Control method for tracking MPPT device by maximum powers point used for photovoltaic cell array
A maximum power point, photovoltaic cell technology, applied in photovoltaic power generation, control/regulation systems, and adjustment of electrical variables, etc., can solve the problems of inability to control the output voltage, low cost, low power generation efficiency, etc. All-in-one, simple results, preventing back-and-forth effects
Inactive Publication Date: 2016-02-24
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
Solar energy has the advantages of no pollution, no noise, and zero carbon emissions, but its power generation efficiency is not high, and the cost is not low. Since it is necessary to invest, it is undoubtedly a matter of concern to maximize its energy efficiency
Previously, we have done a solar array model, from which we learned that the power of the array is affected by light and temperature, but we cannot directly control the output voltage through light and temperature to make the power reach the maximum value, but this is very difficult in engineering. Difficult to achieve
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[0036] The present invention adopts DSP28335 as the core processor. In order to realize the integration of imitation and control, the control program module of MPPT is built in Matlab, and the communication between upper computer-PC and lower computer-DSP is realized by using CCS3.3 software and XDS510plus emulator. , the simulation principle is as Figure 4 shown. On the host computer Matlab builds such as figure 1 A model of the solar array is shown, where, I sc is the equivalent short-circuit current of the photovoltaic array, U oc is the open circuit voltage of the photovoltaic array, U and I are respectively the load terminal voltage, R s is the equivalent series internal resistance of the array.
[0037] The P-U curves of the model of the solar array at different temperatures, such as figure 2 shown. Different light corresponds to a different curve. When the light changes slowly and continuously, its maximum power point also changes. When the temperature changes, ...
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The invention discloses a control method for tracking an MPPT device by a maximum power point used for a photovoltaic cell array. The method comprises following steps of: step 1, providing initial voltage by a DSP controller; step 2, sequentially searching for three sampling points based on a power P-voltage U curve and calculating gradients corresponding to straight lines of the sampling points; step 3, calculating the product for a first gradient K1 and a second gradient K2 and determining the product; and step 4, using a Newton inserting method to fit the three sampling points in the raised nature determined by the step 3. The control method for tracking the MPPT device by the maximum power point used for the photovoltaic cell array has following beneficial effects: a DSP28335 is adopted as a core processor; a control program module of the MPPT is set up in Matlab; by utilizing CCS3.3 software and an XD510plus emulator, communication between a host computer-PC machine and a lower computer-DSP controller is achieved; real time control is realized and copy-control integration is obtained.
Description
technical field [0001] The invention belongs to the field of photovoltaic cell array control, and in particular relates to a control method for an MPPT device for a photovoltaic cell array based on the integration of imitation and control. Background technique [0002] The Copenhagen United Nations Climate Change Conference held in Denmark in December 2009 has ended. China promised to delay the emission of carbon dioxide, that is, by 2020, China's carbon dioxide emission per unit of gross domestic product (GDP) will be reduced by 40%-45% compared with 2005. This means that the country will vigorously develop new energy sources so as to reduce the consumption of high-carbon materials such as fossil coal and petroleum. Solar energy has the advantages of no pollution, no noise, and zero carbon emissions, but its power generation efficiency is not high, and its cost is not low. Since it needs to be invested, it is undoubtedly a matter of concern to maximize its energy efficiency...
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Login to View More IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 时姗姗袁加研方陈张志伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO