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Frequency conversion control method of grid-connected inverter and grid-connected inverter system

A frequency conversion control and inverter technology, applied in the field of smart grid, can solve the problem of high volume and cost of inverter inductance

Active Publication Date: 2021-03-26
SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a frequency conversion control method for grid-connected inverters and a grid-connected inverter system for the problem of high cost caused by the large volume of inverter inductors in the traditional grid-connected inverter control method.

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  • Frequency conversion control method of grid-connected inverter and grid-connected inverter system
  • Frequency conversion control method of grid-connected inverter and grid-connected inverter system
  • Frequency conversion control method of grid-connected inverter and grid-connected inverter system

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[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0035] The present application provides a frequency conversion control method for a grid-connected inverter. It should be noted that the frequency conversion control method of the grid-connected inverter provided in the present application is applied to the grid-connected inverter system, and is specifically applied to the control of the grid-connected inverter in the grid-connected inverter system. The grid-connected inverter is a device that converts the direct current generated by photovoltaic modules into alternating current and transmits it to the grid side. Grid-con...

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Abstract

The invention relates to a frequency conversion control method of a grid-connected inverter and a grid-connected inverter system, numerical range division is carried out on output current of an inverter unit according to harmonic test requirements of specific laws and regulations, and when the output current of the inverter is large, PWM switching frequency works at low frequency; when the outputcurrent of the inverter is small, the PWM switching frequency works at a high frequency, so that the ratio of the peak value of the ripple peak of the output current to the effective value of the output current is reduced, the harmonic quantity of the output current is small, the requirement on the inductance value of the output inductor of the inverter under the condition of small output currentcan be obviously reduced, the inductor size can be reduced, and the product cost is reduced; and product miniaturization design is faciliated.

Description

technical field [0001] The present application relates to the technical field of smart grid, in particular to a frequency conversion control method of a grid-connected inverter and a grid-connected inverter system. Background technique [0002] In the current grid-connected inverter design, pulse width modulation technology (PWM technology) is used for inverter control, and the inverter current is controlled by changing the pulse width duty cycle. When the output power of the inverter is large, the ratio of the peak-to-peak value of the output current ripple to the effective value of the output current is small, so the total harmonics of the current at this time are small. When the output power of the inverter is small, the ratio of the peak-to-peak value of the output current ripple to the effective value of the output current is relatively large, so the amount of current harmonics at this time will be relatively large, and it is difficult to pass the current harmonic requi...

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Application Information

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IPC IPC(8): H02M7/537H02J3/38
CPCH02J3/381H02M7/537H02J2300/26Y02E10/56
Inventor 施鑫淼郭华为刘超厚李新富祝东敏
Owner SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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