A method for tradeoff between inverter loss and switching frequency

A switching frequency, inverter technology, applied in output power conversion devices, high-efficiency power electronic conversion, single-grid parallel feeding arrangements, etc., to avoid increased switching losses, prolong service life, and be less prone to grid voltage distortion.

Inactive Publication Date: 2019-01-11
珠海汇众能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] How to choose a suitable switching frequency to maximize the economic efficiency, there is no relevant research at present, this invention proposes a method to optimize the switching frequency of the inverter

Method used

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  • A method for tradeoff between inverter loss and switching frequency

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Embodiment 1

[0027] see Picture 1-1 , a method for compromising inverter loss and switching frequency, comprising the following steps:

[0028] Step 1. Get the switching frequency range (fmin, fmax) of the devices used in the inverter, where fmin is the minimum switching frequency that the switching devices of the inverter can work. If the device manual does not provide the minimum switching frequency, it can be considered the lowest The switching frequency is 0Hz, and fmax is the highest switching frequency that the inverter switching device can withstand, which can be converted to 1 per unit;

[0029] Step 2. Model the switching frequency affecting the loss of the inverter to obtain the function F1(f), where f is the switching frequency of the inverter. Generally speaking, the greater the switching frequency f of the inverter, the loss function F1 also bigger;

[0030] Step 3: Model the effect of the switching frequency on the inverter and the load working with it, and obtain the func...

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Abstract

The invention discloses a method for compromising inverter loss and switching frequency, belonging to the technical field of inverter loss and switching frequency. The method for compromising inverterloss and switching frequency comprises the following steps: (1) obtaining the switching frequency range (fmin, fmax) of the device used in the inverter; 2, model that loss of the invert influenced bythe switching frequency to obtain a function F1 (f); 3, model that inverter affect by the switching frequency and the load working with the inverter to obtain a function F2 (f); 4, define a total efficiency function F (f) = F1 (f) * (1-F2 (f)); 5, obtain that minimum value Fmin by F and carrying the total efficiency function F (f) = F1 (f) * (1-F2 (f)) in the step 4 for calculation; 6, obtain that f0 from the step 5, f0 is the optimal switching frequency, and the optimal switch frequency can be obtained and selected, thereby achieving the optimal economic efficiency.

Description

technical field [0001] The present invention relates to the technical field of inverter loss and switching frequency, and more specifically, relates to a compromise method between inverter loss and switching frequency. Background technique [0002] An inverter is a device that converts direct current into alternating current, and is commonly used in uninterruptible power supply UPS, photovoltaic power generation, wind power generation, etc. During the operation of the inverter, if the switching frequency F is too high, it will cause the switching loss of the inverter to increase, which will indirectly increase the loss of the user; on the other hand, if the switching frequency is too low, it will cause the grid voltage Distortion affects the power quality of the inverter and affects the service life of the load working with the inverter. [0003] In addition, the switching frequency of the inverter is also determined by the operating frequency range of the selected switchin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M1/00
CPCH02J3/381H02M1/00H02J2203/20H02M1/0054Y02B70/10
Inventor 张亮
Owner 珠海汇众能源科技有限公司
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