Port power decoupling control method for three-port dc/dc converter

Abstract

The invention discloses a port power decoupling control method of a three-port DC / DC converter. The three-port DC / DC converter comprises three single-phase H-bridge inverted units and a three-windingtransformer, direct-current ports of the inverted units are connected with a direct-current bus, and alternating-current ports of the inverted units are connected with corresponding ports of the three-winding transformer. A control system increases the dynamic response speed of a multiport converter system by stacking a feedforward command signal of a phase shifting angle corresponding to a port rated power value; through feedforward decoupling links, loop interaction of different ports is removed, and the control performance of the system is improved; through power circulating-current inhibition and control, the whole system loss is reduced to the greatest extent, and the zero circulation power in the converter is guaranteed.

Description

technical field [0001] The invention relates to a three-port DC / DC converter, in particular to a port power decoupling control method of the three-port DC / DC converter. Background technique [0002] In recent years, the demand for multifunctional energy management systems and energy storage components capable of harvesting energy from a variety of sustainable or conventional energy sources has been increasing, especially in electric vehicles, renewable energy generation systems and uninterruptible power supplies. . In order to realize the compatibility of DC voltages of various voltage levels in complex electrical systems, DC energy conversion will be inevitable. However, in DC energy conversion, it is difficult to realize voltage conversion through the principle of electromagnetic induction in AC systems, and it is necessary to realize voltage conversion and power transfer through power converters based on power electronics technology. [0003] In the early systems of ele...

AI Technical Summary

Problems solved by technology

[0006] (1) The speed near the steady-state operating point of the multi-port DC / DC converter under simple feedback control is relatively slow;

[0007] (2) The number of ports of the multi-port DC / DC converter is large and there is coupling between different ports. Only controlling the phase shift angle to control the coupling power of different ports is easy to generate circulating power inside the three-winding transformer;

[0008] (3) The parameter coupling of different ports of the multi-port DC / DC converter is relatively complicated. The coupling relationship between different ports is ignored and only the relationship between the parameters of a single port is controlled. The control outputs of different ports will interact with each other, reducing the dynamics of the multi-port conversion system. Performance, system control speed and accuracy, etc., all have certain deficiencies.

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