Modularized multi-machine parallel-connection large-power APF (active power filter) control system and realization method

Abstract

The invention discloses a modularized multi-machine parallel-connection large-power APF (active power filter) control system and a realization method. By coordinating an upper layer controller and a lower layer controller, an effect for reasonably allocating the compensative capacity and improving the compensation precision can be realized; the upper layer controller is used for carrying out the coordination and switching control on each power module, for example, the upper layer controller is used for operating and monitoring the quantity of the power modules to be put into use according to a load requirement, numbering the power modules according to a rule and eliminating the switching subharmonic by utilizing the carrier phase shifting; the lower layer controller is used for receiving a compensation order of the upper layer controller and a synchronous signal of a previous sequence number controller and feeding back state information of the power module to the upper layer controller. By adopting the modularized multi-machine parallel-connection large-power APF control system, the compensation capacity of the power module and the computation of an upper layer and a lower layer of the control system are reasonably allocated, the entire system can be enabled to run stably and orderly, the stopping of the entire system caused by the malfunction of one power module can be avoided, and the feasibility and practical value are good.

Description

technical field [0001] The invention relates to a modular multi-machine parallel high-power APF control system and a realization method, belonging to the power electronics application technology. Background technique [0002] Since the 1920s and 1930s, the mercury arc rectifier used by the Germans produced obvious voltage and current distortion in the power grid, and the harmonic problem has been paid attention to by people. Harmonics come from electrical equipment with nonlinear characteristics, and a small part is generated by transformers and reactors in the power grid. There are mainly five types: ① power electronic devices, ② electrified railways, ③ industrial arc devices, ④ distribution network transformers, reactors, and ⑤ electricity for residential buildings. [0003] Due to the shortcomings of traditional passive filters, coupled with the development of power electronics technology, control theory and digital signal processing technology, the theory of active powe...

AI Technical Summary

Problems solved by technology

When one fails, it will affect the operation of the whole system; when the load harmonic changes greatly, it is not easy to expand and maintain

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