Abstract
In this work, a sensitivity analysis for the closed-form approach of irradiance sensing through photovoltaic devices is proposed. A lean expression to calculate irradiance on a photovoltaic device, given its operating point, temperature and equivalent circuit model, is proposed. On this expression, the sensitivity towards errors in the measurement of the photovoltaic device operating point and temperature is analyzed, determining optimal conditions to minimize sensitivity. The approach is studied for two scenarios, a stand-alone sensor and irradiance sensing on an operating power-producing photovoltaic device. A low-cost realization of a virtual sensor employing the closed form for monitoring performance of photovoltaic module is also presented, showing the advantage of this kind of simple solution. The proposed solution can be used to create a wireless sensor network for remote monitoring of a photovoltaic plant, assessing both electrical and environmental conditions of the devices in real time.
Highlights
Irradiance knowledge is a critical asset in the production of energy from photovoltaic (PV) conversion and its measurement, estimation and forecasting are a very active area of research [1]
A sensitivity analysis for the closed-form expression of the irradiance on a PV device was discussed in this work, along with a proposed prototype for irradiance measurement in field applications
The approach aimed at giving insight on the robustness of this expression with respect to the measurement setup and the operating point for the device itself
Summary
Irradiance knowledge is a critical asset in the production of energy from photovoltaic (PV) conversion and its measurement, estimation and forecasting are a very active area of research [1]. This quantity expresses the power density of solar radiation that reaches the photovoltaic device. Irradiance directly influences the electrical characteristic of the PV device [2,3], resulting in a different operating point and maximum deliverable power [4]. Temperature affects the electric characteristic of the PV device.
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