Active power filter device and three-loop control method based on three-loop control

Abstract

The invention discloses an active electric power filtering apparatus based on three-loop control. The apparatus comprises system power sources, flat wave reactors, a three-phase full-bridge inversion unit, and capacitors and equalizing resistors which are connected with the three-phase full-bridge inversion unit. A voltage transformer is connected between the system power sources and the flat wave reactors, an output end of the voltage transformer is connected with a system sampling port of a main control board, an output current transformer is arranged between the flat wave reactors and the three-phase full-bridge inversion unit in a penetrating manner, the output current transformer is connected with an output sampling port of the main control board, each group of the capacitors at the DC side of the three-phase full-bridge inversion unit are connected with a DC voltage transformer, the DC voltage transformer is connected with a DC side sampling port of the main control board, and an insulated gate bipolar transistor (IGBT) driving signal port of the main control board is connected with an IGBT driving circuit, a load side is connected with a load current transformer in a penetrating manner, and a secondary output end is connected with a load current sampling port of the main control board. The apparatus and method provided by the invention have the advantages of high output voltage control precision, good compensation effect and high system reliability.

Description

technical field [0001] The invention relates to an active power filter device based on three-loop control, in particular to an active power filter device based on three-loop control and a three-loop control method based on a voltage outer loop, a current inner loop and a stability correction loop. Background technique [0002] With the development of power electronics technology, the use of various nonlinear and impact equipment has brought a lot of harmonic pollution to the power grid, resulting in a series of low power factor, serious harmonic pollution, and increased system loss. question. With the deterioration of power quality, the quality of power supply power needs to be governed and improved. Generally speaking, power quality refers to the quality of power supply and power consumption, including the deviation of voltage and current steady state and transient value, the degree of waveform distortion, flicker and other power supply and power consumption problems that ...

AI Technical Summary

Problems solved by technology

The operation status and compensation effect of APF depend on the control algorithm of APF itself. With the extensive use of active power filter devices, the traditional PI control has its defects. The effect is poor, and the output phase lags behind, so that the power quality control effect cannot achieve the expected purpose. The active power filter device based on the three-loop control theory adopts predictive repetitive control, and has good tracking characteristics for the compensation output. Compensation good effect

Images