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Method for accurately predicting output harmonic waves of single-phase voltage source type inverter

A single-phase voltage and inverter technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, harmonic reduction device, etc., can solve the requirements of accurate calculation and reverse harmonic The actual use of the compensation method can not achieve the expected effect, etc., to achieve the effect of improving the power quality and facilitating harmonic compensation

Pending Publication Date: 2022-04-29
武汉高仕达电气有限公司
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Problems solved by technology

[0003] However, because the existing inverter model and the calculation of output harmonics can only qualitatively analyze the content of each harmonic and cannot meet the requirements of accurate calculation, the actual use of the harmonic reverse compensation method is not effective. can not achieve the desired effect

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Embodiment Construction

[0050] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0051] Such as figure 1 and combine Figure 2 to Figure 10 As shown, a method for accurately predicting the output harmonics of a single-phase voltage source inverter, the method steps are:

[0052] Step 1: The inverter model is modulated and optimized to make it closer to reality;

[0053] Step 2: Analyze the modulation optimization process, and analyze the influence of digitization and dead zone effects on the output voltage from the time domain;

[0054] Step 3: use the double Fourier series to calculate the output harmonics in the frequency domain;

[0055] Step 4: Optimize the algorithm in combination with the current zero-crossing problem that may exist in the actual process, and finally obtain an algorithm that can accurately predict output harmonics.

[0056] The inverter modulation optimization ...

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Abstract

The invention discloses a method for accurately predicting output harmonic waves of a single-phase voltage source type inverter, which comprises the following steps of: modulating and optimizing an inverter model so that the inverter model is closer to reality; analyzing a modulation optimization process, and analyzing the influence of digitization and dead zone effects on output voltage from a time domain; calculating an output harmonic wave in a frequency domain by using double Fourier series; the algorithm is optimized in combination with the current zero-crossing problem existing in the actual process, and finally the algorithm capable of accurately predicting the output harmonic waves is obtained. The method has the beneficial effects that the specific amplitude and phase of the output voltage harmonic wave of the voltage source type inverter can be accurately calculated, so that the subsequent harmonic wave compensation is facilitated, and finally, the electric energy quality is improved; an inverter model closer to reality is established after the influence of two nonlinear factors of digitization and dead-zone effect on the output voltage is fully considered, and the specific amplitude and phase of each harmonic of the output voltage harmonic can be calculated.

Description

technical field [0001] The invention relates to the technical field of power electronic power devices, in particular to a method for accurately predicting output harmonics of a single-phase voltage source type inverter. Background technique [0002] In the past few decades, voltage source inverters have been widely used in industrial fields, such as motor drives, frequency converters, flexible power transmission and grid-connected systems of renewable energy. However, due to the use of digital controllers and the dead zone effect of the inverter structure itself, the output harmonics are affected by both nonlinear factors and become more complicated. In order to better suppress harmonics and improve the quality of output power, scholars at home and abroad have conducted a lot of research on harmonic suppression methods. They can be roughly divided into three categories: the use of controllers, the design of filters, and back-compensation based on accurate harmonic calculati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/38H02J3/38H02J3/01
CPCH02M7/53873H02M1/38H02J3/381H02J3/01Y02E40/40
Inventor 张智雄
Owner 武汉高仕达电气有限公司
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