Non-isolation type three-phase three-level V2G charge-discharge topological structure and control method therefor

Abstract

The invention discloses a non-isolation type three-phase three-level V2G charge-discharge topological structure. The non-isolation type three-phase three-level V2G charge-discharge topological structure comprises a main circuit module and a control circuit module, wherein the main circuit module comprises three parts in cascading manner, including a DC/DC part, an H bridge balance circuit and a DC/AC part; a vehicle-mounted power battery is connected to a direct current positive bus and a direct current negative bus through a bidirectional half-bridge converter; the H bridge balance circuit and two voltage-division capacitors C1 and C2 are arranged between the direct current positive bus and the direct current negative bus, and the direct current positive bus and the direct current negative bus are connected with the output end of the bidirectional half-bridge converter in parallel; the direct current buses are connected with a diode clamping type three-level PWM converter; a three-phase alternating current power supply live wire is connected to connecting places of upper and lower bridge arms of each phase of the bridge arms through a three-phase LC filter; the direct current buses are positioned in the H bridge balance circuit; according to the H bridge balance circuit, an IGBT switch tube Tb1 is in anti-parallel connection with a rapid recovery diode, or the switch tube Tb1 with an in-vivo parasitic diode is connected with a one-way conducive free-wheeling diode Db1 in series to form one side bridge arm, and a balance inductor Lb1 is connected in the middle thereof; the other end of the balance inductor is connected to a direct current side middle point; the bridge arms on the two sides are connected with a shared negative electrode and a shared positive electrode; and namely, the upper ends of the bridge arms are both connected to the direct current positive bus while the lower ends of the bridge arms are both connected to the direct current negative bus.

Description

technical field [0001] The invention belongs to the technical field of power electronics applications, and in particular relates to a non-isolated three-phase three-level V2G charging and discharging topology structure and a control method thereof. Specifically, it is a non-isolated V2G system topology and control method that is suitable for energy interaction between distributed power sources and AC power grids under modern power conversion technology, and meets the needs of common-mode voltage suppression and midpoint potential balance coordinated control. Background technique [0002] Facing the increasingly severe energy crisis, it has become the general trend to promote the development of the electric vehicle industry and realize the two-way energy interaction (Vehicle-to-Grid, V2G) between vehicles and power grids. At present, the development of V2G technology tends to be integrated. BYD's two-way inverter charging and discharging technology has revolutionized various...

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Problems solved by technology

On the other hand, the positive and negative small vectors participate in the synthesis of the reference vector at the same time, which will cause the system output common-mode voltage to have a large amplitude. method

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