Research And Application Of On-line Monitoring System For Upstream And Downstream Water Quality In Hydropower Plant

In recent years,with the development of power industry and the expansion of hydropower plants,water resources have been widely used,and people pay more attention to water resources.In order to reduce water pollution,hydropower plants strengthen the treatment of equipment emissions.Due to the intervention of power plant,the balance relationship of downstream water resources in hydropower plant is destroyed,such as oil leakage accident,which seriously affects the downstream water quality and endangers the health of residents.Therefore,it is of great significance for hydropower plants to monitor the upstream and downstream water quality in real time to ensure that the water quality index is controlled within the scope of national safety standards.It is also a means of ensuring the economic and environmental protection operation of hydropower plants.Taking the upstream and downstream water quality PH value,chemical oxygen demand COD、 ammonia nitrogen and water oil as the research object,combined with the actual working conditions of hydropower plant,this paper puts forward the water quality monitoring method based on Lo Ra WAN wireless ad hoc network,and develops the on-line monitoring and warning system of upstream and downstream water quality in hydropower plant.To improve the accuracy of early warning system and signal acquisition,a mathematical model of soft threshold data denoising and fault discrimination based on wavelet analysis algorithm is established based on the COD and PH local signal waveform of water quality signal in hydropower plant.An improved wavelet transform based water quality anomaly detection method is proposed to reduce the influence of noise on sampling data.By using the soft threshold under the db4,the soft threshold can be used for on-line monitoring of water quality in hydropower plants.On the basis of the system and research methods developed above,the real-time observation of operators is realized through human-computer interaction,so as to accurately obtain the real-time monitoring and changing trend of water quality PH、 ammonia nitrogen,COD and water oil in hydropower plant.