| 摘要 |
The proposed method of controlling a wind power station by the change in the value of a connected impedance load is characterized in that based on knowledge of load characteristics, based on knowledge of an excitation characteristic and based on knowledge of values of available impedance loads, there are determined available switching levels, which are further compared with an indication regarding the level of output voltage of an electric generator. Subsequently, based on this comparison, a command is issued for connection or disconnection of at least one of the available impedance loads with the aim to achieve maximum efficiency of the electric generator (1). The circuit arrangement for controlling a wind power station comprising an electric generator (1) having its output (11) to at least one impedance load (21, 22, 23) via a switching unit (3), which has its second input (32) connected with an output (43) of a voltage level comparator (4). The first input (41) of the voltage level comparator (4) is connected to the electric generator (1) output (11) and the second input (42) of the voltage level comparator (4) is connected to the output (54) of a block (5) for switching level determination. Preferably, a voltage converter (6) is connected between the electric generator (1) output (11) and the first input (41) of the voltage level comparator (4). The voltage level comparator (4) is provided with at least third input (44) for providing information regarding the value of an actually connected impedance load and a possibility of dividing thereof, wherein said comparator third input (44) is connected to the switching unit (3). The switching level determination block (5) is further provided with inputs (531, 532, 533) for delivery of information regarding the value of each of the impedance loads (21, 22, 23), which are connected to at least one impedance load (21, 22, 23). The switching level determination block (5) is further provided with an input (51) for delivery of information regarding load characteristic of the electric generator (1), which is connected via an optimum load line computation unit (8) to a device (7) for measuring the electric generator (1) load characteristic or the optimum load line thereof, wherein said device (7) is connected via a first switch (71) to the electric generator (1) output (11). Said switching level determination block (5) is further provided with an input (52) for the delivery of information regarding the excitation characteristic of the electric generator (1), which is connected to a unit (9) for evaluation of the electric generator (1) excitation characteristic, which unit (9) is connected via a second switch (91) to the electric generator (1) output (11). |
