A photovoltaic inverter bimodal dynamic/static MPP tracking efficiency test method
A photovoltaic inverter and efficiency testing technology, applied in photovoltaic system monitoring, photovoltaic power generation, photovoltaic modules, etc., can solve problems that affect the overall efficiency of photovoltaic systems
Active Publication Date: 2016-08-31
STATE GRID CORP OF CHINA +2
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Problems solved by technology
In the actual use of photovoltaic arrays, affected by shadows, etc., its I-V curve will present multiple inflection points, resulting in a double-peak P-V curve of the photovoltaic array, which seriously affects the overall efficiency of the photovoltaic system.
There are currently no reports on the testing standards and methods for bimodal MPPT efficiency
Method used
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Embodiment
[0101] Analyze the loss of a 500kW photovoltaic array under different shading modes, and test the low-irradiance static MPPT efficiency. The array consists of 2000 pieces of Suntech 250W 25V Si-poly HiPerforma PLUTO. The combination of the array is 20 modules in series and 100 modules in parallel. The parameters of photovoltaic modules are shown in Table 1, and the I-V curve and P-V curve of each photovoltaic module in the array are as attached Figure 8 and attached Figure 9 shown.
[0102] Table 1
[0103] manufacturer
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The invention provides a photovoltaic inverter two-peak dynamic / static MPP tracking efficiency test method. The method includes the following steps that the maximum power point reached by photovoltaic arrays on the direct current side and the voltage range of an MPP of a photovoltaic inverter are determined; the photovoltaic arrays are selected and matched with the photovoltaic inverter; a single peak P-V curve of the photovoltaic arrays is determined; a two-peak MPP test efficiency P-V curve of the photovoltaic arrays is set and a photovoltaic inverter two-peak dynamic / static MPP tracking efficiency test is finished. According to the method, two-peak I-V curves of a direct current source under different powers and different blocking degrees are edited, the capability of the photovoltaic inverter for tracking the maximum power point of the two-peak I-V curves is tested and evaluated, and the gap in the aspect of tests and evaluation of two-peak I-V curve MPP tracking efficiency in the prior art is filled in.
Description
technical field [0001] The invention belongs to the detection field of photovoltaic inverters, and in particular relates to a method for testing the double-peak dynamic / static MPP tracking efficiency of photovoltaic inverters. Background technique [0002] In recent years, new energy represented by wind energy and solar energy has developed rapidly around the world. It is estimated that by 2020, the annual output of photovoltaic modules will reach 40GW. In this case, the power generation efficiency of the photovoltaic system is also receiving extensive attention. An important factor affecting the power generation efficiency of photovoltaic systems is the maximum power point tracking accuracy of photovoltaic inverters on the PV array P-V curve. [0003] According to the characteristics of photovoltaic modules, its ideal P-V curve is a unimodal parabola. When the photovoltaic inverter performs maximum power point tracking, it only needs to track the top of its single peak. ...
Claims
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IPC IPC(8): H02S50/10
CPCH02S50/00Y02E10/50
Inventor 黄晶生张军军董颖华丁明昌
Owner STATE GRID CORP OF CHINA
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