Control method for insulation detection modules of photovoltaic energy storage system

A technology of insulation detection module and control method, which is applied in the monitoring of photovoltaic systems, photovoltaic modules, photovoltaic power generation, etc., to avoid circuit damage and personal safety problems, improve efficiency, and improve detection accuracy.

CN111766448AActive Publication Date: 2020-10-13NINGBO GINLONG TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-13

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Abstract

The invention discloses a control method for insulation detection modules of a photovoltaic energy storage system. The control method comprises the following steps of: presetting an insulation resistance threshold value in a control module, and enabling the control module to transmit a detection instruction to each insulation detection module; acquiring insulation resistance to ground of a positive electrode and a negative electrode of each running battery unit and sending the acquired information to the control module by means of each insulation detection module; comparing the acquired information with the preset insulation resistance threshold value by means of the control module, and if the insulation resistance to ground of a certain battery unit is smaller than the insulation resistance threshold value, displaying that the battery unit is abnormal in insulation and giving an alarm by means of the control module; and if the insulation resistance to ground of each battery unit is greater than the insulation resistance threshold value, displaying normally by the control module, and meanwhile, maintaining operation of the insulation detection module on one path of battery unit inoperation, so that the insulation resistance to ground of the positive electrode and the negative electrode of the battery unit is acquired and detected when the insulation detection module is in different switch switching states, and controlling the rest insulation detection modules to be turned off.
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Description

technical field

[0001] The invention relates to the technical field of photovoltaic energy storage systems, in particular to a control method for an insulation detection module of a photovoltaic energy storage system. Background technique

[0002] In a photovoltaic energy storage system, the insulation resistance of the DC side to the ground represents the insulation performance of the DC system. If the insulation resistance is too low, it will cause the DC bus to discharge to the ground. In severe cases, it may cause system damage or even endanger people. Safety. For the safe use of the photovoltaic energy storage system, it is necessary to detect the insulation resistance of the positive and negative busbars to the ground. When the insulation resistance is less than the limit value, a fault will be prompted. Since some battery units in the photovoltaic energy storage system will be placed in the outdoor environment, long-term use of the battery units and exposure to the s...

Examples

Embodiment 1

[0038] see Figure 1-5 As shown, the present invention provides a control method for an insulation detection module of a photovoltaic energy storage system. The photovoltaic energy storage system includes at least two battery units 100 with a common DC bus. The battery unit 100 is a power supply module and an energy storage module. The power supply module is a photovoltaic cell, and the energy storage module is a storage battery; each battery unit 100 is correspondingly equipped with an insulation detection module 110 for collecting and detecting the positive and negative pole-to-ground voltage or resistance of the battery unit 100, and the insulation detection module 110 is equipped with The acquisition module, and each insulation detection module 110, each acquisition module and battery unit 100 are electrically connected to a control module 120 respectively, and the control module 120 can monitor the operating status of each battery unit 100. The control method includes the ...