Maximum power point tracking (MPPT) method and photovoltaic power generation system capable of realizing MPPT output
A technology of photovoltaic power generation system and maximum power point, which is applied in photovoltaic power generation, control/regulation system, and regulation of electrical variables, etc., and can solve problems such as slow dynamic response speed, extended adjustment response speed, and slow start-up speed
Pending Publication Date: 2018-07-10
泉州市春光照明科技股份有限公司
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Among the above three methods, the accuracy of the first method is not high, the second and third methods are slow to start, and the dynamic response speed is slow when the external environment changes drastically. At the same time, it is not easy to adjust when the temperature changes sharply, and it is easy to cause overload and prolong the adjustment response time. speed
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[0013] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.
[0014] refer to figure 1 , the preferred photovoltaic power generation system of the present invention that realizes MPPT output includes a photovoltaic panel array power generation assembly 1, a PWM controller 2, a separate small photovoltaic panel 5, a product circuit 3 and a test device 4, and the test device 4 includes an adjustable Load 41, current detection circuit 42, voltage detection circuit 43 and single-chip microcomputer 44, described small photovoltaic panel 5 and the photovoltaic panel unit in the photovoltaic panel array of photovoltaic panel array power generation assembly 1 are made of the same material, and described testing device 4 and small piece The photovoltaic panels 5 are connected and periodically tested in real time to obtain the maximum power point value of the small photovoltaic panels 5. The current detection circuit 42 ...
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The invention relates to the technical field of photovoltaic power generation, and provides a maximum power point tracking (MPPT) method and a photovoltaic power generation system capable of realizingMPPT output. The photovoltaic power generation system comprises a photovoltaic panel array power generation module, a pulse width modulation (PWM) controller, a small photovoltaic panel, a product circuit and a testing device, wherein the test device outputs a maximum power point value to the product circuit according to maximum power points, tested in all cycles, of the small photovoltaic panel;the product circuit calculates the maximum power point value of the whole photovoltaic panel array power generation module according to the product of the received maximum power point test value of the small photovoltaic panel and the power multiple of a ratio of a photovoltaic panel array to the small photovoltaic panel, and the result is sent to the PWM controller in real time; the PWM controller adjusts and controls the output of the entire photovoltaic panel array in real time according to the real-time maximum power point values received in all the cycles, so that the MPPT output of thephotovoltaic power generation system is realized. The method and the system solve the problems that the existing photovoltaic power generation system is lower in MPPT output accuracy and low in measuring efficiency.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a maximum power point tracking method and a photovoltaic power generation system for realizing MPPT output. Background technique [0002] At present, in recent years, the solar photovoltaic power generation industry has developed rapidly. Photovoltaic cells can convert solar energy into electrical energy to output external power. Since the output P-U characteristics of photovoltaic cells are affected by working conditions such as external temperature and light, the relationship is non-linear, so the relationship between the output power and output voltage of photovoltaic cells is also non-linear. . Usually, the maximum power point tracking technology needs to be used to control the output voltage of the photovoltaic cell array to make it work at the maximum power point. At present, according to the characteristics of the maximum power point tracking algori...
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Login to View More IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor秦曙伟
Owner泉州市春光照明科技股份有限公司