Relay failure detection device and method for grid-connected inverter

Abstract

The invention relates to the technical field of detection, in particular to a relay failure detection device and a relay failure detection method for a grid-connected inverter. The device comprises a relay module 1, a driving module 2, a control module 3, a first signal acquisition module 41 and a second signal acquisition module 42, wherein one end of the relay module 1 is connected with an output end of an inverter 5, and the other end of the relay module 1 is connected with a power grid 6; the driving module 2 is connected with the relay module 1; one end of the first signal acquisition module 41 is connected with the output end of the inverter, and the other end of the first signal acquisition module 41 is connected with the control module 3; one end of the second signal acquisition module 42 is connected with the power grid 6, and the other end of the second signal acquisition module 42 is connected with the control module 3; and the other end of the driving module 2 is connected with the control module 3. By the invention, turn-off or turn-on failure of any one or more relays in the relay module 1 can be detected, a detection result is fed back to a user through a display module, and the reliability in relay redundancy design of an output stage of the inverter 5 is improved.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a relay failure detection device and method for a grid-connected inverter. Background technique [0002] New energy comes directly or indirectly from the sun or the energy generated deep inside the earth. New energy is also called clean energy, including solar energy, wind energy, biomass energy, geothermal energy, nuclear fusion energy, water energy and ocean energy. The energy generated by biofuels and hydrogen derived from renewable energy, compared with traditional energy sources, new energy sources generally have the characteristics of less pollution and large reserves, which are very important for solving the serious environmental pollution problems and the depletion of resources (especially fossil energy) in today's world The problem is of great significance, and solar energy generally refers to the radiant energy of sunlight, and its main utilization forms include three...

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Problems solved by technology

[0007] figure 1 In the prior art shown, the relays K1 and K2 are set as one group and driven by drive signal 1, and the relays K3 and K4 are set as another group and driven by drive signal 3. In this way, the inverter Before the relay is connected to the power grid, it can only detect that a group of relays have open and close failures at the same time, but it cannot detect any one or more relays that fail to open, nor can it detect any one or more relays that fail to close

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