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In this paper, a novel comprehensive design, including inverter and motor topology, and PWM scheme, is proposed to reduce iron losses for high speed induction motors. In the proposed method, two inverters are connected with a twin-coil motor. Two counteracting PWM schemes are applied in the two inverters, feeding the same fundamental currents into the twin coils, meanwhile switching in opposite phase...
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...
We applied advanced heat dissipating technology to reduce heat resistances of the key devices to increase the output power density of the inverter. The IGBT modules were direct water-cooled, and the integrated DC-link capacitor was indirect water-cooled. We conducted the simulation and the test, which proved that reducing the heat resistances was effective to improve the output density of the inverter...
Reducing switch loss and increasing heat-sinking capability were very important research topic in the high power density inverter for EV/HEV applications. In this paper, an inverter with a new development power module was built. The power module was packed using a hybrid SIC power device to reduce the switching loss and direct cooling technology to decrease the thermal resistance. The double pulse...
The performance of a speed-sensorless induction motor drive is poor at low-speed range. This is because the inverter nonlinear error, such as inaccurate motor parameters, deadtime, turn on/off delay, and on-state voltage drop of power switches, has strong influence on the speed estimation at low-speed range. In this paper, the feedback gains of an adaptive full-order observer are designed to guarantee...
In order to increase the operating flexibility and reliability of HVDC lines for power transmission, this paper studies the technical feasibility of interconnecting two Chinese LCC HVDC using a high power DC/DC converter. A new control system is proposed for each rectifier, inverter and DC/DC converter to enable independent operation of each terminal. DC voltage droop feedback is designed to moderate...
Solar is the fastest growing source of renewable electricity in the U.S. The anticipated PV proliferation brings integration challenges on system volt/var performance at the utility scale. One of the greatest challenges is to maintain desirable feeder voltages in utility distribution networks. The intermittent PV generation causes more frequent operation of volt/var control (VVC) devices to alleviate...
Compared with the silicon power devices, silicon carbide(sic) power devices are expected to have a great impact on inverter efficiency, weight, volume and reliability. In order to research on the sic power devices, A hybrid module with si IGBT and sic schottky diodes was built. In this paper, characters of si diodes and sic diodes were shown. Than switch characters of the all si module and hybrid...
This paper presents the synchronous harmonic optimum pulsewidth modulation (SHOPWM) for three level diode clamped inverter. First, the problem of minimizing stator current harmonics when the asynchronous machine is fed by PWM inverter is introduced. A distortion factor in proportion to the total stator current harmonic distortion is selected for solving the problem. A subsection synchronization modulation...
Take a cascaded multilevel inverter with four H-bridges in each phase leg for example, this paper studies the basic theories of two different carrier phase-shifted SPWM (CPS-SPWM) methods: unipolar dual-frequency CPS-SPWM and bipolar CPS-SPWM, and compares the advantages and disadvantages of these two algorithms. It also does some researches on the factors which may influence the output waveform quality...
With the application of multilevel inverter in the high voltage and large power occasions in recent years, its modulation strategy has become a research hot point in the field of power electronics. As STATCOM is a typical application of multilevel converter, its common modulation strategies such as Step Wave modulation, Specific Harmonic Elimination modulation, Carrier PWM modulation, Space Vector...
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