Coordinated control of three- and single-phase inverters coexisting in low-voltage microgrids

With the increasing penetration level of wind turbine generators (WTGs) integrated into the power system, the WTGs are enforced to aid network and fulfill the low voltage ride through (LVRT) requirements during faults. To enhance LVRT capability of permanent magnet synchronous generator (PMSG)-based WTG connected to the grid, this paper presents a novel coordinated control scheme named overspeed-while-storing control for PMSG-based WTG. The proposed control scheme purely regulates the rotor speed to reduce the input power of the machine-side converter (MSC) during slight voltage sags. Contrarily, when the severe voltage sag occurs, the coordinated control scheme sets the rotor speed at the upper-limit to decrease the input power of the MSC at the greatest extent, while the surplus power is absorbed by the supercapacitor energy storage (SCES) so as to reduce its maximum capacity. Moreover, the specific capacity configuration scheme of SCES is detailed in this paper. The effectiveness of the overspeed-while-storing control in enhancing the LVRT capability is validated under different levels of voltage sags and different fault types in MATLAB/Simulink.

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Single-Phase Generation Headroom in Low-Voltage Distribution Networks Under Reduced Circuit Characterization

IEEE Transactions on Power Systems ◽

10.1109/tpwrs.2014.2337712 ◽

2015 ◽

Vol 30 (2) ◽

pp. 1006-1011 ◽

Cited By ~ 3

Author(s):

Pedro M. S. Carvalho ◽

Luis A. F. M. Ferreira ◽

Joao J. E. Santana

Keyword(s):

Single Phase ◽

Low Voltage ◽

Distribution Networks ◽

Voltage Distribution

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A 1.5 V CMOS high-speed 16-bit∖8-bit divider using the quotient-select architecture and true-single-phase bootstrapped dynamic circuit techniques suitable for low-voltage VLSI

Proceedings of 40th Midwest Symposium on Circuits and Systems. Dedicated to the Memory of Professor Mac Van Valkenburg ◽

10.1109/mwscas.1997.666110 ◽

2002 ◽

Author(s):

C.C. Yeh ◽

J.H. Lou ◽

J.B. Kuo

Keyword(s):

High Speed ◽

Single Phase ◽

Low Voltage ◽

Circuit Techniques

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Feasibility of Black-Box Time Domain Modeling of Single-Phase Photovoltaic Inverters Using Artificial Neural Networks

Energies ◽

10.3390/en14082118 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2118

Author(s):

Elias Kaufhold ◽

Simon Grandl ◽

Jan Meyer ◽

Peter Schegner

Keyword(s):

Time Domain ◽

Single Phase ◽

Low Voltage ◽

Black Box ◽

Steady States ◽

Domain Modeling ◽

Dynamic Simulations ◽

Time Domain Modeling ◽

Artificial Neural ◽

Grid Side

This paper introduces a new black-box approach for time domain modeling of commercially available single-phase photovoltaic (PV) inverters in low voltage networks. An artificial neural network is used as a nonlinear autoregressive exogenous model to represent the steady state behavior as well as dynamic changes of the PV inverter in the frequency range up to 2 kHz. The data for the training and the validation are generated by laboratory measurements of a commercially available inverter for low power applications, i.e., 4.6 kW. The state of the art modeling approaches are explained and the constraints are addressed. The appropriate set of data for training is proposed and the results show the suitability of the trained network as a black-box model in time domain. Such models are required, i.e., for dynamic simulations since they are able to represent the transition between two steady states, which is not possible with classical frequency-domain models (i.e., Norton models). The demonstrated results show that the trained model is able to represent the transition between two steady states and furthermore reflect the frequency coupling characteristic of the grid-side current.

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MITIGATION OF VOLTAGE UNBALACE IN RURAL LOW VOLTAGE NETWORKS USING SINGLE-PHASE BESS INVERTERS

10.1049/icp.2021.1998 ◽

2021 ◽

Author(s):

I. Mexis ◽

G. Todeschini ◽

F. Möller ◽

J. Meyer

Keyword(s):

Single Phase ◽

Low Voltage

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MULTI UNITS OF SINGLE PHASE DISTRIBUTED GENERATION COMBINED WITH BATTERY ENERGY STORAGE FOR PHASE POWER BALANCING IN DISTRIBUTION NETWORK

Jurnal Teknologi ◽

10.11113/jt.v78.9887 ◽

2016 ◽

Vol 78 (10-4) ◽

Author(s):

Amirullah Amirullah ◽

Mochamad Ashari ◽

Ontoseno Penangsan ◽

Adi Soeprijanto

Keyword(s):

Energy Storage ◽

Single Phase ◽

Low Voltage ◽

Distribution Network ◽

Battery Energy Storage ◽

Current Harmonics ◽

Line Current ◽

Distributed Generators ◽

Distribution Line ◽

Battery Energy

Randomly installed distributed generators (DGs) in households may cause unbalanced line current in a distribution network. This research presents a battery energy system for balancing of line current in a distribution network involving multi units of single phase photovoltaic (PV) distributed generators (DGs). In this paper, the PV generators were simulated consisting of a buck-boost DC/DC converter and single phase DC/AC inverter. It was connected to the distribution line through the low voltage 220 volt 50 Hz. The proposed phase balancing system uses battery energy storage and three single phase bidirectional inverters. The inverter is capable of injecting current or absorbing power from the line to the battery. This inverter operation is arranged to balance each distribution line separately, as well as to improve other power quality parameters, such as voltage and current harmonics. Simulation results show that the system was capable of improving the unbalanced line current from 15.59 % to 11, 48 % and unbalanced line voltage from 1.76 % to 0.58 %. The system was able for increasing current harmonics from 0.98 % to 1.03% and voltage harmonics from 38.96% to 39.08%.

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