公开(公告)号：US20200274459A1

公开(公告)日：2020-08-27

申请号：US15930666

申请日：2020-05-13

Applicant: SMA Solar Technology AG

Inventor： Daniel Premm ,  Vitali Sakschewski

IPC: H02M7/44 ,  H02J3/38 ,  H02J3/18

Abstract: A method and associated apparatus for feeding electric power from a photovoltaic system via a grid connection point into an AC grid having a low short-circuit power is disclosed. The method includes connecting a DC voltage side of at least one first inverter of the photovoltaic system to a photovoltaic generator and an AC voltage side of the at least one first inverter to the grid connection point, wherein the at least one first inverter is operated as a current source, and connecting an AC voltage side of a second inverter of the photovoltaic system to the grid connection point, wherein the second inverter is operated as a voltage source based on measurement values of an AC voltage measured in the region of the photovoltaic system and a predefined characteristic curve. For a first total short-circuit power of all first inverters operated as a current source, and a second total short-circuit power of the AC grid and of the second inverter operated as a voltage source, a ratio of the second total short-circuit power to the first total short-circuit power is greater than or equal to 2.

公开(公告)号：US10027123B2

公开(公告)日：2018-07-17

申请号：US14571481

申请日：2014-12-16

Applicant: SMA Solar Technology AG

Inventor： Yehia Tarek Fawzy ,  Daniel Premm ,  Vitali Sakschewski ,  Stijn Stevens ,  Christian Tschendel

IPC: H02J1/00 ,  H02J3/38 ,  H02J3/18 ,  H02M7/44

Abstract: In order to control a plurality of inverters, which are connected on their input side to a current source each and on their output side to a common grid connection point, electrical variables are measured at the individual inverters and are used for controlling the individual inverters, currents being output by the individual inverters depending on the electrical variables measured at the location of the individual inverters Effects of the connection equipment between the individual inverters and the common grid connection point on currents are determined, electrical variables being measured at the grid connection point and are set in relation to the electrical variables measured at the same time at the individual inverters. The connection equipment between the individual inverters and the common grid connection point is taken into consideration in controlling the individual inverters.

公开(公告)号：US11557899B2

公开(公告)日：2023-01-17

申请号：US15930666

申请日：2020-05-13

Applicant: SMA Solar Technology AG

Inventor： Daniel Premm ,  Vitali Sakschewski

IPC: H02J3/16 ,  H02M7/44 ,  H02J3/18 ,  H02J3/38 ,  H02J3/50 ,  H02J3/48 ,  H02J3/40

Abstract: A method and associated apparatus for feeding electric power from a photovoltaic system via a grid connection point into an AC grid having a low short-circuit power is disclosed. The method includes connecting a DC voltage side of at least one first inverter of the photovoltaic system to a photovoltaic generator and an AC voltage side of the at least one first inverter to the grid connection point, wherein the at least one first inverter is operated as a current source, and connecting an AC voltage side of a second inverter of the photovoltaic system to the grid connection point, wherein the second inverter is operated as a voltage source based on measurement values of an AC voltage measured in the region of the photovoltaic system and a predefined characteristic curve. For a first total short-circuit power of all first inverters operated as a current source, and a second total short-circuit power of the AC grid and of the second inverter operated as a voltage source, a ratio of the second total short-circuit power to the first total short-circuit power is greater than or equal to 2.

公开(公告)号：US09106152B2

公开(公告)日：2015-08-11

申请号：US13772660

申请日：2013-02-21

Applicant: SMA Solar Technology AG

Inventor： Karel De Brabandere ,  Vitali Sakschewski ,  Lars Cramer ,  Yehia Tarek Fawzy ,  Stijn Stevens ,  Daniel Premm

IPC: H02M7/537 ,  H02M7/44 ,  H02J3/38

CPC classification number: H02M7/44 ,  H02J3/383 ,  Y02E10/563

Abstract: A method for grid support by means of an inverter is disclosed, wherein the grid is supported by feeding in compensation currents. The method includes measuring a prevailing grid state, and breaking down voltages measured for measuring the prevailing grid state into symmetrical components of the grid state including positive sequence system components and negative sequence system components. The method further includes determining symmetrical components of a compensation current including positive sequence system components and negative sequence system components of the compensation current as functions of deviations of the positive sequence system components and negative sequence system components of the grid state from reference values, and feeding-in a compensation current as the vector sum of the determined symmetrical components of the compensation current.

