Single-phase and three-phase dual buck full-bridge parallel active power filter

Abstract

The invention provides a single-phase and three-phase dual buck full-bridge parallel active power filter, belonging to the technical field of electric power harmonic suppression. The single-phase and three-phase dual buck full-bridge parallel active power filter comprises two structures suitable for a single-phase power grid system and a three-phase four-wire system grid system. The invention comprises a bridge arm, an AC side parallel dual inductance and a DC side capacitance, wherein the bridge arm is composed of a single power tube and a diode. The invention has simple circuit structure, is easy to realize control and driving and has excellent filter performance. Because of the special structure of the bridge arm of the single-power tube, the invention can avoid the direct connection problem of the bridge arm and improves the working reliability of an active filter. The invention can be widely used for the harmonic wave treatment of a power grid with high requirement on system reliability and large volume, such as aviation, aerospace, medical establishment, high-precision instrument manufacture and the like.

Description

Technical field: [0001] The invention relates to a single-phase, three-phase double step-down full-bridge parallel active power filter, which is suitable for various medium and high-power power consumption systems requiring high reliability, and belongs to the technical field of power harmonic suppression. Background technique: [0002] In the power distribution system and distribution network, the use of a large number of nonlinear loads causes problems such as voltage flicker, fluctuation, frequency drift, three-phase unbalance, harmonics, etc. that affect power quality and efficiency, especially with switching power supplies and The extensive use of various power electronic devices represented by AC speed control equipment will cause disturbance to other users and threaten the safe operation of the power grid and electrical equipment, making reactive power and harmonic compensation in the power system an urgent problem to be solved. [0003] Many experts and scholars have...

AI Technical Summary

Problems solved by technology

Among the various types of active power filters, parallel active power filters are dominant. So far, parallel active power filters have developed a variety of topological methods, and the basic components mainly use double switch tubes in series. The half-bridge or full-bridge structure, the switch tube may cause the bridge arm through problem when the high-frequency switching operation, affecting the stability and reliability of the system, and increasing the dead zone of the switch will also affect the filtering characteristics of the active power filter. It is difficult to be widely used in power grid systems with high reliability requirements

At the same time, for the active filter with a half-bridge structure, the utilization rate of the capacitor voltage on the DC side is only half of that of the active filter with a full-bridge structure, which has a great impact on the compensation characteristics of the active power filter

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