Photovoltaic inverter inductance compensation control method

Abstract

The invention relates to a photovoltaic inverter inductance compensation control method. A transfer function is adjusted correspondingly through change of hardware nonlinear inductance and current to achieve nonlinear characteristic inductance compensation control. The current nonlinear inductance is adopted, inductance cost is reduced, size is compressed, system noise and power consumption are reduced, grid connection stability and reliability of a photovoltaic inverter are improved, and system power generation efficiency is improved. The method solves the problem of difficulty of the nonlinear characteristic inductance in an inverter control strategy, and the technical scheme can be applied to power electronic topological circuits of wind power inverters, uninterruptible power supplies (UPS) and the like.

Description

technical field [0001] The invention relates to a control method for a photovoltaic inverter, in particular to a compensation control method for the inductance of a photovoltaic inverter. Background technique [0002] Human beings are facing two major problems of energy and environment, and the development of renewable, clean and non-polluting alternative energy has become a top priority. Due to its own advantages, solar energy has attracted more and more people's attention, and has become a research hotspot all over the world. [0003] The advantages of solar energy are: the energy is huge, and there is a lot of room for utilization; the environment does not produce pollution, and it is a kind of clean energy; Concerned about the depletion of solar energy; ubiquitous and does not need to be mined and transported. [0004] At present, the overall power generation efficiency of the solar power generation system is mainly related to the solar cell efficiency, inverter effici...

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Problems solved by technology

[0009] (1) The low-frequency DC loss of the RMS current flowing through the DC internal resistance;

[0010] (2) High-frequency AC loss caused by the skin effect of the wire caused by the high-frequency AC component;

[0011] (3) Proximity effect high-frequency loss caused by high-frequency current skin effect between winding layers;

[0012] (4) The eddy current loss formed by the air gap leakage through the conductor

[0035] As mentioned above, many current inverter products try to increase the filter inductance as much as possible, and try to keep the inductance at a fixed value so that it does not change with the current. When solving the closed-loop parameter mismatch of the control system, it is easy Oscillation of the system occurs, poor high-order harmonics appear, and distortion of the current waveform is often accompanied by relatively large audio noise. The disadvantage is that the cost of the inductor is greatly increased. Due to the amorphous characteristics, it will bring Noise and power loss and other issues, while increasing the system size, does not meet the current high-efficiency and optimal design

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