Variable pulse frequency pulse controlled (pwr) inverter, wind power installation, arrangement of a plurality of wind power installations, and parallel connection of a plurality of pulse controlled inverters

摘要

"VARIABLE PULSE CONTROLLED (PWR) INVERTER, WIND POWER INSTALLATION, PLANALITY OF WIND POWER INSTALLATIONS AND, PARALLEL CONNECTION OF A PULSE CONTROLLED INVERTER." In the case of wind power installations it is known to equip them with a synchronous generator and to provide, for variable speed operation, a direct current intermediate circuit as well as a post-connected pulse controlled inverter as a converter. Frequency Accordingly, it is an object of the invention to provide a pulse-controlled inverter for a wind power installation which avoids the aforementioned disadvantages and overall reduces power loss with a minimum of harmonic content. This is achieved according to the invention with a pulse-controlled inverter having the characteristics according to claim 1. An advantageous development is described in claim 2. In claim 3 there is described an inverter-controlled wind power installation A pulse pulse according to either of claims 1 or 2. An arrangement of several wind power installations according to claim 3, connected in parallel to one another, is described in claim 4. The invention is based on the knowledge of completely moving away from a pulse-controlled inverter with a switching frequency or static pulse duration, as is known from the prior art and FIG. 2, and conforming the switching frequency, and more precisely, depending on the alternating current to be produced. In the zero-pass region of the alternating current produced, the switching frequency is in this case maximum, ie the pulse duration is minimum, in the region of the maximum alternating current amplitudes, the switching frequency is minimum, ie that is, the pulse duration is maximum.