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Abstract:A new pattern of space coordinate system based on sun-tracking surface has been introduced in this paper. The calculation of shadow area between HCPV trackers has been simplified within this kind of coordinate system. The spaces between rows and columns of HCPV arrays can be calculated accurately. Therefore, an appropriate layout of trackers arrangement for a HCPV power plant can be determined and designed by use of this method.

High concentrating photovoltaic (HCPV) is a promising technique for the practical commercial utilization of solar energy. However, the performance of a HCPV system is significantly influenced by environmental parameters such as solar direct normal irradiance (DNI) level and environmental temperature. This paper analyzes the performance of a 9 kW p grid-connected HCPV system in Kunming (Yunnan, China), during practical field operations over an entire year, and discusses how the environmental parameters influence the performance from both the energy conversion and power inversion perspective. Large variations in the performance of the HCPV system have been observed for different months, due to the respective changes in the environmental parameters. The DNI level has been found to be a dominant parameter that mainly determines the amount of energy production as well as the performance ratio of the HCPV system. The environmental temperature and wind velocity have less influence on the system performance ratio than expected. Based on the performance of the present HCPV system, a quantified correlation between the output power and the direct normal irradiance has been derived, which provides guidelines for both the cogent application and the modeling of HCPV techniques for grid-connected power generation.

A major issue in the successful realization of energy transformation in the 14th Five-Year Plan period is to solve the problem of optimizing the allocation and coordinated development of new energy and flexibly adjusting resources. During the 14th Five-Year Plan period, if the current new energy installation distribution ratio of the eastern and western regions is still maintained, it will be very difficult to control the overall curtailment rate of the new energy in the State Grid Management area below 5%. Another development option is to further tilt the installation of new energy towards the central and eastern regions, make full use of the local accommodation space in the central and Eastern regions. It is easier to achieve the total curtailment rate of new energy within 5%, and at the same time, the total installed capacities of new energy in the whole country can be further increased. It is also suggested that during the 14th Five-Year Plan period, the curtailment rate restriction should be relaxed to 8% moderately, which not only has better overall system economy, but is conducive to supporting a larger scale of new energy development and increase the proportion of new energy generation in total power generation.

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