V2G charger adopting high-frequency chain matrix converter and control method thereof

Abstract

The invention discloses a V2G charger adopting high-frequency chain matrix converter and a control method thereof. The V2G charger comprises a grid-side filter, a high-frequency chain matrix converter, a single-phase bridge-type full control rectifier, and a battery side filter, wherein the high-frequency chain matrix converter comprises a three phase-single phase AC / AC matrix converter and a high-frequency transformer T; and the grid-side filter, the three phase-single phase AC / AC matrix converter, the high-frequency transformer T, the single-phase bridge-type full control rectifier, and the battery side filter are sequentially connected. the V2G charger control method comprises steps of charging and feeding; and according to charging and feeding, outer loop switching control is adopted to generate an outer loop control quantity, the outer loop control quantity is subjected to inner loop decoupling control to obtain pulse signals, and the pulse signals are used for controlling the high-frequency chain matrix converter for realizing charging or feeding. The V2G charger adopting high-frequency chain matrix converter has the advantages of simplified structure, high conversion efficiency, small size and small weight, stable charging and feeding control, and good battery protection.

Description

technical field [0001] The invention relates to a V2G charger, in particular to a V2G charger using a high-frequency chain matrix converter and a control method thereof. Background technique [0002] V2G (Vehicle to Grid) charger is a charger for electric vehicles, which can realize the connection between electric vehicles and the grid. When the electric vehicle is not working, it can feed energy back to the grid. gain energy. The existing structure of V2G chargers can be divided into non-isolated type and isolated type: non-isolated type without transformer has high efficiency, but there are safety hazards caused by common mode voltage; isolated type is divided into industrial frequency transformer type and high frequency transformer type, industrial The high-frequency transformer type has a large volume and weight, and the cost is high, while the high-frequency transformer type has a small volume and weight, and can isolate and protect the circuit. In the high-frequency ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention: On the one hand, in view of the structural shortcomings of the current V2G charger, a V2G charger using a high-frequency chain matrix converter is provided. The link between the / AC matrix converter and the high-frequency transformer avoids the potential safety hazard caused by the common-mode voltage, simplifies the three-level structure into two, reduces the number of conversion stages and improves the conversion efficiency, and omits the DC bus energy storage components (such as The use of large capacitors) greatly reduces the volume and weight of the system

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