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Hybrid Multilevel Converter and Its Variable Switching Frequency Trajectory Optimal Control Method

A hybrid multi-level, trajectory optimization technology, which is applied in the direction of converting irreversible DC power input to AC power output, can solve the problems of large switching loss, fixed switching frequency, and difficult controller design.

Inactive Publication Date: 2017-05-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Another object of the present invention is to provide a control method by introducing a variable switching frequency track optimization control method to overcome the difficulty of controller design in traditional control methods, difficulty in coordinating voltage controller and current controller parameters, fixed switching frequency and large switching loss Shortcomings

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  • Hybrid Multilevel Converter and Its Variable Switching Frequency Trajectory Optimal Control Method

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Embodiment Construction

[0110] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but the content protected by the present invention is not limited to the following description.

[0111] Such as figure 1 As shown, the hybrid multilevel converter, the hybrid multilevel converter, is connected between the DC grid and the three-phase AC grid, using M ij Represents the jth module of the i-th phase of the hybrid multilevel converter, where i=a, b, c; j=1,...,2N, a, b, c represent the hybrid multilevel converter A, B, C three-phase, N is the number of sub-modules of each bridge arm, then M ij Contains the following submodules:

[0112] m i1 and M i(2N) The active filter sub-module constituted for the full-bridge inverter is used to suppress the harmonic component in the circulating current of the hybrid multilevel converter;

[0113] m i2 ,...,M i(2N-1) It is a half-bridge inverter sub-module for synthesizing multi-level vol...

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Abstract

The invention discloses a hybrid multilevel converter and its variable switching frequency trajectory optimization control method. The hybrid multilevel converter is connected between a DC power grid and a three-phase AC power grid, and its variable switching frequency trajectory is optimized. The control method includes the following steps: S1. Establishing the differential equation model of the hybrid multilevel converter; S2. Deriving the discretized state equation from the k+1th step to the k+δth step; S3. Determining the feasible sampling of the output current prediction value Point set; S4. Obtain the optimal value fθ, opt(k) of the objective function fθ(k), and use the switching function vector Sθ, opt[k] corresponding to the feasible prediction point as the kth step of the hybrid multilevel converter The switching signal of the digital signal processor is completed, and the PWM switching signal is sent at the time corresponding to the optimal prediction point of the current trajectory. The invention can realize the stable control of DC bus capacitance voltage of each full-bridge inverter and half-bridge inverter of the upper and lower bridge arms, the fast trajectory tracking of the AC side current and the optimal control of variable switching frequency.

Description

technical field [0001] The invention belongs to the technical field of power electronic converter control and flexible power transmission and distribution of power systems, and relates to the control technology of hybrid multilevel converters, in particular to a hybrid multilevel converter and its variable switching frequency track optimization Control Method. Background technique [0002] The rapid development of power electronic devices and digital signal processors provides a broad development space for the practical application of high-performance power conversion and control devices. The power electronic converter topology has experienced the traditional two-level converter, neutral point clamp Bit type (NPC) three-level converters, and several stages of multi-level power electronic converters. The multi-level power electronic converter adopts the series and parallel connection of power electronic devices or basic conversion circuits, which significantly improves the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/49
Inventor 韩杨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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