The Research on Improving the EMC of Direct-drive Wind Power System Based on Randomized Modulation Technology

The excessive Electro Magnetic Interference of the inverter will disturb other equipments in the direct-drive permanent magnet wind power system.In order to solve this problem,a new control strategy is presented in this paper,and the randomized modulation technology of the inverter is applied on the system and experimented on inverter based on ATmega128 AVR MCU.The experiment proves that randomized modulation technology can reduce the EMI caused by power switching circuits.The whole system of electromagnetic compatibility has been obviously improved,which does not increase the hardware cost of the inverter.