There are the application scope limits for single differential-mode current injection test method, so in order to carry out injection susceptibility test for two-pieces equipment interconnected with both ends of a cab...There are the application scope limits for single differential-mode current injection test method, so in order to carry out injection susceptibility test for two-pieces equipment interconnected with both ends of a cable simultaneously, a double differential-mode current in- jection test method (DDMCI) is proposed. The method adopted the equivalence source wave theorem and Baum-Liu-Tesche(BLT) equation as its theory foundation. The equivalent corresponding relation between injection voltage and radiation electric field intensity is derived, and the phase relation between the two injection voltage sources is confirmed. The results indicate that the amplitude and phase of the equivalent injection voltage source is closely related to the S parameter of directional coupling device, the transmission line length, and the source vector in BLT equation, but has nothing to do with the reflection coefficient between the two equipment pieces. Therefore, by choosing the right amplitude and phase of the double injection voltage sources, the DDMCI test is equivalent to the radiation test for two interconnected equipment of a system.展开更多
逆变器中死区时间会带来电流谐波和转矩脉动,从而导致感应电机出现明显振动并增加额外损耗。为减少逆变器死区效应带来的不利影响,提出一种基于高阶扩展状态观测器(high-order extended state observer,HO-ESO)的逆变器死区效应在线补...逆变器中死区时间会带来电流谐波和转矩脉动,从而导致感应电机出现明显振动并增加额外损耗。为减少逆变器死区效应带来的不利影响,提出一种基于高阶扩展状态观测器(high-order extended state observer,HO-ESO)的逆变器死区效应在线补偿方法。首先,对逆变器死区效应进行分析,推导出因死区效应而产生的d、q轴误差电压方程。接着,对传统的基于二阶ESO的死区效应补偿方法进行介绍和分析,由分析结果可知,该方法难以准确估计误差电压,从而导致补偿效果欠佳。进一步,设计一种HO-ESO对误差电压进行估计,并将其补偿到感应电机矢量控制系统中。最后,利用仿真和实验测试对所研究的死区效应补偿方法进行验证,并与传统的基于二阶ESO的死区效应补偿法进行对比。测试结果表明,相较于传统基于二阶ESO的死区效应补偿方法,所研究方法表现出更好的死区效应补偿性能。此外,所研究方法无需检测电流极性,易于实施。展开更多
面向工业、国防及重大科学研究领域超大电流在线计量的迫切需求,提出基于光纤电流传感器量程自扩展特性实现超大电流计量标准的量值传递。基于微分琼斯矩阵方法,建立了光纤敏感环路的数学模型,揭示了线性双折射对传感器量程自扩展特性...面向工业、国防及重大科学研究领域超大电流在线计量的迫切需求,提出基于光纤电流传感器量程自扩展特性实现超大电流计量标准的量值传递。基于微分琼斯矩阵方法,建立了光纤敏感环路的数学模型,揭示了线性双折射对传感器量程自扩展特性的影响机理,并证明了采用椭圆双折射光纤的电流传感器具有良好的量程自扩展能力,可通过光纤圈数对Faraday效应的比例放大作用,利用小电流实现传感器在超大电流下的等效校准。研制了干涉式数字闭环柔性光纤电流传感器,可在不断开载流母线的情况下直接形成敏感环路,实现在线计量。样机性能测试结果表明:在直流等效10~210 k A范围内,样机的测量准确度优于±0.1%;在工频额定等效25 k A条件下,样机的比差准确度满足IEC60044-8 0.2 S级要求;样机的带宽大于10 k Hz。展开更多
基金Project supported by Arm Pre-research Program （51333040101）, National Defense 973 Program （6131380301 ）, National Natural Science Foundation of China （61040003）.
文摘There are the application scope limits for single differential-mode current injection test method, so in order to carry out injection susceptibility test for two-pieces equipment interconnected with both ends of a cable simultaneously, a double differential-mode current in- jection test method (DDMCI) is proposed. The method adopted the equivalence source wave theorem and Baum-Liu-Tesche(BLT) equation as its theory foundation. The equivalent corresponding relation between injection voltage and radiation electric field intensity is derived, and the phase relation between the two injection voltage sources is confirmed. The results indicate that the amplitude and phase of the equivalent injection voltage source is closely related to the S parameter of directional coupling device, the transmission line length, and the source vector in BLT equation, but has nothing to do with the reflection coefficient between the two equipment pieces. Therefore, by choosing the right amplitude and phase of the double injection voltage sources, the DDMCI test is equivalent to the radiation test for two interconnected equipment of a system.
文摘逆变器中死区时间会带来电流谐波和转矩脉动,从而导致感应电机出现明显振动并增加额外损耗。为减少逆变器死区效应带来的不利影响,提出一种基于高阶扩展状态观测器(high-order extended state observer,HO-ESO)的逆变器死区效应在线补偿方法。首先,对逆变器死区效应进行分析,推导出因死区效应而产生的d、q轴误差电压方程。接着,对传统的基于二阶ESO的死区效应补偿方法进行介绍和分析,由分析结果可知,该方法难以准确估计误差电压,从而导致补偿效果欠佳。进一步,设计一种HO-ESO对误差电压进行估计,并将其补偿到感应电机矢量控制系统中。最后,利用仿真和实验测试对所研究的死区效应补偿方法进行验证,并与传统的基于二阶ESO的死区效应补偿法进行对比。测试结果表明,相较于传统基于二阶ESO的死区效应补偿方法,所研究方法表现出更好的死区效应补偿性能。此外,所研究方法无需检测电流极性,易于实施。
文摘面向工业、国防及重大科学研究领域超大电流在线计量的迫切需求,提出基于光纤电流传感器量程自扩展特性实现超大电流计量标准的量值传递。基于微分琼斯矩阵方法,建立了光纤敏感环路的数学模型,揭示了线性双折射对传感器量程自扩展特性的影响机理,并证明了采用椭圆双折射光纤的电流传感器具有良好的量程自扩展能力,可通过光纤圈数对Faraday效应的比例放大作用,利用小电流实现传感器在超大电流下的等效校准。研制了干涉式数字闭环柔性光纤电流传感器,可在不断开载流母线的情况下直接形成敏感环路,实现在线计量。样机性能测试结果表明:在直流等效10~210 k A范围内,样机的测量准确度优于±0.1%;在工频额定等效25 k A条件下,样机的比差准确度满足IEC60044-8 0.2 S级要求;样机的带宽大于10 k Hz。
