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Island detection method of active photovoltaic energy storage system

A photovoltaic energy storage and island detection technology, applied in the field of power control, can solve problems such as poor reliability and defects, and achieve simple and reliable detection methods

Inactive Publication Date: 2015-01-28
安徽启光能源科技研究院有限公司
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Problems solved by technology

The principle is to add disturbance components to the control signal, so that the frequency or power changes, but the current active island detection still has defects and poor reliability

Method used

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  • Island detection method of active photovoltaic energy storage system
  • Island detection method of active photovoltaic energy storage system
  • Island detection method of active 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 island detection method of an active photovoltaic energy storage system. A grid-connected photovoltaic power generation system is composed of a photovoltaic module and an inverter, the photovoltaic module is connected to a public supply system through the inverter and a breaker, a local load is connected to a common coupling point between the inverter and the breaker, a slightly-distorted current is injected into a power grid during detection, and the frequency continuous changing trend is accordingly formed. When the photovoltaic power generation system is connected with the power grid, the frequency of the power grid cannot be changed; when the photovoltaic power generation system is separated from the power grid, the frequency of the voltage output by the inverter is forced to increase and decrease. The island detection method is simple and reliable.

Description

technical field [0001] The invention relates to the field of power control, in particular to an islanding detection method. 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 ...

Claims

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Application Information

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IPC IPC(8): H02J3/38G01R31/00
CPCG01R31/50H02J3/383H02J3/388Y02E10/56
Inventor 王琦姜广宇王海松蔡旭
Owner 安徽启光能源科技研究院有限公司
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