xThis study has as its objective to collaborate with the expansion in the market of electric energy in rural areas,offering as such an innovative prospect to the solution of associated problems through use of the asym...xThis study has as its objective to collaborate with the expansion in the market of electric energy in rural areas,offering as such an innovative prospect to the solution of associated problems through use of the asymmetric three-phase induction motor,supplied by a single-phase source.In this system,capacitor switching is applied during operation,while theoretical and practical results are presented for the application of this switching in a three-phase asymmetric induction motor of 20 hp.展开更多
The purpose of this paper is to show a laboratory scale implementation of a Thyristor Switched Capacitors （TSC） as an alternative for voltage regulation during a direct on line three-phase induction motor starting o...The purpose of this paper is to show a laboratory scale implementation of a Thyristor Switched Capacitors （TSC） as an alternative for voltage regulation during a direct on line three-phase induction motor starting on an emulated weak transmission line. Thyristor switched capacitor bank was chosen because it is a well known topology, considering the very nature of the direct starting induction motors, which represents a highly inductive load, the use of switched reactors becomes unnecessary. Such fact minimizes the introduction of harmonics components, and also reduces the cost of the implementation. The binary disposition of the banks allows a variable Var compensation with sixteen steps, in this case. The solution makes use of low cost devices combined with sliding window voltage and current measurement algorithm and a PI control with dead band control for achieve the shown experimental results, where the system is able to manage a typically 20% voltage drop, reducing it to less than 4%. The schematic of the developed circuit, the control technique and a quite simple method to calculate the binary weight capacitors banks are also presented.展开更多
前端由不控整流器供电的感应电机变频驱动系统中,直流侧电容容值高、体积大,从而系统可靠性降低。为了提高系统功率密度和可靠性,设计了一种带小电容二极管整流器供电感应电机变频驱动系统的新型复合控制器,其结构在磁场定向电机模型控...前端由不控整流器供电的感应电机变频驱动系统中,直流侧电容容值高、体积大,从而系统可靠性降低。为了提高系统功率密度和可靠性,设计了一种带小电容二极管整流器供电感应电机变频驱动系统的新型复合控制器,其结构在磁场定向电机模型控制的基础上结合使用了电压矢量边界控制模块,同时还采用了一种无速度传感器控制的转子位置估计算法。此外,还分析了控制算法对电机参数扰动的鲁棒性,并设计了状态滤波器。搭建了1.5 k W感应电机驱动试验平台,并采用20μF容值的电容进行了试验验证,试验结果表明了新型控制器的具有较好的性能。展开更多
文摘xThis study has as its objective to collaborate with the expansion in the market of electric energy in rural areas,offering as such an innovative prospect to the solution of associated problems through use of the asymmetric three-phase induction motor,supplied by a single-phase source.In this system,capacitor switching is applied during operation,while theoretical and practical results are presented for the application of this switching in a three-phase asymmetric induction motor of 20 hp.
文摘The purpose of this paper is to show a laboratory scale implementation of a Thyristor Switched Capacitors （TSC） as an alternative for voltage regulation during a direct on line three-phase induction motor starting on an emulated weak transmission line. Thyristor switched capacitor bank was chosen because it is a well known topology, considering the very nature of the direct starting induction motors, which represents a highly inductive load, the use of switched reactors becomes unnecessary. Such fact minimizes the introduction of harmonics components, and also reduces the cost of the implementation. The binary disposition of the banks allows a variable Var compensation with sixteen steps, in this case. The solution makes use of low cost devices combined with sliding window voltage and current measurement algorithm and a PI control with dead band control for achieve the shown experimental results, where the system is able to manage a typically 20% voltage drop, reducing it to less than 4%. The schematic of the developed circuit, the control technique and a quite simple method to calculate the binary weight capacitors banks are also presented.
文摘前端由不控整流器供电的感应电机变频驱动系统中,直流侧电容容值高、体积大,从而系统可靠性降低。为了提高系统功率密度和可靠性,设计了一种带小电容二极管整流器供电感应电机变频驱动系统的新型复合控制器,其结构在磁场定向电机模型控制的基础上结合使用了电压矢量边界控制模块,同时还采用了一种无速度传感器控制的转子位置估计算法。此外,还分析了控制算法对电机参数扰动的鲁棒性,并设计了状态滤波器。搭建了1.5 k W感应电机驱动试验平台,并采用20μF容值的电容进行了试验验证,试验结果表明了新型控制器的具有较好的性能。
