scholarly journals Optimization of Distribution Network Operation Based on Reconnection, Clossed-Loop Operation and Reactive Power Generation – A Case Study

2017 ◽  
Author(s):  
Matej Pintarič ◽  
Miran Rošer ◽  
Gorazd Štumberger
Keyword(s):  
Power Generation ◽  
Reactive Power ◽  
Distribution Network ◽  
Network Operation

scholarly journals Solar photovoltaic-based microgrid hosting capacity evaluation in electrical energy distribution network with voltage quality analysis

2021 ◽  
Vol 3 (5) ◽  
Author(s):  
Arvind Sharma ◽  
Mohan Kolhe ◽  
Alkistis Kontou ◽  
Dimitrios Lagos ◽  
Panos Kotsampopoulos
Keyword(s):  
Reactive Power ◽  
Distribution Network ◽  
Electrical Energy ◽  
Droop Control ◽  
Solar Photovoltaic ◽  
Voltage Profile ◽  
Power Conditioning ◽  
Network Operation ◽  
Hardware In Loop ◽  
Pv Penetration

Abstract In this paper, solar photovoltaic hosting capacity within the electrical distribution network is estimated for different buses, and the impacts of high PV penetration are evaluated using power hardware-in-loop testing methods. It is observed that the considered operational constraints (i.e. voltage and loadings) and their operational limits have a significant impact on the hosting capacity results. However, with increasing photovoltaic penetration, some of the network buses reach maximum hosting capacity, which affects the network operation (e.g. bus voltages, line loading). The results show that even distributing the maximum hosting capacity among different buses can increase the bus voltage rise to 9%. To maintain the network bus voltages within acceptable limits, reactive power voltage-based droop control is implemented in the photovoltaic conditioning devices to test the dynamics of the network operation. The results show that implementation of the droop control technique can reduce the maximum voltage rise from 9% to 4% in the considered case. This paper also presents the impact of forming a mesh type network (i.e. from radial network) on the voltage profile during PV penetration, and a comparative analysis of the operational performance of a mesh type and radial type electrical network is performed. It is observed that the cumulative effect of forming a mesh type network along with a droop control strategy can further improve the voltage profile and contribute to increase photovoltaic penetration. The results are verified using an experimental setup of digital real-time simulator and power hardware-in-loop test methods. The results from this work will be useful for estimating the appropriate photovoltaic hosting capacity within a distribution network and implementation of a droop control strategy in power conditioning devices to maintain the network operational parameters within the specified limits. Highlights Voltage and line loading constraints’ combination can reduce PV hosting capacity by 50% as compared to only voltage as a constraint. Implementation of reactive power versus voltage droop control in PV power conditioning device can reduce voltage variation from 9% to 4%. In a PV integrated electrical energy network, line loading can be reduced by 20% if the network is configured from radial to mesh type.

scholarly journals Photovoltaic Power Converter Management in Unbalanced Low Voltage Networks with Ancillary Services Support

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 972 ◽  
Author(s):  
Fermín Barrero-González ◽  
Victor Pires ◽  
José Sousa ◽  
João Martins ◽  
María Milanés-Montero ◽  
...  
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Power Converter ◽  
Maximum Energy ◽  
Practical Implementation ◽  
Network Operation ◽  
The Impact

The proliferation of residential photovoltaic (PV) prosumers leads to detrimental impacts on the low-voltage (LV) distribution network operation such as reverse power flow, voltage fluctuations and voltage imbalances. This is due to the fact that the strategies for the PV inverters are usually designed to obtain the maximum energy from the panels. The most recent approach to these issues involves new inverter-based solutions. This paper proposes a novel comprehensive control strategy for the power electronic converters associated with PV installations to improve the operational performance of a four-wire LV distribution network. The objectives are to try to balance the currents demanded by consumers and to compensate the reactive power demanded by them at the expense of the remaining converters’ capacity. The strategy is implemented in each consumer installation, constituting a decentralized or distributed control and allowing its practical implementation based on local measurements. The algorithms were tested, in a yearly simulation horizon, on a typical Portuguese LV network to verify the impact of the high integration of the renewable energy sources in the network and the effectiveness and applicability of the proposed approach.

