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Optimal PAM Control for a Buck Boost DC-DC Converter with a Wide-Speed-Range of Operation for a PMSM
Abdul Motin Howlader,Naomitsu Urasaki,Tomonobu Senjyu,Atsushi Yona,Ahmed Yousuf Saber 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
A pulse width modulation-voltage source inverter (PWM-VSI) is used for variable speed permanent magnet synchronous motor (PMSM) drives. The PWM-VSI fed PMSM has two major disadvantages. Firstly, the PWM-VSI DC-link voltage limits the magnitude of the PMSM terminal voltage. As a result, the motor speed is restricted. Secondly, in a low speed range, the PWM-VSI modulation index declines. This is caused by a high DC-link voltage and a low terminal voltage ratio. As a result, the distortion of the voltage command and the stator current are increased. This paper proposes an optimal pulse amplitude modulation (PAM) control which can adjust the inverter DC-link voltage by using a buck-boost DC-DC converter. At a low speed range, the proposed system can reduce the distortion of the voltage command, which improves the stator current waveform. Also, the allowable speed range is extended. In order to verify the proposed method, experimental results are provided to confirm the simulation results.
Optimal PAM Control for a Buck Boost DC-DC Converter with a Wide-Speed-Range of Operation for a PMSM
Howlader, Abdul Motin,Urasaki, Naomitsu,Senjyu, Tomonobu,Yona, Atsushi,Saber, Ahmed Yousuf The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
A pulse width modulation-voltage source inverter (PWM-VSI) is used for variable speed permanent magnet synchronous motor (PMSM) drives. The PWM-VSI fed PMSM has two major disadvantages. Firstly, the PWM-VSI DC-link voltage limits the magnitude of the PMSM terminal voltage. As a result, the motor speed is restricted. Secondly, in a low speed range, the PWM-VSI modulation index declines. This is caused by a high DC-link voltage and a low terminal voltage ratio. As a result, the distortion of the voltage command and the stator current are increased. This paper proposes an optimal pulse amplitude modulation (PAM) control which can adjust the inverter DC-link voltage by using a buck-boost DC-DC converter. At a low speed range, the proposed system can reduce the distortion of the voltage command, which improves the stator current waveform. Also, the allowable speed range is extended. In order to verify the proposed method, experimental results are provided to confirm the simulation results.
Howlader, Abdul Motin,Urasaki, Naomitsu,Yona, Atsushi,Senjyu, Tomonobu,Saber, Ahmed Yousuf Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.2
Wind is an abundant source of natural energy which can be utilized to generate power. Wind velocity does not remain constant, and as a result the output power of wind turbine generators (WTGs) fluctuates. To reduce the fluctuation, different approaches are already being proposed, such as energy storage devices, electric double layer capacitors, flywheels, and so on. These methods are effective but require a significant extra cost to installation and maintenance. This paper proposes to reduce output power fluctuation by controlling kinetic energy of a WTG system. A MW-class pitch-regulated permanent magnet synchronous generator (PMSG) is introduced to apply a power fluctuation reducing method. The major advantage of this proposed method is that, an additional energy storage system is not required to control the power fluctuation. Additionally, the proposed method can mitigate shaft stress of a WTG system. Which is reflected in an enhanced reliability of the wind turbine. Moreover, the proposed method can be changed to the maximum power point tracking (MPPT) control method by adjusting an averaging time. The proposed power smoothing control is compared with the MPPT control method and verified by using the MATLAB SIMULINK environment.
Mun, Bongjin S.,Liu, Zhi,Motin, Md Abdul,Roy, Probir C.,Kim, Chang Min Elsevier 2018 International journal of hydrogen energy Vol.43 No.18
<P><B>Abstract</B></P> <P>The interaction of H<SUB>2</SUB> molecules with a ZnO (0001) single crystal surface has been studied over a wide pressure (10<SUP>−6</SUP>–0.25 Torr) and temperature (300–600 K) range using ambient pressure X-ray photoelectron spectroscopy (AP-XPS). ZnO is well-known for interstitial hydrogen and hydrogen atoms in ZnO are believed to be incorporated by the dissociative adsorption of H<SUB>2</SUB> molecules in the atmosphere and their subsequent diffusion into the bulk. The dissociative adsorption of H<SUB>2</SUB> has been investigated at elevated pressures because H<SUB>2</SUB> molecules are not dissociated on the ZnO single crystal surface under ultrahigh vacuum (UHV) conditions. When the pressure is increased to several mTorr, the dissociative adsorption of H<SUB>2</SUB> takes place to form OH bonds on the surface. At 0.25 Torr, the ZnO surface is saturated with H atoms and the coverage is estimated to be 1.1 × 10<SUP>15</SUP> atoms/cm<SUP>2</SUP> at 300 K. At higher surface temperatures, the equilibrium between the dissociative adsorption of gas-phase H<SUB>2</SUB> molecules and the associative desorption of surface H atoms is established. While maintaining the equilibrium, the surface has been monitored successfully <I>in situ</I> by utilizing AP-XPS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surface OH bond on ZnO under hydrogen environment has been characterized. </LI> <LI> The surface was monitored <I>in situ</I> over a wide pressure range using AP-XPS. </LI> <LI> Pressure plays an import role for the dissociation of H<SUB>2</SUB> on ZnO. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>