Online monitoring modulation strategy of three-level NPC inverter

An inverter and three-level technology, applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problem that the inverter cannot be monitored and the monitoring strategy does not have options Sexuality, inability to completely eliminate the impact and other issues, to achieve a selective effect

Active Publication Date: 2021-09-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1) The adaptability of the monitoring method and the system under test is not considered;
[0008] 2) The existing online monitoring modulation strategy can only find a certain monitoring start time, so that the monitoring has the least impact on the normal operation of the inverter, but it cannot completely eliminate the impact;
[0009] 3) The monitoring duration in the existing online monitoring modulation strategy is a fixed value determined artificially, which cannot be determined according to the operating status of the inverter, and the monitoring strategy is not optional

Method used

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  • Online monitoring modulation strategy of three-level NPC inverter
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  • Online monitoring modulation strategy of three-level NPC inverter

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] figure 1 It is a topological diagram of a three-level NPC inverter in an embodiment of the present invention. Depend on figure 1It can be seen that the three-level NPC inverter includes a DC-side power supply E, two identical DC-side capacitors, a three-phase inverter main circuit, a three-phase load resistor and a three-phase load inductance. The voltage at the DC side power supply E is recorded as the DC side voltage U dc , and the two DC-side capacitors are denoted as DC-side capacitors C H and DC side capacitance C L , the DC side capacitor C H It is connected in series with the DC side capacitor CL and connected in parallel between the DC positive bus P and the DC negative bus N of the DC side power supply E, and the DC side capacitor C H and DC side capacitance C L The connection point of is marked as neutral point Y.

[0047] The three-phase inver...

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Abstract

The invention discloses an online monitoring modulation strategy of a three-level NPC inverter, and belongs to the field of inverter control. According to the on-line monitoring modulation strategy, the on-line monitoring process can be manually adjusted according to the operation condition of a to-be-monitored inverter, the monitoring starting moment and the monitoring duration are controllable, and the unicity of an existing on-line monitoring method is overcome. Besides, the on-line monitoring modulation strategy provided by the invention does not have any influence on the load current electric energy quality of the to-be-monitored inverter, so that the to-be-monitored inverter can be monitored at any time when the inverter works on line. The strategy is simple in principle and convenient to implement.

Description

Technical field: [0001] The invention relates to a modulation strategy of a three-level NPC inverter, in particular to a modulation wave reconstruction strategy during online monitoring of a three-level NPC inverter, and belongs to the field of inverter control. Background technique: [0002] Compared with the two-level inverter, the three-level inverter has the advantages of small output voltage and current harmonics, and the voltage and switching loss of the switching device are halved, which can effectively reduce the size and size of passive components such as filters. weight. Therefore, three-level NPC inverters have gradually moved from high-power medium-voltage applications to low-voltage photovoltaic, wind power and energy storage grid-connected inverter systems. However, with the increase in the number of switching devices and the increase in system power, the reliability of the inverter system is facing challenges. IGBT has the advantages of fast switching speed,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/5387H02M7/5395
CPCH02M7/487H02M7/53871H02M7/5395Y02E10/56
Inventor 马铭遥孟娜陈兆祥王涵宇李飞
Owner HEFEI UNIV OF TECH
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