Bidirectional energy storage converter and control method thereof

Abstract

The invention discloses a bidirectional energy storage converter and a control method thereof. The converter comprises a storage battery, a bidirectional DCDC conversion circuit, a bidirectional DCACcircuit, a filter circuit and a control circuit; the storage battery is connected with the bidirectional DCDC conversion circuit; the bidirectional DCDC conversion circuit is connected with the bidirectional DCAC circuit; the bidirectional DCAC circuit is connected with the filter circuit; the filter circuit is connected with a power grid and a load through a gating switch; and the output end of the control circuit outputs a control signal to the bidirectional DCDC conversion circuit, the bidirectional DCAC circuit and the gating switch. The bidirectional energy storage converter has the advantages that a bidirectional energy storage inverter can realize off-grid operation and grid-connected operation; an alternating current power supply can be provided for the load by boosting and inverting when the power grid is powered off; and when the power grid works, the storage battery is charged through the power grid to supplement electric energy, so that the power-off work of load equipmentis realized.

Description

technical field [0001] The invention relates to the field of power supply control, in particular to a control method for a bidirectional energy storage converter. Background technique [0002] With the development of power electronics technology and the gradual changes in the world's energy structure, new energy products have gradually entered people's lives and changed people's lives, among which energy storage converters play an increasingly important role in practical applications. The emergence of energy storage converters solves many difficulties in people's lives, and provides power support for some special equipment in the event of a power outage. Currently, three-phase energy storage converters are commonly used in the market, mainly for Industrial equipment applications and daily civilian equipment mostly use single-phase power supply. Although there are researches on single-phase energy storage converters in the market, they only stay in theoretical research and do...

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Problems solved by technology

[0002] With the development of power electronics technology and the gradual changes in the world's energy structure, new energy products have gradually entered people's lives and changed people's lives, among which energy storage converters play an increasingly important role in practical applications. The emergence of energy storage converters solves many difficulties in people's lives, and provides power support for some special equipment in the event of a power outage. Currently, three-phase energy storage converters are commonly used in the market, mainly for Industrial equipment applications and daily civilian equipment mostly use single-phase power supply. Although there are researches on single-phase energy storage converters in the market, they only stay in theoretical research and do not consider the marketability of products. This paper proposes a suitable For energy storage converters in single-phase systems, the buck-boost bidirectional DCDC control strategy is used to reduce the number of batteries on the DC side, enabling off-grid and grid-connected operation. Electric energy, when the power grid comes in, the equipment can run in parallel with the grid to charge the battery

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