A cost-effective power ramp-rate control strategy for single-phase two-stage grid-connected photovoltaic systems

The paper proposes a AC and DC mixed output VPS(vehicle power supply). It is composed of a two-stage circuit with the input stage and the output stage. The input stage contains a single-phase PWM inverter, a HFT (high-frequency transformer) and an uncontrolled rectifier. The single-phase PWM inverter adopts the open-loop control strategy to convert the low DC voltage into a high-frequency one with square wave. The HFT enhances the voltage and insulates the low-voltage side from the high-voltage side. The uncontrolled rectifier transforms the square voltage into DC voltage. In the output stage, one output uses single-phase PWM inverter and the other uses a DC chopper, both of which adopt the double-loop PWM control mode. The mode consists of an outer voltage loop and an inner current loop to produce desirable voltage and power. With the two-stage control strategy, ideal output currents and the output voltages are obtained, and the input power factor is controllable. The VPS model is established on MATLAB/SIMULINK, and this system is also implemented in laboratory based on DSP TMS320F28335. The results of simulation and experiment verify the proposed VPS system.

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Lyapunov-Based Control Strategy for a Multi-Function Single-Phase Inverter for Photovoltaic Systems

2018 14th International Conference on Power Electronics (CIEP) ◽

10.1109/ciep.2018.8573436 ◽

2018 ◽

Cited By ~ 1

Author(s):

D. Palomares ◽

C. Hernandez ◽

J. vaquero ◽

N. Vazquez ◽

H. Lopez

Keyword(s):

Control Strategy ◽

Single Phase ◽

Photovoltaic Systems ◽

Phase Inverter ◽

Single Phase Inverter

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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 ◽

10.3390/app11135766 ◽

2021 ◽

Vol 11 (13) ◽

pp. 5766

Author(s):

Juan F. Patarroyo-Montenegro ◽

Jesus D. Vasquez-Plaza ◽

Omar F. Rodriguez-Martinez ◽

Yuly V. Garcia ◽

Fabio Andrade

Keyword(s):

Puerto Rico ◽

Power Plant ◽

Control Strategy ◽

Rate Control ◽

Control Method ◽

Real Data ◽

Control Methods ◽

Ramp Rate ◽

Proposed Model ◽

One Year

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.

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