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The direct-drive wind power generation system based on permanent magnet DC motor is researched, and the converter models of generator side and power network side is analyzed in detail. The system consists of a permanent magnet DC motor- generator set, a rectifier of high power factor, a boost converter and a full power inverter. The practical wind speed is simulated by the change of motor speed which...
A real wind power generation system is given in this paper. SVM control strategy and vector control is applied for generator side converter and doubly fed induction generator respectively. First the mathematical models of the wind turbine rotor, drive train, generator side converter are described. Then the control strategy of generator side converter system is given in detail. Finally the simulation...
As heat source for the solar powered ejector and compression refrigeration system, Collector-thermal Storage's design selection and performance directly affect operation of refrigeration system. By setting up a mathematical model of the solar energy Collector-thermal Storage and its components, the paper calculates optimum collector area under given condition of the cooling capacity inTaiyuan, and...
For the Italian Navy Multi Mission Frigates (Fremm) program, actually in progress (first ship will be delivered by Fincantieri in 2012), will be installed an advanced Ship Management System (SMS), evolution of the “Cavour” ship automation system, supplied by SEASTEMA (company owned by Fincantieri and ABB).
The central European 16.7-Hz railway grid is fed-beside by own power sources- by rotary and static converters. In context of recent low-frequency stability problems in the Scandinavia region, primary the interaction of four-quadrant line-side traction-converter control and surrounding rotary converters is a major concern. Therefore, adequate models for time-domain simulation are necessary. In this...
This paper proposes a combined Secondary and Tertiary Voltage Regulation (SVR+TVR) methodology based on real-time optimal power flows (OPFs) to periodically update the generators' voltage regulator set points. Minimum active power losses (MAPL) and maximum loadability (ML) OPF approaches are used for the proposed SVR+TVR control. The presented technique is compared against a “classical” SVR control,...
This paper presents a new approach for wide area dynamic monitoring of the system with many possible applications. One such application is discussed to provide real time stability controls. The new approach utilizes a substation based dynamic state estimation. The substation based dynamic state estimation uses data from relays, PMUs, meters, FDRs etc in the substation only thus avoiding all issues...
This paper presents a new computation method for transient stability analysis for electric power systems. Different from existing methods, a minimization problem is formulated for obtaining critical clearing time (CCT). The method is based on the computation of a trajectory on the stability boundary, which is referred to as critical trajectory in this paper. The critical trajectory is defined as the...
This paper deals with the use of system identification techniques for estimating low-order black-box state-space models formodal analysis. It presents a method to estimate state-space models for large power systems with many controllable devices from noisy measurements. To excite the system low-energy pulses generated by the controllable devices are used. The input signals are the controllable set-points...
The dynamic equivalent is an important tool in power systems to deal with size and complexity since it provides a reduced representation of the system without compromising the transient behavior of the part of the system that is of interest. For instance, computational time and effort can be saved by employing dynamic equivalents in power systems simulation studies. The determination of dynamic equivalents,...
This paper deals with an application of the power balance theory in a voltage and frequency controller (VFC) of an autonomous wind power generation using an isolated asynchronous generator (IAG) feeding three-phase four wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC)...
Stochastic assessment is a method to predict the severity and number of voltage sags at a bus of interest in the transmission network. In this paper, a technique using impedance matrix for stochastic assessment was developed to predict the voltage magnitudes due to faults at any bus in the electrical network. The proposed technique was applied to IEE 24- bus electrical network to illustrate its application...
This paper presents artificial neural network (ANN) based controller model to simulate the automatic voltage regulator (AVR) response for the transient stability analysis. Two different models are simulated considering single machine connected to an infinite bus (SMIB) to check the response of NN behaviour with conventional controller. Based on simulation results, it is found that NN controller gives...
In a deregulated electricity market one of the most important tasks of independent system operator (ISO) is to manage congestion as it threatens system security and may cause rise in electricity price resulting in market inefficiency. In corrective action of congestion management schemes, it is crucial for ISO to select the most sensitive generators to re-schedule their real and reactive powers optimally...
This work presents a novel algorithm for decomposing NFA automata into one-state-active modules for parallel execution on multiprocessor systems on chip (MP-SoC). Furthermore, performance related studies based on a 16-PE system for Snort, Bro and Linux-L7 regular expressions are presented.
In order to improve the production efficiency of H-Beam and reduce the labor strength of workers, and develop the biggest potential of equipment and possess position in intense market competition. Based on adjustment the roll gap value between the rollers of all rolling mills accurately and quickly by three stands reversible continuous rolling inline, the operating principle of system of roll gap...
Based on hybrid reference frame modeling and Kronpsilas tensor method, a simulation system of brushless doubly-fed generator (BDFG) is presented. Through network transformation, the model can deal with the time-varying topology and form the coupled system equations automatically. The simulation for inverter-BDFG generator system can get accurate results fleetly.
A vectorial implementation of dynamic optimal power flow (DOPF) including wind farms was presented. The vectorization of DOPF was established by arranging the control variables and state variables according to the variable types and time intervals. The asynchronous generators in wind farms were modeled in Q-V formulation. A step-controlled primal-dual interior point framework (SCIPM) with upper and...
Fuzzy PD controls strategy capturing maximum wind energy is presented according to the variable of wind. Fuzzy has been widely used because of its nonlinear and stability. However, when it comes to the stable region under capturing maximum wind energy, it becomes fluctuation and brings dangerous to grid. Improving stability and capturing maximum wind energy are the keys of research. Simulation results...
This paper presents a numerical method to analyze the complex process of fault synchronizing parallel operation. A set of state-space equations is adopted to calculate the transient current and electromagnetic torque of the process. A new type of high-voltage synchronous generator is introduced for fault synchronizing parallel operation.
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