Common-mode interference suppression circuit for three-phase EMI filter

Abstract

The invention discloses a common-mode interference suppression circuit for a three-phase EMI filter. The common-mode interference suppression circuit comprises an EMI filter body, wherein the EMI filter body comprises an adjustable resistor, an iron core, and a first primary side coil, a second primary side coil, a third primary side coil, a fourth primary side coil and a secondary side coil which are wound around the iron core; the first primary side coil, the second primary side coil and the third primary side coil are connected with an A phase line, a B phase line and a C phase line of the three phase lines respectively; the fourth primary side coil is connected with a neutral line; and the secondary side coil is connected with the adjustable resistor in series. The common-mode interference suppression circuit can well solve the common-mode interference problem.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic immunity and relates to a common-mode interference suppression circuit of a three-phase EMI filter. Background technique [0002] As the requirements for environmental protection become more and more stringent and the demand for clean energy continues to increase, my country is vigorously promoting photovoltaic power generation systems to convert the unstable DC power generated by the panels into stable AC power that can be connected to the grid. Grid-connected inverters play a key role in photovoltaic power generation systems. [0003] In a large-scale photovoltaic power station, the electromagnetic interference generated by the three-phase grid-connected inverter causes great interference to the inverter itself and its communication with the background monitoring and combiner box, causing interruption of driving, control and other signals, and data distortion. As a result, the bit error ...

AI Technical Summary

Problems solved by technology

[0003] In a large-scale photovoltaic power station, the electromagnetic interference generated by the three-phase grid-connected inverter causes great interference to the inverter itself and its communication with the background monitoring and combiner box, causing interruption of driving, control and other signals, and data distortion. As a result, the bit error rate increases, and the commands cannot be executed in time or correctly, which seriously affects the normal monitoring and safe operation of the power station. As one of the main types of electromagnetic interference, common mode interference can effectively suppress the electromagnetic interference generated by the inverter

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