Separation source inverter decoupling control method based on synchronous reference coordinate system

Abstract

The invention relates to a separation source inverter decoupling control method based on a synchronous reference coordinate system. Double-loop voltage and current closed-loop control is adopted in the design of a direct-current loop controller; an outer loop is a direct-current voltage control loop, and due to the fact that the direct-current side contains an alternating-current component, a voltage loop inputs a direct-current side voltage direct-current component, and a given value of a current loop is output through PIv control; an inner loop is an input current control loop, the current iL is not affected by ripples by using a PI controller, and the direct-current side capacitor and the direct-current power supply are connected in parallel to play a role of a low-pass filter. The direct-current side and the alternating-current side are controlled separately, so that ripple waves at the direct-current side and current harmonic waves at the alternating-current side are suppressed.

Description

technical field [0001] The invention relates to an inverter control technology, in particular to a decoupling control method for a separate source inverter based on a synchronous reference coordinate system. Background technique [0002] The emergence of energy crisis, greenhouse effect and other issues has promoted the rapid development of new energy power generation technology, and new energy power generation technology has become a research hotspot. With the increasing proportion of new energy sources, the requirements for inverters are getting higher and higher. Grid-connected inverters have been widely used as the interface between distributed power generation and the grid. Since power electronic equipment cannot provide the required inertia and damping for the grid, with the continuous improvement of the penetration rate of distributed power generation, the power grid The inertia and damping are seriously insufficient, and the stability is reduced. Since the distribu...

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Problems solved by technology

[0004] The present invention is aimed at the problem of low current quality caused by the instability of distributed power generation, and proposes a decoupling method based on a separate source inverter in a synchronous reference coordinate system The control method, which can realize the separate control of the AC side and the DC side, and the common mode item of the AC modulation signal is used to adjust the DC side, so that there are two additional degrees of freedom for the control parameters, and the coupling degree of the input and output of the inverter is weakened. Then realize the suppression of input current and output current oscillation, improve the dynamic and static stability of the entire inverter system, and ensure its safe and reliable operation

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