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This paper studies the magnetic stress and vibration characteristic of the permanent magnet assisted synchronous reluctance machine (PM-SynRM). Firstly, the frequency and spatial orders of radial stress are investigated by analytical equations. Then, two PM-SynRMs are designed, and their open-circuit and armature magnetic stresses are calculated by finite element method (FEM) and compared with the...
Locational marginal price (LMP) is a market-pricing method used to determine optimal dispatch of interconnected power systems. In order to take system's operating risk into consideration, a modified risk-based LMP (RLMP) calculation method is given in this paper. We design a risk-based decentralized synergetic dispatch pattern in electricity market environment to avoid the drawbacks of centralized...
Based on eligibility a fuzzy CMAC controller (FCE) is proposed. The structure of FCE system is presented, and its learning algorithm is deduced. To make the algorithm fit to on-line control, an efficient implementation of FCE method is also given. Applying the FCE controller in a ship steering control system, the simulation results show that the ship course can be properly controlled in case of the...
This paper establishes a complete marine fuel system model, and gives a sparse matrix solver algorithm to calculate the pipe network flow and pressure of each branch node based on mathematical modeling thought mechanism analysis. In order to get accurate simulated results, fuel's viscosity-temperature curve can fit Chebyshev curve adaptively even when change the oil. With the using of object-oriented...
Torsional vibration in flexible servo system with finite stiffness shaft has received increasing attention. This paper presents a method aimed to suppress the vibration in speed response in both motor and load side. Based on resonance ratio control (RRC), we proposed a 4-order luenberger observer to estimate to tortional torque and the motor speed, which performed better than traditional disturbance...
The purpose of this paper is to develop a novel marine engine simulator to make up the deficiency of the existing one in the aspects of crew's operation exam and auto evaluation at home and abroad. Unlike traditional products, this new type of marine engine simulator doesn't need any additional devices but a computer with virtual reality technology. The simulator mainly includes four parts, 3D marine...
Switched Reluctance Machines (SRMs) show great advantages of structural simplicity, high reliability, wide speed range with high efficiency, which make them be ideal alternatives to applications of flywheel energy storage system. High efficiency operation over a wide speed range is important for flywheel energy storage system. This paper proposes a novel generating control strategy of SRM to optimize...
Air-core pulsed alternators greatly enhance the power density capabilities of pulsed power supply for electromagnetic launchers. Compared with iron-core electric machines, they require very high excitation currents. Usually, the self-excitation mode is adopted in these systems. However, the self-excitation mode is a positive feedback process which should be precisely controlled to avoid the system...
In this paper, an online evaluation method for AGC regulation based on WAMS is proposed. Firstly, we put forwards the evaluation index system which integrates the indices in time scale and state dimension, thus make a comprehensive appraisal for AGC units. Then responding to the high sampling rate and high precision character of WAMS data, the control process of AGC regulation is divided into three...
Primary frequency regulation plays a significant role in power system frequency control. As a result of the separation of plant and grid, it becomes necessary for the grid to monitor the primary frequency performance of generators. This paper designs an online evaluation system of primary frequency regulation based on WAMS. Firstly, the evaluation indices system is proposed, which assesses the primary...
Compared with the conventional short-pitched winding switched reluctance machine, the fully-pitched winding machine produces the effective electromagnetic torque by utilizing the changing mutual inductances among the phase windings. Previous works show that the fully-pitched winding machine can offer better circuit utilization, higher ratio of torque and current and higher efficiency. This paper compares...
This paper proposes the concept of real estate market harmony-degree, establishes evaluation system for the real estate market and provides method on how to evaluate real estate market.
Switched Reluctance Motors (SRMs) show great advantages of structural simplicity and high reliability in aerial starter/generator applications. This paper introduces the implementation of a high speed switched reluctance starter/generator system. First, the paper proposes a modeling method for switched reluctance starter/generator system, including switched reluctance machine and power circuit. The...
Conventional short-pitched winding switched reluctance machine realizes the electromechanical energy conversion by utilizing only the rising region of phase inductance at motoring mode, or the descending region of phase inductance at generating mode. Compared with the conventional switched reluctance machine, the fully-pitched winding machine realizes the electromechanical energy conversion by utilizing...
Due to the characteristics of high reliability, wide speed scope with high efficiency, and low cost, Switched Reluctance Generator (SRG) system is suitable for applications in the field of variable-speed constant-voltage generation, such as wind power generation, flywheel energy storage, electric vehicle, aircraft power generator, etc. In this paper, a nonlinear dynamic model of SRG system is established,...
Service industry and the real estate industry are hot topics which have been constantly researched in academia, this article conducted in-depth study by combining both above through real estate after-sale service. This study started from the current situations and problems of the development enterprise, property service enterprise and supervision department, deeply analyzed the problems in the real...
Departure headway distribution is significant for intelligent traffic control and traffic simulations. Jilin, an ordinary large city, is selected in this paper to study the departure headway distributions. Experimental results show that the log-laplace distribution model fits headway data better for free flow traffic condition, while the log-logistic distribution model is more suitable on the peak...
Miniaturization of communication devices has initiated towards the integration of passive and active radio frequency devices on the single chip in order to reduce the size and cost of the systems. Recent advancement in three-dimensional fabrication technologies in conventional CMOS process is leading to a system-on-chip integration in which RF devices are among the candidates to be integrated. Microwave...
At present, most of marine engine room simulators (MERS) in the world are based on networking technology. But such MERS needs much money and large space to install and use. So it can not meet the demand of the training individually in spare time for the crew. So a simulation system of a PC-Based marine diesel engine has been proposed. In this paper, a quasi steady state model of a large low-speed...
Compared with the conventional short-pitched winding switched reluctance machine, the fully-pitched winding machine can far better utilize the electric circuit. Due to the differences in principles of between motoring operation and generating operation regarding to the fully-pitched winding switched reluctance machine, this paper will propose a novel control strategy of generating operation of a three-phase...
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