Recurrent Fuzzy Cerebellar Model Articulation Neural Network Based Power Control of a Single-Stage Three-Phase Grid-Connected Photovoltaic System During Grid Faults

This study presents a new active and reactive power control scheme for a single-stage three-phase grid-connected photovoltaic (PV) system during grid faults. The presented PV system utilizes a single-stage three-phase current-controlled voltage-source inverter to achieve the maximum power point tracking (MPPT) control of the PV panel with the function of low voltage ride through (LVRT). Moreover, a formula based on positive sequence voltage for evaluating the percentage of voltage sag is derived to determine the ratio of the injected reactive current to satisfy the LVRT regulations. To reduce the risk of overcurrent during LVRT operation, a current limit is predefined for the injection of reactive current. Furthermore, the control of active and reactive power is designed using a two-dimensional recurrent fuzzy cerebellar model articulation neural network (2D-RFCMANN). In addition, the online learning laws of 2D-RFCMANN are derived according to gradient descent method with varied learning-rate coefficients for network parameters to assure the convergence of the tracking error. Finally, some experimental tests are realized to validate the effectiveness of the proposed control scheme.

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Three Phase Grid Connected Photovoltaic System with Active and Reactive Power Control Using “Instantaneous Reactive Power Theory”

Renewable Energy and Power Quality Journal ◽

10.24084/repqj08.591 ◽

2010 ◽

Vol 1 (08) ◽

pp. 1086-1091 ◽

Cited By ~ 9

Author(s):

G. Adamidis ◽

G. Tsengenes ◽

K. Kelesidis

Keyword(s):

Power Control ◽

Reactive Power ◽

Photovoltaic System ◽

Reactive Power Control ◽

Power Theory ◽

Instantaneous Reactive Power Theory ◽

Active And Reactive Power ◽

Three Phase ◽

Instantaneous Reactive Power

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Modeling and Design of the Vector Control for a Three-Phase Single-Stage Grid-Connected PV System with LVRT Capability according to the Spanish Grid Code

Energies ◽

10.3390/en12152899 ◽

2019 ◽

Vol 12 (15) ◽

pp. 2899 ◽

Cited By ~ 7

Author(s):

Alexis B. Rey-Boué ◽

N. F. Guerrero-Rodríguez ◽

Johannes Stöckl ◽

Thomas I. Strasser

Keyword(s):

Vector Control ◽

Reactive Power ◽

Low Voltage ◽

Single Stage ◽

Photovoltaic System ◽

Lookup Table ◽

Voltage Sags ◽

Pv System ◽

Low Voltage Ride Through ◽

Three Phase

This article deals with the vector control in dq axes of a three-phase grid-connected photovoltaic system with single-stage topology and low-voltage-ride-through capability. The photovoltaic generator is built using an array of several series-parallel Suntech PV modules and is modeled as a Lookup Table (two-dimensional; 2-D). The requirements adopted when grid voltage sags occur are based in both the IEC 61400-21 European normative and the allowed amount of reactive power to be delivered according to the Spanish grid code, which avoids the disconnection of the inverter under grid faults by a limitation in the magnitude of the three-phase output inverter currents. For this, the calculation of the positive- and negative-sequences of the grid voltages is made and a conventional three-phase Phase-Locked Loop is used for the inverter-grid synchronization, allowing the control of the active and reactive powers solely with the dq components of the inverter currents. A detailed enhanced flowchart of the control algorithm with low-voltage-ride-through capability is presented and several simulations and experiments using Matlab/SIMULINK and the Controller Hardware-in-the-Loop simulation technique, respectively, are run for several types of one- and three-phase voltage sags in order to validate its behavior.

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