Converter switching frequency control method and system

A converter switch and switching frequency technology, which is applied in the direction of output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of cumbersome improvement methods for converter harmonics

Active Publication Date: 2020-03-31
XUJI GRP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a converter switching frequency control method and control system to solve the problem that the existing harmonic improvement method in the converter is complicated

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  • Converter switching frequency control method and system
  • Converter switching frequency control method and system
  • Converter switching frequency control method and system

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Embodiment Construction

[0022] Embodiment of converter switching frequency control method

[0023] In order to facilitate the description of the converter switching frequency control method, this embodiment provides a grid system, including a converter, one end of the converter is connected to the grid, and the other end is connected to corresponding equipment (such as wind power generators, photovoltaic modules or storage energy system). Such as figure 1 As shown, it is a typical distributed system topology. The wind generator is connected to the grid through the wind power inverter (wind power converter), and the photovoltaic module is connected to the grid through the photovoltaic inverter (ie photovoltaic converter). The energy storage system is connected to the grid through the energy storage converter.

[0024] The converter in the power grid system is controlled by the converter switching frequency control method, and the control of the converter is realized through the control method. The ...

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Abstract

The invention relates to a converter switching frequency control method and system, and the method comprises the steps: firstly detecting actual harmonic content of a converter, then comparing the actual harmonic content with a set content threshold value, and controlling to improve the switching frequency of the converter when the actual harmonic content is greater than the set content thresholdvalue and the converter is in a seven-segment control mode; and when the actual harmonic content is less than or equal to the set content threshold and the switching frequency of the converter is greater than the minimum allowable switching frequency, controlling to reduce the switching frequency of the converter. When grid-connected stable operation of the converter can be ensured, according to the change condition of the harmonic content output by the grid-connected point, the working mode and the switching frequency of a switching device of the converter are correspondingly controlled and changed, it is guaranteed that the converter has small harmonic content within the full-power output range, low-harmonic and high-efficiency operation within the full-power interval of the converter isachieved, and the working efficiency of the converter is improved.

Description

technical field [0001] The invention relates to a method and a control system for controlling the switching frequency of a converter. Background technique [0002] With the rapid development of new energy technologies such as photovoltaics and wind power, their grid-connected capacity is increasing. However, new energy sources such as photovoltaics and wind power have large randomness, and the output power is not stable. However, new energy sources such as photovoltaics and wind power need to be inverted through power electronic converters when they are connected to the grid, resulting in large fluctuations in the output power of power electronic converters. On the one hand, there are certain requirements for the output power range of the power electronic converter; on the other hand, there are higher requirements for the working efficiency and THD (harmonic distortion) of the power electronic converter in the full power range. However, the current mainstream converter met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
CPCH02M1/12H02M1/0048Y02B70/10
Inventor 邓超然李瑞生郭宝甫王卫星徐军王鹏田盈谢青松苑军军张鹏岳帅王小凯陈玉玺李亚辉王法宁
Owner XUJI GRP
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