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This work investigates the impact of thin electrical steel laminations on the performance of interior permanent magnet (IPM) motors for electric vehicle traction. Three different electrical steel grades are used in an IPM motor design and the performance is evaluated by simulation. It is found that thin laminations can improve the efficiency of the IPM motor but the output torque could be slightly...
In brushless dc motor (BLDCM) precise commutation point and commutation interval, which impact motor torque ripple and motor efficiency are significant issue. Especially for high-speed high-power BLDCM drive without rotor position sensors (i.e. sensorless drive), the impact of commutation electrical angle error becomes more important. However commutation error is inevitable due to interference, detection...
To reduce fuel consumption and avoid over-size problems of diesel generators (DG), this paper propose a hybrid auxiliary power supply (APS) system for offshore wind farms (OWF) with battery energy storage systems and wind turbine converters. And furthermore, to improve the dynamic performance and transient stability, a new re-synchronize control strategy for wind turbine converter (WTC) in islanding...
Control of a three-phase inverter with neutral-line voltage injection is proposed to improve the output voltage waveform. This inverter consists of a main three-phase inverter and an auxiliary single-phase inverter; the main inverter acts in the 120-degree conduction mode and the auxiliary inverter behaves as a wave shaper with three times frequency of the main frequency. The main inverter converts...
In indirectly hydrogen cooled turbine generators used in high-efficiency combined cycle power plants, improving the energy efficiency and increasing the power density are required for one of the solutions of the global environmental problems. When the output current is increased for achieving the high power density, the stray load loss at the stator end region is increased by the leakage flux from...
Mathematical models considering cross-magnetization due to magnetic saturation in IPMSMs have been reported by many researchers. However, their models do not strictly consider space harmonics in armature current magnetomotive force (MMF), rotor magnet MMF and air gap permeance. Therefore, we propose a new strict mathematical model. The full paper will elaborate on the model and show validation results...
This paper reviews the development and testing aspects of high speed induction machines, through a case study involving a 120 [kW], 25000 [rpm] Induction Machine for a power generation application. In the first part, developments in materials and components including electrical steels and copper alloys are discussed, and their impact on the machines' design and construction is investigated. In the...
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...
Compared with three-phase SRM, multi-phase SRM is higher power density and lower torque ripple. However, with phase number increasing, the requirement of power converters for multi-phase SRM such as using less power devices and independence between phases are enhanced. In this paper, six kinds of power converters for six-phase SRM are investigated and compared including asymmetric half bridge (AHB)...
In this paper, a novel 12/8 segmental rotor type switched reluctance motor (SRM) is proposed for vehicle cooling fan application. Unlike conventional structures, the stator of the proposed structure is constructed with two special stator poles in which the exciting and auxiliary poles are designed exclusively. The rotor is constructed from a series of discrete segments, each of which is embedded in...
This paper proposes a direct power control (DPC) strategy for the grid-connected voltage source inverter (VSI) without phase-locked loop (PLL) under harmonically distorted voltage conditions. A virtual angular is employed instead of the voltage vector angular acquired by the PLL. The second-order vector integrator (SOVI) is integrated with the DPC to implement two different control targets of smooth...
In an electrolytic capacitor-less single-phase to three-phase inverter, a control bandwidth limitation adversely affects the source current response. Since the inverter does not energy buffer such as an electrolytic capacitor, the spatial harmonics of motor cause the source current harmonics. Moreover, d-axis current reference of the system is obtained by trial and error in off-line. This paper proposes...
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...
This paper investigates detailed aspects involved in the electrical machine topology selection for high speed automotive superchargers, through a case study involving a 48V 15kW peak application. The transient nature of the application is taken into account together with the different cooling options available to the electrical machine within the vehicle.
In this paper, a heat equivalent circuit model of 300 kW class transformer coil for contactless power transfer (CPT) system is proposed to estimate coils temperature rise. This model is featured by considering the differences of the heat generation of the AC resistance loss due to the high frequency flux. It is revealed by means of this model that 10 minute operation of a 300 kW CPT transformer is...
The single-phase PWM rectifier is the main component of the AC-DC-AC converters in high-speed railway electric traction system. This paper presents a fast and robust fault diagnosis and fault tolerant control method for the catenary current and DC-link voltage sensor faults in the single-phase PWM rectifier control system. The sliding mode observer (SMO) including inserted linear correction term is...
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...
Iron losses predominate in automotive traction applications at partial load and thus significantly in driving cycles. In this work, iron losses and overall drive losses of saturated salient pole synchronous machines are minimized by optimal control of flux linkage, in magnitude and waveform. Loss minimizing flux magnitude is calculated in real-time including copper-, inverter- and iron losses. By...
This paper describes a development of a high power density power converter using flying capacitor multilevel circuits for PV systems. To connect the PV systems to a power grid, a power conditioner system (PCS) is required. Sine wave filters and EMI filters are required to satisfy harmonics regulations such as CISPR. These filters are dominant in a total volume of the PCSs. To design a small PCS to...
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