公开(公告)号：US20140103885A1

公开(公告)日：2014-04-17

申请号：US14055314

申请日：2013-10-16

Applicant: ABB Oy

Inventor： Tuomas PULLI ,  Janne HELLBERG

IPC: G05F5/00

CPC classification number: G05F5/00 ,  G05F1/67 ,  H02J3/385 ,  Y02E10/58

Abstract: A method and an arrangement of tracking a selected (e.g., maximum) power point of a photovoltaic system is disclosed, in which method an operation point of the photovoltaic system is changed based on the change of operation point and a change of power generated by the photovoltaic system. The method can include repeatedly determining a current or voltage of the photovoltaic system, determining a power of the photovoltaic system, determining a change of power of the photovoltaic system with respect to a previous determined power, and changing the operation point of the photovoltaic system by changing a current or voltage reference of the system stepwise depending on the change of power and a direction of a previous change of the current or voltage reference.

Abstract translation: 公开了一种跟踪光伏系统的选定（例如，最大）功率点的方法和装置，其中光伏系统的操作点基于操作点的改变和由此产生的功率的变化而改变 光伏系统。 该方法可以包括重复地确定光伏系统的电流或电压，确定光伏系统的功率，确定光伏系统相对于先前确定的功率的功率变化，以及通过以下方式改变光伏系统的工作点 根据功率的变化和电流或电压基准的先前变化的方向逐步改变系统的电流或电压基准。

公开(公告)号：US20140098449A1

公开(公告)日：2014-04-10

申请号：US14049751

申请日：2013-10-09

Applicant: ABB Oy

Inventor： Janne HELLBERG ,  Kimmo Heinonen ,  Jari Uusimäki

IPC: G01R31/28

CPC classification number: G01R31/28 ,  H02J3/381 ,  H02J2003/388

Abstract: A method and an arrangement are disclosed for detecting islanding operation of a distributed power generator. The method can include determining a frequency of a grid to which the distributed power generator is connected, measuring a rate of change of the frequency of the grid at an output of the distributed power generator, determining a threshold value for an alteration speed, comparing the rate of change of the frequency of the grid with the threshold value, and detecting islanding operation when the measured rate of change of the frequency exceeds the threshold value for a certain time period.

Abstract translation: 公开了一种用于检测分布式发电机的孤岛运行的方法和装置。 该方法可以包括确定分布式发电机连接到的电网的频率，测量在分布式发电机的输出处的电网频率的变化率，确定改变速度的阈值， 电网频率随阈值变化的速率，以及当所测量的频率变化率超过阈值一定时间段时检测孤岛作业。