Comprehensive quality evaluation technology for grid-connected photovoltaic (PV) power generation system

Abstract

The invention discloses a comprehensive quality evaluation technology for a grid-connected photovoltaic (PV) power generation system. The evaluation process includes the following steps: the total solar irradiation H incident on a PV array surface of the grid-connected PV power generation system is measured and calculated; the total solar irradiation energy E received by the grid-connected PV power generation system is calculated based on the area A of PV modules applied in the grid-connected PV power generation system, the number N of the applied modules, and the module declared efficiency [mu]STC, and the theoretical gross generation WDC (direct current) of the grid-connected PV power generation system is further obtained; monitoring statistics of the gross generation WAC (alternate current) of the grid-connected side of the grid-connected PV power generation system is carried out; the comprehensive quality evaluation coefficient of the grid-connected PV power generation system is calculated based on a formula, i.e. comprehensive quality evaluation coefficient R=actual gross generation WAC of the grid-connected PV power generation system/theoretical gross generation WDC of the grid-connected PV power generation system*100%. The comprehensive quality evaluation technology for the grid-connected PV power generation system has the advantage of easiness in calculation and operation as well as high practicability, thereby achieving the worthiness for wide popularization.

Description

technical field [0001] The invention relates to the technical field of photovoltaic applications, in particular to a comprehensive quality evaluation technology of a grid-connected photovoltaic power generation system. Background technique [0002] In recent years, China's photovoltaic application market has shown rapid development. The domestic photovoltaic installed capacity has surged from 140MW in 2000-2008 to 8.5GW at the end of 2012, with an average annual growth rate of 2.8 times. Along with the explosive growth of photovoltaic installed capacity, it is also a change in the domestic photovoltaic subsidy policy. In August 2013, the National Development and Reform Commission issued an urgent document "Notice of the National Development and Reform Commission on Exploiting Price Leverage to Promote the Healthy Development of the Photovoltaic Industry", which clarified the three categories of national photovoltaics. The benchmark on-grid electricity prices of centralized p...

AI Technical Summary

Problems solved by technology

This technology ignores the loss between the DC output of the photovoltaic array and the grid-connected point, and also ignores the concept that the installed capacity of the system is not equal to the power generation capacity, and cannot fully and comprehensively evaluate the power generation performance and construction of the grid-connected photovoltaic power generation system. quality evaluation

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