Delay eliminating method for signal of self-powered silver detector based on H2/H-infinity hybrid filtering

Abstract

The invention discloses a delay eliminating method for a signal of a self-powered silver detector based on H2 / H-infinity hybrid filtering. The delay eliminating method sequentially comprises the following steps of 1, establishing a nuclear reaction model of silver and thermal neutrons; 2, establishing a discrete state equation corresponding to the nuclear reaction model through decoupling transform; 3, determining the instant response share of the current of the self-powered silver detector; and 4, carrying out delay elimination on a current signal of the self-powered silver detector by using an H2 / H-infinity hybrid filter. When the delay eliminating method is applied, a current signal of a self-powered silver neutron detector can be subjected to delay elimination, and noise can also be effectively inhibited, so that the self-powered silver neutron detector can also be normally used under the instantaneous condition of a reactor; in addition, a filtering error variance corresponding to an error measuring channel is only required to have an upper bound in the method, so that the self-powered silver neutron detector can also be normally applied when an input signal is an indeterminable signal with limited energy.

Description

technical field [0001] The invention relates to a signal processing technology of a silver self-sufficient neutron detector used in a nuclear reactor power distribution on-line monitoring system, in particular to a signal delay elimination method of a silver self-sufficient detector based on H2 / H∞ hybrid filtering. Background technique [0002] The silver self-sufficient neutron detector used as the detector in the core of the advanced core measurement system, the secondary nuclide produced by the reaction of the sensitive material silver and the neutron undergoes beta decay to generate a current, and the magnitude and location of the current in a steady state The flux is directly proportional, so the neutron flux at its location can be deduced by measuring the silver self-supplied energy detector. Since the main component of this type of detector current is produced by the β decay of secondary nuclides, in the transient state of the reactor (the neutron flux level changes),...

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Problems solved by technology

[0004] At present, the elimination of signal delay applied to silver self-sufficient detectors is mainly based on the Kalman filter. It must be assumed that the external disturbance input signal of the system is a white noise signal with known statistical characteristics. When the input signal is a signal with finite energy Uncertain signals, whose statistical properties are difficult to obtain, the method is difficult to apply

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