HVDC power transmission. Synchronous condensers control the a.c. voltage and the supply of reactive power. The SPS should operate at full available output. To accomplish this, the inverter must present to the rectenna the optimum load impedance. It is assumed that the rectenna is basically resistive in nature and there is an optimum d.c. load resistance for maximum power transfer. Normally, the system would be operated at optimum resistance so that the rectenna would reflect a minimum of power. The power level would be adjusted at the satellite and would usually be set at maximum available power. If power reduction is required by utility considerations and it could not be accomplished at the satellite, the converter power can be adjusted by means of moving the resistance off optimum. Of course, rf power would be reradiated but that might be acceptable under the circumstances. The converter module requires reactive power from the a.c. bus in approximate proportion to the active power being delivered to the utility network. This reactive power is supplied by static capacitors, harmonic filters, and synchronous condensers. Performance during the semiannual eclipse periods can be made largely automatic. As rf power decreases during the partial eclipse period, the converter, through its constant resistance load characteristics, will track the rectenna output and provide available power. The principle problem during these eclipse periods will be power dispatch in the a.c. system to preserve load and frequency. A mitigating factor will be that the power loss occurs at night when the a.c. system is most able to cope with it.
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