WPs consist of a large variety of interconnected components including mechanical parts, power electronic devices, control and protection systems, etc. Accurate and generic models for different types of WTs are crucial for reliable design and planning of modern power systems that incorporate WPs. This chapter introduces an effective approach towards detailed modeling and simulation of WPs that employ variable speed WTs. Specifically, converters and their control schemes for DFIG and FSC WTs are thoroughly discussed, and their main parameters are explained. Moreover, software implementation, average value and detailed models, and controller design are addressed. EMTP® is used to verify the accuracy of the generic models under different test cases. Time-domain simulation results are analyzed and compared with the real-life measurements of post-fault transients in the test scenarios. The results confirm that the developed models in conjunction with the EMT simulations can accurately predict the response of DFIG and FSC WTs under both steady-state and transient conditions.