公开(公告)号：EP3041110B1

公开(公告)日：2018-08-29

申请号：EP15199425.8

申请日：2015-12-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Pan, Nianan ,  Cheng, Lin ,  Tao, Lei

IPC分类号： H02J3/38 ,  H02S40/32 ,  H02M7/493 ,  H02M1/12

CPC分类号： H02J3/383 ,  H02J3/385 ,  H02M7/44 ,  H02M7/493 ,  H02M2001/123 ,  H02S40/32 ,  Y02E10/563 ,  Y02E10/58

摘要： A control method and apparatus for photovoltaic inverters connected in parallel at an AC side are provided, the method is applied for an inverter system in which inverters are connected in parallel at an AC side and independent from each other at a DC side, where an input terminal of the first inverter is connected with a first PV array, an input terminal of the second inverter is connected with a second PV array, each of the first PV array and the second PV array has a parasitic capacitance to ground, and the first inverter and the second inverter form a common-mode loop by coupling with the parasitic capacitances, where the method includes the following steps: detecting a first direct voltage of the first inverter and a second direct voltage of the second inverter; obtaining a difference between the first direct voltage and the second direct voltage; and adjusting the direct voltages of the inverters to control the difference to be within a predetermined range and control a common-mode voltage in the common-mode loop to be within a predetermined common-mode voltage range. The smaller the difference between direct voltages of the inverters is, the smaller the common-mode voltage difference between the inverters is, and the smaller the common-mode current is, thereby restraining the common-mode circulation current between the inverters.

公开(公告)号：EP3016256A1

公开(公告)日：2016-05-04

申请号：EP15184730.8

申请日：2015-09-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Pan, Nianan ,  Cheng, Lin ,  Tao, Lei

IPC分类号： H02M1/12 ,  H02J3/01 ,  H02J3/38 ,  G01R23/20 ,  H02M1/00

CPC分类号： H02J3/383 ,  G01R23/20 ,  H02J3/01 ,  H02J3/38 ,  H02J3/386 ,  H02J3/387 ,  H02M1/12 ,  H02M2001/0012 ,  Y02E10/563 ,  Y02E10/763 ,  Y02E40/40

摘要： A method and device for monitoring and suppressing a resonance are provided, which are applied to a grid-connected generation system. A current sample voltage of a preset sample point of the grid-connected generation system is monitored in a real time manner; amplitudes of harmonics of the current sample voltage are acquired using a preset algorithm; it is verified whether a resonance occurs in the grid-connected generation system currently based on the acquired amplitudes of the harmonics; in a case that the resonance occurs in the grid-connected generation system, current corrections of parameters of inverters in the grid-connected generation system are acquired according to a preset rule and the parameters of the inverters are adjusted using the current corrections and a selected resonance suppressing algorithm, until the resonance disappears in the grid-connected generation system. It follows that, with the method and device, a resonance point of the grid-connected generation system is adjusted dynamically to suppress the resonance occurred in the grid-connected generation system, thereby ensuring a reliable and stable operation of the grid-connected generation system.

摘要翻译： 提供了用于监视和抑制谐振的方法和装置，其应用于并网发电系统。 以实时方式监视并网发电系统的预设采样点的当前采样电压; 使用预设算法获取当前采样电压的谐波幅度; 当前基于获得的谐波幅度，验证并网是否发生在并网发电系统中; 在并网发电系统中发生共振的情况下，根据预先设定的规则获取并网发电系统中的逆变器的参数的电流校正，并且使用电流校正来调整逆变器的参数，并且选择 谐振抑制算法，直到并网在并网发电系统中消失。 因此，通过该方法和装置，动态调整并网发电系统的谐振点，以抑制并网发电系统中发生的谐振，从而确保并网发电系统的可靠稳定运行 。

公开(公告)号：EP3035509A2

公开(公告)日：2016-06-22

申请号：EP15193952.7

申请日：2015-11-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Ding, Jie ,  Zou, Haiyan ,  Tao, Lei ,  Xu, Taotao ,  Zhang, Cheng

IPC分类号： H02M1/00

CPC分类号： H02M7/483 ,  H02M1/32 ,  H02M3/00 ,  H02M7/487 ,  H02M2001/327 ,  Y02E10/56

摘要： A method for switching an operation mode of a five-level inverter and a device for switching an operation mode of a five-level inverter are provided. The method includes: determining a first three-level operation mode as a three-level operation mode of the five-level inverter to be switched to from a five-level operation mode in a case that a PV input voltage is higher than a bridge line-line voltage command value of the five-level inverter required when the five-level inverter is connected to a power grid; switching, after the operation mode of the five-level inverter is switched to the first three-level operation mode, the operation mode of the five-level inverter from the first three-level operation mode to a second three-level operation mode, in a case that a junction temperature of a switching device operating in the first three-level operation mode exceeds a first preset value; and switching the operation mode of the five-level inverter from the second three-level operation mode to the first three-level operation mode in a case that the junction temperature of a switching device operating in the second three-level operation mode exceeds a second preset value. According to the provided method, the junction temperature of a switching device still operating after the operation mode of the five-level inverter is switched from the five-level operation mode to the three-level operation mode is reduced.

