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Low frequency model predictive control method based on hybrid modular multilevel converter

A modular multi-level, model predictive control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., to achieve the effect of suppressing circulating current, clear physical model, and reducing the switching frequency of the system

Active Publication Date: 2018-02-16
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

At present, model predictive control is widely used in traditional MMC, but the application in hybrid MMC system still needs further research

Method used

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  • Low frequency model predictive control method based on hybrid modular multilevel converter
  • Low frequency model predictive control method based on hybrid modular multilevel converter
  • Low frequency model predictive control method based on hybrid modular multilevel converter

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Embodiment Construction

[0030] The present invention will be described in detail below through specific steps in conjunction with the drawings.

[0031] In order to make the technical problems, technical solutions, and control effects solved by the present invention clearer, the following describes the present invention in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0032] The invention provides a low-frequency model predictive control method based on a hybrid modular multilevel converter, which is suitable for high-voltage and high-power occasions. The method is based on a system discrete model and proposes a model composed of upper, middle and lower three-layer control Predictive control strategy.

[0033] figure 1 It is the topological structure diagram of the hybrid modular multilevel converter. Hybrid...

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Abstract

The invention provides a low frequency model predictive control method based on a hybrid modular multilevel converter. A low frequency model predictive control policy based on upper, middle and lowerlayer control is realized. The upper-layer control establishes an index function and selects a bridge arm output level which meets current, circulating current and bridge arm capacitor voltage controlrequirements of the alternating current side. The optimization calculation amount is effectively reduced. The middle-layer control uses an H-bridge module control algorithm to stabilize the H-bridgemodule capacitor voltage. The equivalent output level is calculated. The number of switching of a bridge arm half-bridge sub-module is determined. The lower-layer control determines the switching signal of each sub-module according to the optimization control policy of the sub-module capacitance voltage. Balance control of the sub-module capacitance voltage is realized. The average switch frequency of sub-modules is reduced.

Description

Technical field [0001] The invention relates to a low-frequency model predictive control method based on a hybrid modular multilevel converter, which belongs to the field of power electronics. Background technique [0002] With the development of the power system, a large number of reactive loads have reduced the power factor of the grid, which has a certain adverse effect on the stability, safety and economic operation of the system. The static synchronous compensator (STATCOM), as an important part of the flexible AC transmission system (FACTS), can effectively increase the system power factor and improve the power quality. The expansion of the scale of the power system requires that STATCOM can be used in high-voltage and high-power applications, so the capacity and voltage level of the compensation device need to be improved. Modular multilevel converter (MMC), as a new type of multilevel converter, is widely used in long-distance inverters due to its modular structure, easy...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02J3/18
CPCH02J3/18H02M7/483H02M7/4835Y02E40/30
Inventor 张开宇郭强冯煜尧崔勇余颖辉冯楠熊雪君
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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