A method for testing the dynamic characteristics of the transfer function of a nuclear-level I&C system

Abstract

The invention discloses a dynamic characteristic testing method of a transfer function of a nuclear instrument control system. The method comprises the following steps: step I: designing and constructing a testing environment, and connecting a signal generator, the instrument control system and a waveform recorder; step II: allowing the signal generator to input a step signal to the instrument control system, outputting an analog signal after operation of the instrument control system, and allowing the waveform recorder to acquire input and output signal waveforms and form a waveform data file; step III: performing waveform data processing according to the output waveform data file, and calculating a transfer function parameter; step IV: recording algorithm step response output steady-state values, the calculated transfer function parameter and a waveform trend of output signals of the algorithm step response output steady-state values according to the waveform data processed result; and step V: comprehensively determining the correctness according to an output value after stable step response, the waveform trend of the output signals and the calculated transfer function parameter. The method is low in overall testing workload and implementation cost.

Description

technical field [0001] The invention relates to the technical field of testing a safety-level instrument and control platform in the nuclear power industry, in particular to a method for testing the dynamic characteristics of a transfer function algorithm of a nuclear-level instrument and control system. Background technique [0002] In order to realize its input signal data processing, the nuclear-level instrument and control system will use the first-order lag algorithm transfer function LAG, the first-order lead-lag algorithm transfer function LLAG, and the differential algorithm transfer function DIFFER transfer function algorithm. At present, nuclear-level instrument control systems at home and abroad Manufacturers test these transfer function algorithms for I&C systems, mainly including the following two methods: [0003] 1) Code dynamic testing adopts the white box testing method, including two methods: code simulation testing and software stub testing. The code simu...

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Problems solved by technology

[0008] 1. The code dynamic test can realize the verification of the operation results of the controller in each cycle, but the simulation environment or software instrumentation method used in the verification cannot directly reflect the dynamic characteristics of the real operation, and when the time parameter is large and the number of operation cycles is large , the test workload is heavy, and the test cost is high

[0009] 2. Static output test can only test the steady-state output of the transfer function algorithm function, and cannot test the dynamic characteristics

[0010] 3. Using the non-nuclear industry for transfer function parameter identification can verify the dynamic characteristics of the transfer function algorithm function, but the "system identification tool" tool of MATLAB software is required, which is clearly stipulated in the nuclear safety standard IEC60880-2006 for verification The software to be confirmed needs to be evaluated and evaluated to confirm its reliability. The general method is to carry out model selection analysis and verification evaluation. However, for MATLAB's "system identification tool" tool, the algorithm used is complex and the cost of verification and evaluation is high.

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