This paper proposes a design and implementation of the bi-directional DC-DC converter for Wind Energy Conversion System. The proposed project consists of boost DC/DC converter, bi-directional DC/DC converter (BDC), pe...This paper proposes a design and implementation of the bi-directional DC-DC converter for Wind Energy Conversion System. The proposed project consists of boost DC/DC converter, bi-directional DC/DC converter (BDC), permanent magnet DC generator and batteries. A DC-DC boost converter is interface with proposed wind system to step up the initial generator voltage and maintain constant output voltage. The fluctuation nature of wind makes them unsuitable for standalone operation. To overcome the drawbacks an energy storage device is used in the proposed system to compensate the fluctuations and to maintain a smooth and continuous power flow in all operating modes to load. Bi-directional DC-DC converter (BDC) is capable of transforming energy between two DC buses. It can operate as a boost converter which supplies energy to the load when the wind generator output power is greater than the required load power. It also operates in buck mode which charges from DC bus when output power is less than the required load power. The proposed converter reduces the component losses and increases the performance of the overall system. The complete system is implemented in MATLAB/SIMULINK and verified with hardware.展开更多
A Magnetic DC plasma torch has been developed. Magnetic field distributions of solenoid coils have been calculated electrodynamically. For Ar +H2 plasma, the effects of an akial magnetic field and gas flow rate on the...A Magnetic DC plasma torch has been developed. Magnetic field distributions of solenoid coils have been calculated electrodynamically. For Ar +H2 plasma, the effects of an akial magnetic field and gas flow rate on the characttristics of the plasma jet were studied. Electron temperature, density and plasma velocity at 80 mm from the nozzle have been measured using a floating double probe and a Mach probe. The values of the heat fluxes to substrate were derived from experimental data.展开更多
This paper introduces a novel single-phase asymmetrical multilevel inverter suitable for hybrid renewable energy sources. The proposed inverter consists of two isolated DC sources and six power semiconductor controlle...This paper introduces a novel single-phase asymmetrical multilevel inverter suitable for hybrid renewable energy sources. The proposed inverter consists of two isolated DC sources and six power semiconductor controlled switches. The suggested inverter is capable of generating seven-level output when the input DC voltage is taken in the ratio of 1:2. The higher magnitude DC source is fed from Photo Voltaic (PV) panels, whereas the lower magnitude DC source is fed from Wind Turbine (WT) driven Permanent Magnet DC (PMDC) generator. Both the renewable energy sources are connected to the inverter via two DC-DC boost converters connected in cascade (i.e. one for maximum power point tracking and another for DC-link voltage control). The proposed hybrid renewable energy source inverter is connected to single-phase grid via proper control systems. The complete system is simulated using MATLAB/SIMULINK and the results are presented in detail.展开更多
Purpose The high energy photon source(HEPS)is a diffraction-limited storage ring light source being built in Beijing,China.The HEPS accelerators consist of the storage ring and its injector which includes the linac,bo...Purpose The high energy photon source(HEPS)is a diffraction-limited storage ring light source being built in Beijing,China.The HEPS accelerators consist of the storage ring and its injector which includes the linac,booster and beam transport lines.The magnet system is one of the most important systems for the accelerators.In this paper,the field design,mechanical design and some special issues of the main magnets for the injector are presented.Methods The magnets for the linac and transport lines work at DC mode,whereas the magnets for the booster work at dynamic mode.So the module of OPERA/TOSCA is used to design the DC magnetic field and the module of OPERA/ELLEKTRA is used to design the dynamic magnetic field.The CAD programs are used to design the mechanical structures of the magnets.Results The magnetic field simulation results of all the magnets for the injector can meet the physical requirements,the mechanical designs of all magnets are reasonable,and engineering drawings of the magnets for production are finished.Conclusions Both the magnetic field design and mechanical design of all magnets are satisfied with the physical requirements of the HEPS injector;the production of all magnets has been started up.展开更多
文摘This paper proposes a design and implementation of the bi-directional DC-DC converter for Wind Energy Conversion System. The proposed project consists of boost DC/DC converter, bi-directional DC/DC converter (BDC), permanent magnet DC generator and batteries. A DC-DC boost converter is interface with proposed wind system to step up the initial generator voltage and maintain constant output voltage. The fluctuation nature of wind makes them unsuitable for standalone operation. To overcome the drawbacks an energy storage device is used in the proposed system to compensate the fluctuations and to maintain a smooth and continuous power flow in all operating modes to load. Bi-directional DC-DC converter (BDC) is capable of transforming energy between two DC buses. It can operate as a boost converter which supplies energy to the load when the wind generator output power is greater than the required load power. It also operates in buck mode which charges from DC bus when output power is less than the required load power. The proposed converter reduces the component losses and increases the performance of the overall system. The complete system is implemented in MATLAB/SIMULINK and verified with hardware.
文摘A Magnetic DC plasma torch has been developed. Magnetic field distributions of solenoid coils have been calculated electrodynamically. For Ar +H2 plasma, the effects of an akial magnetic field and gas flow rate on the characttristics of the plasma jet were studied. Electron temperature, density and plasma velocity at 80 mm from the nozzle have been measured using a floating double probe and a Mach probe. The values of the heat fluxes to substrate were derived from experimental data.
文摘This paper introduces a novel single-phase asymmetrical multilevel inverter suitable for hybrid renewable energy sources. The proposed inverter consists of two isolated DC sources and six power semiconductor controlled switches. The suggested inverter is capable of generating seven-level output when the input DC voltage is taken in the ratio of 1:2. The higher magnitude DC source is fed from Photo Voltaic (PV) panels, whereas the lower magnitude DC source is fed from Wind Turbine (WT) driven Permanent Magnet DC (PMDC) generator. Both the renewable energy sources are connected to the inverter via two DC-DC boost converters connected in cascade (i.e. one for maximum power point tracking and another for DC-link voltage control). The proposed hybrid renewable energy source inverter is connected to single-phase grid via proper control systems. The complete system is simulated using MATLAB/SIMULINK and the results are presented in detail.
文摘Purpose The high energy photon source(HEPS)is a diffraction-limited storage ring light source being built in Beijing,China.The HEPS accelerators consist of the storage ring and its injector which includes the linac,booster and beam transport lines.The magnet system is one of the most important systems for the accelerators.In this paper,the field design,mechanical design and some special issues of the main magnets for the injector are presented.Methods The magnets for the linac and transport lines work at DC mode,whereas the magnets for the booster work at dynamic mode.So the module of OPERA/TOSCA is used to design the DC magnetic field and the module of OPERA/ELLEKTRA is used to design the dynamic magnetic field.The CAD programs are used to design the mechanical structures of the magnets.Results The magnetic field simulation results of all the magnets for the injector can meet the physical requirements,the mechanical designs of all magnets are reasonable,and engineering drawings of the magnets for production are finished.Conclusions Both the magnetic field design and mechanical design of all magnets are satisfied with the physical requirements of the HEPS injector;the production of all magnets has been started up.
