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Dr. Juan Patarroyo
University of Puerto Rico, Mayagüez Campus, Mayagüez, Puerto Rico, US

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0 Embedded Systems
0 Optimal Control
0 Renewable Energy
0 Robust Control
0 Control systems

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Journal article
Published: 22 June 2021 in Applied Sciences
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One of the most important aspects that need to be addressed to increase solar energy penetration is the power ramp-rate control. In weak grids such as the one found in Puerto Rico, it is important to smooth power fluctuations caused by the intermittence of passing clouds. In this work, a novel power ramp-rate control strategy is proposed. Additionally, a comparison with some of the most common power ramp-rate control methods is performed using a proposed model and real solar radiation data from the Coto Laurel photovoltaic power plant located in Ponce, Puerto Rico. The proposed model was validated using one-year real data from Coto Laurel. The power ramp-rate control methods were compared in real-time simulations using the OP5700 from Opal-RT Technologies considering power ramp rate fluctuations, power ramp-rate violations, fluctuations in the state-of-charge, among other indicators. Moreover, the proposed power ramp-rate control strategy, called predictive dynamic smoothing was explained and compared. Results indicate that the predictive dynamic smoothing produced a considerably reduced Levelized Cost of Storage compared to other power ramp-rate control methods and provided a higher lifetime expectancy for lithium batteries.

ACS Style

Juan Patarroyo-Montenegro; Jesus Vasquez-Plaza; Omar Rodriguez-Martinez; Yuly Garcia; Fabio Andrade. Comparative and Cost Analysis of a Novel Predictive Power Ramp Rate Control Method: A Case Study in a PV Power Plant in Puerto Rico. Applied Sciences 2021, 11, 5766 .

AMA Style

Juan Patarroyo-Montenegro, Jesus Vasquez-Plaza, Omar Rodriguez-Martinez, Yuly Garcia, Fabio Andrade. Comparative and Cost Analysis of a Novel Predictive Power Ramp Rate Control Method: A Case Study in a PV Power Plant in Puerto Rico. Applied Sciences. 2021; 11 (13):5766.

Chicago/Turabian Style

Juan Patarroyo-Montenegro; Jesus Vasquez-Plaza; Omar Rodriguez-Martinez; Yuly Garcia; Fabio Andrade. 2021. "Comparative and Cost Analysis of a Novel Predictive Power Ramp Rate Control Method: A Case Study in a PV Power Plant in Puerto Rico." Applied Sciences 11, no. 13: 5766.

Review
Published: 04 June 2021 in IEEE Access
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In response to national and international carbon reduction goals, renewable energy resources like photovoltaics (PV) and wind, and energy storage technologies like fuel-cells are being extensively integrated in electric grids. All these energy resources require power electronic converters (PECs) to interconnect to the electric grid. These PECs have different response characteristics to dynamic stability issues compared to conventional synchronous generators. As a result, the demand for validated models to study and control these stability issues of PECs has increased drastically. This paper provides a review of the existing PEC model types and their applicable uses. The paper provides a description of the suitable model types based on the relevant dynamic stability issues. Challenges and benefits of using the appropriate PEC model type for studying each type of stability issue are also presented.

ACS Style

Chinmay Shah; Jesus D. Vasquez-Plaza; Daniel D. Campo-Ossa; Juan F. Patarroyo-Montenegro; Nischal Guruwacharya; Niranjan Bhujel; Rodrigo D. Trevizan; Fabio Andrade Rengifo; Mariko Shirazi; Reinaldo Tonkoski; Richard Wies; Timothy M. Hansen; Phylicia Cicilio. Review of Dynamic and Transient Modeling of Power Electronic Converters for Converter Dominated Power Systems. IEEE Access 2021, 9, 82094 -82117.

AMA Style

Chinmay Shah, Jesus D. Vasquez-Plaza, Daniel D. Campo-Ossa, Juan F. Patarroyo-Montenegro, Nischal Guruwacharya, Niranjan Bhujel, Rodrigo D. Trevizan, Fabio Andrade Rengifo, Mariko Shirazi, Reinaldo Tonkoski, Richard Wies, Timothy M. Hansen, Phylicia Cicilio. Review of Dynamic and Transient Modeling of Power Electronic Converters for Converter Dominated Power Systems. IEEE Access. 2021; 9 ():82094-82117.

Chicago/Turabian Style

Chinmay Shah; Jesus D. Vasquez-Plaza; Daniel D. Campo-Ossa; Juan F. Patarroyo-Montenegro; Nischal Guruwacharya; Niranjan Bhujel; Rodrigo D. Trevizan; Fabio Andrade Rengifo; Mariko Shirazi; Reinaldo Tonkoski; Richard Wies; Timothy M. Hansen; Phylicia Cicilio. 2021. "Review of Dynamic and Transient Modeling of Power Electronic Converters for Converter Dominated Power Systems." IEEE Access 9, no. : 82094-82117.

