Inverter output impedance detection device and method, and inverter operation control method

Abstract

The invention discloses an inverter output impedance detection device and method and an inverter operation control method, and provides a novel inverter output impedance detection scheme on the premise of verifying the feasibility of calculating the inverter output impedance through inverter side filter capacitor voltage and filter inductor current. The method comprises the following steps: inputting the sampled inverter side filter capacitor voltage and filter inductor current into a neural network model to predict output impedance of an inverter, and providing establishment and training steps of the neural network model; downloading the neural network model into an intelligent chip, and enabling the CPU to modulate a pulse signal through an adaptive algorithm according to a real-time detection result output by the intelligent chip so as to realize real-time control of the operation state of the inverter. According to the inverter output impedance detection device, a voltage source or a current source does not need to be used as a disturbance quantity, a frequency response analyzer is not needed, the output impedance of the inverter can be accurately predicted in real time through the deep neural network model, and self-adaptive control over the inverter is achieved.

Description

Technical field [0001] The present invention relates to an inverter, and more particularly relates to an inverter output impedance detection device and method, a control method for inverter operation. Background technique [0002] In the "carbon neutral", "carbon peak" target countries in the world, including new energy installed capacity increment photovoltaics, wind power and energy storage, including a sharp rise year by year, but the rising penetration of new energy in reducing carbon emissions but also caused a decline in the strength of the grid, commonly called low intensity power grid is weak grids. [0003] Weak grid will result in instability of the new energy inverters, to the safe and stable operation of the power system has brought great challenges. Stability Analysis current impedance analysis is widely used in the inverter, the inverter is calculated by the output impedance of the grid impedance, based on the stability of the system and is designed to change the al...

AI Technical Summary

Problems solved by technology

[0006] First, in industrial applications, it is difficult to detect the output impedance of the actual working condition of the inverter in real time, because it is impractical to apply a disturbance signal in real time in the actual working condition or to use many instruments in the laboratory to detect the working condition;

[0007] Second, the real-time detection value of the inverter output impedance is not clear at present, which leads to no motivation for those skilled in the art to study the detection technology of the inverter output impedance

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