Nominal costs are: ? Real Estate 0.25 $/m 2 Site Preparation 0.40 $/m 2 Support Structure 6. 00 $/m 2 RF-DC Subarrays 4.00 $/m Power Distribution and Control 45. 00 $/kW (See Section 9. 6) {2. 50 $/m for 5 GW) The RF-dc subarray cost is madc up of: , Schottky Barrier Diode 2. 84 $/m Rectenna Circuit and Diode Assembly 3. 16 $/m We see that the support structure is the highest cost item. The diodes are the single most costly component and must be produced at about 1 cent each in quantities of billions to meet the target. The learning curve behavior for diodes shown in Figure 9-19 lends support to this estimate. The rectenna element assembly must also be produced in a high speed, low cost process. The scheme illustrated as an example in Figure 9-20 starts out with two spools of rectangular aluminum wire and one spool of dielectric ribbon material. Three forming machines produce the three pieces which flow together in a continuous process. 9. 6 POWER INTERFACE ESTIMATES Figure 9-21 is a simplified plane view of the general configuration analyzed. The total rectenna area has been subdivided into 5 main feeders, with each feeder handling 1000 MW, for a total rectenna output power of 5000 MW, Each main feeder receives power from 1000 - 1 kW inverters. These inverters serve the multiple functions of dc to ac inversion, phase synchronization and switchgear. The analysis assumes that a three phase ring inverter (see Figure 9-22) is suitable for the intended application. Input power to the inverter will be 1000 volts de and the output voltage of the inverter will be 66 kV rms, three phase 60 Hz. Further conversion of the voltage can be performed at the interface with the transmission system if required.
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