Voltage and power control used to stabilise the distributed generation system for stand‐alone or grid‐connected operation

Goncalves, Aline; Aguiar, Cassius Rossi de; Bastos, Rogério Cid; Pozzebon, Giovani G.; Machado, Ricardo Q.

doi:10.1049/iet-pel.2015.0071

Cited by 23 publications

(9 citation statements)

References 37 publications

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“…2) i L -v O controller: widely used in uninterruptible power supply (UPS) systems with LC filters [36], [66], it is also applicable to inverters with LCL filters [67]- [69]. The controller structure is such that the inverter operates as a controlled voltage source.…”

Section: B Double-loop Control Structuresmentioning

confidence: 99%

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Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

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<div><div><div><p>Grid-tied inverters are widely used for interfacing renewable energy sources or storage devices to low-voltage electrical power distribution systems. Lately, a number of different control techniques have been proposed to address the emerging requirements of the smart power system scenario, in terms of both functionalities and performance. This paper reviews the techniques proposed for the implementation of current-controlled or voltage-controlled inverters in microgrids. By referring to a voltage source inverter with LCL output filter, the different control architectures are classified as single-, double-, and triple- loop. Then, the functionalities that are needed or recommended in the grid-connected, islanded, and autonomous operating modes of the grid-tied inverter are identified and their implementation in the different control structures is discussed. To validate the analysis and to better illustrate the merits and limitations of the most effective solutions, six control strategies are finally implemented and experimentally compared on a single-phase, grid-connected inverter setup.</p></div></div></div>

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Section: B Double-loop Control Structuresmentioning

confidence: 99%

“…The controller structure is such that the inverter operates as a controlled voltage source. Various regulators (i.e., H D2 -H D1 ) have been employed in this type of controller, most commonly: P-P [36], P-PI [49], P-PR [67], [68], [70], PI-PR [69], PR-PR [71], DB-DB [66]. Among these, the P-PR is a very common solution.…”

Section: B Double-loop Control Structuresmentioning

confidence: 99%

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

View full text Add to dashboard Cite

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“…In this paper, the designs are carried out only for ph_a. An error signal for ph_a, e a (t) for extraction of the weight vector is calculated from the differences between the measured and the estimated components of the load current [18,19]. Accordingly, weights for active and reactive power components for ph_a are updated as below:…”

Section: Natural-frame-based Proposed Ann-vlas-lmsmentioning

confidence: 99%

“…An NN-based current control algorithm for active power filter has been proposed in [18]. The uses of three-tire control strategy to avoid disturbances when the DG is connected to the grid are shown in [19]. Various conventional current control techniques are reported in [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

ANN‐based adaptive current controller for on‐grid DG system to meet frequency deviation and transient load challenges with hardware implementation

Patowary

Panda

Naidu

et al. 2017

IET Renewable Power Generation

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To maximise functional efficacy and reliability of distributed generations (DGs), this study leads to modelling, control, stability analysis, and hardware validation of a new adaptive current controller in the application of an on-grid voltage source converter (VSC) system. For effective mitigation of power system hindrances without affecting the power quality (PQ), selftuning of weights associated with the proposed variable leaky adaptive step-size-least mean square (VLAS-LMS) control algorithm based on artificial neural network (ANN) is updated in natural frame and felicitous shaping of VSC outputs are witnessed. The selection of a constant step-size associated with proposed controller usually yields updating of same weights by all the sampling periods and hardly takes care of rate of convergence factor, which decides the stability of the controller. It can no longer avoid wavering of weights during grid disturbances, resulting in high-filtering gains. Again, a constant leaky factor may lead to over-or under-parameterisation of regularisation component. These disputes can be overcome in the proposed algorithm by the introduction of an adaptive step size along with a variable leaky factor. Furthermore, PQ is maintained as tradeoff by the inclusion of detuned LC filter. Experimental outcome ensures the validation and effectiveness of the proposed controller.

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“…Since successful construction and operation of the Trans-Bay highvoltage direct current (HVDC) link, the half-bridge modular multilevel converter (HB-MMC) has received wide acceptance from utility and transmission systems operators. The HB-MMC offers attractive features such as [1][2][3][4] potential scalability to ultra-HV overhead dc systems; moreover, its ability to operate normally with a limited number of failed submodules, and resilient to ac faults. However, its main limitation is massive footprint due to the large number of its submodule capacitors.…”

Section: Introductionmentioning

confidence: 99%

Hybrid converter topologies for dc transmission systems

Adam

Alsokhiry

Abdelsalam

et al. 2019

IET Power Electronics

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this paper presents two hybrid converters with reduced power circuit complexity compared to the mixed cell modular multilevel converter (MC-MMC). The proposed converters (refer to as types 1 and 2), with the type 1 converter is formed by replacing the director switch in each arm of the conventional alternate arm converter by high-voltage half-bridge cell, rated at half of the dc link voltage. Also, the type 1 converter resembles special case of MC-MMC, where the entire halfbridge cells of each arm are replaced by a single high-voltage half-bridge cell, with both capacitors of the half and full bridge cells are exposed to fundamental current as in the conventional MMC. The upper and lower arms of the type 2 converter resemble a front-to-front connection of two three-phase hybrid cascaded two-level converters, where the cell capacitors of the three-phase two-level converters that act as director switches in the upper and lower arms do not experience fundamental currents. Thus, the type 2 converter is expected to offer substantial reduction in footprint compared to type 1 converter and the MC-MMC. The technical viability of the proposed hybrid converters are assessed using simulations, with both converters are modelled in MATLAB-SIMULINK using electromagnetic transient simulation approach, considering normal and transient conditions. Experimental results obtained from single-phase type 1 converter confirm the practical viability of the proposed converters.

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Voltage and power control used to stabilise the distributed generation system for stand‐alone or grid‐connected operation

Cited by 23 publications

References 37 publications

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

ANN‐based adaptive current controller for on‐grid DG system to meet frequency deviation and transient load challenges with hardware implementation

Hybrid converter topologies for dc transmission systems

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