Reactive Power Injection Strategies For Wind Energy Regarding Its Statistical Nature (original) (raw)
This work studies reactive power strategies for wind turbines and wind farms. Previous Spanish regulation stated unity power factor (P.F.) as target. New regulation introduced in RD 436/2004 rewarded up to 8% with P.F. < 0,95 inductive (on low-load hours) and P.F. < 0,95 capacitive (on peak hours). A better utilization of the infrastructure can be attained considering the reactive power generation availability even in calm periods -depending on the reactive power compensation scheme implemented in the wind farm-. This can lead to a voltage support strategy in a nearby node, especially if the voltage at that node can be estimated despite tap changing transformers. The effect of some control strategies in nearby nodes are quantified statistically regarding the stochastic nature of wind power.
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2015
The Portuguese national grid code [1] specifies minimum technical requirements for fault ride through capacity and reactive power injection during faults which are applicable to all wind farms above 6MVA. However, it was established that the wind generators, even the most recent ones, can only inject symmetrical reactive power even in the presence of an asymmetrical fault. This could potentially lead to high overvoltages in the MV network (low impedance grounded) or in the HV network (solidly grounded only at the TSO substation). To evaluate the consequences to the Portuguese Distribution Grid of the symmetrical reactive power injection by the wind generators, EDP Distribuicao requested LABELEC’s collaboration. Two cases were considered: the connection of the wind farm (WF) to the HV network; and to the MV network. For each of these, different scenarios were simulated. This study gave a conclusive answer to EDP Distribuicao since it allowed to answer its doubts.
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