Abstract translation: 公开了一种通过逆变器进行电网支持的方法，其中通过馈送补偿电流来支持电网。 该方法包括测量主要的电网状态，以及将测量的主要电网状态的电压分解成电网状态的对称分量，包括正序系统分量和负序系统分量。 该方法还包括确定补偿电流的对称分量，其包括补偿电流的正序列系统分量和负序系统分量，作为电网状态的正序列系统分量和负序系统分量与参考值的偏差的函数，以及馈送 - 在补偿电流中作为确定的对称分量的补偿电流的矢量和。

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：US09590527B2

公开(公告)日：2017-03-07

申请号：US14855808

申请日：2015-09-16

Applicant: SMA Solar Technology AG

Inventor： Vitali Sakschewski ,  Stijn Stevens ,  Christian Hardt

IPC: H02M1/08 ,  H02M7/44 ,  H02J3/38 ,  H02M7/5387 ,  H02M1/32

CPC classification number: H02M7/44 ,  H02J3/383 ,  H02M1/32 ,  H02M7/53875 ,  Y02E10/563

Abstract: A method for operating an inverter which is connected to an energy supply grid via a transformer for feeding in electrical energy into the energy supply grid, includes measuring output currents and output voltages of the inverter, and actuating power switches of the inverter using actuation signals that are generated as a function of the measured output currents and the measured output voltages at a fundamental frequency of the energy supply grid. The actuation signals are further generated as a function of a harmonic component of the measured output voltages of the inverter at a multiple of the fundamental frequency using a control loop with positive feedback.

Abstract translation: 一种用于操作变频器的方法，所述逆变器通过变压器连接到能量供应电网以将电能馈送到所述能量供应电网中，包括测量所述逆变器的输出电流和输出电压，以及使用致动信号致动所述逆变器的功率开关 作为测量的输出电流和测量的输出电压在能量供应网格的基频处的函数产生。 使用具有正反馈的控制回路，进一步产生致动信号作为以基频倍数的测量的输出电压的谐波分量的函数。

公开(公告)号：US20160252588A1

公开(公告)日：2016-09-01

申请号：US15138412

申请日：2016-04-26

Applicant: SMA Solar Technology AG

Inventor： Stijn Stevens ,  Vitali Sakschewski

IPC: G01R31/40

CPC classification number: G01R31/40 ,  H02J3/383 ,  H02J3/386 ,  H02J3/387 ,  H02J2003/388 ,  H02M1/32 ,  H02M7/48 ,  Y02E10/563 ,  Y02E10/763

Abstract: The disclosure relates to a detection method for an inverter for detecting a grid fault in a power supply grid, includes determining a grid impedance (Z) and/or the rate of change thereof with respect to time (dZ/dt) and/or a rate of change of an absolute value of the grid impedance (Z) with respect to time (d|Z|/dt), comparing the absolute value and/or a real part and/or an imaginary part of the grid impedance (Z) and/or the rate of change thereof with respect to time (dZ/dt) and/or the rate of change of the absolute value of the grid impedance (Z) with respect to time (d|Z|/dt) with respective predetermined limit values. The method also includes detecting a grid fault state based on the comparison, wherein a distinction is drawn between an islanding situation (AID) and a fault ride through (FRT) situation, and signaling an existing islanding situation (AID) or a fault ride through (FRT) situation as a grid fault state. The disclosure additionally relates to an inverter that is arranged to perform the method.

