公开(公告)号：US20060250154A1

公开(公告)日：2006-11-09

申请号：US11125352

申请日：2005-05-09

申请人： Zhi Gao ,  Thomas Habetler ,  Ronald Harley ,  Roy Colby

发明人： Zhi Gao ,  Thomas Habetler ,  Ronald Harley ,  Roy Colby

IPC分类号： G01R31/34

CPC分类号： G01R31/343 ,  H02H6/005 ,  H02H7/085

摘要： An induction motor having a rotor and a stator is protected during running overloads by connecting the motor to an overload protection relay that can be tripped to interrupt power to the motor in the event of an overload, tracking the stator winding temperature of the motor during running overloads with a hybrid thermal model by online adjustment in the hybrid thermal model, and tripping the overload protection relay in response to a predetermined running overload condition represented by the tracked stator winding temperature. In one embodiment of the invention, the stator winding temperature is tracked by use of an online hybrid thermal model that uses the resistance of the rotor as an indicator of rotor temperature and thus of the thermal operating conditions of the motor. The hybrid thermal model incorporates rotor losses and heat transfer between the rotor and the stator, and approximates the thermal characteristics of the rotor and stator.

公开(公告)号：US20060173640A1

公开(公告)日：2006-08-03

申请号：US11337630

申请日：2006-01-23

申请人： Ronald Harley ,  Deepakraj Divan ,  Franklin Lambert ,  Joy Mazumdar

发明人： Ronald Harley ,  Deepakraj Divan ,  Franklin Lambert ,  Joy Mazumdar

IPC分类号： G01R15/00

CPC分类号： H02M1/12 ,  Y10S706/915

摘要： A system and method for determining non-linear load harmonics impact on the voltage distortion at the point of common coupling is disclosed. Briefly described, one embodiment is a method comprising metering voltage on an electric power system; metering current on the electric power system; determining a predicted voltage based upon the metered current; comparing the predicted voltage with the metered voltage; and determining a harmonic voltage component using a plurality of weights determined when the predicted voltage converges with the metered voltage.

摘要翻译： 公开了用于确定非线性负载谐波对公共耦合点处的电压失真的影响的系统和方法。 简要描述，一个实施例是一种方法，其包括在电力系统上计量电压; 电力系统上的计量电流; 基于计量电流确定预测电压; 将预测电压与计量电压进行比较; 以及使用当预测电压与计量电压收敛时确定的多个权重来确定谐波电压分量。

公开(公告)号：US20050057265A1

公开(公告)日：2005-03-17

申请号：US10940101

申请日：2004-09-14

申请人： Ronald Harley ,  Thomas Habelter ,  Franklin Lambert ,  Joy Mazumdar

发明人： Ronald Harley ,  Thomas Habelter ,  Franklin Lambert ,  Joy Mazumdar

IPC分类号： G01R20060101 ,  H02M1/12

CPC分类号： H02M1/12 ,  Y10S706/915

摘要： A system and method for determining harmonics caused by non-linear loads are disclosed. Briefly described, one embodiment is a method comprising metering voltage on an electric power system; metering current on the electric power system; determining a predicted current based upon the metered voltage; comparing the predicted current with the metered current; and determining a harmonic current component using a plurality of weights determined when the predicted current converges with the metered current.

摘要翻译： 公开了一种用于确定由非线性负载引起的谐波的系统和方法。 简要描述，一个实施例是一种方法，其包括在电力系统上计量电压; 电力系统上的计量电流; 基于计量电压确定预测电流; 将预测电流与计量电流进行比较; 以及使用当预测电流与计量电流收敛时确定的多个权重来确定谐波电流分量。