A rapid prototyping tool for load and source emulation in a microgrid test laboratory

Hogan, Diarmaid J.; Egan, M.G.; Hayes, John G.; Lightbody, Gordon; González-Espín, Fran

doi:10.1109/apec.2014.6803616

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…Failure to address these issues may cause unrealistic or incorrect results [16]. Digital based grid emulators typically involve only one emulation target or aim at systems with the complexity and power level no more than that of a microgrid [17]- [19]. This still leaves the need for transmission level emulation platforms.…”

Section: B Motivationmentioning

confidence: 99%

Reconfigurable Real-Time Power Grid Emulator for Systems With High Penetration of Renewables

Tolbert

Wang

Tomsovic

et al. 2020

IEEE Open J. Power Energy

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Novel power system control and new utility devices need to be tested before their actual deployment to the power grid. To assist with such a testing need, real-time digital emulators such as RTDS and Opal-RT can be used to connect to the physical world and form a hardware in the loop (HIL) emulation. However, due to the limitations of today's computational resources, the accuracy and fidelity suffer from different levels of model reductions in purely digital simulations. CURENT has developed a reconfigurable electric grid hardware testbed (HTB) to overcome the limitations of digital emulators. The HTB has been used to develop measurement, control, modeling, and actuation techniques for a national grid with a high penetration of renewables. The power electronic-based system includes emulators for synchronous generators; photovoltaics with gridinterfacing inverter; wind turbines; induction motor loads, ZIP loads, power electronic loads; batteries; ac and dc transmission lines; short circuit faults and grid relay protection; and a multiterminal HVDC overlay including power electronics interfaces. The system contains real elements of power flow, measurement, communication, protection, and control that mimic what would be seen in an actual electric grid. This paper presents an overview of the HTB and several scenarios that have been run to determine control and actions needed for the future power grid.

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Section: B Motivationmentioning

confidence: 99%

Reconfigurable Real-Time Power Grid Emulator for Systems With High Penetration of Renewables

Tolbert

Wang

Tomsovic

et al. 2020

IEEE Open J. Power Energy

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show abstract

“…As opposed to the baseline controller, which is nominally designed for decoupled operation, the desired closed-loop dynamics of the state-predictor are designed for nominal operation of the DGUs when coupled to neighbouring DGUs, and is applied to all DGUs. A priori knowledge of the real-time number of neighbouring DGUs is not known, therefore the maximum possible number of couplings, within the set D, is chosen, as in (8). The desired closed-loop dynamics in, are selected as (in normal form, i.e.…”

Section: Design Considerationsmentioning

confidence: 99%

Voltage Control of DC Islanded Microgrids: Scalable Decentralised L1 Adaptive Controllers

O'Keeffe,

Riverso,

Albiol-Tendillo

et al. 2018

Preprint

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Voltage stability is a critical feature of an efficiently operating power distribution system such as a DC islanded microgrid. Large-scale autonomous power systems can be defined by heterogeneous elements, uncertainty and changing conditions. This paper proposes a novel scalable decentralised control scheme at the primary level of the typical hierarchical control architecture of DC islanded microgrids with arbitrary topology. Local state-feedback L1 adaptive controllers are retrofitted to existing baseline voltage controllers of DC-DC boost converters, which interface distributed generation units with loads. Furthermore, local controller synthesis is modular as it only requires approximate information about the line parameters that couple neighbouring units. The performance of the proposed architecture is evaluated using a heterogeneous DC islanded-microgrid that consists of 6 DC-DC boost converters configured in a radial and meshed topology. The use of L1 adaptive controllers achieves fast and robust microgrid voltage stability in the presence of plug-and-play operations, unknown load and voltage reference changes, and unmodelled dynamics. Finally, sufficient conditions for global stability of the overall system are provided.

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“…Loads available in the system include a 10 kW resistive bank, power-line emulator, passive three-phase fault emulator, and a 50 kVA configurable passive load bank. A 15 kVA three-phase inverter connected in a back-to-back configuration is used as a load emulator capable of emulating a number of linear and non-linear loads, as well as generation equipment [16].…”

Section: Microgrid Test Laboratorymentioning

confidence: 99%

Adaptive resonant current-control for active power filtering within a microgrid

Hogan

González-Espín

Hayes

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper presents an adaptive current-control scheme for a three-phase active-power filter (APF) for use within a microgrid. A vector-proportional-integral (VPI) controller with grid frequency tracking capabilities is used to compensate up to the 18 th harmonic in the synchronous-reference-frame. This control scheme utilizes an advanced synchronous-referenceframe phase-locked loop (SRF-PLL) to update the resonant frequency values of the current controllers to ensure the resonant frequency of the VPI remain at the optimum point regardless of changes in the grid frequency. The advanced SRF-PLL uses adaptive digital notch filters based on the adaptive lattice structure to implement an adaptive lattice SRF-PLL (ALSRF-PLL). The ALSRF-PLL is able to reject the grid voltage harmonics thus preventing the estimation of the grid frequency to be polluted, which is essential for the correct behavior of the adaptive VPI controllers. In order to validate the adaptive control structure applied to APF, experimental testing has been carried out in a 70 kVA laboratory microgrid, where a 15 kVA three phase inverter is used as the APF.

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A rapid prototyping tool for load and source emulation in a microgrid test laboratory

Cited by 17 publications

References 14 publications

Reconfigurable Real-Time Power Grid Emulator for Systems With High Penetration of Renewables

Reconfigurable Real-Time Power Grid Emulator for Systems With High Penetration of Renewables

Voltage Control of DC Islanded Microgrids: Scalable Decentralised L1 Adaptive Controllers

Adaptive resonant current-control for active power filtering within a microgrid

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