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Wind turbine power output is totally intermittent in the nature. For grid connected wind turbine generators, power system operators (transmission system operators) need reliable and robust wind power forecasting system. Rapid changes in the wind generation relative to the load require proper energy management system to maintain the power system stability and of course to balance the power generation,...
Through the analysis of the electromagnetic properties for the rotor coil of turbine generator, we obtained the main magnetic field variation characteristics for the rotor winding and put forward the short circuit fault between rotor inter-turns causing the potential difference and circulation between the parallel branches of generation stator winding spectral method was applied on the spectrum analysis...
In this paper a new method has been proposed to decide optimal placement and best sizing of static synchronous compensator (STATCOM). Seeking the best place is performed using the sensitivity analysis and sizing of STATCOM is managed using the genetic algorithm. The average model can account for the high-frequency effects and power electronic losses, and more accurately predict the active and reactive...
Vibration faults frequently occurring to the feed water pump in large-scale power plants are diagnosed by the integrated neural network based on MATLAB. The integrated neural network for fault diagnosis is established from individual neural network and on the basis of information fusion. The strategies and principles for the realization and formation of integrated neural network are analyzed and a...
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...
A new methodology base on Least Squares Support Vector Machine (LS-SVM) for the electric power system monthly load forecasting is presented. The presented algorithm embodies the the structural risk minimization(SRM) principle is more generalized performance and accurate as compared to artificial neural network. In the time series the trend component and periodical component are considered to make...
Based on ANSYS software, several typical engineering examples were analyzed; and the secondary stress level, distribution characteristic, and variable of secondary stress trend with different geometric parameters were studied. The result shows that: for the UHV transmission towers, the secondary stress of primary members near the gradient changed place and the tower leg was remarkable; The secondary...
This paper presents a steady-state simulation study of oxy-fuel gas cycle power plant with CO2 amine absorption process using process software Aspen HYSYS™. The oxy-fuel gas cycle power plant studied was decomposed to four units: the air separation unit (ASU), the gas turbine cycle, the heat recovery steam generator (HRSG) and the CO2 capture process. Based on the steady-state simulations, the energy...
Propose the technical program of line loss calculation based on GIS. Using network topology analysis and integrated management of space attribute data, access to calculate the required load data. This method can automatically adapt to the changes of distribution network's structure.
Solid power system planning is fundamental to the safety, reliability and economy of power system operation. In the deregulated power grid environments, power grid planners not only have to handle massive geographic data, power equipment parameter data and grid operational data, but also have to solve very complex decision-making problems when they are committing power grid planning. Thus, it is necessary...
This paper presents a procedure for allocating reactive power using artificial neural network (ANN). Artificial neural network is trained based on data from Y-bus matrix. Training and testing of this ANN network have been done with five bus test system. Back propagation learning has been utilized to train the ANN. A numerical example on allocating reactive power using a feed forward back propagation...
This paper presents a voltage swell compensator based on a switched autotransformer by random hysteresis voltage control. The advantage of this compensator is that it uses only one controlled switch per phase with no energy storages. Also the control scheme purposed here distributes the harmonic spectrum of the load voltage and reduces its total harmonic distortion (THD). Different voltage swell events...
According to the hardware configuration used for HVDC control system from ABB, converter firing control (CFC) section is modeled based on PSCAD/EMTDC. All the functional modules of practical system which is controlled by ABB control system are reserved to make the dynamic response characteristics closer to the practical project. Single-phase to ground fault of AC transmission line is applied. The...
This paper presents modeling of the 500 kV transmission line located between Bang-Saphan 2 (BSP2) and Chom-Bung (CBG) substations, Thailand. The network is modeled based on the transient simulation program- PSCAD/EMTDC. The equivalent circuit of BSP2 and CBG is obtained from the actual parameters. The initial condition parameters are verified by PSS/E, an electrical simulation program. After the modeling...
This paper the dynamic model of multi-input and single-output is established, which takes the coal feed and water feed as the inputs and the main steam temperature as the output. Adaptive Network-based Fuzzy Inference System (ANFIS) is used to establish the system model, and using the field data on the identification and checking of model. The results show that the output of identification is consistent...
This paper introduces safe operation prospects of transmission line. An idea of transmission line online monitoring system is proposed. It states sensor technology and remote visual technology. It describes the development and the application of the transmission line online monitoring system in detail. Further we used the expert system for diagnosis power transmission line examples, to prove the feasibility...
A new fault isolation and restoration technique for distribution automation, which employs local Ethernet network, is presented. It can isolate all short circuit faults in the loop within 300ms and restore the supply of healthy sections in less than 1.2 seconds. A reliable fault location method for isolating the single phase to ground fault in the non-effectively earthed network, which makes use of...
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...
Collection of empirical data and to make it useful in the prediction of probability of future events has become essential aspect in the field of living probabilistic safety assessment. The purpose of this study is to make a new computer based method to update reliability data. The basis of the method is Bayesian updating approach. The article focus on time based failure rate that depends on Poisson...
The performance of a photovoltaic (PV) array is affected by array configuration, insolation, and temperature. It is important to understand the relation between these effects and the output power of PV array. This paper presents a Matlab Simulink based PV module model that includes a controlled current source and an S-Function Builder. The modeling scheme in S-Function Builder is deduced by some predigested...
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