摘要翻译： 提供一种用于切换五电平逆变器的操作模式的方法和用于切换五电平逆变器的操作模式的装置。 该方法包括：在PV输入电压高于桥接线路的情况下，确定作为从五电平操作模式切换到的五电平逆变器的三电平运行模式的第一三电平运行模式 五电平逆变器连接到电网时要求的五电平逆变器的线路电压指令值; 在五电平逆变器的操作模式切换到第一三电平操作模式之后，将五电平逆变器的操作模式从第一三电平操作模式切换到第二三电平操作模式，在 在第一三电平操作模式下工作的开关装置的结温超过第一预设值的情况; 在第二三电平运行模式下工作的开关装置的结温超过第二三电平运行模式的情况下，将五电平逆变器的动作模式从第二三电平动作模式切换到第一三电平动作模式 预设值。 根据所提供的方法，在五电平逆变器的操作模式之后仍然工作的开关装置的结温从五电平操作模式切换到三电平操作模式减少。

公开(公告)号：EP3035510A3

公开(公告)日：2016-08-03

申请号：EP15193963.4

申请日：2015-11-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Ding, Jie ,  Zou, Haiyan ,  Tao, Lei ,  Xu, Taotao ,  Zhang, Cheng

IPC分类号： H02M1/00 ,  H02M7/487 ,  H02M7/5395 ,  H02M1/12 ,  H02M3/00

CPC分类号： H02M7/42 ,  H02J3/383 ,  H02M1/00 ,  H02M1/12 ,  H02M3/00 ,  H02M7/487 ,  H02M7/5395 ,  Y02E10/56

摘要： A method for modulating a five-level inverter, a device for modulating a five-level inverter, and a photovoltaic system are provided. The method includes: acquiring a voltage command value Vcmd of a phase bridge of the five-level inverter; controlling a first switching device and a fourth switching device to be switched on alternately in a case that Vcmd≥V1Pos+Vthrs1; controlling the first switching device and a third switching device to be switched on alternately in a case that V1Pos-Vthrs2≤Vcmd

摘要翻译： 提供一种用于调制五电平逆变器的方法，用于调制五电平逆变器的装置和光伏系统。 该方法包括：获取五电平逆变器的相桥的电压指令值Vcmd; 在Vcmd‰¥V1Pos + Vthrs1的情况下，控制第一开关装置和第四开关装置交替接通; 在V1Pos-Vthrs2‰Vcmd

公开(公告)号：EP3035509A3

公开(公告)日：2016-08-03

申请号：EP15193952.7

申请日：2015-11-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Ding, Jie ,  Zou, Haiyan ,  Tao, Lei ,  Xu, Taotao ,  Zhang, Cheng

IPC分类号： H02M7/487 ,  H02M3/00 ,  H02M1/32

CPC分类号： H02M7/483 ,  H02M1/32 ,  H02M3/00 ,  H02M7/487 ,  H02M2001/327 ,  Y02E10/56

摘要： A method for switching an operation mode of a five-level inverter and a device for switching an operation mode of a five-level inverter are provided. The method includes: determining a first three-level operation mode as a three-level operation mode of the five-level inverter to be switched to from a five-level operation mode in a case that a PV input voltage is higher than a bridge line-line voltage command value of the five-level inverter required when the five-level inverter is connected to a power grid; switching, after the operation mode of the five-level inverter is switched to the first three-level operation mode, the operation mode of the five-level inverter from the first three-level operation mode to a second three-level operation mode, in a case that a junction temperature of a switching device operating in the first three-level operation mode exceeds a first preset value; and switching the operation mode of the five-level inverter from the second three-level operation mode to the first three-level operation mode in a case that the junction temperature of a switching device operating in the second three-level operation mode exceeds a second preset value. According to the provided method, the junction temperature of a switching device still operating after the operation mode of the five-level inverter is switched from the five-level operation mode to the three-level operation mode is reduced.

