公开(公告)号：WO2011097147A3

公开(公告)日：2012-04-26

申请号：PCT/US2011023100

申请日：2011-01-31

Applicant: XANTREX TECHNOLOGY INC ,  YIN JUN ,  FAN CHI-SHENG ,  GARABANDIC DJORDJE

Inventor： YIN JUN ,  FAN CHI-SHENG ,  GARABANDIC DJORDJE

IPC: H02J3/38

CPC classification number: H02J3/383 ,  H02J2003/388 ,  Y02E10/563 ,  Y10T307/522 ,  Y10T307/729

Abstract: An anti-islanding implementation that introduces a small, continuously varying phase shift pattern in the output current of an inverter. In grid-connected mode, this phase shift pattern has no impact on the frequency of the inverter's output voltage. However, when islanded, the phase shift will cause the voltage frequency to deviate from nominal. Changes in the output current phase thus correlate well with the voltage frequency, so a covariance index is used to detect an islanding configuration. When this index exceeds a threshold, a larger phase shift pattern is introduced in the output current, large enough to cause the voltage frequency to fall outside the inverter's trip protection window without compromising the inverter's power quality yet ensuring reliable tripping of the inverter.

Abstract translation: 一种反孤岛实现，在逆变器的输出电流中引入小的，连续变化的相移模式。 在并网模式下，该相移模式对变频器输出电压的频率没有影响。 然而，当孤岛时，相移将导致电压频率偏离标称值。 因此，输出电流相位的变化与电压频率相关，因此协方差指数用于检测孤岛状态。 当该指标超过阈值时，在输出电流中引入较大的相移模式，足够大以使电压频率落在变频器跳闸保护窗外，而不会影响变频器的电源质量，同时确保变频器的可靠跳闸。

公开(公告)号：WO2012166788A2

公开(公告)日：2012-12-06

申请号：PCT/US2012039978

申请日：2012-05-30

Applicant: XANTREX TECHNOLOGY INC ,  GARABANDIC DJORDJE

Inventor： GARABANDIC DJORDJE

IPC: H02J3/36 ,  H02J5/00

CPC classification number: H02J3/383 ,  H02J3/46 ,  H02S40/32 ,  H02S40/34 ,  H02S50/00 ,  Y02E10/563 ,  Y10T307/724

Abstract: A photovoltaic system includes: a photovoltaic generator comprising strings that each includes one or more photovoltaic cells; a power converter; switches; and a controller. The power converter is configured to convert direct current (DC) power provided by the photovoltaic generator into alternating current (AC) power, and to output the AC power. Each switch is associated with one of the strings and is configured to connect the associated string to the power converter when set to a first setting, such that power generated by the first string can flow to the power converter. Each switch is also configured to disconnect the string from the power converter when set to a second setting. The controller is configured to control the power provided by the photovoltaic generator by selectively connecting the strings of the photovoltaic generator to the power converter by controlling the settings of the switches.

Abstract translation: 光伏系统包括：光伏发电机，其包括每个包括一个或多个光伏电池的串; 电源转换器; 开关; 和控制器。 功率转换器被配置为将由光伏发电机提供的直流（DC）功率转换为交流（AC）功率并输出AC电力。 每个开关与一个串相关联，并且被配置为当设置为第一设置时将相关联的串连接到功率转换器，使得由第一串产生的功率可以流到功率转换器。 每个开关也被配置为在设置为第二个设置时将串与电源转换器断开。 控制器被配置为通过控制开关的设置来选择性地将光伏发电机的串连接到功率转换器来控制由光伏发电机提供的功率。