Control method for single-phase off-network inverter power supply

Abstract

The invention discloses a method for controlling a single-phase off-grid inverter power supply. The single-phase off-grid inverter power supply at least includes a DC power supply outputting direct current, a push-pull boost module, an uncontrolled rectification module, and a single-phase inverter The DC power output terminal is connected to the input terminal of the push-pull boost module, the push-pull boost module is connected to the uncontrolled rectifier module, and the uncontrolled rectifier module is connected to the The single-phase inverter network is connected, and the central controller is respectively connected to the single-phase inverter controller network. The single-phase off-grid inverter power supply of the present invention includes soft-start state control and normal operation state control, and Collect the high-voltage DC voltage signal output by the uncontrolled rectifier module and the AC voltage and current signal output by the single-phase inverter controller and output the SPWM signal to control the control method. The control method of the present invention can effectively realize the current inner loop without steady-state error Tracking control and reducing the impact of inrush current on the power supply.

Description

technical field [0001] The invention relates to a power supply and an off-grid inverter control technology, in particular to a control method for a single-phase off-grid inverter power supply. Background technique [0002] With the continuous advancement of science and technology, the demand for energy is increasing and the requirements are getting higher and higher. As a clean and convenient energy, electric energy is widely used all over the world. However, in the process of electric energy transmission, failures are often caused by various reasons, which makes it particularly important to use the electric energy of the equipment when repairing the line. The use of portable mobile power can effectively solve this situation, making the line Maintenance is easier. In the past, when performing line maintenance, diesel or gasoline generators were often used to provide power to the maintenance equipment. However, due to the large size and weight of the generator, it is not eas...

AI Technical Summary

Problems solved by technology

In the past, when performing line maintenance, diesel or gasoline generators were often used to provide power to the maintenance equipment. However, due to the large size and weight of the generator, it is not easy to carry, which brings inconvenience to the maintenance work of the power grid and reduces the power supply. The size and weight of the equipment is an urgent problem to be solved by the power grid company. Therefore, it is very necessary to develop a portable mobile power supply that can replace the generator

However, in traditional single-phase off-grid inverters, the average value or instantaneous value of voltage output is generally used for feedback control. However, the average value control of voltage output will lead to slow response speed, and the output voltage cannot be adjusted due to load changes. Give the system correct feedback when jumping; and instantaneous value control does not have this problem, but its steady-state performance is not good. During line maintenance, the power supply to the maintenance equipment must be a stable and anti-interference power supply. The stability of the inverter control and the ability to resist shock loads are very important

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