transient studies hvdc wind park transmission system switching transients ac grid mmc resonances harmonics overcurrent overvoltage capacitor voltage transformers (cvts) inductive voltage transformers (ivts) power transformers ferroresonance variable shunt reactor sf6 circuit breaker controlled switching electric arc model overvoltages inrush current circuit breaker vsr reactor shunt reactor 420kv threephase interconnection researches vsc-hvdc vdc control offshore hvdc platform offshore windfarm frequency stability voltage stability control schaufenster projects oscillation stability control interconnection vsc-hvdc connected owf frequency control vsc-hvdc structure and controller vsc-hvdc interconnector frequency control wtg synchronous generator transmission system protection unbalanced fault renewable energy reactive power compensation modeling telecommunication cables pipelines electric railway system power quality engineering
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