LPPT Control of a Dual-Stage Grid Connected Multi-String Photovoltaic System

2017 ◽  
Author(s):  
M. Kranthi Kumar Reddy ◽  
Vaskar Sarkar
Keyword(s):  
Photovoltaic System ◽  
Dual Stage

Tree growth optimization based control of grid-tied PV system

2021 ◽  
Keyword(s):  
Tree Growth ◽  
Photovoltaic System ◽  
Matlab Simulation ◽  
Pv System ◽  
Dynamic Conditions ◽  
Growth Optimization ◽  
Dual Stage ◽  
Integral Controller ◽  
Minimum Variation ◽  
Bus Voltage

Abstract This paper presents a tree growth optimization based control of a grid-tied dual-stage photovoltaic system. The tree growth optimization has been employed for optimizing the proportional and integral controller gains for direct current bus voltage (V dc ) regulation to have minimum variation during dynamic conditions and to generate an accurate loss component of current (i Loss ). The accurate , further enhance the control's performance by generating the accurate reference currents. The presented system is simulated and analyzed in a MATLAB simulation environment under various dynamic conditions, i.e., irradiation variation, unbalanced and abnormal grid voltage. The overall performance is satisfactory as per IEEE 519 standards.

Control of Grid Connected Photovoltaic System Using Three-Level T-Type Inverter

2016 ◽  
Vol 17 (4) ◽  
pp. 377-384 ◽  
Author(s):  
Abdelmalik Zorig ◽  
Mohammed Belkeiri ◽  
Said Barkat ◽  
Abdelhamid Rabhi
Keyword(s):  
Reactive Power ◽  
Reactive Power Compensation ◽  
Operating Conditions ◽  
Photovoltaic System ◽  
Switching Losses ◽  
Dual Stage ◽  
Vector Modulation ◽  
Effective Use ◽  
Balancing Control

Abstract Three-level T-Type inverter (3LT2I) topology has numerous advantageous compared to three-level neutral-point-clamped (NPC) inverter. The main benefits of 3LT2I inverter are the efficiency, inverter cost, switching losses, and the quality of output voltage waveforms. In this paper, a photovoltaic distributed generation system based on dual-stage topology of DC-DC boost converter and 3LT2I is introduced. To that end, a decoupling control strategy of 3LT2I is proposed to control the current injected into the grid, reactive power compensation, and DC-link voltage. The resulting system is able to extract the maximum power from photovoltaic generator, to achieve sinusoidal grid currents, and to ensure reactive power compensation. The voltage-balancing control of two split DC capacitors of the 3LT2I is achieved using three-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The proposed system performance is investigated at different operating conditions.

scholarly journals Equivalent Input Disturbance-Based Control Design for Three Phase Dual-Stage Grid-Tied Photovoltaic System Considering Dead Time Effect

2021 ◽  
Vol 9 ◽  
Author(s):  
Fang Liu ◽  
Zhen Fan ◽  
Qianyi Liu ◽  
Runmin Zou
Keyword(s):  
Dead Time ◽  
Current Control ◽  
Time Effect ◽  
Photovoltaic System ◽  
Input Disturbance ◽  
Three Phase ◽  
Dual Stage ◽  
Equivalent Input Disturbance ◽  
Pv Grid ◽  
A Current

Grid-tied inverter is the prominent component of the three-phase dual-stage photovoltaic (PV) grid-tied power generation system. However, the disturbances caused by dead time effect will pose the reduction of grid-tied current quality and even cause the imbalance of inverter itself or other circuit devices. In this paper, a current control strategy is proposed to damp dead time effect for the three-phase dual-stage PV grid-tied inverter system, and its design, stability analysis, and implementation are carried out. First, the inverter model is modified by regarding the dq reference frame coupling terms, uncertainties, and external and internal disturbances as an unknown lumped disturbance. Then, a current control scheme based on compensation of equivalent input disturbance is introduced, and it estimates and compensates the unknown lumped disturbance, which effectively realizes the inverter model decoupling and comprehensive disturbance rejection. Last, simulation results demonstrate the effectiveness and superiority of the proposed current controller.

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