A mlpe photovoltaic system and its photovoltaic string control method
A photovoltaic system and control method technology, applied in photovoltaic power generation, control/regulation systems, output power conversion devices, etc., can solve problems such as weak ability to reverse current
Active Publication Date: 2022-05-24
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
However, with the popularity of MLPE (Module Level PowerElectronics, module-level power electronics) equipment, the installation of MLPE equipment (such as figure 1 As shown in the middle switch / optimizer), the photovoltaic system will also increase, and the ability of MLPE equipment to withstand the inflow current is relatively weak. In extreme cases, the inflow current of 30% of the rated current will cause damage to the MLPE equipment
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[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0055] In this application, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also no Other elements expressly listed, or which are also inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the ph...
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The present invention provides an MLPE photovoltaic system and its photovoltaic string control method. The control method is applied to the control unit of the MLPE photovoltaic system. It first detects the output current of each photovoltaic string in the MLPE photovoltaic system, and then controls the output current of each photovoltaic string in the MLPE photovoltaic system. For each parallel photovoltaic string connected to the same inverter, control the voltage drop of the photovoltaic string with a larger output current, or control the voltage increase of the photovoltaic string with a smaller output current, so that the reverse current is reduced to a preset value. Within the scope, ensure that each MLPE equipment can bear it. That is to say, the photovoltaic string control method provided by the embodiment of the present invention, from the perspective of the MLPE photovoltaic system, realizes the limitation of the reverse flow current by controlling the voltage change of the corresponding photovoltaic string without increasing the hardware cost, effectively It protects each MLPE equipment in the MLPE photovoltaic system.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an MLPE photovoltaic system and a photovoltaic group string control method thereof. Background technique [0002] In the prior art, such as figure 1 As shown, two circuits (such as figure 1 The output terminals of the first photovoltaic string and the second photovoltaic string in the picture) or more (not shown) are connected in parallel to the inverter. Therefore, if a certain photovoltaic string in the photovoltaic system An abnormality will cause the normal PV string to apply reverse current to the abnormal PV string; among them, the abnormal PV string is usually: the number of PV modules in the string is small, some PV modules are shaded, some Some photovoltaic modules are faulty, some photovoltaic modules correspond to the circuit breaker or the optimizer is in a limited output state, etc. [0003] For example, as figure 1 As shown, if the first PV...
Claims
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Login to View More IPC IPC(8): H02M3/158G05F1/67
CPCH02M3/1584G05F1/67Y02E10/56G05F1/5735G05F1/06
Inventor 杨宇彭宇奇徐君
Owner SUNGROW POWER SUPPLY CO LTD