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| Abstract: Any meaningful criteria to be used in the implementation of harmonic limitations is entirely dependent on the availability of Computer Models and Instrumentation capable of predicting and monitoring accurately the harmonic levels of the Power System. This paper presents the author's assessment of present state and prospective needs in modelling and monitoring techniques with reference to AC-HVDC system harmonics. The two specific sections of this topic, i.e. Calculation Methods and Measurements are now considered separately. |
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| Abstract: The general acceptance of power electronics as a means of improving the controllability of the synchronous power system has increased dramatically the problem of power system harmonics. With the alarming growth in power convertor ratings the analytical models required for harmonic analysis need to be much more elaborate than in the past. The level of complexity of the model to be used in each case will depend on he economic consequences of the predicted behaviour and on the availability of suitable computer hardware and software. A review of the facilities presently available and the techniques still under development is made in this paper. These are described with reference to the general diagram of Figure 1, which lists the various alternative models in five levels of increasing complexity. |
| Abstract: An examination of the electrical stresses which may be imposed upon metal oxide surge arresters in a dc converter station is undertaken. Simulation in the time domain using a digital computer program is the method of study. Detailed models of a dc link were developed for temporary overvoltage stresses and steep front stresses. The most critical stresses for each type of dc station arrester are identified. This paper summarizes research effort undertaken on behalf of CEA for project No. 214 T 565, "Performance of Metal Oxide Gapless Surge Arresters for HVDC Systems -Phase I". |