Upper computer filtering method for generator temperature measuring system

Abstract

Provided is an upper computer filtering method for a generator temperature measuring system. The method is characterized by an upper computer recording temperature values with an interval of unit time T, and storing the temperature values to a queue C [N], the queue length being fixed to be N; placing new data sampled each time to the tail of the queue, and discarding the data at the head of the queue; and if refresh time of display temperature of a monitoring system is T', carrying out arithmetic average on the N data in the queue every an interval of T' to obtain a new filter value which is provided for the monitoring system to display and judge, wherein the setting of the T value is associated with required response speed of the temperature measuring system, and if the T is 1 s, the temperature values need to be recorded each second; the setting of the N value is associated with both the response speed of the system and the performance of filtering, the N value is neither too large nor too small, and the optimal setting of N meets the condition: N= T' / T; and the T' is the actual refresh time interval of the temperature values in the monitoring system. The upper computer filtering method for the generator temperature measuring system carries out filtering processing on the measured temperature signals, so that the response speed is guaranteed, and meanwhile, measuring error is reduced; and the method has the advantages of having a good interference suppression function and high smoothness and the like.

Description

technical field

[0001] The invention relates to a generator temperature measurement system, in particular to a host computer filtering method applied to the generator temperature measurement system. Background technique

[0002] The temperature measurement system of the power plant consists of a local temperature measurement device, a local control unit LCU and a host computer. The temperature measuring device is generally a temperature measuring resistor, such as PT100. The temperature converter in the local control unit LCU injects current into the temperature measuring resistance by generating a constant current source, and the resistance value of the temperature measuring resistance can be obtained by measuring the voltage at both ends of the resistance, and then the temperature can be calculated through the resistance value conversion formula value. At the same time, the signal can also be initially filtered to minimize the influence of various disturbances on the tem...

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