Control method and control system of single-phase inverter

Abstract

The invention relates to a control method and a control system of a single-phase inverter. The control method comprises the following steps of: detecting the inverted inductive current to be used for inverted progressive limiting current by using two primary current transducers (CT); calculating the capacitance current by using a difference method, and indirectly calculating the load current according to a formula to be used for calculating load power; meanwhile, using the calculated capacitance current as the negative feedback of a current ring to realize two closed loop control of inverted voltage and capacitance current. Current detection can be completed by using a single current transducer, and the instantaneous value control and the load capacity calculation of the inverted voltage and the capacitance current under a single CT hardware circuit can be realized on software; thus, hardware cost is saved.

Description

technical field The present invention relates to power supply technology, more specifically, to a control method and control system for a single-phase inverter. Background technique The traditional single-phase inverter adopts double closed-loop control of voltage and current, and its algorithm needs to detect the inverter inductor current and load current. The inverter inductor current is used for negative feedback of the current inner loop and hardware wave-by-wave current limiting, and the load current is used to calculate the load of the inverter and do the feedforward of the current inner loop, so two current sensors are required on the hardware, as shown in Figure 1 As shown, the first current sensor CT1 is used to detect the inductor current, and the second current sensor CT2 is used to detect the load current. Figure 2 is a block diagram of a traditional single-phase inverter control system. i in Figure 2 L (s) is the inductor current, i O (s) is the load curren...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to provide a control method for a single-phase inverter that uses only one current sensor for current detection in view of the above-mentioned defects of large number of hardware and high cost in the prior art

Images