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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Nowadays, a large scale of renewable energy has been connecting to power system and the real time simulation platform is widely used to carry out research on integration control algorithm, power system stability etc. Compared to traditional pure digital simulation and hardware in the loop simulation, power in the loop simulation has higher accuracy and degree of reliability. In this paper, a power...
In this paper, the permanent magnet motor without shoes of stator teeth was designed. In case of a shoeless motor, it is very easy to manufacture a stator with coil windings. It has, however, high cogging torque and torque ripples generally. The proposed model in this paper was designed considering cogging torque characteristic. The finite element analysis was performed to evaluate the effect of reducing...
Inverter disturbance has been widely discussed to improve the performance of AC motor control, with the very high nonlinearity and uncertainty of power electronic devices, it is still very difficult to be estimated and compensated accurately; therefore, the performances of most AC motor observers are affected by the inaccurate terminal voltage estimation. In this paper, the principle of PWM (pulse...
When bypass circuit of the PV module is opened and some solar cells are covered by a partial shadow, it is possible that the cells become hot spot by a reverse voltage. Moreover, the current detection methods have some problems that we have to measure the modules one by one, or the open position can't be identified in the string. The purpose of this research is to develop the detection technology...
Degradation of arresters is most commonly maintained by measuring electric current leakage. However, it is almost impossible to detect resistance-component current leakage that contributes to degradation of zinc oxide devices through normal measurement procedures, due to the fact that they contain static capacitance components. Therefore, we conducted synchronized measurement of electric current leakage...
\n order to find a new online method to identify the rotor inter-turn short circuit fault of brushless excitation synchronous generator, this paper analyzed the changes of electromagnetic properties and electrical parameters and got the fault characteristics that field current increased and reactive power decreased after fault. The relative deviation of generator output reactive power before and after...
This paper presents a novel full digital drive for voice coil motor (VCM) designed for the wafer stage (WS). Firstly, to suppress current ripple, the 5-level cascaded H-bridge switching power amplifier is put forward. Secondly, to resist external disturbances, a novel current control method based on proportional-integral (PI) control and Luenberger observer is proposed. Finally, the control method...
It is difficult to apply the thrust ripple reduction method to a 4-pole 3-slot permanent magnet linear synchronous motor (PMLSM). This paper describes about a new method of the thrust ripple reduction by using the magnet and the ferromagnetic block affixed to its airgap surface divided into five parts. The validity of the five division method is proved by comparing with the results when the movable...
This paper studies a three-phase contactless power transformer with a magnet yoke at a horizontal misalignment. The self-inductances and mutual inductances are simulated with three-dimensional finite element method and the characteristics of inductances are formulated as simple equations. Numerical simulation results confirm that the misalignment causes unbalance currents and reduction in transfer...
This paper presents the electromagnetic design of a direct drive 10 MW dual-stator superconducting permanent magnet wind power generator. The design was based on a conventional direct drive 6.4 MW PM generator with copper armature windings. The physical phenomena and operating parameters of the proposed generator when increasing the current in the MgB2 armature windings were analyzed using FEM software...
Blocking diodes are used in the PV power generation systems to prevent the reverse flow. In this study the string current and power losses on blocking diodes are actually measured in a 10kW-PV system. As a result, unevenness between string currents occurs especially in the periods of the sunrise and sunset. And the reverse voltage are imposed on the blocking diodes when the unevenness of currents...
This paper proposes a control method based on the H-infinity control theory to improve the Load Frequency Control (LFC) characteristics in a power system with distributed generation (DG). DG is assumed to include photovoltaic generation. The effectiveness of LFC using the H-infinity control theory is examined by using a power transmission simulator.
In this study, the temperature characteristics of a one-stage and a two-stage structure of Peltier devices were measured. We identified that the two-stage structure was able to suppress the temperature rise at the endothermic end. A temperature difference was established based on the charge transfer in semiconductors, with respect to both Joule heating and thermal conductivity.
We push forward setting of the elevator for barrier-free and exchanging of the LED light for energy saving in stations. But harmonic currents may increase by these facilities in the power distribution network. It is effective to take measures for harmonic currents from the design phase. In this paper, the method of this report can estimate harmonic current emissions in case of stations improved by...
\n this paper, a novel control strategy applied in permanent magnet linear synchronous motor (PMLSM) drive system is proposed based on Euler-Lagrange (EL) equation and passivity-based control (PBC) theory. The state equation of PMLSM in d-q reference frame is established. Some matrices with special structures are deduced to transform the state equation into EL form. From the energy point of view,...
In this paper, a pure torque loop control method without flux linkage observer and a modified double closed loop control method with a couple of derived simple equations for the control of the stator flux linkage amplitude were proposed for direct torque control (DTC) of brushless DC motor (BLDCM), using a 2-phase conduction mode. The objectives of the novel control strategies are trying to simplify...
HILS (Hardware in the loop simulation) is the middle stage of analytical method and evaluation of produce. If this technique can be used well, not only can it noticeably reduce development period and expense, but it has the advantage of being easy to change the parameter of motor and analyze the result because of its high reproducibility.[1] Therefore, the interest toward the development of HILS system...
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