Design of a Cooperative Voltage Harmonic Compensation Strategy for Islanded Microgrids Combining Virtual Admittance and Repetitive Controller

Blanco, C.; Tardelli, Francesco; Reigosa, David; Zanchetta, Pericle; Briz, Fernando

doi:10.1109/tia.2018.2868691

Cited by 41 publications

(14 citation statements)

References 29 publications

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“…In [13], an adaptive VI scheme has been presented in a multi-bus microgrid, which is capable of providing an accurate power-sharing among DGs of a microgrid when the load varies. In [14], a hybrid method consisting of VI and repetitive controllers (RCs) has been presented for load sharing and compensation of harmonic components. The main advantage of this method is that it needs only one RC for compensation of all harmonic components, which results in reduction of computational burden and complexity of the control system.…”

Section: Introductionmentioning

confidence: 99%

Voltage quality and load sharing improvement in islanded microgrids using distributed hierarchical control

Ghanizdeh

Gharehpetian

2019

IET Renewable Power Generation

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In this study, to compensate voltage unbalance and harmonics and improve load sharing, a distributed hierarchical control scheme is proposed for islanded microgrids. In the proposed scheme, a method is proposed, which can improve the voltage quality of sensitive load bus by determining the amount of effort made by each distributed generation (DG) and taking their rated power constraints into account for compensation. Moreover, this method is capable of improving the load sharing among DG units adaptively using circulating currents rule. Compared to the previous proposed methods, the method proposed in this study does not need a central controller, and communication is only needed between adjacent DG units. Furthermore, in this scheme, the contribution of each DG unit in compensation will be in proportion to its rated power, and none of them will be overloaded. Also, to compensate the error of load current sharing components, there is no need to have any information about impedance of DGs feeders and load type. To show the efficiency of the proposed scheme, simulation studies are performed on a typical islanded microgrid in MATLAB/Simulink environment.

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Section: Introductionmentioning

confidence: 99%

Voltage quality and load sharing improvement in islanded microgrids using distributed hierarchical control

Ghanizdeh

Gharehpetian

2019

IET Renewable Power Generation

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“…It has the advantage of no remote current measurement and high compensation accuracy. A design of a cooperative voltage harmonic compensation combining virtual admittance and repetitive controller (RC) was proposed in [38]. This method requires only one RC to compensate for all the harmonic components, significantly reducing the computational burden and the design complexity.…”

Section: Introductionmentioning

confidence: 99%

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Bouzid

Sicard

Chaoui

et al. 2019

IET Power Electronics

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This study proposes a cascaded voltage-current robust control strategy for a distributed generator (DG) in microgrids. The main objective of the proposed controller is to improve the performance and power quality of a DG by injecting simultaneously a good sinusoidal voltage/current to the different loads connected to the DG. The proposed cascaded voltage/ current controller consists of three degree-of-freedom controller, which is designed by using H∞ control theory based on mixed sensitivity specifications. The choices of appropriate weighting functions W t , W u , W y that satisfy the preset goals to get a robust controller and a transform to a standard H∞ control design problem based on pre-compensator, feedforward and feedback connections are presented. The 3DOF-controller is based on MATLAB R/SimPowerSystems and using RT-EVENTS-toolbox. The controller is evaluated under different scenarios: transient responses with a resistive local load, and loads disturbances in steady-state responses with resistive, resistive inductive, resistive capacitive, and non-linear loads. Simulation and experimental results of resulting waveforms from a DG unit are presented, it confirms the effectiveness of the proposed method in effectively rejecting perturbation and robustness to loads disturbances; both good reference tracking and good transient response, and finally significantly lead to a very low total harmonic distortion.

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“…A lower switching frequency deteriorates the effect of control delay and greatly reduces the stability of the control system. Moreover, a lower switching frequency also causes the controller to lose efficacy [26,27], such as the resonant controller [28][29][30][31][32][33][34][35], repetitive controller [36], deadbeat controller [37], etc., which further causes instability problems in traditional discretization methods, such as the zero-order hold (ZOH) approach, forward Euler (FWE) approach, backward Euler (BWE) approach, etc. [38].…”

Section: Introductionmentioning

confidence: 99%

Control Strategy of Three-Phase Inverter with Isolation Transformer

Chen

Qiu

et al. 2019

Energies

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In order to improve the control performance of a train auxiliary inverter and satisfy the requirements of power quality, harmonics, and unbalanced factor, this paper proposed a design method of a double closed-loop control system based on a complex state variable structure. The method simplifies the design process and takes full account of the effects of coupling and discretization. In the current closed-loop process, this paper analyzed the limitations of the proportional integral (PI) controller and simplified to P controller. In the voltage closed-loop, the paper employed the PI controller plus the resonant controller, designed the parameters of the PI controller. and analyzed the optimal discretization method of the resonant controller under dq axis coupling. Finally, experiments and simulations were conducted to show that the proposed method can achieve the above improvements.

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Design of a Cooperative Voltage Harmonic Compensation Strategy for Islanded Microgrids Combining Virtual Admittance and Repetitive Controller

Cited by 41 publications

References 29 publications

Voltage quality and load sharing improvement in islanded microgrids using distributed hierarchical control

Voltage quality and load sharing improvement in islanded microgrids using distributed hierarchical control

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Control Strategy of Three-Phase Inverter with Isolation Transformer

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