scholarly journals Stochastic Optimization of PQ Powers at the Interface between Distribution and Transmission Grids

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4057
Author(s):  
Jérôme Buire ◽  
Frédéric Colas ◽  
Jean-Yves Dieulot ◽  
Xavier Guillaud
Keyword(s):  
Reactive Power ◽  
Daily Basis ◽  
Control Effort ◽  
Control Laws ◽  
Medium Voltage ◽  
Distributed Generators ◽  
Real Size ◽  
Grid Codes ◽  
Distribution Grids ◽  
Hourly Basis

This paper addresses the volt-var control of distribution grids embedding many distributed generators (DGs). Specifically, it focuses on the compliance of powers to specified PQ diagrams at the high voltage/medium voltage (HV/MV) interface while the voltages remain well controlled. This is achieved using a two-stage optimization corresponding to two different classes of actuators. The tap position of capacitor banks is selected on a daily basis, given a stochastic model of the input powers prediction, which allows infrequent actuation and increases the device lifespan. In a second stage, a confidence level optimization problem allows to tune on an hourly basis the parameters of the DGs reactive power affine control laws. Results on a real-size grid show that the combined tuning of these actuators allows the ability to comply with European grid codes while the control effort remains reasonable.

scholarly journals A review of voltage and reactive power control algorithms in medium voltage distribution networks

2021 ◽  
Vol 897 (1) ◽  
pp. 012016
Author(s):  
S Šantaras
Keyword(s):  
Distributed Generation ◽  
Power Loss ◽  
Reactive Power ◽  
Heuristic Algorithms ◽  
Distribution Networks ◽  
Active Power ◽  
Control Methods ◽  
Power Network ◽  
Medium Voltage ◽  
Distributed Generators

Abstract Current power network was built in mind that there will be mostly one-way power transmission, but as there is increasing penetration of distributed generation (DG), power network evolves and changes. Thereof old control strategies and algorithms used in power distribution do not fully utilize ever evolving power network in ensuring minimum active power loses, best distribution power generation for optimal voltage and frequency control. The main objective of this paper is review and comparison of heuristic algorithms in medium-voltage (MV) distribution networks with high distributed generation (DG) penetration. The specific goal is integrating reviewed algorithms in distributer power network control to minimise power loss, control active and reactive power flow between transmission and distribution power networks and utilization of current power network structure with growing number distributed generation penetration and thus minimizing required cost for its upgrade. Due to complexity of different power network structures and control methods used in managing it, algorithms are reviewed used in ensuring fast and reliable calculations by guaranteeing as minimum active power loss as possible and by improving power system performance over existing centralised as well as decentralised control methods. For both control methods distributed generators requires to be endowed with communication capabilities, as it is effective in driving the voltages within the admissible intervals and, additionally, it exploits the cooperation among the distributed generators and controllers to reach power network objectives of minimal power loss, voltage stability as mentioned before.

scholarly journals Novel Approach to Collect and Process Power Quality Data in Medium-Voltage Distribution Grids

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 460
Author(s):  
Sergei Kryltcov ◽  
Aleksei Makhovikov ◽  
Mariia Korobitcyna
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Quality Data ◽  
Processing Plant ◽  
Grid Node ◽  
Voltage Distribution ◽  
Nonlinear Load ◽  
Medium Voltage ◽  
Harmonic Components ◽  
Distribution Grids

The paper is devoted to the development of the structure of a fast and flexible data collecting system based on the proposed approach to measure power quality indicators in three-phase medium-voltage distribution grids with an example of a Mikhailovsky mining and processing plant. The approach utilizes the properties of a space vector, obtained from grid currents and voltages with disturbed waveform, to allow faster extraction of the harmonic components compared to traditional approaches, based on the direct Fourier-transform applied to a line or phase values. During the study, the concept of a universal measurement device was introduced, which allows fast estimation of the following values at the grid node: magnitudes and phases of voltage and current harmonic components, active and reactive power of harmonics and fundamental components, positive and negative instantaneous powers. The structure of interconnected measurement and control units for the considered grid node with simultaneous operation of two active variable frequency drives with active rectifiers was proposed in accordance with a concept of the Internet of things. The benefits of the proposed solution are shown by the example of the model of the grid node with two operating draglines and nonlinear load, which was developed in MATLAB/Simulink software. The proposed approach was utilized to produce distributed references for control systems of grid inverters to compensate nonlinear currents, which allowed to significantly improve THDi of the grid node input power.

scholarly journals Improving PV Resilience by Dynamic Reconfiguration in Distribution Grids: Problem Complexity and Computation Requirements

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 830
Author(s):  
Filipe F. C. Silva ◽  
Pedro M. S. Carvalho ◽  
Luís A. F. M. Ferreira
Keyword(s):  
Distributed Generation ◽  
Optimal Solution ◽  
Dynamic Reconfiguration ◽  
Scheduling Problem ◽  
Low Carbon ◽  
Distribution Grid ◽  
Medium Voltage ◽  
Classical Computing ◽  
The Impact ◽  
Distribution Grids

The dissemination of low-carbon technologies, such as urban photovoltaic distributed generation, imposes new challenges to the operation of distribution grids. Distributed generation may introduce significant net-load asymmetries between feeders in the course of the day, resulting in higher losses. The dynamic reconfiguration of the grid could mitigate daily losses and be used to minimize or defer the need for network reinforcement. Yet, dynamic reconfiguration has to be carried out in near real-time in order to make use of the most updated load and generation forecast, this way maximizing operational benefits. Given the need to quickly find and update reconfiguration decisions, the computational complexity of the underlying optimal scheduling problem is studied in this paper. The problem is formulated and the impact of sub-optimal solutions is illustrated using a real medium-voltage distribution grid operated under a heavy generation scenario. The complexity of the scheduling problem is discussed to conclude that its optimal solution is infeasible in practical terms if relying upon classical computing. Quantum computing is finally proposed as a way to handle this kind of problem in the future.

DC-Link Voltage Balancing Strategy Based on SVM and Reactive Power Exchange for a 5L-MPC Back-to-Back Converter for Medium-Voltage Drives

2016 ◽  
Vol 63 (12) ◽  
pp. 7864-7875 ◽  
Author(s):  
Mikel Mazuela ◽  
Igor Baraia ◽  
Alain Sanchez-Ruiz ◽  
Ivan Echeverria ◽  
Inigo Torre ◽  
...  
Keyword(s):  
Reactive Power ◽  
Voltage Balancing ◽  
Medium Voltage ◽  
Power Exchange

Effect of Feedback Control on the Power Consumption of Induced-Strain Actuators

2000 ◽  
Author(s):  
Sriram Chandrasekaran ◽  
Douglas K. Lindner ◽  
Don Leo
Keyword(s):  
Structural Control ◽  
Power Flow ◽  
Reactive Power ◽  
Flow Characteristics ◽  
Control Laws ◽  
The Real ◽  
Reactive Power Flow ◽  
Flow Through ◽  
Sinusoidal Disturbance ◽  
A Current

Abstract In this paper we study the closed loop power flow characteristics between a controlled piezoelectric actuator and a current controlled drive amplifier for two different structural control laws. We determine the real and reactive power flow through the structure and actuator into the amplifier when the structure is excited with a sinusoidal disturbance force under both control laws. The dependence of the real and reactive components of the power on the material properties of the actuator, structure and the configuration of the controller is presented. These real and reactive power estimates are useful for sizing the drive amplifier for the actuator.

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