Study On New Methods Of Active Power Harmonic Suppression

The safety problem of transmitting and transforming power is critical for our country's economy developing continuously and steadily, and it is also an important research field in "the fifteenth national five year plan" and "the moderate and long time science and technology development program". Power harmonic pollution is a large threat for power system running steadily, safely and economically, and one of the important factors that affect the safety of transmitting and transforming power. Thus, research on power harmonic suppression becomes the focus around the world. This dissertation studied novel methods of power harmonic active compensation, especially on the converter with double-frequency which is used to improve the compensation capacity and compensation performance of power harmonic suppression, three-phase DC side active power filter on the DC side of uncontrolled rectifier that suppresses the power harmonic, and the concerned one-cycle control method.Firstly, the DC-DC converter with double-frequency was proposed in the point of basic converters in order to solve the contradiction between the capacity and the compensation performance of power harmonic suppression equipment. In the proposed topology, high frequency unit and low frequency unit worked combinatorially, but the functions of which separated relatively. The low frequency unit processed the output power, while the high frequency unit improved the converter performance. Under the nowadays power components development level, this can increase the capacity of the converter, as well as improving the performance, which pave the way to improve the performance of APRThen the dissertation developed the basic DC-DC converter with double-frequency by the converter topology deducing method. From the DC-DC converter with double-frequency in which power flowed in one direction, to the AC-DC and DC-AC converters of single-phase bridge and three-phase bridge structure with double-frequency in which power flowed in two directions, a list of converter with double-frequency is formed.Based on the proposed converter with double-frequency, the dissertation mainly studied the application of the converter with double-frequency in active power filter(APF), power factor correction(PFC) etc. The result indicated that: under the nowadays power components development level, the APF and PFC with...