Five-level self-balanced inverter based on bridge switched capacitor module

Abstract

The invention discloses a five-level self-balanced inverter based on a bridge switched capacitor module and relates to a multi-level inverter. The five-level self-balanced inverter is provided with the bridge switched capacitor module and two half-bridge circuits. The bridge switched capacitor module is provided with an H bridge and a switched capacitor module. The H bridge is provided with four high-frequency switches S1, S2, S3, and S4. The switched capacitor module is provided with a first capacitor C1a and a second capacitor C1b which are in series connection with a first capacitor network, a third capacitor C2a and a fourth capacitor C2b which are in series connection with a second capacitor network, and four full-controlled devices MOSFET switching tubes S1a, S1b, S2a, and S2b. The two half-bridge circuits are formed by four full-controlled devices MOSFET switching tubes S5, S6, S7, and S8. The five-level self-balanced inverter based on the bridge switched capacitor module may output five levels including 0, +-/2Ui, and +/-4Ui by controlling switch operating state, and achieves boosted output while outputting the multiple levels.

Description

technical field [0001] The invention relates to a multilevel inverter, in particular to a five-level self-balancing inverter based on a bridge-type switched capacitor module. Background technique [0002] With the extensive application of nonlinear loads and time-varying loads such as power electronic devices in power systems, industries, rail transit, and household appliances, the reactive power and harmonic losses of the power grid are also becoming more and more serious. Reactive power and harmonic loss in the power grid not only lead to a reduction in the efficiency of power generation, transmission and distribution, and power consumption, but also affect the reliability of electrical equipment. In severe cases, it may cause equipment damage and endanger the safe operation of the power grid. The integrated power flow controller (UPFC) and power active filter composed of high-voltage and large-capacity multi-level inverters have become the most direct and effective treatm...

AI Technical Summary

Problems solved by technology

Among them, the flying-span capacitor clamp topology uses clamp capacitors to realize device clamping, which requires a large number of clamp capacitors; in addition, this topology has the problem of capacitor voltage imbalance, so its popularization and application is limited.

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