An AC signal acquisition board for a flexible AC power transmission device

Abstract

The invention provides an alternating-current signal acquisition board for a flexible alternating-current transmission device. The alternating-current signal acquisition board comprises a signal acquisition module, an AD (analog to digital) conversion module, a CPLD (complex programmable logic device) module, an EtherCAT (Ethernet for control automation technology) slave station module and an input-output module, the CPLD module is connected with and controls the AD conversion module and the EtherCAT slave station module, the signal acquisition module acquires voltage and current of a main circuit of the flexible alternating-current transmission device and converts the voltage and the current into alternating-current analog signals, the AD conversion module converts low-voltage analog signals into digital signals, and the CPLD module reads the digital signals generated by conversion of the AD conversion module. One end of the EtherCAT slave station module is connected with the CPLD module while the other end thereof is connected with an EtherCAT bus outside the alternating-current signal acquisition board to transmit the digital signals sent by the CPLD module to the EtherCAT bus. The alternating-current signal acquisition board for the flexible alternating-current transmission device adopts an independent AD conversion chip, and can sample alternating-current signals by 16-bit high precision, and influences of common-mode interference on sampled signals are reduced by adopting a differential input mode.

Description

technical field [0001] The invention relates to the technical field of power electronic device control and protection, in particular to an AC signal acquisition board for a flexible AC power transmission device. Background technique [0002] Power electronic devices are devices composed of various power electronic circuits, which are used for the conversion and control of high-power electric energy. Flexible AC transmission technology is one of the core technologies. Dynamic voltage restorers (dynamic voltage restorers, DVR), static synchronous compensator (Static Synchronous Compensator, STATCOM), static synchronous series compensator (Static synchronous series compensator, SSSC), unified power flow controller (Unified power flow controller, UPFC), etc. FACTS) core device. The above-mentioned novel FACTS device is used to improve the controllability and transmission capacity of the AC power transmission system. [0003] The control system of the flexible AC transmission d...

AI Technical Summary

Problems solved by technology

The AD (AnalogDigital, analog-to-digital) converter that comes with the digital signal processor DSP cannot meet the requirements of high-precision sampling, and the number of signal acquisition channels cannot be increased after the circuit topology is determined.

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