往复式内燃机驱动发电机在实际使用中有两种工况,即额定负载连续运行和长时间过载运行。后一种工况,因长时间过载电机温升将超过允许的限值,必然会缩短电机的使用寿命。这种情况的实质是牺牲电机使用寿命以适应实际运行的需要。IEC/TC2...往复式内燃机驱动发电机在实际使用中有两种工况,即额定负载连续运行和长时间过载运行。后一种工况,因长时间过载电机温升将超过允许的限值,必然会缩短电机的使用寿命。这种情况的实质是牺牲电机使用寿命以适应实际运行的需要。IEC/TC2在研究此项标准化工作时,结合其它类型电机(包括电动机)的实际运行需要,提出了一种既适用于发电机也适用于电动机的新工作制——离散恒定负载工作制S10(Duty with discreteconstant loads——Duty type S10),现已正式纳入第9版IEC34—1标准。为使我国国标与国际标准协调一致,相应国标GB755也将增加这部分内容,下面把S10工作制简要作一介绍。展开更多
在多变换器电力电子系统中,负载变换器可以等效为前级变换器的恒定功率负载CPL(constant power load),这给系统带来了等效负电阻,导致系统不稳定,而采用主动阻尼的方法能够解决这个问题,并且不产生额外功耗,故根据主动阻尼方法改进了Buc...在多变换器电力电子系统中,负载变换器可以等效为前级变换器的恒定功率负载CPL(constant power load),这给系统带来了等效负电阻,导致系统不稳定,而采用主动阻尼的方法能够解决这个问题,并且不产生额外功耗,故根据主动阻尼方法改进了Buck DC/DC开关变换器。展开更多
Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing num...Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing number of on-board power electronic based devices,the distribution system of the aircraft can be regarded as an onboard microgrid.As it is known that the load power electronic converters can exhibit constant power load(CPL)characteristics and reduce the system stability,it is necessary to accurately predict and enhance the system stability in designing process.This paper firstly analyzes the stability of an on-board DC microgrid with the presence of CPL.Then,discusses the reasons behind instability and proposes a control strategy to enhance system stability.Finally,the simulation results are worked out to validate the analysis and the effect of the proposed control strategy.展开更多
文摘往复式内燃机驱动发电机在实际使用中有两种工况,即额定负载连续运行和长时间过载运行。后一种工况,因长时间过载电机温升将超过允许的限值,必然会缩短电机的使用寿命。这种情况的实质是牺牲电机使用寿命以适应实际运行的需要。IEC/TC2在研究此项标准化工作时,结合其它类型电机(包括电动机)的实际运行需要,提出了一种既适用于发电机也适用于电动机的新工作制——离散恒定负载工作制S10(Duty with discreteconstant loads——Duty type S10),现已正式纳入第9版IEC34—1标准。为使我国国标与国际标准协调一致,相应国标GB755也将增加这部分内容,下面把S10工作制简要作一介绍。
基金supported by Ministry of Science&Technology under National Key R&D Program of China(No.2021YFE0108600)Ningbo Science and Technology Bureau under S&T Innovation 2025 Major Special Program(No.2019B10071)Key International Cooperation of National Natural Science Foundation of China(No.51920105011)。
文摘Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing number of on-board power electronic based devices,the distribution system of the aircraft can be regarded as an onboard microgrid.As it is known that the load power electronic converters can exhibit constant power load(CPL)characteristics and reduce the system stability,it is necessary to accurately predict and enhance the system stability in designing process.This paper firstly analyzes the stability of an on-board DC microgrid with the presence of CPL.Then,discusses the reasons behind instability and proposes a control strategy to enhance system stability.Finally,the simulation results are worked out to validate the analysis and the effect of the proposed control strategy.
