Photovoltaic inverter inductance compensation control method based on space vector pulse width modulation (SVPWM)

Abstract

The invention provides a photovoltaic inverter inductance compensation control method based on space vector pulse width modulation (SVPWM). Matching is conducted by measuring the values of the inductance of a system on the DC / AC side and varying with grid connection current to build a variation curve of the inductance varying with the grid connection current, an inverter is adjusted according to the actual current and the value of the inductance obtained through the matching curve to correspondingly control the function transfer relation, the output quantity is adjusted through inversion control, and non-ideal characteristic inductance compensation is achieved. A high-efficiency stable and economical control system of the inverter is achieved. By means of the method, the non-ideal characteristic inductance control strategy which cannot be controlled singly due to the inversion control strategy is improved, and non-ideal characteristic inductance inversion control is achieved under the SVPWM control strategy.

Description

technical field [0001] The invention relates to an inductance compensation control method of a photovoltaic inverter, in particular to a SVPWM-based inductance compensation control method of a photovoltaic inverter inductance. Background technique [0002] Photovoltaic power generation technology is a very important technology in the field of photovoltaic applications. It has many advantages such as cleanness, safety, long life and low maintenance. It is considered to be the most important and most dynamic new energy in the 21st century. Among them, the photovoltaic grid-connected power generation market centered on photovoltaic integrated buildings has surpassed off-grid applications, with a growth rate of more than 40% in recent years, becoming the most important engine of the world's photovoltaic industry. Photovoltaic grid-connected power generation has become the latest highlight in the research and development of photovoltaic power generation. [0003] Solar photovolt...

AI Technical Summary

Problems solved by technology

[0012] 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

[0013] On the other hand, for the SVPWM (Space Vector Pulse Width Modulation) control system, the collected three-phase current is converted into the quantity in the DQ rotating coordinate system. For control, the SVPWM control cannot Realize separate control of each phase, therefore, it is impossible to adjust the system transfer function by converting the instantaneous value of the current into the inductance value, and realize the stable control of the system

Images