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A Harmonic Improvement Method for Inverter of Power Generation System

A power generation system and inverter technology, applied in the field of power electronics, to achieve the effects of improving life, improving total harmonic distortion, and reducing total harmonic distortion

Active Publication Date: 2020-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can reduce harmonics, but they are not aimed at improving the annual operating conditions of wind / photovoltaic inverters

Method used

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  • A Harmonic Improvement Method for Inverter of Power Generation System
  • A Harmonic Improvement Method for Inverter of Power Generation System
  • A Harmonic Improvement Method for Inverter of Power Generation System

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Embodiment Construction

[0030] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0031] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0032] THD (Total Harmonic Distortion): total harmonic distortion

[0033] 3L-NPC (Three-Level Neutral-Point-Clamped): Neutral point clamped three-level inverter

[0034] PWM (Pulse Width Modulation): pulse width modulation;

[0035] IGBT (Insulated Gate Bipolar Transistor): Insulated Gate Bipolar Transistor

[0036] figure 1 It is a flow chart of a specific embodiment of the harmonic improvement method for the inverter of the power gen...

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Abstract

The invention discloses a method for improving harmonics of an inverter in a power generation system. The wind speed / light energy is converted into the output power of the inverter, and then the output power is divided according to the change curve of the total harmonic distortion (THD) with the output power. For several power level intervals, each power level interval corresponds to a switching frequency so that the THD is lower than 5%. When the wind power / photovoltaic power generation system is in operation throughout the year, a corresponding switching frequency is used for the power level interval where the output power is located. , In this way, the changing switching frequency is adapted to the changing output power to achieve the purpose of improving harmonics.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a method for improving harmonics of an inverter of a power generation system. Background technique [0002] In order to reduce the waste of resources, protect non-renewable resources, and take the road of sustainable development, the penetration rate of new energy power generation systems in the power grid is getting higher and higher, and at the same time, the use of inverters in wind power / photovoltaic power generation systems is also increasing. Compared with two-level power inverters, multi-level inverters have shown their superiority in the field of high voltage levels. In current wind power / photovoltaic power generation systems, three-level inverters have gradually replaced two-level inverters. Transformer. However, this situation makes the power grid have stricter requirements on the quality of connected power, and the large fluctuations of wind ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02M1/12
CPCH02J3/01H02M1/12Y02E10/56Y02E10/76Y02E40/40
Inventor 张刚李凯黄静洋谢川邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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