Reactive power requirements

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The present Spanish Grid Code (O.P. 12.3) prescribes that reactive power consumptions are not allowed in the wind farm installations at the point of common coupling with the grid during the voltage dip and the following clearance fault and voltage recovery. However, some reactive power consumptions lower than 60% of the registered rated power in each cycle (20 ms) may be allowed during just the 150 ms after the beginning of three-phase balanced voltage dips and the 150 ms after its clearance (fig.3a). These admitted periods of reactive power consumptions will be reduced in the future Spanish Grid Code (O.P. 12.2) to 40 ms after the beginning of the fault and 80 ms after the voltage recovery and clearance fault (fig.4a).

For unbalanced single-phase and two-phase voltage dips (fig.3b), some unspecified reactive power consumptions are allowed during the 150 ms after the beginning of the fault (80 ms according to the O.P. 12.2, fig.4b) and the 150 ms after the voltage recovery (80 ms according to the O.P. 12.2, fig.4b). But, some reactive power consumptions lower than 40% of the registered rated powers are admitted during all disturbance duration for periods lower than 100 ms. Reactive power for unbalanced faults is defined by the present Spanish Grid Code like the sum of the reactive powers supplied to each grid phases, i.e., such as it is expressed by (20). E.ON German Grid Code establishes grid voltages must be supported during the transient voltage dips by supplying the necessary reactive power, with a limit of the wind farm registered rated power.

Fig. 3. Reactive power requirements according to the O.P. 12.3: (a) Balanced voltage dips; (b) unbalanced voltage dips
Fig. 4. Reactive power requirements according to the O.P. 12.2: (a) Balanced voltage dips; (b) unbalanced voltage dips

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