Wind power
Wind turbine steady state: P-Q envelope, reactive headroom and the simplified LVRT/ride-through check at the point of connection.
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Active power, reactive capability limits, headroom and the ride-through/reactive-support verdict.
About Wind turbine steady state
One study drives this page: study.windTurbine (P2-15), the steady-state electrical model of a doubly-fed or full-converter wind turbine. It reports the active and reactive power capability envelope - the apparent-power circle P2 + Q2 <= Sn2 giving qCapMax, qIndMax and pfMin = |P|/Sn - and a simplified low-voltage ride-through check that reuses the GB/T 19964 segmented profile (0 pu for 0.15 s, 20 % for 0.625 s, linear to 0.9 pu for 2.0 s) with the dynamic reactive-current demand dIq >= k x (0.9 - U) and the converter current limit. The standard basis is IEC 61400-21-1:2019 (measurement and assessment of the electrical characteristics of a wind turbine) and IEC 61400-27-1:2020 (generic electrical simulation models, Type 3 DFIG and Type 4 full-converter classification); the ride-through curve comes from the PV module and follows GB/T 19964. Aerodynamics, mechanics and converter control dynamics are explicitly out of scope.
Wind is judged by the grid code rather than by the load flow: the utility asks whether the turbine can supply reactive power at its operating point and whether it stays connected through a voltage sag. Both answers are capability questions, and answering them from the same circle and the same ride-through curve keeps the wind result consistent with the PV result next to it.
Input = the wind device in the scheme (apparent power, active output, converter data) plus studyOptions.enableWindTurbine. Chain: the PQ envelope reuses the same circle function as the PV study, so Q_max = +/- sqrt(Sn2 - P2), pfMin = |P|/Sn and the feasibility flag come from one implementation; the ride-through check reuses the GB/T 19964 profile and the reactive-current demand from the PV LVRT module, then compares the required reactive current with the current the converter can deliver and reports the verdict with its reason. Output = study.windTurbine (device tag, Sn, P, reactive capability in both directions, pfMin, ride-through status, feasibility reason). If no machine data is supplied the envelope stays empty and is labelled as such - a capacity is never guessed. Linkage: the same turbine capacity changes the load-flow injection (bus voltage, losses), the short-circuit contribution and the hosting capacity on the island page, and the energy behind the economics page.
Engine switch studyOptions.enableWindTurbine. When the machine type is not given the envelope stays empty and the page says so — it does not guess a capacity.