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This study is performed in order to explore the advantages and disadvantages of combining wind turbines at DC bus and AC bus. The research model that is designed by using MATLAB/Simulink software consists of five permanent magnetic synchronous generator (PMSG) wind turbines connected in parallel. Each wind turbine has the capacity of 200 W. When the wind speed is 12 m/s, the simulation results show that total active power of the wind turbines connected at DC bus (PT = 787 W) is higher than that connected at AC bus (PT = 720 W). In addition, when the wind speed is variable, the average efficiency of each turbine at DC bus (99.54%) is better than that connected at AC bus (97.64%). It can be seen that the total output power of wind turbines connected at AC bus is not maximum power because the frequencies of AC voltage generated by wind turbines depend on the wind speed, while the total output power of wind turbines connected at DC bus is not affected when wind turbine operates at different wind speeds. Thus, the connection of wind turbines at AC bus is ineffective.

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