Invention Grant
- Patent Title: Method for smoothing alternating electric current from a number of power generating units and wind power plant including a number of wind mills with variable rotational speed
- Patent Title (中): 用于平滑来自多个发电单元的交流电流的方法和包括多个具有可变转速的风车的风力发电厂
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Application No.: US13154635Application Date: 2011-06-07
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Publication No.: US08330431B2Publication Date: 2012-12-11
- Inventor: Henrik Stiesdal
- Applicant: Henrik Stiesdal
- Applicant Address: DE München
- Assignee: Siemens Aktiengesellschaft
- Current Assignee: Siemens Aktiengesellschaft
- Current Assignee Address: DE München
- Priority: EP06002276 20060203
- Main IPC: H02P11/00
- IPC: H02P11/00 ; H02P9/00 ; H02H7/06 ; F03D9/00 ; H02P9/04 ; F03B13/00
Abstract:
A method and a wind power plant are provided for smoothing alternating electric current from a number of power generators are provided. Generators are electrically connected to an electric network. Each power generator includes a transformer with pulse width modulation for converting direct current to pulse width modulated alternating current for feeding to the network. The time for feeding the pulses of the pulse width modulated alternating current is different for each generator in order to achieve a more even alternating current as a sum of respective outputs of alternating current from the generators.
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