我是电力电子方向的研究生，想搞理论为主的论文，有什么好的方向吗？

Abstract: With the development of power electronics technology, harmonic hazards has become increasingly serious, harmonic governance issues has been imminent. On the power source for electronic devices harmonic analysis and concluded that its harm and the corresponding harmonic management principles and comprehensive management, and management of a harmonic outlook.
Key words: power electronics; harmonics; hazards; inhibition
INTRODUCTION
With the development of power electronics technology, power electronic devices to the extensive application of power system harmonics caused serious pollution. Various power electronic equipment in the transport, metallurgical, chemical and other industrial traffic the extensive application of harmonics in the grid problem is becoming increasingly serious, many low power factor of power electronic devices to the power grid additional burden on the quality of power and influence, Therefore, the power electronic devices harmonic po