公开(公告)号：US20210396790A1

公开(公告)日：2021-12-23

申请号：US17467625

申请日：2021-09-07

Applicant: SMA Solar Technology AG

Inventor： Vitali Sakschewski ,  Thorsten Buelo ,  Florian Rauscher

IPC: G01R19/25 ,  G01R29/16 ,  G01R31/42 ,  G01R31/62

Abstract: The disclosure relates to a method and related device for approximately determining voltages at a high-voltage side of a transformer on the basis of measured voltages at a low-voltage side of the transformer. The method includes measuring delta voltages and phase voltages and phase angles at the low-voltage side of the transformer, transforming the phase voltages and phase angles into positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the low-voltage side, determining positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the high-voltage side from the positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the low-voltage side, determining estimated values of a zero phase sequence system voltage and of a phase angle of a zero phase sequence system at the high-voltage side from the measured delta voltages and phase voltages and phase angles at the low-voltage side, and transforming the positive, negative and zero phase sequence system voltages and the phase angles into phase voltages and/or delta voltages at the high-voltage side of the transformer.

公开(公告)号：US09046588B2

公开(公告)日：2015-06-02

申请号：US14105377

申请日：2013-12-13

Applicant: SMA Solar Technology AG

Inventor： Holger Behrends ,  Sebastian Bieniek ,  Thorsten Buelo ,  Markus Hopf ,  Gerd Bettenwort ,  Marcel Kratochvil ,  Christopher Merz ,  Oliver Prior

IPC: H02H3/00 ,  G01R31/40 ,  H02H1/00 ,  H01L31/02 ,  H02S50/10 ,  H02H7/20

CPC classification number: G01R31/40 ,  H01L31/02021 ,  H02H1/0015 ,  H02H7/20 ,  H02S50/10 ,  Y02E10/50

Abstract: A method for detecting an arc fault in a photovoltaic power circuit includes operating a photovoltaic generator at a first working point. A first signal related to a DC-current and/or a DC-voltage in the power circuit is determined. The first signal is analyzed and it is determined whether the signal indicates the presence of an electric arc in the power circuit. If so, the photovoltaic generator is operated at a second working point and a second signal related to the DC-current and/or the DC-voltage is determined. The first and second signals are then compared; and the occurrence of an arc fault in the power circuit is selectively signaled based on the comparison.

Abstract translation: 一种用于检测光伏电力电路中的电弧故障的方法包括在第一工作点处操作光伏发电机。 确定与电源电路中的直流电流和/或直流电压有关的第一信号。 对第一信号进行分析，确定信号是否指示电源电路中存在电弧。 如果是这样，则光伏发电机在第二工作点运行，并且确定与DC电流和/或DC电压相关的第二信号。 然后比较第一和第二信号; 并且基于该比较选择性地发信号通知电力电路中的电弧故障。

公开(公告)号：US11050255B2

公开(公告)日：2021-06-29

申请号：US15928507

申请日：2018-03-22

Applicant: SMA Solar Technology AG

Inventor： Denis Mende ,  Thorsten Buelo

IPC: H02J3/18 ,  H02J3/38

Abstract: A method and associated system for minimizing grid feedback of a PV park to an energy supply grid connected to a point of common coupling is disclosed, wherein the PV park has a plurality of inverters divided into groups. The method includes, for at least a first inverter of each group, determining a first parameter representative of a first coupling impedance between the first inverter and the point of common coupling and determining a second parameter representative of a second coupling impedance between the group containing the first inverter and the point of common coupling. The method further includes storing the first parameter and the second parameter in an operating control unit of the first inverter, and, in daytime operation of the PV park, feeding in reactive power by the first inverter depending on the first parameter, said reactive power corresponding to the magnitude of a reactive power drawn by the respective underlying first coupling impedance. The method also includes, in night-time operation, deactivating all the inverters of a group with the exception of the first inverter and feeding in reactive power by the first inverter depending on the second parameter, wherein the reactive power fed in corresponds to a magnitude of a reactive power drawn by the respective underlying second coupling impedance.

公开(公告)号：US20150153153A1

公开(公告)日：2015-06-04

申请号：US14571386

申请日：2014-12-16

Applicant: SMA Solar Technology AG

Inventor： Daniel Premm ,  Yehia Tarek Fawzy ,  Gerd Bettenwort ,  Claus Allert ,  Thorsten Buelo ,  Stijn Stevens

IPC: G01B7/28 ,  G05B13/02 ,  H02J13/00 ,  G01R31/42

CPC classification number: G01B7/28 ,  G01B2210/58 ,  G01R31/42 ,  G05B13/021 ,  H02J3/00 ,  H02J13/0017 ,  H02J2003/007 ,  Y02E60/76 ,  Y04S20/48 ,  Y04S40/22

Abstract: For determining the topology of a grid section of an AC power grid, the grid section comprising a grid connection point, at least one branch branching off from the grid connection point and including a plurality of energy consumption and/or energy generation units, and at least one measurement point in the at least one branch, dependencies of variations of a grid voltage measured at the at least one measurement point based on variations of connection power values of at least some individual ones of the energy consumption and/or energy generation units are determined.

