Composite Islanding Detection Method of Grid-Connected Photovoltaic Generation System

2013 ◽  
Vol 339 ◽  
pp. 574-578
Author(s):  
Guo Zhao ◽  
Xue Liang Huang
Keyword(s):  
Detection Method ◽  
Islanding Detection ◽  
Generation System ◽  
Photovoltaic Generation ◽  
Three Phase ◽  
Reactive Current ◽  
Environment Simulation ◽  
Simulation Results ◽  
Pv Generation ◽  
Three Phase Inverter

Islanding detection is an important issue for grid-connected photovoltaic (PV) generation systems. The paper puts forward a new composite islanding detection method combining active current disturbance and reactive current disturbance. This islanding detection method for three-phase inverter is simulated in the Matlab/Simulink environment. Simulation results show that, when the inverter output and the load power are balanced, the new islanding detection method can detect islanding quickly with little influence on the power quality.

Hybrid photovoltaic generation system with novel islanding detection method

2014 ◽  
Vol 106 ◽  
pp. 101-108 ◽  
Author(s):  
Jia-Min Shen ◽  
Hurng-Liahng Jou ◽  
Jinn-Chang Wu ◽  
Kuen-Der Wu
Keyword(s):  
Detection Method ◽  
Islanding Detection ◽  
Generation System ◽  
Photovoltaic Generation

Application of Cascaded Multilevel Inverter for High Voltage Grid-Connected PV System

2015 ◽  
Vol 1092-1093 ◽  
pp. 17-21
Author(s):  
Yi Dan Li ◽  
Du Ting Wang ◽  
Hong Ming Kang ◽  
Hong Fang Ru
Keyword(s):  
Multilevel Inverter ◽  
Operating Voltage ◽  
Generation System ◽  
Pv System ◽  
Photovoltaic Generation ◽  
In Series ◽  
Simulation Results ◽  
High Level ◽  
Pv Generation ◽  
Cascaded Multilevel Inverter

The cascaded multilevel inverter may be the best topology to satisfy continuously increasing capacity and scale of grid-connected photovoltaic generation system due to its modularized circuit layout and sufficiently high operating voltage without devices in series. The operating principle of the cascaded multilevel inverter is presented. The control strategy of carrier phase shift PWM is proposed and discussed in detail. A grid-connected photovoltaic (PV) generation system based on a seven level cascaded inverter is provided. Simulation model of a seven level cascaded inverter with phase shifted PWM is built in Simulink environment and simulation results verify that the cascaded multilevel inverter can output high level voltage without devices in series, reduce harmonics, and output high quality waveforms.

scholarly journals Improved Three-Phase AFD Islanding Detection Based on Digital Control and Non-Detection Zone Elimination

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2421
Author(s):  
Xinxin Zheng ◽  
Rui Zhang ◽  
Xi Chen ◽  
Nong Sun
Keyword(s):  
Control System ◽  
Phase Angle ◽  
Digital Control ◽  
Detection Method ◽  
Frequency Drift ◽  
Phase System ◽  
Islanding Detection ◽  
Detection Zone ◽  
Three Phase ◽  
Three Phase Inverter

This paper proposes an improved active frequency drift (AFD) islanding detection method of a three-phase inverter. Different than the existing single-phase AFD method, in the three-phase system, the disturbance is added to the phase angle, which takes part in coordinate transformation calculations. Thus, the frequency drift of the three-phase reference current can be realized by the disturbance of the phase angle. It is unnecessary to add frequency drift to each phase respectively with the proposed method, which can simplify the control system. Furthermore, the non-detection zone can be eliminated by updating certain parameters; therefore, the detection method is sensitive. In this paper, the application of the proposed method in a digital control system is discussed in detail. The non-detection zone is analyzed, and an elimination method is proposed. Finally, the simulation and experimental results are given to verify the theoretical analysis.

Active islanding detection method for the grid-connected photovoltaic generation system

2010 ◽  
Vol 80 (4) ◽  
pp. 372-379 ◽  
Author(s):  
Wen-Jung Chiang ◽  
Hurng-Liahng Jou ◽  
Jinn-Chang Wu ◽  
Kuen-Der Wu ◽  
Ya-Tsung Feng
Keyword(s):  
Detection Method ◽  
Islanding Detection ◽  
Generation System ◽  
Photovoltaic Generation

scholarly journals Over/Undervoltage and Undervoltage Shift of Hybrid Islanding Detection Method of Distributed Generation

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Manop Yingram ◽  
Suttichai Premrudeepreechacharn
Keyword(s):  
Control System ◽  
Distributed Generation ◽  
Hybrid Method ◽  
Detection Method ◽  
System Simulation ◽  
Detection Methods ◽  
Islanding Detection ◽  
Active Method ◽  
Passive Method ◽  
Simulation Results

The mainly used local islanding detection methods may be classified as active and passive methods. Passive methods do not perturb the system but they have larger nondetection zones, whereas active methods have smaller nondetection zones but they perturb the system. In this paper, a new hybrid method is proposed to solve this problem. An over/undervoltage (passive method) has been used to initiate an undervoltage shift (active method), which changes the undervoltage shift of inverter, when the passive method cannot have a clear discrimination between islanding and other events in the system. Simulation results on MATLAB/SIMULINK show that over/undervoltage and undervoltage shifts of hybrid islanding detection method are very effective because they can determine anti-islanding condition very fast.ΔP/P>38.41% could determine anti-islanding condition within 0.04 s;ΔP/P<-24.39% could determine anti-islanding condition within 0.04 s;-24.39%≤ΔP/P≤ 38.41% could determine anti-islanding condition within 0.08 s. This method perturbed the system, only in the case of-24.39% ≤ΔP/P ≤38.41% at which the control system of inverter injected a signal of undervoltage shift as necessary to check if the occurrence condition was an islanding condition or not.

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