Method and device for detecting maximum power point of photovoltaic power generation
A maximum power point and detection device technology, applied in the field of solar photovoltaic power generation, can solve problems such as search failure, long search time, and excessive search
Active Publication Date: 2012-07-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
The current operating point is on the left and right of the maximum power point, and the search direction is opposite. If a fixed step size is adopted, the search will fail; if it is first judged to be on the left or right side of the maximum power point, although the search will not fail, if the step size is too large, the search will be overdone. , if it is too small, the search time will be long
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[0032] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0033] Please see first figure 1 , figure 1 It is a schematic diagram of a photovoltaic power generation system. As shown in the figure, a detection device for the maximum power point of photovoltaic power generation includes: an inverter unit 1, an MPPT control unit 2, a DC voltage sensor 3, a DC current sensor 4, and an AC voltage mutual inductance Device 5 and AC current transformer 6, the connection relation of above-mentioned parts is as follows:
[0034] The inverter unit 1 is connected between the photovoltaic cell 8 and the grid 9 , and the control terminal of the inverter unit 1 is connected with the control terminal of the MPPT control unit 2 .
[0035] In the photovoltaic cell output terminal circuit between the photovoltaic cell 8 and the inverter unit 1, re...
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The invention relates to a device for detecting a maximum power point of photovoltaic power generation. The device comprises an inversion unit, an MPPT (Maximum Power Point Tracking) control unit, a DC voltage sensor, a DC current sensor, an AC voltage transformer and an AC voltage transformer, wherein the inversion unit is connected between a photovoltaic battery and a power grid or load, and is connected with the control end of the MPPT control unit, the input end of the DC voltage sensor and the input end of the DC current sensor are respectively connected into a photovoltaic battery output end circuit, the input end of the AC voltage transformer and the input end of the AC current transformer are respectively connected into an inversion unit AC output circuit; and output ends of the DC voltage sensor, the DC current sensor, the AC voltage transformer and the AC current transformer are connected with the input end of the MPPT control unit. The invention also discloses a method for detecting the maximum power point of the photovoltaic power generation. The device and the method have the advantages of realizing that MPPT is searched in a variable step size manner, being high in speed and increasing electric energy production.
Description
technical field [0001] The invention relates to the field of solar photovoltaic power generation, in particular to a detection device and a detection method for the maximum power point of photovoltaic power generation. Background technique [0002] Energy is the material basis for the existence and development of human society. At present, energy shortage and environmental degradation are becoming more and more serious, which are global issues related to human survival and development. Renewable energy is a recyclable clean energy. Because of its abundant resources, it is not subject to geographical restrictions and can be used locally. It has huge development potential and application prospects. It is the hope of the future energy system. [0003] Solar energy is a huge amount of renewable energy. The energy directly radiated from the sun to the earth is very rich and widely distributed. It will not pollute the environment and is clean. China also has abundant solar energ...
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Inventor 李国杰江秀臣贾林壮
Owner SHANGHAI JIAO TONG UNIV