Finite Control Set Model Predictive Control for Grid-Connected AC–DC Converters With LCL Filter

Falkowski, Piotr; Sikorski, Andrzej

doi:10.1109/tie.2017.2750627

Cited by 189 publications

(104 citation statements)

References 41 publications

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“…Multiple levels of control are applied to the microgrids, including energy management, load supervision, voltage and current control in primary control level, power quality issues including power flow control and synchronization with grid in secondary control level and finally in tertiary control level, economic dispatch, DSM and microgrid supervision are the focus areas [181]. The other popular control method in this area is Model predictive control or direct control that could be utilized in harmonic compensation and power quality improvement and active power filter applications because of its good dynamic response and simplicity of the controller [70,[182][183][184]. In the next section, there will be a detailed discussion of the two control levels [185] as the third control level is not the focus area in the field of this paper.…”

Section: Control Methods Of Mfressmentioning

confidence: 99%

An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks

Naderi

Hosseini

Zadeh

et al. 2018

Renewable and Sustainable Energy Reviews

129

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-It is obvious that power quality is an important characteristic of today's distribution power systems as loadsbecome more sensitive on the other hand nonlinear loads are increasing in the electrical distribution system. Considering the distributed nature of harmonic loads, the need for distributed power quality improvement (PQI) is inevitable. From years ago, researchers have been working on various kinds of filters and devices to enhance the overall power quality of power system, but today the nature of distribution system has been changed and power electronic based DGs play an important role in distribution grids. In this paper, a thorough survey is done on power quality enhancement devices with emphasis on ancillary services of multi-functional DGs. A literature review is also done on microgrids concept, testbeds and related control methods. Although there were some applications of DGs for PQI improvement these applications were not defined multi-functional DGs. Various control methods are studied and categorized regarding different viewpoints in the literature. Finally, a couple of thorough comparisons are done between the available techniques considering the nature, capabilities, advantages and implementation costs.

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Section: Control Methods Of Mfressmentioning

confidence: 99%

An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks

Naderi

Hosseini

Zadeh

et al. 2018

Renewable and Sustainable Energy Reviews

129

View full text Add to dashboard Cite

show abstract

“…To effectively attenuate the injected current harmonics and get a better dynamic performance, an LCL filter is widely inserted between the VSI and the unity grid. However, the inherent resonance problem of the LCL filter may lead to the instability and reduce the performance of the system, which brings the challenge to the controller design, especially when the uncertainties of LCL filter parameters and grid impedance are considered [3,4].…”

Section: Introductionmentioning

confidence: 99%

Model‐Based Discrete Sliding Mode Control with Disturbance Observer for Three‐Phase LCL‐Filtered Grid‐Connected Inverters

Huang

et al. 2020

IEEJ Transactions Elec Engng

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Grid‐connected voltage source inverters with LCL filters have been widely used for distributed generation systems in renewable energy systems. The presence of LCL resonance influences the overall performance and complicates the system control design, especially when the uncertainties caused by the component parameter variations and disturbances are considered. In order to improve the system performance under uncertain conditions, this paper presented a model‐based discrete sliding mode control (SMC) with disturbance observer (DOB) for three‐phase LCL‐filtered grid‐connected inverters. In this work, the inverter model is modified by using a virtual damping resistor to eliminate the resonance of the LCL filter and improve the stability, even consider the variations of the grid impedance. To save the sensors and predict the forward step of the state variables, a discrete state observer is adopted in the control. To enhance the robustness of the system, a DOB is designed in the SMC controller to estimate the disturbances so that the system uncertainties can be effectively compensated. Finally, comparative simulations and experiments are constructed to demonstrate the effectiveness of the proposed method. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…Recently, Falkowski et al [12] proposed an FCS-MPC method for the inductance-capacitanceinductance (LCL)-filtered grid-tied ac-dc converter, which can damp the oscillations caused by the filter resonance and acquire the high performance of grid currents. However, this FCS-MPC method requires to measure the inverter-side current, the capacitor voltage grid voltage, and the grid-injected current by sensors, increasing the cost and complexity.…”

Section: Introductionmentioning

confidence: 99%

“…where ε are the errors of controlled variables between reference value and estimated value. The weighting factor λ uc is set to achieve active damping [27], and λ i2 is tuned to obtain a high quality grid-injected current [12], and the weighting factors are designed according to [28]. 10.…”

mentioning

confidence: 99%

Finite Control Set Model Predictive Control for an LCL-Filtered Grid-Tied Inverter with Full Status Estimations under Unbalanced Grid Voltage

Chen

Gao

et al. 2019

Energies

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This paper proposes a novel finite control set model predictive control (FCS-MPC) strategy with merely grid-injected current sensors for an inductance-capacitance-inductance (LCL)-filtered grid-tied inverter, which can obtain a sinusoidal grid-injected current whether three-phase grid voltages are balanced or not. Compared with the conventional FCS-MPC method, four compositions are added in the proposed FCS-MPC algorithm, where the grid voltage observer (GVO) and Luenberger observer are combined together to achieve full status estimations (including grid voltage, capacitor voltage, inverter-side current, and grid-injected current), while the sequence extractor and the reference generator are applied to eliminate the double frequency ripples of the active or reactive power, or the negative sequence component (NSC) of the grid-injected current caused by the unbalanced grid voltage. Simulation model and experimental platform are established to verify the effectiveness of the proposed FCS-MPC strategy, with full status estimations under both balanced and unbalanced grid voltage conditions. However, these control schemes are usually designed under the ideal grid voltage condition, and the negative effects caused by the negative sequence component (NSC) are not considered. Therefore, under the unbalanced grid voltage condition, the feasibilities of current sensorless control schemes need be further verified [17].To alleviate the adverse effects of the unbalanced grid voltage, the positive sequence component (PSC) and the NSC of the grid voltages are required to be separated first, and then applied in the control algorithm [18][19][20][21]. In [18], for the distributed generation inverter, a flexible reference generator based on positive and negative active and reactive powers, was proposed to keep feeding the grid and support the grid voltage under the unbalanced grid voltage condition. In [19], to overcome the distortion of grid-injected currents caused by the unbalanced grid voltages, Zheng et al. proposed an improved virtual synchronous generator control method with the additional positive-sequence current adjuster, allowing the reference currents to track the positive sequence currents and inhibiting the negative-sequence components. In [20], Suul et al. proposed a virtual-flux-based method for the voltage-sensorless grid synchronization under variable grid frequency and unbalanced voltage conditions, integrating the functions of frequency-adaptive bandpass filtering, the virtual flux estimation, and the sequence separation into one operation. In [21], Yang et al. proposed a sliding-mode grid voltage observer for the voltage-sensorless operation under an unbalanced network, separating the PSC and NSC inherently. The variables of methods proposed in [18,19] are all based on the full state measurements, while only one kind of sensor is reduced in [20,21]. Note that it is of great challenge for the LCL-filtered grid-tied inverter to further reduce the number of sensors, especially under the unbalanced grid voltage con...

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Finite Control Set Model Predictive Control for Grid-Connected AC–DC Converters With LCL Filter

Cited by 189 publications

References 41 publications

An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks

An overview of power quality enhancement techniques applied to distributed generation in electrical distribution networks

Model‐Based Discrete Sliding Mode Control with Disturbance Observer for Three‐Phase LCL‐Filtered Grid‐Connected Inverters

Finite Control Set Model Predictive Control for an LCL-Filtered Grid-Tied Inverter with Full Status Estimations under Unbalanced Grid Voltage

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