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Grid-connected photovoltaic power generation system and its automatic phase shift islanding detection method

A photovoltaic power generation system and islanding phenomenon technology, which is applied in the field of grid-connected photovoltaic power generation system and its automatic phase shift islanding phenomenon detection, can solve the problems of poor accuracy and low detection speed, and achieve the effect of improving accuracy and speeding up detection speed

Inactive Publication Date: 2016-03-16
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0004] The invention provides a grid-connected photovoltaic power generation system and its automatic detection method for phase shift islanding phenomenon, the purpose of which is to solve the problems of low detection speed and poor accuracy in the previous methods

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  • Grid-connected photovoltaic power generation system and its automatic phase shift islanding detection method
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  • Grid-connected photovoltaic power generation system and its automatic phase shift islanding detection method

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Embodiment Construction

[0032] The present invention proposes a grid-connected photovoltaic power generation system. The system mainly includes a grid 1, a photovoltaic panel 5 and a photovoltaic inverter 4. The grid 1 is connected to a local load 3 through a grid-connected switch 2 to supply power to the local load 3; The solar panel 5 is connected to the local load 3 through the photovoltaic inverter 4 to supply power to the local load 3 .

[0033] The islanding phenomenon generated by the above grid-connected photovoltaic power generation system is as follows:

[0034] When the grid 1 is working normally, it is equivalent to the grid-connected switch 2 being closed. At this time, the active power P output by the photovoltaic power generation system via the photovoltaic inverter 4 pv , reactive power Q pv , and the active power P provided by grid 1 g , reactive power Q g, and supply power to the local load 3 at the same time; since the capacity of the grid 1 is infinite, the voltage U output by ...

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Abstract

The invention belongs to the field of photovoltaic power generation, and specifically relates to a grid-connected photovoltaic power generation system and its automatic phase displacement islanding detection method. On the basis of the traditional slip frequency displacement method, the relationship between the initial phase angle and frequency is redesigned. The relationship function introduces an adjustable parameter and adds a phase balance point judgment procedure. Once the system enters the phase balance point, the purpose of jumping out of the phase balance point can be achieved by changing the adjustable parameter in the initial phase angle calculation formula. , this method solves the problem that once it enters the phase balance point, it cannot jump out, which leads to the failure of islanding detection, and greatly improves the accuracy of grid fault detection.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and in particular relates to a grid-connected photovoltaic power generation system and an automatic phase shift islanding phenomenon detection method thereof. Background technique [0002] The islanding phenomenon that the grid-connected photovoltaic power generation system continues to supply independently due to the sudden power failure of the power grid will bring adverse effects such as damage to equipment and personal safety. There are industry standards that suggest that the islanding phenomenon generated by the system must be detected within 0.5 seconds, and can be disconnected from the power grid in time. Therefore, the research on the detection method of islanding phenomenon is one of the key technologies to be solved in the field of photovoltaic grid-connected power generation. At present, the detection methods of islanding phenomenon can be divided into two categories: act...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G01R31/00
CPCY02E10/56
Inventor 金石张凤阁王育欣
Owner SHENYANG POLYTECHNIC UNIV
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