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

A common-mode interference and suppression circuit technology, applied in electrical components, output power conversion devices, etc., can solve problems such as interference, increase in bit error rate, and affect the normal monitoring and safe operation of power plants, so as to suppress common-mode interference and improve The effect of inhibiting ability

Inactive Publication Date: 2016-07-06
XIAN XJ POWER ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0012] The present invention is described in further detail below in conjunction with accompanying drawing:

[0013] refer to figure 1 The common-mode interference suppression circuit of the three-phase EMI filter of the present invention includes an EMI filter body, and the EMI filter body includes an adjustable resistor 6, an iron core, and the first primary side coil 1 wound on the iron core, the first The second primary coil 2, the third primary coil 3, the fourth primary coil 4, and the secondary coil 5; the first primary coil 1, the second primary coil 2, and the third primary coil 3 are respectively connected to the three-phase line The A-phase line, B-phase line and C-phase line are connected, the fourth primary coil 4 is connected with the neutral line; the secondary coil 5 is connected with the adjustable resistor 6 in series.

[0014] The principle of transformer impedance transformation is as follows. The equivalent total impedance of the primary side of the trans...

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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 ...

Claims

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Application Information

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IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 董晓帅孟向军谢剑郎学斌徐关澄吕淼牛化鹏张海龙姚为正
Owner XIAN XJ POWER ELECTRONICS TECH
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