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 Heuristic Coordinated Voltage Control Schemes in Distribution Network with Distributed Generations

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2849
Author(s):  
Seok-Il Go ◽  
Sang-Yun Yun ◽  
Seon-Ju Ahn ◽  
Hyun-Woo Kim ◽  
Joon-Ho Choi
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Voltage Control ◽  
Distribution Networks ◽  
Control Voltage ◽  
Reactive Power Control ◽  
Distributed Generations ◽  
Control Scheme ◽  
Control Devices ◽  
Node Voltage

The voltage and reactive power control (Volt/VAR Control, VVC) in distribution networks has become a challenging issue with the increasing utilization of distributed generations (DGs). In this paper, a heuristic-based coordinated voltage control scheme that considers distribution voltage control devices, i.e., on-load tap changers (OLTC) and step voltage regulators (SVR), as well as reactive power control devices, i.e., DGs, are proposed. Conventional voltage control methods using non-linear node voltage equations require complex computation. In this paper, the formulation of simplified node voltage equations accounting for changes in tap position of distribution voltage control devices and reactive power changes of reactive power control devices are presented. A heuristic coordinated voltage control scheme using the proposed simplified node voltage equations is proposed. A coordinated voltage control scheme to achieve voltage control for nominal voltage and conservative voltage reduction (CVR) is presented. The results of the proposed schemes are compared with the results from the quadratic optimization method to confirm that the proposed schemes yields suitably similar results. Furthermore, a tap scheduling method is proposed to reduce the number of tap changes while controlling network voltage. The tap position is readjusted using a voltage control performance index (PI). Simulation results confirm that when using this method the number of tap changes is reduced. The proposed scheme not only produces reasonable performance in terms of control voltage of networks but also reduces the number of tap changes made by OLTC. The proposed control method is an alternative candidate for a system to be applied to practical distribution networks due to its simplified calculations and robust performance.

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 Enhancement of Power System Transient Stability by Active and Reactive Power Control of Variable Speed Wind Generators

2020 ◽  
Vol 10 (24) ◽  
pp. 8874
Author(s):  
Masaki Yagami ◽  
Masanori Ichinohe ◽  
Junji Tamura
Keyword(s):  
Kinetic Energy ◽  
Power System ◽  
Power Control ◽  
Wind Farm ◽  
Transient Stability ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Variable Speed ◽  
Pv System ◽  
Reactive Power Control

This paper proposes a novel control method for enhancing transient stability by using renewable energy sources (RES). The kinetic energy accumulated in a rotor of variable speed wind generator (VSWG) is proactively used as the active power source, which is controlled according to the frequency measured at the wind farm. In addition, coordinated reactive power control according to the grid voltage is also carried out to more effectively use the kinetic energy of the VSWG. The effects of the proposed control system were evaluated by simulation analyses performed using a modified IEEE nine-bus power system network made up of synchronous generators (SGs), a photovoltaic (PV) system and a VSWG-based wind farm. Furthermore, the coordinated reactive power control between the VSWG and PV system was also demonstrated.

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