LCL-type inverter decoupling control method based on state feedback

Abstract

The invention relates to an LCL-type inverter decoupling control method based on state feedback. The method comprises the following steps of: S1, setting an active component and a reactive component of a net current given value i2, acquiring a monitoring parameter in real time, and obtaining the active component and the reactive component corresponding to the monitoring parameter, wherein the monitoring parameter comprises the net current given value i2, actual voltage values u<c> of the two ends of a capacitor, an actual current value i1 passing through a first inductor and a network voltage e; S2, respectively acquiring an active component and a reactive component of a grid-connected inverter output voltage given value through the state feedback and closed-loop control of the monitoring parameter according to the active component and the reactive component of the net work current given value I2; and S3, carrying out pulse width modulation (PWM) control according to the active component and the reactive component of the grid-connected inverter output voltage given value, and controlling a grid-connected inverter through an output switch-controlled PWM wave. Compared with the prior art, the LCL-type inverter decoupling control method based on state feedback has the advantages that independent control of the active component and the reactive component is achieved, and high output current quality is also guaranteed.

Description

Technical field [0001] The invention relates to the field of inverter control, in particular to a decoupling control method of an LCL type inverter based on state feedback. Background technique [0002] The rapid development of new energy power generation technology has made grid-connected inverter technology a research focus. As a key part of the grid-connected inverter system, the grid-connected inverter usually uses pulse width modulation (PWM), and its output current contains high-order harmonics, which cannot meet the grid-connected requirements. Therefore, a filter needs to be connected between its output and the grid, and two types of filters, L-type and LCL-type, are commonly used. Compared with the L-type filter, the LCL filter has a more ideal high-frequency filtering effect, and the volume and loss are smaller than the L-type filter with the same filtering effect. How to improve the performance of LCL grid-connected inverters by improving control strategies has attra...

AI Technical Summary

Problems solved by technology

However, when the control method under the synchronous coordinate system is adopted, the coupling problem between the dq components brought about by the coordinate transformation is not considered in this patent

Images