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Adaptive passive pi control method for grid-connected inverter system based on mmc

A technology of inverter system and control method, which is applied in the field of stability control of modular multilevel converters, can solve problems such as increasing the complexity of controller design, and achieve the effects of simple structure, wide application range, and few constraints

Active Publication Date: 2019-02-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Most of the existing PBC methods are based on coordinate transformation, and the Eular-Lagrangian equation is designed to achieve decoupled stable control. However, coordinate transformation will increase the complexity of controller design. Can the transformation link be omitted to further simplify PBC design and improve parameter perturbation automatic control? Adaptability, realize the PBC method that is easy to apply, excellent in performance, wide in the stable domain, and good in robustness, and is a problem to be solved for nonlinear control research

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  • Adaptive passive pi control method for grid-connected inverter system based on mmc
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Embodiment Construction

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0060] Three-phase MMC circuit structure and sub-module schematic diagram figure 1 As shown, there are N sub-modules in the upper and lower bridge arms of each phase, and each sub-module is composed of a half-bridge circuit connected in parallel with a DC capacitor. In order to suppress the voltage imbalance caused by the input and exit of sub-modules, a small inductor is connected in series with each bridge arm.

[0061] If the on-off of the bridge arm is controlled by the insertion coefficient n(t), it is defined that when all submodules of the bridge arm are bypassed, n(t)=0; when...

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Abstract

The invention relates to an adaptive passive PI control method for a grid-connected inverter system based on MMC. The grid-connected inverter system includes a three-phase AC voltage source, an uncontrollable rectifier, a DC bus link, a three-phase modular multiple A level inverter and a power grid, each phase of the three-phase modular multilevel inverter includes an upper bridge arm and a lower bridge arm, and the method includes the following steps: in the a-b-c stationary coordinate system , establish a bilinear Lagrangian model; according to the bilinear Lagrangian model, a passive PI control method is obtained; in the passive PI control method, an adaptive adjustment gain coefficient is added to realize a high-power grid-connected inverter system based on MMC Adaptive passive PI control. Compared with the prior art, the invention has the advantages of simple structure, wide stable domain, less constraints, excellent robust performance, wide application range and the like.

Description

technical field [0001] The invention relates to the field of stability control of modular multilevel converters, in particular to an adaptive passive PI control method of an MMC-based grid-connected inverter system. Background technique [0002] In recent years, with the rapid development of megawatt-level wind turbines, large-scale photovoltaic grid-connected power plants, and flexible high-voltage direct current transmission systems, traditional two-level inverters can no longer meet application requirements due to device withstand voltage performance and control performance. Modular Multilevel Converter (MMC) has been widely used and popularized in high-power grid-connected inverter systems. MMC has the characteristics of strong structural scalability, small sub-module withstand voltage requirements, and low switching frequency. Its own multivariable, strong nonlinear characteristics and the problem of time-varying unknown disturbances in the system in practical applicat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/5387H02M7/539
CPCH02J3/38H02M7/5387H02M7/539H02J2203/20H02M1/0003
Inventor 薛花王育飞李杨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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