Abstract translation: 为了确定交流电网的电网部分的拓扑，电网部分包括电网连接点，至少一个分支从电网连接点分支并包括多个能量消耗和/或能量产生单元，以及 至少一个分支中的至少一个测量点，基于能量消耗和/或能量产生单元中的至少一些个体的连接功率值的变化，在至少一个测量点测量的电网电压的变化的依赖性是 决心。

公开(公告)号：US11808794B2

公开(公告)日：2023-11-07

申请号：US17467625

申请日：2021-09-07

Applicant: SMA Solar Technology AG

Inventor： Vitali Sakschewski ,  Thorsten Buelo ,  Florian Rauscher

IPC: G01R19/25 ,  G01R31/62 ,  G01R29/16 ,  G01R31/42

CPC classification number: G01R19/2513 ,  G01R29/16 ,  G01R31/42 ,  G01R31/62

Abstract: The disclosure relates to a method and related device for approximately determining voltages at a high-voltage side of a transformer on the basis of measured voltages at a low-voltage side of the transformer. The method includes measuring delta voltages and phase voltages and phase angles at the low-voltage side of the transformer, transforming the phase voltages and phase angles into positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the low-voltage side, determining positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the high-voltage side from the positive and negative phase sequence system voltages and phase angles of the positive and negative phase sequence systems, respectively, at the low-voltage side, determining estimated values of a zero phase sequence system voltage and of a phase angle of a zero phase sequence system at the high-voltage side from the measured delta voltages and phase voltages and phase angles at the low-voltage side, and transforming the positive, negative and zero phase sequence system voltages and the phase angles into phase voltages and/or delta voltages at the high-voltage side of the transformer.

公开(公告)号：US10247537B2

公开(公告)日：2019-04-02

申请号：US14571386

申请日：2014-12-16

Applicant: SMA Solar Technology AG

Inventor： Daniel Premm ,  Yehia Tarek Fawzy ,  Gerd Bettenwort ,  Claus Allert ,  Thorsten Buelo ,  Stijn Stevens

IPC: G01B7/28 ,  H02J13/00 ,  G01R31/42 ,  G05B13/02 ,  H02J3/00

Abstract: For determining the topology of a grid section of an AC power grid, the grid section comprising a grid connection point, at least one branch branching off from the grid connection point and including a plurality of energy consumption and/or energy generation units, and at least one measurement point in the at least one branch, dependencies of variations of a grid voltage measured at the at least one measurement point based on variations of connection power values of at least some individual ones of the energy consumption and/or energy generation units are determined.

公开(公告)号：US20140119072A1

公开(公告)日：2014-05-01

申请号：US14105377

申请日：2013-12-13

Applicant: SMA Solar Technology AG

Inventor： Holger Behrends ,  Sebastian Bieniek ,  Thorsten Buelo ,  Markus Hopf ,  Gerd Bettenwort ,  Marcel Kratochvil ,  Christopher Merz ,  Oliver Prior

IPC: G01R31/40

CPC classification number: G01R31/40 ,  H01L31/02021 ,  H02H1/0015 ,  H02H7/20 ,  H02S50/10 ,  Y02E10/50

Abstract: A method for detecting an arc fault in a photovoltaic power circuit includes operating a photovoltaic generator at a first working point. A first signal related to a DC-current and/or a DC-voltage in the power circuit is determined. The first signal is analyzed and it is determined whether the signal indicates the presence of an electric arc in the power circuit. If so, the photovoltaic generator is operated at a second working point and a second signal related to the DC-current and/or the DC-voltage is determined. The first and second signals are then compared; and the occurrence of an arc fault in the power circuit is selectively signaled based on the comparison.

Abstract translation: 一种用于检测光伏电力电路中的电弧故障的方法包括在第一工作点处操作光伏发电机。 确定与电源电路中的直流电流和/或直流电压有关的第一信号。 对第一信号进行分析，确定信号是否指示电源电路中存在电弧。 如果是这样，则光伏发电机在第二工作点运行，并且确定与DC电流和/或DC电压有关的第二信号。 然后比较第一和第二信号; 并且基于该比较选择性地发信号通知电力电路中的电弧故障。