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Islanding detection method for photovoltaic energy storage system

An island effect and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as damage to equipment connected to the power grid, and achieve the effects of avoiding misjudgment, improving equipment adaptability, and accurate detection

Inactive Publication Date: 2015-01-07
安徽启光能源科技研究院有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

At this time, the grid already has a fault, which will cause damage to the equipment connected to the grid, so a method with higher sensitivity to detect the isolated grid effect is needed

Method used

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  • Islanding detection method for photovoltaic energy storage system
  • Islanding detection method for photovoltaic energy storage system
  • Islanding detection method for photovoltaic energy storage system

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Embodiment Construction

[0014] Such as figure 1 As shown, the grid-connected photovoltaic power generation system consists of photovoltaic modules and inverters, and the power generation system is connected to the public grid through a circuit breaker. Since there is no transformer in the middle, the system is a non-isolated system. Local loads are simulated using parallel RLC circuits. The inverter, the load and the circuit breaker are connected to one point, which is the point of common coupling (Point of Common Coupling, PCC). Assume that the active power and reactive power provided by the inverter to the load are P D , Q D ; The active power and reactive power provided by the grid to the load are P G , Q G ; The active power and reactive power consumed by the load are P L , Q L .

[0015] When the system is connected to the grid, the following relationship exists:

[0016] P L =P D +P G (1)

[0017] Q L =Q D +Q G (2)

[0018] in: P L ...

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Abstract

The invention discloses an islanding detection method for a photovoltaic energy storage system. A grid-connected photovoltaic power generation system comprises a photovoltaic module and an inverter, wherein the photovoltaic module is connected to a public supply network through the inverter and a breaker; a local load is connected to a point of common coupling between the inverter and the breaker; the islanding detection method is characterized in that when the power grid is disconnected, if the active power and the reactive power are matched, and the condition that (1-U2 / U0) is smaller than PG / PL smaller than (1-U1 / U0) is satisfied, the islanding detection is not conducted. The islanding detection method disclosed by the invention has the advantages that the method can reliably and accurately detect the islanding, increase the strain capacity of the equipment, and avoid misjudgment.

Description

technical field [0001] The invention relates to a control method under the island operation state of electric equipment. Background technique [0002] The island effect means that when the grid power supply is interrupted due to failure or maintenance, the distributed grid-connected power generation system (such as photovoltaic power generation, wind power generation, fuel cell power generation, etc.) at each user end fails to detect it in time and cut itself off from the public power network , thus forming a self-powered island power generation system composed of distributed power generation systems and local loads. The islanding effect will seriously endanger the safety of system equipment and the personal safety of relevant personnel. Therefore, in distributed power generation systems including photovoltaic grid-connected power generation systems, grid-connected power generation devices should have the ability to detect and protect islands. [0003] In grid-connected pho...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 姜广宇王海松王琦叶程广
Owner 安徽启光能源科技研究院有限公司
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