This paper discusses the performcame of dyn,unic voltzzge control devices at the inverters of very we'& ac systems. The types of compensation considered are: a) Stzztic var compensator (SVC), b) Synchronous compensator (SC), c) A mix of the two and d) Fixed Capacitors. Although the primary purpose of these compensators is to control v o l~g e at the ac bus, their dynamic perform'mce during system disturb,ulces is a very important factor. The investigation includes the behavior of the v,Uous voltzzge control options under ac 'and dc disturbances. The paper shows that the SVC has the fastest response for load rejection type of overvoltages, but can cause serious problems with recovery during undervolmges caused by single phase faults.. . The CIGRE benchmark model for HVdc control studies has been modified and used in this study. In p'uticular the effect of local load has been included.
This paper deals with the application of the method of normal forms [ 1-51 in the analysis of a specific aspect of system dynamic behavior in the Manitoba Hydro system. Following a major loss of transmission capacity on the Manitoba Hydro HVDC system (Nelson River system), and the subsequent operation of protection systems, there is a major deficit of generalion in the remaining system, comprising Manitoba and Saskatchewan. The method of normal forms is applied to determine the natural groupings which are formed by the machines in Manitoba Hydro due to nonlinear interaction. This grouping then provides a basis for developing a systematic procedure to island the remaining system.
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