An AC Microgrid Testbed for Power Electronics Courses in the University of Puerto Rico at Mayagüez

Patarroyo-Montenegro, Juan F.; Salazar-Duque, John E.; Alzate-Drada, S.I.; Vasquez-Plaza, Jesus D.; Andrade, Fabio

doi:10.1109/andescon.2018.8564636

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…This testbed contains a Danfoss VLT-302 inverter with LCL filters, a sensor box, and other components. The testbed and the most commonly used control blocks are described in more detail in [18,21,22]. The inverter was synchronized and coupled to the grid at the Point of Common Coupling (PCC) at the beginning of the experiment (before the active power step).…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Novel Rotated Virtual Synchronous Generator Control for Power-Sharing in Microgrids with Complex Line Impedance

et al. 2023

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Virtual synchronous generator (VSG) control is based on the fact that the line impedance in a microgrid is highly inductive. This assumption was made due to the emulation of the stator winding of an electrical machine. This concept can affect the controllability of a microgrid with complex line impedance, generating deviations in the chosen operation point. To overcome this issue, additional techniques must be implemented. This paper describes a novel mathematical approach that uses the power line characteristics in a microgrid to rotate the power control reference frame and proposes a new control method called a “Rotated Virtual Synchronous Generator” (RVSG). This RVSG control approach integrates the effect of complex impedance on the microgrid’s operation and adjusts the reference frame accordingly to improve the system’s stability and performance. The use of this proposed mathematical approach in microgrids allows the further emulation of virtual inertia in microgrids that lack inertia. Finally, a comparison between RVSG control and the classical virtual synchronous generator method is carried out to show that it allows the improvement of the transient power response, power quality, stability, and performance, mainly in microgrids with complex line impedance.

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Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Novel Rotated Virtual Synchronous Generator Control for Power-Sharing in Microgrids with Complex Line Impedance

et al. 2023

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“…For this section, the parameters provided in Table 3 were used. The experimental results were obtained using the microgrid test-bench of the University of Puerto Rico-Mayaguez Campus [64]; see Figure 10. This configuration uses four Danfoss 2.2 kVA DC/AC SPCs with LCL filters, four sensor boxes with voltage-current LEM sensors and one non-linear load.…”

Section: Resultsmentioning

confidence: 99%

Benchmarking Real-Time Control Platforms Using a Matlab/Simulink Coder with Applications in the Control of DC/AC Switched Power Converters

et al. 2022

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In the control of DC/AC switched power converters (SPC), one of the most important aspects to be considered is the selection of the real-time control platform. The real-time control platform must be able to meet the high performance efficiency and regulation requirements of the DC/AC SPC, as these typically operate at switching frequencies in the order of kHz to MHz. For this reason, the hardware characteristics of the ADC and PWM, and the processing capacity of the real-time control platform are of vital importance when implementing advanced digital controllers that maintain voltage and current levels within regulatory standards. In this context, we aimed to perform a comparative study of the computation times of different real-time control platforms when implementing different control strategies for DC/AC switched power converters. We also analyzed the impact of the real-time control platforms on the THD of the voltages generated by the DC/AC switched power converters. With the help of this paper, researchers and developers will have criteria to select which real-time control platform to use in real-time control for DC/AC SPC applications.

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“…The switching frequency of the inverters was set to 10KHz using symmetric space-vector modulation. Refer to [38] for more details regarding the microgrid testbed.…”

Section: B Experimental Resultsmentioning

confidence: 99%

A Linear Quadratic Regulator With Optimal Reference Tracking for Three-Phase Inverter-Based Islanded Microgrids

Patarroyo-Montenegro

Andrade

Guerrero

et al. 2021

IEEE Trans. Power Electron.

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This work proposes a power sharing control method based on the Linear Quadratic Regulator with optimal reference tracking (LQR-ORT) for three-phase inverter-based generators using LCL filters islanded mode. Compared to SISO-based controllers, the LQR-ORT controller increases robustness margins and reduces the quadratic value of the power error and control inputs during transient response. Supplementary loops are used to reduce frequency and voltage deviations in the AC bus without communications. The supplementary loop for voltage regulation is based on the droop controller by reducing direct and quadrature output voltages according to the active and reactive power demand. A model in a synchronous reference frame that integrates power sharing and voltage-current dynamics is also proposed. In addition, a methodology to develop an islanded microgrid model in a synchronous reference frame is proposed. Robustness analysis demonstrate stability of the LQR-ORT controller under variations in the frequency and the LCL filter components. Experimental results demonstrate accuracy of the proposed model and the effectiveness of the LQR-ORT controller on improving transient response and robustness in islanded mode.

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An AC Microgrid Testbed for Power Electronics Courses in the University of Puerto Rico at Mayagüez

Cited by 15 publications

References 3 publications

Novel Rotated Virtual Synchronous Generator Control for Power-Sharing in Microgrids with Complex Line Impedance

Novel Rotated Virtual Synchronous Generator Control for Power-Sharing in Microgrids with Complex Line Impedance

Benchmarking Real-Time Control Platforms Using a Matlab/Simulink Coder with Applications in the Control of DC/AC Switched Power Converters

A Linear Quadratic Regulator With Optimal Reference Tracking for Three-Phase Inverter-Based Islanded Microgrids

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