The concept of extended linearisation for nonlinear control design yields control systems for which the linearisations have eigenvalues independent of the operating point. The computations of the procedure is complicated. There are systems where the parameterisation of the operating points by the input cannot be directly applied. A novel method of parameterisation of the operating point which overcomes these disadvantages is proposed. Its effectiveness is proved by application to the stabilisation of a synchronous generator, which is a problem of great importance in power systems control. The results are compared with conventional control using a linear pole-placing controller. The robustness of the proposed nonlinear control is also considered.