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The construction of the charging station and battery exchange station can ensure the development of the electric vehicles industry. In the paper, the difference of the charging station and battery-exchange station is investigated, including the economic cost and benefit of the different mode. In addition, the factors affecting the development of the charging station and battery-exchange station is...
Based on new time frequency algorithm, a new interharmonic analysising method is raised in this paper. The number and approximate frequency of interharmonics is firstly gotten using Least-square algorithm. Then new time frequency algorithm is applied to measure the accurate frequency and magnitude of each interharmonic. The simulation indicates that this method mentioned above is able to measure frequency...
The decomposition of sulfur hexafluoride (SF6) in overheated electric equipment at different temperature in low humidity was simulated in the study. SF6 is very stable and not significantly decomposed at 200°C, 250°C and 300°C. SF6 is significantly decomposed at 350°C. SF6 is more easily to be decomposed and decomposed more rapidly at higher temperature.
Voltage stability has become rather important in modern power systems, the bifurcation of the adjoint system has been proposed for computing the saddle-node bifurcation point of the voltage stability. We derive the bifurcation analysis of the adjoint system, an example is given.
Four kind of modes of solar concentrator replacing the source of auxiliary steam system were proposed by integrating the characteristics of coal-fired units' auxiliary steam system. Theoretical analysis for the mode of solar concentrator replacing the forth steam extraction was conducted, showing the feasibility of the mode.
The paper is drawn from a 2-year study of black liquor concentration conditions by ultrafiltration ceramic membrane technology, and obtaining excellent fuel for coal burning boiler of electric power plant. The experiment implies that solids in black liquor can be concentrated up to 4-6 times then before under conditions of adding flocculants concentration is 4.0-4.5mg/L and filtration pressure is...
Micro-grid technology can integrate the advantages of distributed generation power system, to provide users with quality and reliable electricity. This paper designs the photovoltaic system which is short for PV based on the energy storage structure which not only analyses the energy flow direction of the charging and discharging circuit, but also designs the control strategy of charging and discharging...
Algorithms of the state estimation are regarded as the core part of the state estimation. Firstly, the basic concepts and mathematical models of the power system state estimation are described briefly. Then the current proposed algorithms for power system state estimation, including: least square algorithm, fast decoupled method, orthogonal transformation algorithm, state estimation algorithm based...
Optimization of the combination of power generation units is a very important problem as to improve the economic efficiency of power plant. Mind Evolutionary Computation (MEC) simulates the evolutionary process of human's mind. With convergence and variation process, MEC can get the optimum solution Compared with other optimizing method such as dynamic planning method, its arithmetic is simple- and...
There are two configuration modes of the FGD booster fan in thermal power plants. One is to install booster fan behind induced draft fan, called the separation mode; the other is to integrate the two kinds of fans, that is to cut off booster fan, but install a bigger induced draft fan which can support the pressure head for the whole system, called the integration mode. Through detailed analysis,...
In order to solve mode mixing, an improved HHT (IHHT) is proposed to identify modes of low frequency oscillation (LFO) in power systems. Firstly, by means of Fourier transform the approximate frequency range of every mode is determined; then methods such as masking signals or filters are chosen to separate mixing modes. Finally mode parameters can be calculated by linear least quadratic fitting. Simulated...
Bayesian Networks is used to study and deal with the reasoning under uncertainty in the power system fault process. Data mining method can find useful information for decision-making from massive history data. Therefore, an Augmented Naive Bayesian power network fault diagnosis method based on data mining is proposed to diagnose faults in power network. The status information of protections and circuit...
Micropump is one of the key components of MEMS, which has been used widely in many fields. This article focused on the review of micropumps driving and controlling and the application for micro power systems including microturbomachinery, micro fuel cells and microthrusters.
As the output power of the photovoltaic (PV) cell changes with the insolation , PV cell temperature and cell voltage changing. It is necessary to control the operating point to draw the maximum power of the PV cell in order to increase system efficiency. In this paper, two-level single phase PV grid-connected system is designed, which mainly includes PV cell, BOOST circuit, inverter, filter and the...
Apply sequential quadratic programming algorithm into large power system's reactive voltage optimization and introduce exact penalty function as algorithm improvement. Use improved global sequential quadratic programming algorithm to do the reactive power optimization algorithm to IEEE 30-bus system and IEEE 118-bus system. The result shows that the global sequential quadratic programming algorithm,...
Measurements of sunshine duration and average temperature data obtained from meteorological center in Cameroon spanning a period of 30 years (from 1961 to 1990) have been used to predict the availability of solar radiation at Yaounde (longitude11.31, latitude0.35N). Then we use ZABARA method to predict solar radiation from measured (available) sunshine duration. Finally HOMER software is employed...
A new on-line fault location method is proposed based on the voltage sag characteristics resulted by different faults in the power systems. Only the voltage sag measured at single end is used to locate the fault. For a given distribution system, construct a simulation model to obtain faulted section locating function and fault distance calculating function of the network. When a real short circuit...
In the sealed-auction-based electricity markets, to fast and accurately solve the random-fuzzy programming problem, which is for building optimal bidding strategies of generation companies and can simultaneously deal with both random variable and fuzzy variable, a improved genetic algorithm (IGA) is proposed based on a genetic algorithm with hybrid Laplace crossover and power mutation (HLCPM). The...
In the current power market environment of China, lease operation mode of pumped storage power station is an efficient way to realize static and dynamic benefits of power station, also it's one of main operation mode in China. A two-party profit model among pumped-storage power station and grid companies was build. The profits of power station and grid company were discussed to meet the individual...
This paper proposes a new partition principle based on bus sequence voltage distribution characteristic for wide area protection system. The influence of short lines, multiple fault and high resistance ground faults are analyzed. Information from multiple points within wide area network is supervised by central station of protection system. Then, suspected faulty zone can be detected according to...
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