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Low voltage ride through control method of grid-connected photovoltaic power generation system

A low-voltage ride-through and grid-connected power generation technology, applied in photovoltaic power generation, AC network voltage adjustment, AC network circuits, etc., can solve problems such as the inability to eliminate fluctuations in DC side voltage twice the power frequency

Inactive Publication Date: 2016-07-06
SHANGHAI DIANJI UNIV
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Problems solved by technology

[0003] In the field of wind power, there are many studies on low-voltage ride-through control technology. However, there are relatively few research results on photovoltaic low-voltage ride-through, and most of the existing control schemes are based on low-voltage ride-through when symmetrical faults occur on the grid side. Through the control method, but this assumption is not always true, a large number of field statistics show that the number of asymmetrical falls is much higher than the number of three-phase symmetrical drops
Therefore, scholars at home and abroad have also done related research on the control method of photovoltaic inverters under the asymmetric drop of the power grid, and proposed a control strategy to suppress the negative sequence current, which can effectively suppress the negative sequence current on the AC side and make the three The phase current is balanced, but due to the existence of negative sequence voltage, the fluctuation of the DC side voltage twice the power frequency cannot be eliminated

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Embodiment Construction

[0040] The embodiments of the present invention will be described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0041] The invention takes the photovoltaic inverter, the core component of the photovoltaic grid-connected power generation system, as the research object, first analyzes its mathematical model, and obtains the mathematical model in the three-phase ABC static coordinate system, and then analyzes respectively through the coordinate transformation theory. The mathematical models in the two-phase αβ st...

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Abstract

The invention discloses a low voltage ride through control method of a grid-connected photovoltaic power generation system. The method comprises the following steps of: firstly, establishing a mathematical model of a photovoltaic inverter when the power grid is unbalanced; secondly, analyzing current control on an alternating current side, and when the voltage of the power grid drops asymmetrically, controlling the photovoltaic inverter with the control target of eliminating 2 times power frequency fluctuation of the active power; and thirdly, forcing an output current of the photovoltaic inverter to follow a current command value given in advance within a switching period so as to suppress voltage fluctuation on the direct current side. According to the invention, the voltage fluctuation on the direct current side can be reduced, the voltage across the direct current side remains stable, and the stable operation of the integrated system is ensured.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation systems, in particular to a low voltage ride-through control method of a photovoltaic grid-connected power generation system based on predicted current. Background technique [0002] As an inexhaustible energy source, solar energy has developed rapidly in its power generation market, and photovoltaic grid-connected technology has become the focus of research. Among them, low voltage ride-through technology is considered to be one of the biggest challenges in photovoltaic grid-connected power generation control technology. [0003] In the field of wind power, there are many studies on LVRT control technology. However, there are relatively few research results on PV LVRT at present, and most of the existing control schemes are based on the low voltage proposed in the case of symmetrical faults on the grid side. Through the control method, but this assumption is not always true...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/16
CPCH02J3/16H02J3/383H02J2203/20Y02E10/56Y02E40/30
Inventor 徐英杰曾宪文高桂革陈原谢涛孙博力余星儒
Owner SHANGHAI DIANJI UNIV
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