摘要翻译： 提供了用于切换五电平逆变器的操作模式的方法和用于切换五电平逆变器的操作模式的装置。 该方法包括：在PV输入电压高于桥接线的情况下，将第一三电平操作模式确定为要从五电平操作模式切换到的五电平逆变器的三电平操作模式 五电平逆变器接入电网时所需的五电平逆变器的在线电压指令值; 在五电平逆变器的操作模式切换到第一三电平操作模式之后，将五电平逆变器的操作模式从第一三电平操作模式切换到第二三电平操作模式， 在第一三级操作模式下操作的开关装置的结温超过第一预设值的情况; 以及在第二三电平操作模式中操作的开关装置的结温超过第二三电平操作模式的结温的情况下，将五电平逆变器的操作模式从第二三电平操作模式切换到第一三电平操作模式 预设值。 根据所提供的方法，在五电平逆变器的操作模式从五电平操作模式切换到三电平操作模式之后，仍然工作的开关器件的结温降低。

公开(公告)号：EP3041110A1

公开(公告)日：2016-07-06

申请号：EP15199425.8

申请日：2015-12-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Pan, Nianan ,  Cheng, Lin ,  Tao, Lei

IPC分类号： H02J3/38 ,  H02S40/32 ,  H02M7/493 ,  H02M1/12

CPC分类号： H02J3/383 ,  H02J3/385 ,  H02M7/44 ,  H02M7/493 ,  H02M2001/123 ,  H02S40/32 ,  Y02E10/563 ,  Y02E10/58

摘要： A control method and apparatus for photovoltaic inverters connected in parallel at an AC side are provided, the method is applied for an inverter system in which inverters are connected in parallel at an AC side and independent from each other at a DC side, where an input terminal of the first inverter is connected with a first PV array, an input terminal of the second inverter is connected with a second PV array, each of the first PV array and the second PV array has a parasitic capacitance to ground, and the first inverter and the second inverter form a common-mode loop by coupling with the parasitic capacitances, where the method includes the following steps: detecting a first direct voltage of the first inverter and a second direct voltage of the second inverter; obtaining a difference between the first direct voltage and the second direct voltage; and adjusting the direct voltages of the inverters to control the difference to be within a predetermined range and control a common-mode voltage in the common-mode loop to be within a predetermined common-mode voltage range. The smaller the difference between direct voltages of the inverters is, the smaller the common-mode voltage difference between the inverters is, and the smaller the common-mode current is, thereby restraining the common-mode circulation current between the inverters.

摘要翻译： 提供了一种用于在AC侧并联连接的光伏逆变器的控制方法和装置，该方法被应用于逆变器系统，其中逆变器在AC侧并联连接并且在DC侧彼此独立，其中输入 第一反相器的端子与第一PV阵列连接，第二反相器的输入端子与第二PV阵列连接，第一PV阵列和第二PV阵列中的每一个具有对地的寄生电容，并且第一反相器 并且第二反相器通过与寄生电容耦合形成共模环路，其中该方法包括以下步骤：检测第一反相器的第一直流电压和第二反相器的第二直流电压; 获得所述第一直流电压和所述第二直流电压之间的差; 并且调整逆变器的直流电压以将差值控制在预定范围内，并将共模环路中的共模电压控制在预定的共模电压范围内。 逆变器的直流电压之间的差越小，逆变器之间的共模电压差越小，共模电流越小，从而抑制逆变器之间的共模循环电流。

公开(公告)号：EP3035510A2

公开(公告)日：2016-06-22

申请号：EP15193963.4

申请日：2015-11-10

申请人： Sungrow Power Supply Co., Ltd.

发明人： Ding, Jie ,  Zou, Haiyan ,  Tao, Lei ,  Xu, Taotao ,  Zhang, Cheng

IPC分类号： H02M1/00

CPC分类号： H02M7/42 ,  H02J3/383 ,  H02M1/00 ,  H02M1/12 ,  H02M3/00 ,  H02M7/487 ,  H02M7/5395 ,  Y02E10/56

摘要： A method for modulating a five-level inverter, a device for modulating a five-level inverter, and a photovoltaic system are provided. The method includes: acquiring a voltage command value Vcmd of a phase bridge of the five-level inverter; controlling a first switching device and a fourth switching device to be switched on alternately in a case that Vcmd≥V1Pos+Vthrs1; controlling the first switching device and a third switching device to be switched on alternately in a case that V1Pos-Vthrs2≤Vcmd

摘要翻译： 提供了一种用于调制五电平逆变器的方法，用于调制五电平逆变器的装置以及光电系统。 该方法包括：获取五电平逆变器的相桥的电压指令值Vcmd; 在Vcmd≥V1Pos+ Vthrs1的情况下，控制第一开关器件和第四开关器件交替导通; 在V1Pos-Vthrs2≤Vcmd