Damping techniques for grid-connected voltage source converters based on LCL filter: An overview

Gomes, Camilo C.; Cupertino, Allan Fagner; Pereira, Heverton A.

doi:10.1016/j.rser.2017.07.050

Cited by 108 publications

(73 citation statements)

References 84 publications

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“…The ideal transfer function of LCL filters is given by Equation (11). Figure 6 shows six passive damping topologies that can be classified into three groups: series passive damping (SPD); parallel passive damping (PPD), and complex passive damping (CPD) [27]. Figure 6a shows an SPD topology commonly found in the literature, consisting of the introduction of an R d resistance in the capacitor branch.…”

Section: Output Filter Topologiesmentioning

confidence: 99%

Proportional Resonant Current Control and Output-Filter Design Optimization for Grid-Tied Inverters Using Grey Wolf Optimizer

et al. 2020

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This paper proposes a new method for the simultaneous determination of the optimal control parameters of proportional resonant controllers and the optimal design of the output filter of a grid-tied three-phase inverter. The proposed method, based on the grey wolf optimization (GWO) algorithm, addresses both optimization problems as a single process to achieve a better system frequency response. It optimizes the unknown parameters by using a fitness function to find the best trade-off between the following fundamental terms: the harmonic attenuation rate; the power loss, through the damping resistor; and the current tracking error in the stationary frame, ensuring the system and grid stability. To validate the proposed optimization methodology, two case studies are considered with different output filter topologies with passive damping methods. The results obtained from the proposed optimization procedure were analyzed and discussed according to the fitness function terms.

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Section: Output Filter Topologiesmentioning

confidence: 99%

Proportional Resonant Current Control and Output-Filter Design Optimization for Grid-Tied Inverters Using Grey Wolf Optimizer

et al. 2020

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“…Figure 2 shows filter inductance L f and shunt capacitance C f . The grid impedance or transformer leakage inductance or both serve as coupling inductor [58]. The LC filter arrangement depicted is used for the grid-connected inverter with local load in between.…”

Section: Output Lc Filtermentioning

confidence: 99%

Fault Ride-Through Enhancement of Grid Supporting Inverter-Based Microgrid Using Delayed Signal Cancellation Algorithm Secondary Control

2019

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The growing level of grid-connected renewable energy sources in the form of microgrids has made it highly imperative for grid-connected microgrids to contribute to the overall system stability. Consequently, secondary services which include the fault ride-through (FRT) capability are expected to be possessed characteristics by inverter-based microgrids. This enhances the stable operation of the main grid and sustained microgrid grid interconnection during grid faults in conformity with the emerging national grid codes. This paper proposes an effective FRT secondary control strategy to coordinate power injection during balanced and unbalanced fault conditions. This complements the primary control to form a two-layer hierarchical control structure in the microgrids. The primary level is comprised of voltage/power and current inner loops fed by a droop control. The droop control coordinates grid power-sharing amongst the voltage source inverters. When a fault occurs, the participating inverters operate to support the grid voltage, by injecting supplementary reactive power based on their droop gains. Similarly, under unbalanced voltage condition due to asymmetrical faults in the grid, the proposed secondary control ensures the positive sequence component compensation and negative and zero sequence components clearance using a delayed signal cancellation (DSC) algorithm and power electronic switched series impedance placed in-between the point of common coupling (PCC) and the main grid. While ensuring that FRT ancillary service is rendered to the main utility, the strategy proposed ensures relatively interrupted quality power is supplied to the microgrid load. Consequently, this strategy ensures the microgrid ride-through the voltage sag and supports the grid utility voltage during the period of the main utility grid fault. Results of the study are presented and discussed.

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“…18(a). Unlike proportional capacitor current feedback method discussed in [9] [10] and [28], there is no transient spikes and the injected current tracks the reference current smoothly with least amount of transient resonance and oscillation. The Phase-A line current THD for one cycle after the step change with the proposed damping loop is shown in Fig.…”

Section: A Hardware Setupmentioning

confidence: 99%

“…In general, for LCL filtered grid connected inverters, resonance suppression is achieved by employing active and passive damping approaches [9]. Passive damping approach is implemented by adding a passive component like inductor, resistor or both with the filter component.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Resonance Mitigation and Performance Improvement in Distributed Generation based LCL Filtered Grid Connected Inverters

Khan¹,

Mansoor²,

Ali³

et al. 2019

IJACSA

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Resonance turns into a growing issue of paramount importance for stable operation of LCL filtered grid-connected inverters. Active damping algorithms are widely adopted to restrain the resonance peak associated with LCL filters. The focus of this paper is to develop an improved active damping solution based on filter capacitor current for better control performance of three-phase LCL grid-connected inverters. In the proposed solution, an improved compensator is included across the LCL filter system and capacitor current feedback. A damping loop is implemented with the proposed combination, which is further feedback at a reference voltage point of the three-phase inverter to damp the aroused resonance peak. The substantial features of the proposed configuration are wide damping range of resonance frequency and high control bandwidth, which results in faster dynamic response in comparison with conventional capacitor current proportionally feedback. Moreover, the stability of current loop is examined in detail by implementing the proposed damping method under the filter parametric variations. Finally, the efficacy of the proposed method is validated by illustrating the outcomes based on steady state and transient responses through simulations and experimental results of the laboratory prototype.

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Damping techniques for grid-connected voltage source converters based on LCL filter: An overview

Cited by 108 publications

References 84 publications

Proportional Resonant Current Control and Output-Filter Design Optimization for Grid-Tied Inverters Using Grey Wolf Optimizer

Proportional Resonant Current Control and Output-Filter Design Optimization for Grid-Tied Inverters Using Grey Wolf Optimizer

Fault Ride-Through Enhancement of Grid Supporting Inverter-Based Microgrid Using Delayed Signal Cancellation Algorithm Secondary Control

Resonance Mitigation and Performance Improvement in Distributed Generation based LCL Filtered Grid Connected Inverters

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