Demand of power is growing day by day but non-conventional sources which are primary sources of energy are not only limited but also the pollutants released from them cause pollution. Microgrid system is one of the be...
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ISBN:
(纸本)9781467385886
Demand of power is growing day by day but non-conventional sources which are primary sources of energy are not only limited but also the pollutants released from them cause pollution. Microgrid system is one of the best solutions of feeding electrical demand and checking pollution as most of the distributed energy resources (DER) used in the microgrid are environment friendly. Microgrid also maintains reliability of electricity in the system. Use of renewable generators like photo voltaic (PV), wind etc. provide power using conventional sources with less pollution, but their implementation in grid causes several complications like circulating current, voltage harmonics, reduction in storage life, over voltage and over current in transient etc. Apart from that other challenges like active- reactive power sharing, current sharing, power management among renewable sources and high penetration of renewable energy are required to be focused to increase the handling and working capability of microgrid. The paper proposes an extensive literature survey on these severe problems in microgrid system and enlists the different work going on to eliminate the particular type of problems.
The accretion or demand of distributed generators (DG) have significant or meaningful operation along with the electric power system;the organize way to reassure the proper operation of the power system along with the...
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ISBN:
(纸本)9781467385886
The accretion or demand of distributed generators (DG) have significant or meaningful operation along with the electric power system;the organize way to reassure the proper operation of the power system along with the DG set, more and more variables and constrain have to be predefined and controlled. Formation of islanding phenomenon is one of the major issued problem confronted with this kind of power generation scheme, in which DG source may keep working in a stable or normal way even if main electric power system (EPS) has failed. There are various methodologies have been evolved and advanced to avert this situation. They are classified as detection through passive method, active and communication systems based method. Islanding occurrences is the most issued problem in a recent time power system working along with the DG. A variety of problems occur when a solar Photovoltaic is working as distributed generated (DG) source. Islanding refers to a condition when a DG source continues to supply power to a load even though there is no power from the main source during the disconnection from the main grid at the occurrence of fault or some other severe phenomenon, refers to a situation or condition called islanding. When workers who may not perceive that the load is still powered after the disconnection from the EPS or main source so this condition can be dangerous to the grid workers. When this condition occur the DG source should gets immediately disconnected from the local load in minimum time delay. Islanding causes unfavorable effects which are low power quality, personnel potential danger, grid-protection interference and equipment damage. Islanding can causes very dangerous or abnormal situation for both people and apparatus, So islanding should be quickly determine by inverters and protective relays. Islanding finding out through passive method examines system specification without inducing any interruption and disturbance into the grid (EPS). In this propose
The objective of this paper is to investigate over/under-voltage protection (OVP/UVP) of passive islanding detection method of distributed generations in electrical distribution systems. The IEEE 14-bus system is simu...
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ISBN:
(纸本)9781467323284
The objective of this paper is to investigate over/under-voltage protection (OVP/UVP) of passive islanding detection method of distributed generations in electrical distribution systems. The IEEE 14-bus system is simulated with Powerworld simulator. The studies show relationship between load and NDZ with DG in power system. The simulation results have showed that the change of load will affect the rate of transfer of AP uneven. If OVP/UVP of passive islanding detection method used algorithm with AP/P equation for decision, it may not be able to detect islanding condition In addition, if the multiple DGs in electrical distribution systems can replace active power of utility system, the OVP/UVP of passive islanding detection method cannot detected the state of islanding.
The distributed flexible network PV (photovoltaic) system is a kind of dc micro-grid which is composed of several PV generation systems, a battery bank and loads. Controller of each converter takes local information a...
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ISBN:
(纸本)9781467323284
The distributed flexible network PV (photovoltaic) system is a kind of dc micro-grid which is composed of several PV generation systems, a battery bank and loads. Controller of each converter takes local information and control the converter autonomously. However, there are several problems like voltage rise in dc link causing loss of maximum power control by sudden change of circumstances like as the change of irradiance and load. The authors propose introducing MAS (multi-agent system) to solve those problems. The control method is implemented and validated by experiment. Agents are implemented through DSP (digital signal processor) and CAN (controller area network) communication.
Different types of multiple input DC-DC converter has been proposed by number of researchers for the integration of more than one energy sources. The development of a suitable power electronic interface is very much e...
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ISBN:
(纸本)9781467385886
Different types of multiple input DC-DC converter has been proposed by number of researchers for the integration of more than one energy sources. The development of a suitable power electronic interface is very much essential for the integration of those sources with less component counts. The implementation of a novel dual input bridge type DC-DC converter for hybrid energy source integrationis discussed in this paper. The converter can accommodate two sources with single inductor and capacitor at the output side. The converter is well suitable for the effective integration of renewable sources like solar-PV, wind and other low voltage sources like fuel cells and battery banks etc The Computer simulations of the proposed converter topology using MATLAB/Simulink platform has been carried out and results are presented. An experimental prototype is also built in the laboratory environment in order to verify the theoretical results.
This paper presents the design and control of a distributed generation system using wind and solar PV (Photovoltaic) energy sources feeding to a 3-phase 4-wire network. The wind energy conversion system consists of a ...
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ISBN:
(纸本)9781467385886
This paper presents the design and control of a distributed generation system using wind and solar PV (Photovoltaic) energy sources feeding to a 3-phase 4-wire network. The wind energy conversion system consists of a wind turbine coupled to DFIG (Double Fed Induction Generator) equipped with MPPT (Maximum Power Point Tracking). The MPPT demands speed control which is realized using vector control of the rotor side converter. The voltage and frequency control is achieved through load side converter connected to the common DC bus. Solar PV power is fed to the same DC bus using DC-DC boost converter which is also equipped with MPPT algorithm to extract maximum energy from the incident solar energy. The system is modeled in Sim-Power System tool of MATLAB and its performance under all the practical conditions e.g. varying wind speed and radiation;unbalanced and nonlinear load is presented. Under all these conditions;the stator currents flowing through DFIG are balanced and sinusoidal. The harmonics in load voltage under all conditions are within requirement of IEEE 519 standard. The scheme doesn't envisage measurement of any mechanical quantities e.g. wind speed or rotor position. Finally the effectiveness of the system is demonstrated experimentally using a 3.7 kW DFIG and a 5 kW solar array simulator.
The IceCube Neutrino Observatory, a cubic-kilometer-scale neutrino detector at the geographic South Pole, has reached a number of milestones in the field of neutrino astrophysics: the discovery of a high-energy astrop...
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The IceCube Neutrino Observatory has discovered a diffuse astrophysical flux up to 10 PeV and is now planning a large extension with IceCube-Gen2, including an optical array and a large radio array at shallow depth [1...
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The IceCube realtime alert system has been operating since 2016. It provides prompt alerts on high-energy neutrino events to the astroparticle physics community. The localization regions for the incoming direction of ...
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For the in-ice component of the next generation neutrino observatory at the South Pole, IceCubeGen2, a new sensor module is being developed, which is an evolution of the D-Egg and mDOM sensors developed for the IceCub...
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