due to the use of a large number of power electronic equipment in the power system and the increase of nonlinear load, harmonic power quality problems become more and more complex. As one of the most important content...
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due to the use of a large number of power electronic equipment in the power system and the increase of nonlinear load, harmonic power quality problems become more and more complex. As one of the most important contents in the research of power quality, the harmonic of power system attracts more and more attention. This paper expounds the main reasons and the harms of harmonic, and analyses some methods of harmonic detection and suppression. Hybrid active power filter is an important way to control harmonic and improve power quality, According to the current research of harmonic suppression at home and abroad, the main development trend of harmonic suppression is analysis.
With the emergence of the energy crisis, more and more attention has been focused on energy saving. The energy saving technology of motor has also been widely concerned, because it is the main energy consumer. As the ...
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With the emergence of the energy crisis, more and more attention has been focused on energy saving. The energy saving technology of motor has also been widely concerned, because it is the main energy consumer. As the most potential energy saving technology, the variable frequency speed regulation has a good prospect of energy saving. It is of great significance to study the variable frequency speed control technology. This paper analyses the loss of asynchronous motor, and mainly discussed the key technology and existing problems of the variable frequency speed regulation.
The quality of electrical power in a network is a major concern which has to be examined with caution in order to achieve a reliable electrical power system network. Reactive power compensation is a means for achievin...
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The quality of electrical power in a network is a major concern which has to be examined with caution in order to achieve a reliable electrical power system network. Reactive power compensation is a means for achieving the goal of a reliable electrical power system. This paper made a comparative review of reactive power compensation technologies;the devices reviewed include Synchronous Condenser, Static Var Compensator(SVC) and Static Synchronous Compensator (STATCOM).
In order to study the voltage stability of power system, the basic bifurcation theory is used to analyze the common bifurcation phenomenon and the effects of bifurcation on the voltage stability. In this paper, the ap...
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In order to study the voltage stability of power system, the basic bifurcation theory is used to analyze the common bifurcation phenomenon and the effects of bifurcation on the voltage stability. In this paper, the application of static and dynamic bifurcation in voltage stability studies is reviewed respectively. In the static bifurcation analysis, the saddle node bifurcation (SNB) and the limit induced bifurcation (LIB) are analyzed emphatically. In the dynamic bifurcation analysis, Hopf bifurcation (HB) and singular induced bifurcation (SIB) are analyzed emphatically. These four kings of bifurcation causing mainly voltage instability are discussed and summarized detailedly; the advantages and disadvantages of these methods are compared. Finally, the further research field of bifurcation theory applied in voltage stability analysis is prospected.
To accommodate more Distribution Generations and improve power supply reliability, the concept of Smart Distribution Grid has been raised. It is the research focus of the smart grid and ensuring reliable power and qua...
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To accommodate more Distribution Generations and improve power supply reliability, the concept of Smart Distribution Grid has been raised. It is the research focus of the smart grid and ensuring reliable power and quality power supply. This paper covers the concept, significance, key technologies, development situation at home and abroad. As the new forms of the SDG, Self-Healing control (SHC), micro grid (MG), and Advanced Distribution Automation (ADA) is analyzed and compared with each other. Finally, it introduces the trend and new technology in the development of smart distribution grid.
The electric vehicle has brought fluctuation to the power system. The wide use of electric vehicles(EVs) has exacerbated this challenge. Firstly, the mathematical model of electric vehicles under random charging mod...
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The electric vehicle has brought fluctuation to the power system. The wide use of electric vehicles(EVs) has exacerbated this challenge. Firstly, the mathematical model of electric vehicles under random charging mode is given. Secondly,the power electronics charger topology is introduced. This paper analyzed the changes of the power system reliability when the proportion of electric vehicles increased, which shows the increase of electric vehicles under random charging mode poses a great threat to the reliability.
Due to the robots are limited in size and cannot be attached to more functions, which caused the practicality of the robot being reduced. In order to achieve the information collection and multipoint drug delivery in ...
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Energy Internet, integrates power, Internet, information and so on, can be organized according to the Internet architecture design concept of energy. Energy router is the core equipment of the energy internet with the...
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Energy Internet, integrates power, Internet, information and so on, can be organized according to the Internet architecture design concept of energy. Energy router is the core equipment of the energy internet with the function that control of energy and information, satisfies different requirements and management through network. The key to energy router is solid transformer and the control of different forms of energy. Ultimately, the achievement of energy router needs combination of information technology and energy technology.
With the rapid development of smart grid and information technology, Energy Internet has been attracting increasing attention from government as well industry. The current power grid and energy management system canno...
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With the rapid development of smart grid and information technology, Energy Internet has been attracting increasing attention from government as well industry. The current power grid and energy management system cannot meet optimal allocation and auxiliary function of clean energy power generation. The Energy router is an effective power device which cannot only realise the power control of each power supply, but also can optimise the allocation of electrical energy by communication equipment. Within an Energy Internet, energy router is the key element to receive, control, transmit, transfer, store and distribute energies, just like what a conventional router does in telecommunications. The energy router is designed as a control center on the distribution side. Based on conventional concept of energy hub, new features and improvements, including combining information processing unit, adding renewable energy as input power, proposing cost deduction solutions, and redesigning the storage system, have been added in designing energy router, which is to realize the final target of Energy Internet. In the end, with the consideration of market conditions, energy routers can be constructed based on existed industrial foundation, including in the markets that are controlled by monopoly electricity enterprises. Feasibility analysis and related advantages of developing energy routers are provided in the paper.
In modern society, in order to solve the traditional energy sources the more serious environmental pollution and energy shortage problems, all countries are vigorously promoting the development of new energy sources a...
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In modern society, in order to solve the traditional energy sources the more serious environmental pollution and energy shortage problems, all countries are vigorously promoting the development of new energy sources and the low-carbon electricity. As a clean, renewable and small footprint's new green energy, development and utilization technology of wind power energy is mature, so it has been developed and utilized in the world. This overview describes the advantages of using wind power, status of development of China and foreign wind power, the development of wind power technology and the future trend of wind power. Provide a reference for people to better understand the current situation and development trend of the world's wind power generation, the development of wind power generation is fast. Relatively speaking, it is a mature technology in new energy power generation, but there are many technical problems unresolved. In the future, we should set out to solve technical problems, and improve the efficiency of wind power.
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