Study on Reactive Support of Distributed Generation

2014 ◽  
Vol 490-491 ◽  
pp. 976-982
Author(s):  
Chen Fang ◽  
Ting Ting Xu ◽  
Jin Song Liu ◽  
Jia Chen ◽  
Zhi Gang Lu
Keyword(s):  
Distributed Generation ◽  
Reactive Power ◽  
Positive Impact ◽  
Control Strategies ◽  
Distribution Network ◽  
Operation Conditions ◽  
Compensation Device ◽  
The Stability ◽  
External Characteristics

As for renewable energy, the distributed generation (DG) technology has a promising outlook and is getting more concern in worldwide. In order to ensure the distribution network operate on the best performance when accessed by DG, DG must have a good reactive support for the distribution network. In this paper, the models of different DGs reactive power external characteristics are given. And in the modified case of IEEE37, the SVSA program which is developed by Tianjin University are used to analyze the reactive support of different DG. The case study shows that under some certain control strategies and operation conditions, when properly making use of the reactive support, the distribution network has a better performance in power loss and also has a positive impact on the stability and economical operation. Compare with traditional reactive power compensation device, the DG performs better in overall network voltage and economical operation of network.

scholarly journals Solutions to Increase PV Hosting Capacity and Provision of Services from Flexible Energy Resources

2020 ◽  
Vol 10 (15) ◽  
pp. 5146
Author(s):  
Hannu Laaksonen ◽  
Chethan Parthasarathy ◽  
Hossein Hafezi ◽  
Miadreza Shafie-khah ◽  
Hosna Khajeh ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Smart Grids ◽  
Reactive Power ◽  
Distribution Network ◽  
Energy Resources ◽  
Related Services ◽  
Control Functions ◽  
Provision Of Services ◽  
Network Operation ◽  
Technical Services

Future smart grids will be more dynamic with many variabilities related to generation, inertia, and topology changes. Therefore, more flexibility in form of several active and reactive power related technical services from different distributed energy resources (DER) will be needed for local (distribution network) and whole system (transmission network) needs. However, traditional distribution network operation and control principles are limiting the Photovoltaic (PV) hosting capacity of LV networks and the DER capability to provide system-wide technical services in certain situations. New active and adaptive control principles are needed in order to overcome these limitations. This paper studies and proposes solutions for adaptive settings and management schemes to increase PV hosting capacity and improve provision of frequency support related services by flexible energy resources. The studies show that unwanted interactions between different DER units and their control functions can be avoided with the proposed adaptive control methods. Simultaneously, also better distribution network PV hosting capacity and flexibility services provision from DER units even during very low load situations can be achieved.

scholarly journals Optimal Allocation and Planning of Distributed Power Generation Resources in a Smart Distribution Network Using the Manta Ray Foraging Optimization Algorithm

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4856
Author(s):  
Masoud Zahedi Vahid ◽  
Ziad M. Ali ◽  
Ebrahim Seifi Najmi ◽  
Abdollah Ahmadi ◽  
Foad H. Gandoman ◽  
...  
Keyword(s):  
Power Generation ◽  
Optimal Allocation ◽  
Distribution Network ◽  
Energy Losses ◽  
Voltage Profile ◽  
Distributed Power Generation ◽  
Load Demand ◽  
Network Operation ◽  
Smart Distribution Network ◽  
Manta Ray

In this study, optimal allocation and planning of power generation resources as distributed generation with scheduling capability (DGSC) is presented in a smart environment with the objective of reducing losses and considering enhancing the voltage profile is performed using the manta ray foraging optimization (MRFO) algorithm. The DGSC refers to resources that can be scheduled and their generation can be determined based on network requirements. The main purpose of this study is to schedule and intelligent distribution of the DGSCs in the smart and conventional distribution network to enhance its operation. First, allocation of the DGSCs is done based on weighted coefficient method and then the scheduling of the DGSCs is implemented in the 69-bus distribution network. In this study, the effect of smart network by providing real load in minimizing daily energy losses is compared with the network includes conventional load (estimated load as three-level load). The simulation results cleared that optimal allocation and planning of the DGSCs can be improved the distribution network operation with reducing the power losses and also enhancing the voltage profile. The obtained results confirmed superiority of the MRFO compared with well-known particle swarm optimization (PSO) in the DGSCs allocation. The results also showed that increasing the number of DGSCs reduces more losses and improves more the network voltage profile. The achieved results demonstrated that the energy loss in smart network is less than the network with conventional load. In other words, any error in forecasting load demand leads to non-optimal operating point and more energy losses.

The Design and Implementation of an Integrated Distribution Automation Scheme

2012 ◽  
Vol 241-244 ◽  
pp. 1942-1946
Author(s):  
Zhi Hong Liu ◽  
Jian Wei Zhang ◽  
Xiang Zhao ◽  
Fang Yang
Keyword(s):  
Power Supply ◽  
Reactive Power ◽  
Distribution Network ◽  
Distribution Automation ◽  
Automation System ◽  
Network Operation ◽  
On Line ◽  
Network Fault ◽  
Compensation Function

According to the statistic of the distribution network operation, distribution network fault is generally located on line branch, rather than the main line. In view of the structure and characteristics of the current distribution automation system, combining the distribution network reformation and construction practice, this paper puts a comprehensive distribution automation solution that the branch line is equipped with distribution automation terminal which integrates protection and reactive power compensation function. It can achieve the rapid isolation of the distribution network failures and the power supply reliability, and dynamically improve the quality of power supply.

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