scholarly journals Novel islanding detection method for inverter-based distributed generators based on adaptive reactive power control

2019 ◽  
Vol 2019 (17) ◽  
pp. 3890-3894 ◽  
Author(s):  
Xiaolong Chen ◽  
Xinyi Wang ◽  
Jie Jian ◽  
Zhiyao Tan ◽  
Yongli Li ◽  
...  
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Detection Method ◽  
Islanding Detection ◽  
Reactive Power Control ◽  
Distributed Generators

scholarly journals A Machine Learning Approach for Coordinated Voltage and Reactive Power Control

2020 ◽  
Vol 18 (1) ◽  
pp. 54-60
Author(s):  
Worawat Nakawiro
Keyword(s):  
Machine Learning ◽  
Power Control ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Distribution Networks ◽  
Classification Problem ◽  
Reactive Power Control ◽  
Network Information ◽  
Distributed Generators ◽  
Multi Class Classification

Increasing penetration of renewable energy sources in form of distributed generators has brought many technical challenges to distribution networks. Among those, voltage and reactive power control should be revised and improved. Existing and new control resources should be coordinated based on real-time information and in closed loop. To achieve this, machine learning (ML) can be used to map the relationship between the selected network information and the desired control output. In this paper, setting of the shunt compensator operating in capacitive or inductive modes is coordinated with the tap position of substation transformer by the developed ML. Dataset emulating network behaviour during a year operation is constructed for training ML. A multi-class classification problem is formulated. Simulation results show satisfactory accuracy for some classes.

scholarly journals Islanding Detection of Synchronous Distributed Generator Based on the Active and Reactive Power Control Loops

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2819 ◽  
Author(s):  
Reza Zamani ◽  
Mohamad-Esmail Hamedani-Golshan ◽  
Hassan Haes Alhelou ◽  
Pierluigi Siano ◽  
Hemanshu R. Pota
Keyword(s):  
Power Control ◽  
Power Quality ◽  
Reactive Power ◽  
Islanding Detection ◽  
Reactive Power Control ◽  
Detection Scheme ◽  
Stability Margins ◽  
Control Loops ◽  
Active And Reactive Power ◽  
The Stability

There has been a considerable importance for the islanding detection due to the growing integration of distributed generations (DGs) in the modern power grids. This paper proposes a novel active islanding detection scheme for synchronous DGs, considering two additional compensators and a positive feedback for each of active and reactive power control loops. The added blocks are designed using the small gain theorem and stability margins definition considering characteristics of open loop transfer functions of synchronous DG control loops. Islanding can be detected using the proposed method even where there is an exact match between generation and local load without sacrificing power quality. In addition, the performance of the proposed method can be retained even with high penetration of motor loads. The proposed scheme improves the stability and power quality of the grid, when the synchronous DG is subjected to the grid-connected disturbances. Furthermore, this method augments the stability margins of the system in the grid-connected conditions to enhance the disturbances ride-through capability of the system and reduce the negative impact of the active methods on the power quality. Simultaneous advantages of the proposed scheme are demonstrated by modeling a test system in MATLAB software and time-domain simulation achieved by PSCAD.

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