A method for estimating back pressure data when circulating water pumps start and stop in power stations

Abstract

The invention discloses a method for estimating backpressure data during starting and stopping of a power station circulating water pump. The method comprises the steps that firstly, a prediction data sample set is obtained by collecting original data of corresponding units and screening original data samples; then, running data are collected, and a new data sample set is obtained by updating the original data samples or adding new samples into the original data samples; finally, training and modeling are carried out by inputting training samples into a least square support vector machine, and then the best parameter value of a model is found through the tunelssvm optimization function. According to the method for estimating the backpressure data, information is mined in a data base, effective information is screened out, a sample database is updated through self-learning, and the relevance among the data is mined through the support vector machine, so that prediction of backpressure changes during starting and stopping of the circulating water pump is achieved, and the sample database is continuously updated and corrected along with time.

Description

technical field [0001] The invention relates to a method for estimating back pressure data when a circulating water pump of a power station starts and stops. Background technique [0002] The size of the vacuum of the condenser has two effects on the operation of the unit. If the vacuum of the condenser is too high, the axial thrust of the turbine will be increased, resulting in an increase in the temperature of the thrust Vaugin and oil return, which will affect the safe operation of the turbine; if the vacuum of the condenser is too low, the temperature of the exhaust cylinder of the steam turbine will increase. The heat consumption increases, the efficiency decreases, the turbine bearing center shifts, and in severe cases, it will cause the turbine to vibrate. Therefore, it is very important to accurately predict the change of condenser vacuum when the circulating water pump starts and stops. Considering that in the actual operating environment on site, there are many f...

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Problems solved by technology

Considering that in the actual operating environment on site, there are many factors that affect the vacuum of the condenser, such as the temperature of the circulating water inlet, the exhaust steam flow of the steam turbine, the cleanliness of the condenser, and the circulating water flow, etc. At the same time, the circulating pumps of most power plants are If the flow cannot be adjusted continuously, there is no direct method to measure the circulating water flow, and the value obtained through simple calculation often does not have the accuracy that can be applied in engineering practice

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