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Relay self detecting method based on grid connected inverting system

A relay circuit and inverter system technology, applied in the direction of circuit breaker testing, etc., can solve problems such as damaged inverters and machines not being able to protect, and achieve the effect of optimizing the detection process

Inactive Publication Date: 2015-02-18
爱士惟科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a fatal problem in this scheme, that is, before closing the third relay and the fourth relay, the situation that the first and second relays are stuck is not ruled out. If the first and second relays are stuck, go to close The third and fourth relays, then the mains energy will be directly poured into the inverter bridge, which will not protect the machine and even damage the inverter.

Method used

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  • Relay self detecting method based on grid connected inverting system
  • Relay self detecting method based on grid connected inverting system

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Embodiment

[0046] Such as figure 1 As shown, a relay circuit structure based on a grid-connected inverter system is used for self-checking each relay in the relay circuit connected to the grid-connected inverter system. The first relay RLY1, the second relay RLY2, the third relay RLY3 and the fourth relay RLY4 are turned off and on, and the first relay RLY1 and the third relay RLY3 are connected in series by the grid-connected inverter system. On the power transmission path of the power grid, the second relay RLY2 and the fourth relay RLY4 are arranged in series on the power transmission circuit connected from the power grid to the grid-connected inverter system, and the first relay RLY1 and the second relay RLY2 are respectively connected to the grid-connected inverter system, the third relay RLY3 and the fourth relay RLY4 are respectively connected to the power grid, and the common end of the first relay RLY1 and the third relay RLY3 is connected to the second A first voltage sampler ...

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Abstract

The invention discloses a relay self detecting method based on a grid connected inverting system and aims to solve the self detection problem of a redundant design relay set. The self detection judging method is complete and is capable of judging whether a relay is damaged, abnormal or not effectively, the detecting process is optimized, and the hidden damage on an inverter by detection is eliminated.

Description

technical field [0001] The invention relates to a relay circuit based on a grid-connected inverter system, in particular to a self-checking method for the relay circuit based on a grid-connected inverter system. Background technique [0002] In the grid-connected safety regulations of various countries, there is a description of the need for a relay circuit between the grid-connected inverter and the mains to ensure the necessary safety distance. For example, the German VDE requires that the photovoltaic power generation side and the AC side of the mains must meet basic insulation 3.0 mm spacing, and at the same time need to meet the redundant protection function. At present, the solution chosen in most applications is to connect two relays in series to meet safety requirements. [0003] As an important safety component of the grid-connected inverter: the reliability of the relay itself is very important. It is necessary to carry out self-test confirmation before grid-conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
Inventor 杨文杰程进
Owner 爱士惟科技股份有限公司