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The following topics are dealt with: electric machines; inverters; power system fault isolation; energy public policy; power semiconductors; active power filters; LED lighting; electric drives; power converters; renewable energy generation; digital control; PHEV transportation; EMI analysis; machine control; microgrid; wind energy systems; and power quality.
It gives me great pleasure to be able to welcome you to Atlanta for the 2nd Annual IEEE Energy Conversion Conference and Exhibition. As we hope this is now widely known, this conference is the merging of the PELS Power Electronics Specialist Conference and the Industrial Power Conversion Systems Department sessions of the IAS Annual Meetings. The broad size, appeal and quality of ECCE are a testament...
Rotor slot harmonics are found in the stator current waveforms for most squirrel-cage induction motors. These harmonics are caused by the finite number of rotor slots in a motor, and their frequencies are inherently correlated with the motor's rotational speed. A frequency demodulation approach is proposed in this paper to continuously and accurately track the rotational speed for grid-connected induction...
The split ratio of several types of electrical machines has been identified as an important optimisation parameter. While the optimisation of split ratio in high-speed permanent magnet, switched reluctance and flux-switching machines has been researched, this parameter has often been neglected in the design of high-speed induction machines. In this paper, using a described multi-domain design environment...
This paper reports on the study of winding asymmetries in small synchronous generators. These types of generator are commonly used in diesel generator or back-up systems and are usually no more than a few or few tens of kilowatts with two, four or six salient poles. The 3-phase winding is 120 deg pitched but often lap windings are not used, rather a hybrid of concentric winding and double layering...
This paper presents a new algorithm for electromagnetic torque and flux estimation in a sensorless drive when uncompensated dc offset of current and/or voltage sensors are present. The novel feature of the offset error correction algorithm is an attempt not to eliminate the consequence of problem but to identify its source. The algorithm uses the first harmonic of estimated torque and dc value of...
The objective of this paper is to propose a modularized bi-directional grid-tied inverter (BGI) with asynchronous sigma-delta modulation (ASDM) control for the renewable energy (RE)-supplied DC power system. The proposed BGI can be operated either in the grid-tied mode (GTM) or the power factor correction mode (PFCM) which is necessary features for the RE-supplied DC power system. The proposed BGI...
This paper presents predictive digital controlled three phase bi-directional inverter with wide inductance variation. The bi-directional inverter can fulfill both grid connection and power factor correction. With a predictive digital control, the inverter is allowed to have a wide inductance variation, reducing core loss and size significantly. The proposed predictive digital control laws can be derived...
This paper presents design and implementation of a 5 kW 1 φ bi-directional inverter with wide inductance variation. The bi-directional inverter can fulfill grid connection and power factor correction, in which inductor current can vary from 0 to 32A in one line cycle. This will result in wide inductance variation, around 7 times for an inductor constructed with an MPP core, and thus high current ripple...
A dual mode time-sharing inverter has higher efficiency than other type grid-connected inverter due to only one power stage of it working in high frequency state at any time. In this paper, small signal modeling of this inverter is carried out, which reveals that the control-to-grid current transfer function of this inverter has a right half plane zero at low frequency during the “Boost” operating...
The contribution of distributed generation (DG) to network fault levels depends heavily on the technology employed. In the case of directly connected rotating machines the fault behavior is well established; with synchronous generators contributing higher fault levels than the corresponding induction generators. The contribution of inverter-based distributed generation (IBDG) is the lowest due the...
The higher reliability of meshed grids, whether in power or communication, when compared with radial grids is well established. However, while meshed grids provide higher reliability, protection of meshed grids is challenging. In smaller systems such as microgrids, line impedances can be small and many branches may experience approximately the same level of fault current. Locating faults quickly before...
We show that medium-voltage dc power buses can be protected against short circuit faults by coordinating the action of a converter that supplies power to the bus with the action of contactors that are used to reconfigure the bus connections. Following a fault, the bus is de-energized (so there is no large current to interrupt), one or more contactors are reconfigured, and the dc bus is then reenergized...
In the micro-grid, the grid-connected inverter and its filter are important to convert and transmit the energy. In this paper, a T filter is used to reduce the harmonics of the grid-current. However, it will be lack of enough stability. In order to overcome this obstacle, a new passivity based controller, namely IDA-PBC is proposed in this paper. And the paper analyses the stability of the controller...
The effect of mechanical stress on the power dice is investigated by considering the application of mechanical stress on a Punch Through Planar Insulated Gate Bipolar Transistor under static electrical characterizations. Specific test vehicles and test bench for applying a tensile or compressive mechanical stress are described in detail. Furthermore, 2D finite element simulations are carried out to...
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