公开(公告)号：EP1314233A1

公开(公告)日：2003-05-28

申请号：EP01964086.1

申请日：2001-08-17

Applicant: ABB Inc.

Inventor： JUNGREIS, Aaron, M. ,  BAPAT, Vinod

IPC: H02J1/10 ,  H02J1/12 ,  H02J7/00 ,  H01M8/00 ,  H01M8/04

CPC classification number: H02J1/10 ,  H01M16/003 ,  H02J7/34 ,  Y10T307/344 ,  Y10T307/516 ,  Y10T307/625

Abstract: A high efficiency power conditioner interfaces a load to a fuel cell (10) that produces a low voltage that varies with the load. A dc-to-ac inverter (16) operates with a low voltage input provided by a dc bus (14). When a positive step load change occurs, a low voltage battery (22) provides power equal to the step change until the fuel cell (10) is able to provide enough power to support the entire load. The power from the battery (22) is supplied to the varying dc bus (14) through a boost converter (12). This boost converter allows full control of the battery power, so that the power drawn from the fuel cell can be gradually increased as the ability of the fuel cell to provide the full required load power is gradually increased. When very large positive load step changes occur, the battery can feed power to the dc bus through diode D1, rather than through the boost converter.

公开(公告)号：EP1266090A1

公开(公告)日：2002-12-18

申请号：EP01914808.9

申请日：2001-03-14

Applicant: ABB Inc.

Inventor： CHEN, Shih-Chin ,  MURPHY, Timothy, F.

IPC: D21G9/00

CPC classification number: D21G9/0027

Abstract: Headbox transient response for sheet weight and moisture are modeled as a combination of two sets of time constants and dead time delays. One set represents a shorter delay with faster response dynamics, the fast mode weight and moisture responses, and the other models the longer delay with slower dynamics, the slow mode weight and moisture responses. A weight and/or moisture transient model is then formed for headbox changes by combining the fast mode weight and moisture responses and the slow mode weight and moisture responses. Stock weight and moisture dynamic and delay time models are determined for operation of stock flow of the paper making machine and the stock flow is controlled in accordance with the stock weight and/or moisture models and the headbox weight transient and/or moisture transient model to compensate for weight and moisture changes in a web of paper being manufacture which weight and moisture changes result from headbox changes.