To improve the living standards,economical efficiency and environmental protection of isolated islands,remote areas and other areas with weak electric power facilities construction,a multi-source independent microgrid...To improve the living standards,economical efficiency and environmental protection of isolated islands,remote areas and other areas with weak electric power facilities construction,a multi-source independent microgrid system is studied,including diesel generators,photovoltaic power generation system,wind power generation system and energy storage unit.Meanwhile,in order to realize the voltage and frequency stability control of AC bus of multisource microgrid,the virtual synchronous generator technology is introduced into the energy storage unit,and the charge and discharge control of the energy storage battery are simulated as the control behavior characteristics of synchronous motors,so as to provide damping and inertia support for the microgrid.The operation mode and control principle of each energy subsystem are expounded and analyzed.The algorithm principle of virtual synchronous generator and the control method of energy storage unit are given.Then,the working modes of the microgrid system under different environmental conditions are analyzed,and the multi-source microgrid system simulation model is built based on MATLAB/Simulink.The simulation results show that the microgrid system can run stably under different working modes and the energy storage unit using the virtual synchronous generator technology can provide good voltage and frequency support for the microgrid system.Finally,experiments verify the supporting function of energy storage unit on the voltage and frequency of the microgrid system.展开更多
Cascaded multilevel converters built with integrated modules have many advantages such as increased power density,flexible distributed control,multi-functionality,increased reliability and short design cycles.However,...Cascaded multilevel converters built with integrated modules have many advantages such as increased power density,flexible distributed control,multi-functionality,increased reliability and short design cycles.However,the system performance will be affected due to the synchronization errors among each integrated modules.This paper analyzes the impact of the three kinds of synchronization errors on the whole system performance,as well as detailed synchronization implementation.Some valuable conclusions are derived from the theoretical analysis,simulations and experimental results.展开更多
Synchronized acoustic-articulatory data is the basis of various applications,such as exploring the fundamental mechanisms of speech production,acoustic to articulatory inversion(AAI),and articulatory to acoustic mappi...Synchronized acoustic-articulatory data is the basis of various applications,such as exploring the fundamental mechanisms of speech production,acoustic to articulatory inversion(AAI),and articulatory to acoustic mapping(AAM).Numerous studies have been conducted based on the synchronized ElectroMagnetic Articulograhy(EMA)data and acoustic data.Hence,it is necessary to make clear whether the EMA-synchronized speech and stand-alone speech are different,and if so,how it affects the performance of the applications that are based on synchronized acoustic-articulatory data.In this study,we compare the differences between EMA-synchronized speech and stand-alone speech from the aspect of speech recognition based on the data of a male speaker.It is found that:i)the general error rate of EMA-synchronized speech is much higher than that of stand-alone speech;ii)apical vowels and apical/blade consonants are more significantly affected by the presence of EMA coils;iii)parts of vowel and consonant tokens are confused with the sounds who use the same articulator or the articulators nearby,such as confusion among apical vowels and confusion among apical and blade consonants;iv)the confusion of labial tokens demonstrates a diverse pattern.展开更多
基金supported by the Science and Technology Research&Development Project of China Construction Second Engineering Bureau Ltd.(No.91110000100024296D180009)。
文摘To improve the living standards,economical efficiency and environmental protection of isolated islands,remote areas and other areas with weak electric power facilities construction,a multi-source independent microgrid system is studied,including diesel generators,photovoltaic power generation system,wind power generation system and energy storage unit.Meanwhile,in order to realize the voltage and frequency stability control of AC bus of multisource microgrid,the virtual synchronous generator technology is introduced into the energy storage unit,and the charge and discharge control of the energy storage battery are simulated as the control behavior characteristics of synchronous motors,so as to provide damping and inertia support for the microgrid.The operation mode and control principle of each energy subsystem are expounded and analyzed.The algorithm principle of virtual synchronous generator and the control method of energy storage unit are given.Then,the working modes of the microgrid system under different environmental conditions are analyzed,and the multi-source microgrid system simulation model is built based on MATLAB/Simulink.The simulation results show that the microgrid system can run stably under different working modes and the energy storage unit using the virtual synchronous generator technology can provide good voltage and frequency support for the microgrid system.Finally,experiments verify the supporting function of energy storage unit on the voltage and frequency of the microgrid system.
基金Project supported by the National Natural Science Foundation of China (No. 50277035)the Natural Science Foundation of Zheji-ang Province (No. Z104441),China
文摘Cascaded multilevel converters built with integrated modules have many advantages such as increased power density,flexible distributed control,multi-functionality,increased reliability and short design cycles.However,the system performance will be affected due to the synchronization errors among each integrated modules.This paper analyzes the impact of the three kinds of synchronization errors on the whole system performance,as well as detailed synchronization implementation.Some valuable conclusions are derived from the theoretical analysis,simulations and experimental results.
基金supported by the National Natural Science Foundation of China(No.61977049)Advanced Innovation Center for Language Resource and Intelligence(KYR17005)
文摘Synchronized acoustic-articulatory data is the basis of various applications,such as exploring the fundamental mechanisms of speech production,acoustic to articulatory inversion(AAI),and articulatory to acoustic mapping(AAM).Numerous studies have been conducted based on the synchronized ElectroMagnetic Articulograhy(EMA)data and acoustic data.Hence,it is necessary to make clear whether the EMA-synchronized speech and stand-alone speech are different,and if so,how it affects the performance of the applications that are based on synchronized acoustic-articulatory data.In this study,we compare the differences between EMA-synchronized speech and stand-alone speech from the aspect of speech recognition based on the data of a male speaker.It is found that:i)the general error rate of EMA-synchronized speech is much higher than that of stand-alone speech;ii)apical vowels and apical/blade consonants are more significantly affected by the presence of EMA coils;iii)parts of vowel and consonant tokens are confused with the sounds who use the same articulator or the articulators nearby,such as confusion among apical vowels and confusion among apical and blade consonants;iv)the confusion of labial tokens demonstrates a diverse pattern.
