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Vol.9 No.2previous AASP17 (125-126-127-128-129-130-131-132-133-134-135-136-137-138-139-140-141-142) NT85

Academic Articles
Regular Paper Vol.9 No.2 (2017) p.132 - p.137

Reactivity Measurement Based on a New Finite-Time Convergent 2-Order Differentiator

Zhe Dong1,*

1 Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China

Reactivity measurement is crucial in monitoring nuclear reactors. Proper estimation of neutron flux derivative is one of the key to improve the reactivity estimation based on inverse kinetics (IK) method. Signal differentiation is widely used in system monitoring and control. The key problem in differentiator design is how to obtain a satisfactory tradeoff between differentiation exactness and robustness to uncertainties and noises. By proposing a new finite-time stabilizer for 2-order integrator chain, a new finite-time-convergent 2-order differentiator with bounded estimation error is developed. This differentiator is then applied to reactivity measurement through solving the IPK equation. Numerical simulation results not only verify the theoretical results but also show its satisfactory performance.
Reactivity measurement, differentiator, finite-time stability
Full Paper: PDF
Article Information
Article history:
Received 6 November 2016
Accepted 27 April 2017