Grid-Connected Photovoltaic System Based on Tapped-Inductor Quasi-Z-Source Inverter and Its Low Voltage Ride-Through Control Strategy

2018 ◽  
Author(s):  
Sun Bo ◽  
Zhao Chengbin ◽  
Zhang Hua ◽  
Xie Bangpeng ◽  
Xu Chengji ◽  
...  
Keyword(s):  
Control Strategy ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Low Voltage Ride Through

Control Strategy of Low Voltage Ride-Through for Grid-Connected Photovoltaic Power System Based on Predictive Current

2014 ◽  
Vol 556-562 ◽  
pp. 1753-1756
Author(s):  
Ming Guang Zhang ◽  
Xiao Jing Chen
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Stable Operation ◽  
Voltage Sags ◽  
Low Voltage Ride Through ◽  
Pv Inverter ◽  
Current Instruction ◽  
Voltage Recovery

The control strategy based on predictive current is proposed to solve problems that destruct stable operation of grid-connected photovoltaic system during asymmetrical fall. A mathematical model of PV inverter is established to calculate current instruction; a method of tracking based on predictive current is proposed to reduce the fluctuations of 2 times frequency. In the meantime, PV inverter provides reactive power to support voltage recovery according to the depth of grid voltage sags and realize LVRT. The result also shows that the proposed control strategy can reduce wave of DC voltage and provide reactive power to support voltage recovery.

scholarly journals Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

2019 ◽  
Vol 9 (3) ◽  
pp. 1524
Author(s):  
Haval Sardar Kamil ◽  
Dalila Mat Said ◽  
Mohd Wazir Mustafa ◽  
Mohammad Reza Miveh ◽  
Nasarudin Ahmad
Keyword(s):  
Control Strategy ◽  
Power Plants ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Electrical Grid ◽  
Low Voltage Ride Through ◽  
Power Stations ◽  
Pv Inverter ◽  
Synchronous Reference Frame ◽  
Three Phase

With the innovative progresses in power electronics in recent years, photovoltaic (PV) systems emerged as one of the promising sources for electricity generation at the distribution network. Nonetheless, connection of PV power plants to the utility grid under abnormal conditions has become a significant issue and novel grid codes should be recommend. The low-voltage ride-through (LVRT) capability is one of the challenges faced by the integration of PV power stations into electrical grid under abnormal conditions. This work firstly provides a discussion on recent control schemes for PV power plants to enhance the LVRT capabilities. Next, a control scheme for a three-phase four-leg grid-connected PV inverter under unbalanced grid fault conditions using synchronous reference frame proportional integral (SRFPI) controller is proposed. Simulation studies are performed to investigate the influence of the control strategy on the PV inverter.

Strategy for Reactive Control in Symmetrical Low Voltage Ride through of Photovoltaic System

2014 ◽  
Vol 602-605 ◽  
pp. 2820-2823
Author(s):  
Ju Bo Wang ◽  
Wen Li Xu ◽  
Wei Bao ◽  
Pan Zhang
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Reactive Control ◽  
Low Voltage Ride Through ◽  
Power Decoupling ◽  
Simulation And Experiment ◽  
System Output ◽  
New Type

The active and reactive power decoupling control of photovoltaic system is analyzed in this paper. The DC-DC and DC-AC two level photovoltaic inverter model are built on the RTDS. A new type LVRT control strategy about photovoltaic system is proposed. In the symmetrical grid drop fault case, photovoltaic system output reactive power to support the grid voltage recovering and save reactive power equipment. The feasibility and effectiveness of the control strategy is verified by simulation and experiment on the RTDS.

Study on an Advanced Low Voltage Ride-Through Control Strategy of Energy Router

2021 ◽  
Author(s):  
Xuefeng Qiao ◽  
Lei Chen ◽  
Jingguang Tang ◽  
Meng Ding ◽  
Zekai Zhao
Keyword(s):  
Control Strategy ◽  
Low Voltage ◽  
Low Voltage Ride Through

scholarly journals 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 ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2899 ◽  
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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