DC bus bar connection construction for large power three-phase inverter

Abstract

The invention relates to a direct-current bus connection structure of a three-phase high-power inverter. In order to solve the problems that the grouping installation of capacitors is not considered in the prior three-phase high-power inverter and the ripple current between the capacitors is reduced, the invention provides a direct-current bus connection structure of the three-phase high-power inverter, which comprises a direct-current power supply, at least two capacitor modules and an inverted switching tube module, wherein the capacitor modules are connected with the inverted switching tube module in parallel, lapped copper bars with vertical laminated structures are arranged between the two adjacent capacitor modules and connected in parallel, and the capacitor modules are connected with the direct-current power supply after being connected with the inverted switching tube module in parallel. By adopting the connection, all the capacitor modules can bear the energy requirement of the entire output power together, and the utilization ratio of the capacitance is improved; the vertical laminated structures of the anode and the cathode copper bars of the capacitor modules, the line impedance and the stray inductance parameter are minimized so as to reduce the ripple current between the capacitor modules; and the capacitor modules adopt the independent structural design, thereby facilitating distributed installation and maintenance.

Description

technical field [0001] The invention relates to an inverter, and more specifically, relates to a DC bus bar connection structure of a high-power three-phase inverter. Background technique [0002] In high-power three-phase inverter products, the layout design of its components has higher requirements in terms of maintainability, and the unit components often adopt a modular design. In the traditional high-power three-phase inverter, the number of electrolytic capacitors is large, the volume and weight are large, and the overall installation is difficult. Therefore, in this type of high-power inverter, the capacitors are installed in groups. Such as figure 1 As shown, in the traditional high-power three-phase inverter, the capacitor adopts a modular design. In this inverter, three capacitor modules (CAPA, CAPB, CAPC) and three inverter switch tube modules (INVA , INVB, INVC), each capacitor module is connected in parallel with an inverter switching tube module, and then con...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a combination of capacitor group installation and reduction of ripple current between capacitors in the bus connection of high-power three-phase inverters in the prior art. Group installation and DC bus connection structure of high-power three-phase inverters that can reduce the ripple circuit between capacitors

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