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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 effects of suppressing circulating current, clear physical model, and reducing system switching frequency

Active Publication Date: 2020-11-03
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 and in conjunction with the accompanying drawings.

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

[0032] The invention provides a low-frequency model predictive control method based on a hybrid modular multi-level converter, which is suitable for high-voltage and high-power occasions. The method is based on a discrete model of the system and proposes a model composed of upper, middle and lower layers of control Predictive Control Strategies.

[0033] figure 1 It is a topology diagram of a hybrid modular multilevel converte...

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Abstract

The invention provides a low-frequency model predictive control method based on a hybrid modular multilevel converter, which realizes a low-frequency model predictive control strategy based on upper, middle and lower layers of control: The current, circulating current and bridge arm capacitor voltage control the required bridge arm output level, and effectively reduce the amount of optimization calculation; the middle layer control uses the H bridge module control algorithm to stabilize the H bridge module capacitor voltage and calculate its equivalent output level. And determine the switching number of the half-bridge sub-module of the bridge arm; the lower layer control determines the switching signal of each sub-module according to the optimal control strategy of the sub-module capacitor voltage, realizes the balanced control of the sub-module capacitor voltage, and reduces the average switching of the sub-module frequency.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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