In this article, power flow transfer entropy (PFTE) is proposed as a criterion to evaluate the power flow transfer characteristics of the multiterminal HVdc (MTdc) wind power integration grid. This proposed criterion can detect and locate the ac three-phase to ground (TPG) faults in the MTdc grid by its sensitivity to power flow change to avoid communication. The transient energy dissipation control strategy is then designed according to the variety of PFTE, which reflects the power flow reversal characteristic of the MTdc grid during ac faults. Experimental results show that the system based on the proposed communication-free method can ride through ac TPG faults without blocking any converter.