Abstract
As a kind of reactive power compensation equipment, a synchronous condenser has advantages of strong overload capacity and effective suppression of commutation failures. It has been widely used in AC/DC power transmission systems. In this paper, the excitation control modes of the synchronous condenser during grid-integration at the speed-falling stage are studied with three contributions: (1) The necessity of using the exciter at the speed-falling stage and the associated excitation control characteristics are analysed. The dynamic behaviours with different mono-excitation-control modes are compared with identification of the merits and drawbacks. (2) In order to smooth the voltage rising curve during the stator voltage establishment at the speed-falling stage so as to enhance the reliability of starting the synchronous condenser, a sequential hybrid control scheme is proposed with PID controller for excitation at the initial and final stage, and for constant excitation at the middle stage. (3) In order to mitigate the oscillations during grid-integration, a control scheme of pre-insertion of an energy-absorption impedance (EAI) is proposed. The effectiveness and superiority of the proposed sequential hybrid excitation control mode with pre-insertion of an EAI for smoothing the voltage rising curve and mitigation of the oscillations are justified by the simulation results in PSCAD/EMTDC.
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