scholarly journals Analytical Assessment of DC Components Generated by Renewable Energy Resources with Inverter-Based Interconnection System due to Even Harmonics

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Marios N. Moschakis ◽  
Vasilis V. Dafopoulos ◽  
Emmanuel S. Karapidakis ◽  
Antonis G. Tsikalakis
Keyword(s):  
Renewable Energy ◽  
Power Quality ◽  
Distribution Network ◽  
Operating Conditions ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Network Systems ◽  
Analytical Assessment ◽  
Even Harmonics

This paper deals with the assessment of DC components generated by renewable energy resources with inverter-based interconnection system to the electric grid. DC injection is a critical issue related to power quality of distribution network systems with high penetration of inverter-based interconnection systems. This type of interface systems may improve the performance of the electric generation unit and affect positively or negatively the power quality of the distribution network depending on the proper or improper designation. The investigation of the various causes of DC components and the analytical assessment of their maximum levels are crucial for the proper operation of inverter-based interface systems and the limitation of DC injection. A method based on analytical calculations using a computer software has been implemented for the assessment of DC components contained on an inverter's output voltage when even harmonics are present on the network voltage. Moreover, a simulation package was used to demonstrate the existence of DC components under various conditions. It was proved by the current analysis that the amounts of DC components generated when even harmonics are present on the network voltage can be high under abnormalities on the power grid but they are not considerable under normal operating conditions.

Value of Distribution Network Reconfiguration in Presence of Renewable Energy Resources

2016 ◽  
Vol 31 (3) ◽  
pp. 1879-1888 ◽  
Author(s):  
Mohammad Reza Dorostkar-Ghamsari ◽  
Mahmud Fotuhi-Firuzabad ◽  
Matti Lehtonen ◽  
Amir Safdarian
Keyword(s):  
Renewable Energy ◽  
Distribution Network ◽  
Energy Resources ◽  
Network Reconfiguration ◽  
Renewable Energy Resources ◽  
Distribution Network Reconfiguration

Counter-Rotating Type Pump-Turbine Unit Stabilizing Momentarily Fluctuating Power From Renewable Energy Resources

2013 ◽  
Author(s):  
Toshiaki Kanemoto ◽  
Risa Kasahara ◽  
Hirotaka Honda ◽  
Toru Miyaji ◽  
Jin-Hyuk Kim
Keyword(s):  
Renewable Energy ◽  
Power Quality ◽  
Turbine Unit ◽  
Energy Resources ◽  
Stabilization System ◽  
Grid System ◽  
Renewable Energy Resources ◽  
Pump Turbine ◽  
Power Stabilization ◽  
Pumped Storage

It is difficult, for renewable energy resources, to provide constant power with excellent quality for the grid system. This serial research proposes a power stabilization system with a pumped storage to guarantee the power quality and capacity, while the energy resources are at unstable and/or fluctuating conditions. The power stabilization system with the counter-rotating type pump-turbine unit was prepared and operated at the pumping and the turbine modes. The experiments have verified that this type pump-turbine unit is reasonably effective to stabilize momentarily/instantaneously the fluctuating power from the renewable energy resources.

scholarly journals A Probe into Reactive Power Management in Renewable Energy System using Facts Devices

2019 ◽  
Vol 8 (12) ◽  
pp. 619-626 ◽  
Keyword(s):  
Renewable Energy ◽  
Power Management ◽  
Power Quality ◽  
Reactive Power ◽  
Energy Resources ◽  
Energy Utilization ◽  
Generation Model ◽  
Power Electronic ◽  
Renewable Energy Resources ◽  
Compensating Devices

In the modern era, most of the utility grid is connected with Renewable Energy resources (RERs). In addition to this, many power electronic converters and reactive power compensating devices are also incorporated into the existing grid. This makes the system complicated. Penetration of renewable energy resources affect many power system parameters like grid stability, quality of power, reactive power balance and Sufficient energy utilization. However, the Distributed Generation (DG) towards the power electronic interface creates some critical power quality events such as reactive power management, harmonics and voltage profile which makes the distributed system become a polluted one. This paper depicts the review of modelling and incorporation of various reactive power compensating devices like TCSC, SVC and STATCOM into RES. Power generation model of solar, wind and fuel farm is discussed in this paper. Reactive power compensating devices and its location and sizing are important for the stable and secure operation of the electric grid. Consequently, power quality issues, real-time interconnection issues and policies related to reactive power management are in this paper.

Comparison of Archimedean Screw and Normal Pump in Pumped Storage Generation Combined with Wind Power Generation

2013 ◽  
Vol 291-294 ◽  
pp. 439-444
Author(s):  
Ya Zhou Zhai ◽  
Jing Hao Ma ◽  
Masaki Mitobe ◽  
Soichiro Uehara ◽  
Shao Yan Gon ◽  
...  
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Fossil Fuel ◽  
Storage System ◽  
Wind Power Generation ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Advantages And Disadvantages ◽  
Pumped Storage

Renewable energy resources such as wind energy have a disadvantage that the quality of output power is lower than that of fossil fuel resources. To solve this problem, pumped storage power system with Archimedean screw is designed. The structure and principle of operation are introduced and the advantages and disadvantages are discussed according to the theory and the simulation. In this paper, comparison has been done by collecting and analyzing the data and simulated the system on different condition to show the differences of the two types of pumps working on the pumped storage system.

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