Journal article
Published: 06 November 2020 in IEEE Transactions on Power Electronics
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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 single-input single-output (SISO) controllers, the LQR-ORT controller increases robustness margins and reduces the quadratic value of the power error and control inputs during the 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 pro-posed. In addition, a methodology to develop an islanded microgrid model in a synchronous reference frame is proposed. Robustness analysis demonstrates the stability of the LQR-ORT controller under variations in the LCL filter components. Experimental results demonstrate the accuracy of the proposed model and the effectiveness of the LQR-ORT controller on improving transient response and robustness in islanded mode.

ACS Style

Juan F. Patarroyo-Montenegro; Fabio Andrade; Josep M. Guerrero; Juan C. Vasquez. A Linear Quadratic Regulator With Optimal Reference Tracking for Three-Phase Inverter-Based Islanded Microgrids. IEEE Transactions on Power Electronics 2020, 36, 7112 -7122.

AMA Style

Juan F. Patarroyo-Montenegro, Fabio Andrade, Josep M. Guerrero, Juan C. Vasquez. A Linear Quadratic Regulator With Optimal Reference Tracking for Three-Phase Inverter-Based Islanded Microgrids. IEEE Transactions on Power Electronics. 2020; 36 (6):7112-7122.

Chicago/Turabian Style

Juan F. Patarroyo-Montenegro; Fabio Andrade; Josep M. Guerrero; Juan C. Vasquez. 2020. "A Linear Quadratic Regulator With Optimal Reference Tracking for Three-Phase Inverter-Based Islanded Microgrids." IEEE Transactions on Power Electronics 36, no. 6: 7112-7122.

Journal article
Published: 25 September 2020 in Applied Sciences
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This work proposes a power control strategy based on the linear quadratic regulator with optimal reference tracking (LQR-ORT) for a three-phase inverter-based generator (IBG) using an LCL filter. The use of an LQR-ORT controller increases robustness margins and reduces the quadratic value of the power error and control inputs during transient response. A model in a synchronous reference frame that integrates power sharing and voltage–current (V–I) dynamics is also proposed. This model allows for analyzing closed-loop eigenvalue location and robustness margins. The proposed controller was compared against a classical droop approach using proportional-resonant controllers for the inner loops. Mathematical analysis and hardware-in-the-loop (HIL) experiments under variations in the LCL filter components demonstrate fulfillment of robustness and performance bounds of the LQR-ORT controller. Experimental results demonstrate accuracy of the proposed model and the effectiveness of the LQR-ORT controller in improving transient response, robustness, and power decoupling.

ACS Style

Juan F. Patarroyo-Montenegro; Jesus D. Vasquez-Plaza; Fabio Andrade; Lingling Fan. An Optimal Power Control Strategy for Grid-Following Inverters in a Synchronous Frame. Applied Sciences 2020, 10, 6730 .

AMA Style

Juan F. Patarroyo-Montenegro, Jesus D. Vasquez-Plaza, Fabio Andrade, Lingling Fan. An Optimal Power Control Strategy for Grid-Following Inverters in a Synchronous Frame. Applied Sciences. 2020; 10 (19):6730.

Chicago/Turabian Style

Juan F. Patarroyo-Montenegro; Jesus D. Vasquez-Plaza; Fabio Andrade; Lingling Fan. 2020. "An Optimal Power Control Strategy for Grid-Following Inverters in a Synchronous Frame." Applied Sciences 10, no. 19: 6730.

Journal article
Published: 25 June 2020 in Energies
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In this work, a synchronous model for grid-connected and islanded microgrids is presented. The grid-connected model is based on the premise that the reference frame is synchronized with the AC bus. The quadrature component of the AC bus voltage can be cancelled, which allows to express output power as a linear equation for nominal values in the AC bus amplitude voltage. The model for the islanded microgrid is developed by integrating all the inverter dynamics using a state-space model for the load currents. This model is presented in a comprehensive way such that it could be scalable to any number of inverter-based generators using inductor–capacitor–inductor (LCL) output filters. The use of these models allows designers to assess microgrid stability and robustness using modern control methods such as eigenvalue analysis and singular value diagrams. Both models were tested and validated in an experimental setup to demonstrate their accuracy in describing microgrid dynamics. In addition, three scenarios are presented: non-controlled model, Linear-Quadratic Integrator (LQI) power control, and Power-Voltage (PQ/Vdq) droop–boost controller. Experimental results demonstrate the effectiveness of the control strategies and the accuracy of the models to describe microgrid dynamics.

ACS Style

Juan F. Patarroyo-Montenegro; Jesus D. Vasquez-Plaza; Fabio Andrade. A State-Space Model of an Inverter-Based Microgrid for Multivariable Feedback Control Analysis and Design. Energies 2020, 13, 3279 .

AMA Style

Juan F. Patarroyo-Montenegro, Jesus D. Vasquez-Plaza, Fabio Andrade. A State-Space Model of an Inverter-Based Microgrid for Multivariable Feedback Control Analysis and Design. Energies. 2020; 13 (12):3279.

Chicago/Turabian Style

Juan F. Patarroyo-Montenegro; Jesus D. Vasquez-Plaza; Fabio Andrade. 2020. "A State-Space Model of an Inverter-Based Microgrid for Multivariable Feedback Control Analysis and Design." Energies 13, no. 12: 3279.