| 摘要 |
Wind power plants are generally fitted with a synchronous generator and a d.c. link for variable speed operation of the synchronous generator as well as a downstream pulse-controlled inverter working as a frequency converter. The current system has the aim of providing a pulse-controlled inverter for a wind power plant that avoids the above-mentioned disadvantages and generally reduces power losses with minimum harmonic oscillations. According to the methodologies disclosed, this is achieved by a pulse-controlled inverter having the features cited in Claim 1. An advantageous configuration is described in Claim 2. Claim 3 describes a wind power plant with a pulse- controlled inverter such as the one cited in Claim 1 or 2. An array of several parallel-connected wind power plants according to Claim 3 is described in Claim 4. The system seeks to produce a pulse-controlled inverter with variable operating frequency depending on the alternating current to be generated which differs completely from the pulse-controlled inverter with a static operating frequency or cycle time known in prior art and illustrated in Figure 2. In the zero crossing range of the generated alternating current, operating frequency is maximal while cycle time is minimal. In the maximum amplitude of the alternating current, operating frequency is minimal while cycle time is maximal.
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