A method for processing harmonic distortion of power grid

Abstract

The invention belongs to the field of electric power, and in particular relates to a method for processing harmonic distortion of a power grid. It includes: Step 1: Data input, input the signal of each charging pile; Step 2: Take valid data, when the collected data is enough, it is valid data; Step 3: Fit transition matrix; Step 4: Predict, use transition Matrix prediction; step 5: Taylor expansion, Taylor expansion of each charging pile signal obtained in step 4, to obtain multiple harmonics, the number of harmonics does not exceed 32 orders, step 6: judgment, the same number of charging piles with different serial numbers The order harmonics are accumulated to obtain the total harmonic, and the harmonic is compared with the preset required threshold of the charging pile. If the accumulated value is within the threshold requirement range, normal charging will continue. If the accumulated value exceeds the threshold requirement range, an alarm will be issued. The obvious effect of the invention is: to avoid risks in advance and improve safety.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a method for processing harmonic distortion of a power grid. Background technique [0002] The electric car is a kind of green transportation. The electric car is driven by electricity. Before the power of the battery is exhausted, the electric car needs to be charged with a special charging pile. The tram charging process uses a large current, which directly affects the power grid, which in turn affects the charging effect. Specifically, due to the large current in the charging process (more obvious in the fast charging process), harmonics will be generated in the power grid, causing power pollution, which in turn directly affects the charging effect. This situation is especially obvious when multiple charging piles are charging at the same time. [0003] A series of related studies have been carried out in the prior art. For example, CN201911151131.9 discloses a harm...

AI Technical Summary

Problems solved by technology

However, the actual situation is that the electric car charging standards of various manufacturers are not completely uniform. There is a big difference between fast charging and ordinary charging. With the use of the vehicle, the battery is repeatedly charged and discharged, and batteries with different aging degrees also have different performances when charging.

In particular, the extreme situation that may occur is that some aging batteries will break down during the fast charging process, and then cause combustion and explosion

In this case, relying solely on simple detection methods can no longer guarantee safety.

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