Abstract translation: 本发明涉及一种用于检测电力网格中的电网故障的逆变器的检测方法，包括确定电网阻抗（Z）和/或其相对于时间（dZ / dt）的变化率和/或 将电网阻抗（Z）的绝对值相对于时间（d | Z | / dt）的变化率与电网阻抗（Z）的绝对值和/或实部和/或虚部进行比较， 和/或其相对于时间（dZ / dt）的变化率和/或相对于时间（d | Z | / dt）的电网阻抗（Z）的绝对值的变化率与各自预定的 极限值。 该方法还包括基于比较来检测电网故障状态，其中在孤岛状态（AID）和故障穿越（FRT）情况之间划分出区别，并且发信号通知现有的孤岛状况（AID）或故障穿过 （FRT）情况作为电网故障状态。 本公开另外涉及被配置为执行该方法的逆变器。

公开(公告)号：US20130182477A1

公开(公告)日：2013-07-18

申请号：US13772660

申请日：2013-02-21

Applicant: SMA Solar Technology AG

Inventor： Karel De Brabandere ,  Vitali Sakschewski ,  Lars Cramer ,  Yehia Tarek Fawzy ,  Stijn Stevens ,  Daniel Premm

IPC: H02M7/44

CPC classification number: H02M7/44 ,  H02J3/383 ,  Y02E10/563

Abstract: A method for grid support by means of an inverter is disclosed, wherein the grid is supported by feeding in compensation currents. The method includes measuring a prevailing grid state, and breaking down voltages measured for measuring the prevailing grid state into symmetrical components of the grid state including positive sequence system components and negative sequence system components. The method further includes determining symmetrical components of a compensation current including positive sequence system components and negative sequence system components of the compensation current as functions of deviations of the positive sequence system components and negative sequence system components of the grid state from reference values, and feeding-in a compensation current as the vector sum of the determined symmetrical components of the compensation current

Abstract translation: 公开了一种通过逆变器进行电网支持的方法，其中通过馈送补偿电流来支持电网。 该方法包括测量主要的电网状态，以及将测量的主要电网状态的电压分解成电网状态的对称分量，包括正序系统分量和负序系统分量。 该方法还包括确定补偿电流的对称分量，其包括补偿电流的正序列系统分量和负序系统分量，作为电网状态的正序列系统分量和负序系统分量与参考值的偏差的函数，以及馈送 - 在补偿电流中作为确定的对称分量的补偿电流的矢量和

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：US10024928B2

公开(公告)日：2018-07-17

申请号：US15138412

申请日：2016-04-26

Applicant: SMA Solar Technology AG

Inventor： Stijn Stevens ,  Vitali Sakschewski

IPC: G01R31/40 ,  H02M1/32 ,  H02M7/48 ,  H02S50/10 ,  H02J3/38

CPC classification number: G01R31/40 ,  H02J3/383 ,  H02J3/386 ,  H02J3/387 ,  H02J2003/388 ,  H02M1/32 ,  H02M7/48 ,  Y02E10/563 ,  Y02E10/763

Abstract: The disclosure relates to a detection method for an inverter for detecting a grid fault in a power supply grid, includes determining a grid impedance (Z) and/or the rate of change thereof with respect to time (dZ/dt) and/or a rate of change of an absolute value of the grid impedance (Z) with respect to time (d|Z|/dt), comparing the absolute value and/or a real part and/or an imaginary part of the grid impedance (Z) and/or the rate of change thereof with respect to time (dZ/dt) and/or the rate of change of the absolute value of the grid impedance (Z) with respect to time (d|Z|/dt) with respective predetermined limit values. The method also includes detecting a grid fault state based on the comparison, wherein a distinction is drawn between an islanding situation (AID) and a fault ride through (FRT) situation, and signaling an existing islanding situation (AID) or a fault ride through (FRT) situation as a grid fault state. The disclosure additionally relates to an inverter that is arranged to perform the method.