the interlinking converter is adversely affected by the d- and q-axis impedance interaction between the inner control loops. This interaction is highly undesirable since it adversely affects both the dynamic and the steady-state performance of the IC. Based on this, a novel feedback-based decoupling strategy is developed to overcome the cross-coupling effect in the mathematical model of the interlinking converter. This is a novel concept since the feed-forward compensation techniques are utilized to address the cross-coupling effect in prior related works, which has an inherent disadvantage of additional disturbance due to the addition of the compensating terms. In this study, a complete decoupling of the d and q axes was achieved, and the first-order transfer functions were obtained for the control loops using systematic block-reduction algebra and direct synthesis approaches. With this model, computational complexities are reduced and the inner control loops are free from impedance interaction effects, thereby achieving enhanced transient stability. Perfect decoupling of the voltage vectors is achieved by the matrix diagonalization method. Furthermore, the novelty of the proposed control is that the decoupled model is integrated with a normalization-based coordinate control strategy for effective bidirectional power transfer via the interlinking converter. Additionally, the proposed controller’s validity was tested for its performance under different transients in the MATLAB Simulink platform. The simulation results validated the proposed control strategy by showing that a faster response is ensured. A high-quality reference signal is generated due to the effective decoupling achieved. This observation was also validated by comparing the T.H.D. levels of a decoupled model’s reference power signal to one without a decoupling strategy.

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An Active Damping Technique for PI and Predictive Controllers of an Interlinking Converter in an Islanded Hybrid Microgrid

Cited by 24 publications

References 29 publications

Design of Decentralized Hybrid Microgrid Integrating Multiple Renewable Energy Sources with Power Quality Improvement

Design of Decentralized Hybrid Microgrid Integrating Multiple Renewable Energy Sources with Power Quality Improvement

Iterative Approach for Tuning Multiple Converter-Integrated DER in Microgrids

Decoupler-Based Feedback Control Strategy for Interlinking Converter in a Hybrid Microgrid

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