governor control for kakabeka falls generating station
abstract
this thesis examines a specific problem of governor control on a set of hydroelectric
turbines that suffer from severe wicket gate leakage. linear modeling and the steady state
behavior of each turbine is investigated and used to determine the best means of speed
control. findings show that a secondary water control device may be used with the
wicket gates to alleviate the effects o f leakage while the generator is disconnected from
the transmission system. the control method results in two distinct modes of turbine
operation, with each having significantly different dynamic characteristics.
a digital speed droop governor scheme is considered in a gain scheduling arrangement to
account for the two operating modes. the stability boundaries of the governor parameters
are investigated, and an output feedback cost minimization algorithm is used for
obtaining controller gains. an outline of the software used to implement the governor on
an industrial programmable controller is presented, and the experimental performance for
the turbines is compared to the theoretically developed model.
collections
- retrospective theses [1604]