公开(公告)号：US09502959B2

公开(公告)日：2016-11-22

申请号：US14695855

申请日：2015-04-24

Applicant: ABB Technology AG

Inventor： Linda Juvonen ,  Mikko Routimo

IPC: H02J3/38 ,  H02M7/539 ,  H02M1/36 ,  H02M5/451 ,  G01R21/00 ,  G01R23/02 ,  G01R31/40 ,  H02M5/02

CPC classification number: H02M1/36 ,  G01R21/00 ,  G01R23/02 ,  G01R31/40 ,  H02J3/38 ,  H02J3/381 ,  H02J2003/388 ,  H02M5/02 ,  H02M5/451 ,  H02M7/539

Abstract: An exemplary method for detecting a three-phase islanding state in a three-phase electricity network includes supplying power to a three-phase electricity network via a power supply assembly, controlling an output frequency of the power supply assembly with a frequency reference signal adapted to deviate the output frequency of the power supply assembly from a grid frequency representing a frequency of a common electricity network whose portion of the three-phase electricity network is in normal operating conditions. The method also includes detecting a three-phase islanding state in the electricity network if the output frequency of the power supply assembly is outside an allowable value range. During a normal operating state of the electricity network, the frequency reference signal depends on an active output current of the power supply assembly.

Abstract translation: 用于检测三相电力网络中的三相孤岛状态的示例性方法包括经由电源组件向三相电力网络供电，用频率参考信号控制电源组件的输出频率，该频率参考信号适于 将电源组件的输出频率从表示三相电网的一部分处于正常工作状态的公共电网的频率的电网频率偏离。 该方法还包括如果电源组件的输出频率在允许值范围之外，则检测电网中的三相孤岛状态。 在电网的正常工作状态期间，频率参考信号取决于电源组件的有效输出电流。

公开(公告)号：US10031168B2

公开(公告)日：2018-07-24

申请号：US14671390

申请日：2015-03-27

Applicant: ABB Technology AG

Inventor： Linda Juvonen ,  Mikko Routimo

IPC: G01R23/00 ,  G01R23/12 ,  G01R23/15 ,  H02H3/46 ,  H02J3/38 ,  H02H1/00

Abstract: A method for single-phase islanding detection in a three-phase electricity network, can include supplying power into a three-phase electricity network (EN) by a power supply assembly (PSA), the electricity network (EN) having a network voltage, and providing a stimulus signal into a positive sequence electric quantity of the electricity network, the positive sequence electric quantity being current, power or a derived quantity thereof. A magnitude and/or a rate of change of an indicative element of a negative sequence component of the network voltage is monitored, a frequency domain of the indicative element including a frequency corresponding to the stimulus signal. A single phase islanding condition is detected in the electricity network (EN) if the magnitude and/or rate of change of the indicative element exceeds a predetermined limit value.