A novel high-concentration PV technology for cost competitive utility bulk power generation

This paper describes an innovative design for a nominal 20 kW, integrated, high-concentration (260/spl times/) photovoltaic (IHCPV) system which has been developed for cost-effective, utility-scale bulk power generation. This technology set a new world record for efficiency: 20.3% under STC (18.5%, >20 kW at PVUSA operating conditions). High-concentration PV systems offer several advantages for low cost power generation: (1) cost reduction through the optimum utilization of silicon, (2) higher conversion cell (hence system) efficiency at concentration vs. one-sun, and (3) inherently higher capacity factor in high direct normal insolation areas because of its built-in tracking. Previously little progress has been made in deploying HCPV for large-scale electricity generation because of: (1) the lack of a stable, high performance, high-concentration solar cell, and (2) the high cost associated with the PV modules, structure, tracking system, and ancillary equipment. With the arrival of a stable high performance cell developed by AMONIX, high-concentration PV systems can now be realized. A novel integrated system concept greatly reduces the costs associated with system hardware and labor by: (1) integrating the load bearing structure and the Fresnel lens/receiver plate elements eliminating the need for separate modules, and (2) use of a manufacturing-worthy receiver plate which makes use of "circuit-board" construction techniques. A full-scale 20 kilowatt IHCPV system has been deployed, and test results which validate the system design are reported.