Bootstrap compensation three-port converter and control method and system thereof

Abstract

The invention provides a bootstrap compensation three-port converter and a control method and system thereof, and belongs to the technical field of power electronic converters. The converter comprises a grid-side rectification circuit, a series compensation side inversion circuit and a transformer; a first winding in the transformer is a primary winding, and a second winding and a third winding are secondary windings; the dotted terminal of each phase of winding of the first winding is connected with each phase of line of a power grid, and the synonym terminal of each phase of winding is used as each phase port of the primary winding; the dotted terminal of the second winding is connected to serve as a transformer secondary side neutral point and serves as a terminal connected with a direct-current low-voltage port; each phase winding dotted terminal of the third winding is used as each phase port of the secondary winding of the transformer; and the second winding and the third winding are in zigzag connection. The operation stability of the converter is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and more particularly, relates to a three-port converter with bootstrap compensation and a control method and system thereof. Background technique [0002] With the development of economy and society, people's demand for energy is constantly increasing, and the development and extensive use of new energy has become a hotspot in the development of power grid energy. New energy power generation is usually affected by the environment and has intermittent and fluctuating effects, and the power regulation role of energy storage systems has become particularly prominent. At the same time, the large-scale distributed energy construction network results in small short-circuit capacity and low short-circuit ratio of the power grid, and the node voltage is easily affected by the line current, which in turn reduces the stability of the distributed energy inverter. In order to solve the ...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a three-port converter with bootstrap compensation and its control method and system, aiming at solving the bidirectional DC-DC-AC conversion of the existing three-port H-bridge The two inductors connected to the low-voltage port of the DC side of the inverter pass the AC current with opposite phases, resulting in additional power loss of the switch tube, high heat generation, and low safety; at the same time, most grid-connected inverters use phase-locked loop-based The direct voltage control method has high requirements on the stability of the sampling voltage, and the existing converter topology control is difficult to deal with the problem of weak power grids with low short-circuit ratio

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