High precise, high voltage pulse generator made up of high-power IGBT and pulse transformers controlled by a computer are described. A simple main circuit topology employed in this pulse generator can reduce the cost ...High precise, high voltage pulse generator made up of high-power IGBT and pulse transformers controlled by a computer are described. A simple main circuit topology employed in this pulse generator can reduce the cost meanwhile it still meets special requirements for pulsed electric fields (PEFs) in food process. The pulse generator utilizes a complex programmable logic device (CPLD) to generate trigger signals. Pulse-frequency, pulse-width and pulse-number are controlled via RS232 bus by a computer. The high voltage pulse generator well suits to the application for fluid food non-thermal effect in pulsed electric fields, for it can increase and decrease by the step length 1.展开更多
A sinusoidal voltage wave generator is proposed based on the use of micro-processor digital signals with programmable duty-cycles, with application to real-time Electrical Cell-substrate Impedance Spectroscopy (ECIS) ...A sinusoidal voltage wave generator is proposed based on the use of micro-processor digital signals with programmable duty-cycles, with application to real-time Electrical Cell-substrate Impedance Spectroscopy (ECIS) assays in cell cultures. The working principle relies on the time convolution of the programmed microcontroller (μC) digital signals. The expected frequency is easily tuned on the bio-impedance spectroscopy range [100 Hz, 1 MHz] thanks to the μC clock frequency selection. This system has been simulated and tested on the 8 bits μC Arduino<sup>TM </sup>Uno with ATmega328 version. Results obtained prove that only three digital signals are required to fit the general specification in ECIS experiments, below 1% THD accuracy, and show the appropriateness of the system for the real-time monitoring of this type of biological experiments.展开更多
The present paper addresses an advanced teaching lab consisting of setting up an islanded production unit. This teaching lab takes place in the very last semester at master level for students in electrical engineering...The present paper addresses an advanced teaching lab consisting of setting up an islanded production unit. This teaching lab takes place in the very last semester at master level for students in electrical engineering with energy specialization. The purpose of this teaching lab is to combine knowledge learned in different areas such as power electronics, control, electrical machines and networks, and make use of all of them in practice. The present paper describes in detail the different steps followed by the student to set up an islanded production unit.展开更多
This paper presents a low power and high efficiency high voltage generator circuit embedded in electrically erasable programmable read-only memory（EEPROM）.The low power is minimized by a capacitance divider circuit ...This paper presents a low power and high efficiency high voltage generator circuit embedded in electrically erasable programmable read-only memory（EEPROM）.The low power is minimized by a capacitance divider circuit and a regulator circuit using the controlling clock switch technique.The high efficiency is dependent on the zero threshold voltage（V_（th）） MOSFET and the charge transfer switch（CTS） charge pump.The proposed high voltage generator circuit has been implemented in a 0.35μm EEPROM CMOS process.Measured results show that the proposed high voltage generator circuit has a low power consumption of about 150.48μW and a higher pumping efficiency（83.3%） than previously reported circuits.This high voltage generator circuit can also be widely used in low-power flash devices due to its high efficiency and low power dissipation.展开更多
This paper presented a novel wide-area nonlinear excitation control strategy for multi-machine power systems.A simple and effective model transformation method was proposed for the system's mathematical model in t...This paper presented a novel wide-area nonlinear excitation control strategy for multi-machine power systems.A simple and effective model transformation method was proposed for the system's mathematical model in the COI(center of inertia)coordinate system.The system was transformed to an uncertain linear one where deviation of generator terminal voltage became one of the new state variables.Then a wide-area nonlinear robust voltage controller was designed utilizing a LMI(linear matrix inequality)based robust control theory.The proposed controller does not rely on any preselected system operating point,adapts to variations of network parameters and system operation conditions,and assures regulation accuracy of generator terminal voltages.Neither rotor angle nor any variable's differentiation needs to be measured for the proposed controller,and only terminal voltages,rotor speeds,active and reactive power outputs of generators are required.In addition,the proposed controller not only takes into account time delays of remote signals,but also eliminates the effect of wide-area information's incompleteness when not all generators are equipped with PMU(phase measurement unit).Detailed tests were conducted by PSCAD/EMTDC for a three-machine and four-machine power systems respectively,and simulation results illustrate high performance of the proposed controller.展开更多
文摘High precise, high voltage pulse generator made up of high-power IGBT and pulse transformers controlled by a computer are described. A simple main circuit topology employed in this pulse generator can reduce the cost meanwhile it still meets special requirements for pulsed electric fields (PEFs) in food process. The pulse generator utilizes a complex programmable logic device (CPLD) to generate trigger signals. Pulse-frequency, pulse-width and pulse-number are controlled via RS232 bus by a computer. The high voltage pulse generator well suits to the application for fluid food non-thermal effect in pulsed electric fields, for it can increase and decrease by the step length 1.
