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HydroStab

This module is dedicated to calculating the stability of a speed regulator in the operation of a hydroelectric unit.

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ABSTRACT

HydroStab represents a functional box built in Scilab language, in the HYDROTUR software suite, and is dedicated to calculating the stability of a speed governor controlling a hydroelectric machine of the FRANCIS, KAPLAN, PELTON type.

HydroStab Solution provides the adjustment parameters of a series-parallel PID corrector allowing the operation of a hydroelectric unit, with a safety margin, and without divergence when commissioning the regulator on site.

Prior to the study, an Excel CALTUR sheet establishes a reduction of the hydraulic diagram, in accordance with the data from the plant (length of pipes per section, adjoining sections), and determines the equivalent length and section of a single group.

These results are then to be entered in HydroStab.

HydroStab then determines a convergence domain to be reached and provides a quadruplet (K p , T i , T d , K d ), with graphical program proof.

The main method adopted is based on a mathematical technique based on the Nyquist space, and proposes to force the passage of the transfer function in open loop, by a point P, to guarantee a gain margin of 6 dB, with a fixed module margin ma=0.42.

This value is generally commonly accepted in the turbomachinery adjustment system, and is recommended by Electricité de France.

HydroStab complies with international standards IEC 60308 and 61362 in the calculated results.

Other methods (Ziegler-Nichols, Takahashi) are also integrated into HydroStab for comparative studies.


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