Analyzing the effect of wake current between wind turbines on flat terrain and complex terrain on wind farm output power. The influence of the collector system components are considering, reliability models of the two-state equivalent wind turbine and the five-state circuit breaker, three-state transformer are established. Using Weibull distribution to simulate the wind speed and the non-sequential Monte Carlo method to simulate the wind speed, the outages of WTs and the collector system components. The model is implemented in MATLAB, and the results show that wake effects and fault of collector system components have a significant influence on the output power of the wind farm, while the reliability model taking those two factors into account has improved the accuracy of the reliability model.