文摘A sinusoidal voltage wave generator is proposed based on the use of micro-processor digital signals with programmable duty-cycles, with application to real-time Electrical Cell-substrate Impedance Spectroscopy (ECIS) assays in cell cultures. The working principle relies on the time convolution of the programmed microcontroller (μC) digital signals. The expected frequency is easily tuned on the bio-impedance spectroscopy range [100 Hz, 1 MHz] thanks to the μC clock frequency selection. This system has been simulated and tested on the 8 bits μC Arduino<sup>TM </sup>Uno with ATmega328 version. Results obtained prove that only three digital signals are required to fit the general specification in ECIS experiments, below 1% THD accuracy, and show the appropriateness of the system for the real-time monitoring of this type of biological experiments.
文摘The present paper addresses an advanced teaching lab consisting of setting up an islanded production unit. This teaching lab takes place in the very last semester at master level for students in electrical engineering with energy specialization. The purpose of this teaching lab is to combine knowledge learned in different areas such as power electronics, control, electrical machines and networks, and make use of all of them in practice. The present paper describes in detail the different steps followed by the student to set up an islanded production unit.
基金supported by the National Natural Science Foundation of China(No.61072010)
文摘This paper presents a low power and high efficiency high voltage generator circuit embedded in electrically erasable programmable read-only memory（EEPROM）.The low power is minimized by a capacitance divider circuit and a regulator circuit using the controlling clock switch technique.The high efficiency is dependent on the zero threshold voltage（V_（th）） MOSFET and the charge transfer switch（CTS） charge pump.The proposed high voltage generator circuit has been implemented in a 0.35μm EEPROM CMOS process.Measured results show that the proposed high voltage generator circuit has a low power consumption of about 150.48μW and a higher pumping efficiency（83.3%） than previously reported circuits.This high voltage generator circuit can also be widely used in low-power flash devices due to its high efficiency and low power dissipation.
文摘This paper presented a novel wide-area nonlinear excitation control strategy for multi-machine power systems.A simple and effective model transformation method was proposed for the system's mathematical model in the COI(center of inertia)coordinate system.The system was transformed to an uncertain linear one where deviation of generator terminal voltage became one of the new state variables.Then a wide-area nonlinear robust voltage controller was designed utilizing a LMI(linear matrix inequality)based robust control theory.The proposed controller does not rely on any preselected system operating point,adapts to variations of network parameters and system operation conditions,and assures regulation accuracy of generator terminal voltages.Neither rotor angle nor any variable's differentiation needs to be measured for the proposed controller,and only terminal voltages,rotor speeds,active and reactive power outputs of generators are required.In addition,the proposed controller not only takes into account time delays of remote signals,but also eliminates the effect of wide-area information's incompleteness when not all generators are equipped with PMU(phase measurement unit).Detailed tests were conducted by PSCAD/EMTDC for a three-machine and four-machine power systems respectively,and simulation results illustrate high performance of the proposed controller.
