Method for maintaining maximum power point of photovoltaic power generation system
A photovoltaic power generation system and maximum power point technology, applied in photovoltaic power generation, control/regulation systems, and regulation of electrical variables, can solve problems such as increasing the number of multiplication and division operations, discounting the practicality of algorithms, and increasing time complexity, etc., to achieve Less multiplication and division operations, reduced time complexity and space complexity, and improved real-time performance
Inactive Publication Date: 2012-08-15
ZHEJIANG SCI-TECH UNIV
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It can be seen from formula (4) that judging the coefficient of the quadratic term will increase the number of multiplication and division operations, and the time complexity of this method will further increase
Therefore, although the interpolation estimation of the MPP of the photovoltaic power generation system can effectively eliminate the energy loss caused by the vibration of the system near the MPP while taking into account the tracking accuracy, if the Lagrange interpolation method is used to realize this process, it will inevitably increase the difficulty of the algorithm , the practicability of the algorithm will be greatly reduced
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[0041] The method for maintaining the maximum power point of the photovoltaic power generation system in the present invention uses Newton's secondary interpolation to estimate the MPP of the photovoltaic power generation system, and the principle is as follows:
[0042] Such as figure 1 As shown, a0 (u0, P (u0)), a1 (u1, P (u1)), a2 (u2, P (u2)) are three (U, P) interpolation nodes near the photovoltaic power generation system MPP, P (u0) is the corresponding power when the measured photovoltaic cell terminal voltage is u0, and the rest are the same.
[0043] According to the second-order difference quotient table in Table 1, the Newton quadratic interpolation function N2(u) can be obtained as:
[0044] N2(u)=P(u0)+P[u0,u1](u-u1)+P[u0,u1,u2](u-u0)(u-u1) (7)
[0045] in:
[0046] (8)
[0047] make , the operating voltage Up of the MPP based on Newton's quadratic interpolation can be obtained
[0048] (9)
[0049] From equati...
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The invention discloses a method for maintaining a maximum power point of a photovoltaic power generation system. The method includes: estimating the maximum power point of the photovoltaic power generation system by means of Newton quadratic interpolation, and then using a digital PID (proportion-integration-differentiation) adjustor in a DSP (digital signal processor) controller to control increase and decrease of duty ratio to enable the actual measurement terminal voltage of a photovoltaic cell to approach to a reference voltage. By means of Newton quadratic interpolation for estimation of the maximum power point of the photovoltaic power generation system, multiplication and division are less, algorithmic efficiency is high, and tracking timeliness of the system is improved. Repeated tracking is performed for multiple times by means of step shortening, and tracking precision is improved. Further, since Lagrange interpolation is replaced by the Newton quadratic interpolation for tracking of the maximum power point, time complexity and space complexity are effectively lowered, and the requirements on processor performance is lowered.
Description
technical field [0001] The invention relates to the technical field of MPPT (Maxium Power Point Tracking) of a photovoltaic power generation system, in particular to a method for maintaining the maximum power point of a photovoltaic power generation system. Background technique [0002] Solar energy is recognized as the new energy with the highest technological content and the most promising development prospects in the world. As a new type of energy system, solar power generation system (photovoltaic system) has attracted the attention and research of many countries, and will occupy an important position in the future energy structure, which is of great significance to energy consumption and the environment. Since the current main problem of photovoltaic systems is the low conversion efficiency and high price of batteries, how to further improve the conversion efficiency of solar cells and how to make full use of the energy converted by photovoltaic arrays has always been a...
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IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 张寅孩李智祝苇余诗宝林新涵卢可可
Owner ZHEJIANG SCI-TECH UNIV