Electric propulsion ship harmonic monitoring system based on FPGA and DSP

Abstract

The invention discloses an electric propulsion ship harmonic monitoring system based on FPGA and DSP. The system comprises a current sensor, a voltage sensor, a signal conditioning circuit, an A / D converter, a DSP chip and an FPGA chip. The current sensor is used for collecting a current signal. The voltage sensor is used for collecting a voltage signal. The signal conditioning circuit is used for carrying out filtering, polarity conversion and level conversion on the collected current signal and voltage signal. The A / D converter is used for converting the filtered current signal and voltage signal into a current digital signal and a voltage digital signal. The DSP chip is used for pre-processing the current digital signal and the voltage digital signal, sending the signals to the FPGA chip, carrying out post-operation on the signals processed by the FPGA chip, outputting the signals, and giving out an alarm when harmonics are abnormal. According to the invention, the harmonics of an electric propulsion system are monitored in real time; the bad influence of the harmonics on the electric propulsion system is reduced; and the navigation of a ship is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of pipeline vibration of ship power devices, in particular to a harmonic monitoring system for electric propulsion ships based on FPGA and DSP. Background technique [0002] With the extensive application of power electronic technology in ships, the number of electrical equipment has increased continuously, the level of ship automation has been significantly improved, and ship electric propulsion technology has also achieved rapid development. At the same time, power quality problems cannot be ignored. Non-linear and impact loads bring about harmonics, three-phase unbalance, voltage fluctuations, flicker and other power quality problems during the operation of ships. Reliability and security have had some impact. For example, the 18,000-ton semi-submersible ship "Tai'ankou" produced by my country's Guangzhou Shipbuilding International Co., Ltd. is a full-electric propulsion ship that uses the SSP-5 pod-type...

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Problems solved by technology

[0003] (1) The ship power grid is an independent small-capacity power grid with a complex environment and extensive use of power electronic converters. The impact of harmonics is more significant than that of land power grids. High-frequency harmonic voltage and current will cause increased losses in motors, transformers, and transmission lines , causing the reliability and durability of the equipment in the system to decrease

[0004] (2) Make the relay protection, automatic device, computer system and measuring device operate abnormally or misoperate, resulting in a decrease in the safety of the ship's operation

[0005] (3) A large amount of electromagnetic interference is caused, which affects the navigation system and communication system, causing them to fail to work normally

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