Grid-connected photovoltaic power generation system and automatic phase displacement islanding phenomenon detecting method thereof

A technology for photovoltaic power generation system and islanding phenomenon, 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 low detection speed and poor accuracy, and achieve the effect of improving accuracy and speeding up detection speed

Inactive Publication Date: 2014-01-15
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 automatic phase displacement islanding phenomenon detecting method thereof
  • Grid-connected photovoltaic power generation system and automatic phase displacement islanding phenomenon detecting method thereof
  • Grid-connected photovoltaic power generation system and automatic phase displacement islanding phenomenon detecting method thereof

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Embodiment Construction

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

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

[0034] When the power grid 1 is working normally, it is equivalent to the grid-connected switch 2 being closed. At this time, the active power P outputted by the photovoltaic power generation system through the photovoltaic inverter 4 pv , reactive power Q pv , and the active power P provided by grid 1 g , reactive power Q g, while supplying power to the local load 3; since the capacity of the grid 1 is infin...

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Abstract

The invention belongs to the field of photovoltaic power generation and particularly relates to a grid-connected photovoltaic power generation system and an automatic phase displacement islanding phenomenon detecting method thereof. On the basis of a traditional slip frequency displacement method, a relation function of an initial phase angle and frequency is re-designed, an adjustable parameter is introduced, and program for judgment of a phase balance point is added. Once the system is switched to the phase balance point, the purpose of jumping out of the phase balance point can be achieved by changing the adjustable parameter in an initial phase angle calculation formula. By means of the method, the problem that the phase balance point cannot be switched out once the system is switched to the phase balance point and accordingly islanding phenomenon detecting failure is caused is solved, and the accuracy of power grid failure detection is greatly improved.

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 detection method thereof. Background technique [0002] The islanding phenomenon caused by the continuous independent power supply of the grid-connected photovoltaic power generation system due to the sudden power failure of the grid will bring adverse effects such as damage to equipment and personal safety. Therefore, it is required that the grid-connected photovoltaic power generation system must have a protection function to prevent the islanding phenomenon. Some industry standards suggest that the islanding phenomenon generated by the system must be detected within 0.5 seconds, and it can be disconnected from the grid in time. Therefore, the research on the detection method of the islanding phenomenon is one of the key technologies to be solved in the field of ...

Claims

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Application Information

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Patent Type & Authority Applications(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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