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A sub-module capacitor voltage equalization control system for MMC

A technology of equalization control and capacitor voltage, applied in electrical components, output power conversion devices, etc., can solve the problems of complex action time calculation, difficult sub-module capacitor voltage equalization control, redundant switch state vector increase, etc.

Active Publication Date: 2018-12-14
NANCHANG INST OF TECH
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  • Abstract
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Problems solved by technology

However, when the SVPWM method is used in multilevel converters, with the increase of the number of levels, the number of basic vectors increases greatly, and the redundant switch state vectors also increase greatly. The selection of switch state vectors and the calculation of their action time are extremely complicated. It is difficult to implement the SVPWM method, especially when it is used for MMC modulation, it is difficult to achieve sub-module capacitor voltage balance control, so the SVPWM method is not suitable for MMC

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  • A sub-module capacitor voltage equalization control system for MMC
  • A sub-module capacitor voltage equalization control system for MMC
  • A sub-module capacitor voltage equalization control system for MMC

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Embodiment Construction

[0094] The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

[0095] figure 1 Shown is a three-phase MMC circuit topology and half-bridge sub-module structure diagram in which each bridge arm contains n half-bridge sub-modules. Each of the three half-bridge sub-modules SM surrounded by dotted boxes in the figure i (i takes 1, 2, 3, ..., n) to form a suspended three-phase sub-module. On the α'-β' coordinate system, the three-phase sub-module adopts space vector modulation, and the expression of its basic vector is as formula (3). Since the output of the half-bridge sub-module is two-level, the space vector of the three-phase sub-module can be calculated according to formula (3), and its distribution is as follows figure 2 shown. figure 2 It is the space vector distribution of the three-phase sub-module and the reference voltage vector trajectory diagram. The small black dots in the figure represe...

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Abstract

The invention discloses a sub-module capacitor voltage equalization control system for an MMC, which comprises an MCU and a sampling module. The MCU comprises a model analysis unit, a basic vector action time calculation unit, a phase shift and cycle control unit, and a pulse generation unit. The data collected by the sampling module enters the model analysis unit in the MCU. The model analysis unit, basic vector action time calculation unit, phase shift and cycle control unit, and pulse generation unit are sequentially connected; The MMC is a three-phase modular multi-level converter, and thethree-phase modular multi-level converter has three-phase six bridge arms, each bridge arm is formed by cascading n sub-modules; Each bridge arm is connected with an inductor L; The phase shifting and pulse generating unit generates two sets of pulses to control the upper bridge arm and the lower bridge arm in the MMC respectively. The system is easy to control, simple in structure, good in expansibility and easy to implement.

Description

technical field [0001] The present invention relates to the field of sub-module capacitor voltage equalization control method of modular multilevel converter (MMC) in the field of power electronics and automatic control, and relates to a MMC sub-module capacitor voltage based on phase-shifting space vector modulation The balanced control system specifically refers to a control system that uses a cyclic phase-shifting space vector modulation strategy to achieve equalization of the capacitor voltage of the MMC sub-module under the α'-β' coordinates. Background technique [0002] As a very popular circuit topology for medium-voltage and high-power converters, MMC has the following main advantages: highly modular structure, easy to expand system capacity and industrial production; no need for multiple isolated DC power supplies and output transformers, simplifying The circuit structure is improved to reduce the system loss; the low withstand voltage switching device is used to r...

Claims

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Application Information

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IPC IPC(8): H02M1/088H02M1/32
CPCH02M1/088H02M1/32
Inventor 王翠朱能飞崔晓斌杨小品张兴旺曾瑄欧阳俊铭
Owner NANCHANG INST OF TECH
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