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MMC redundant power module control method based on flexible HVDC system

A technology of power modules and power transmission systems, applied in the direction of output power conversion devices, electrical components, power transmission AC networks, etc., can solve problems such as high cost and complicated control methods, and achieve the effect of ensuring reliability and stability

Inactive Publication Date: 2018-12-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of MMC redundant power module control method based on the flexible direct current transmission system, solves the problem that the MMC redundant power module control method is complex and costly in the prior art

Method used

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  • MMC redundant power module control method based on flexible HVDC system
  • MMC redundant power module control method based on flexible HVDC system
  • MMC redundant power module control method based on flexible HVDC system

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Embodiment 1

[0043] see figure 1 On the AC side shown, the phase voltage on the AC side of the flexible DC transmission system is 5.65kV; see figure 1 DC side shown, DC side voltage U dc ±10kV; each bridge arm has 20 normal power modules and 2 redundant power modules, the capacitance value of the power module is 2.4mF, and the rated voltage of the capacitor is 1kV, see figure 2 , the power module topology is a half-bridge structure.

[0044] Taking the upper bridge arm of phase A as an example, the control method of the MMC redundant power module based on the flexible direct current transmission system provided by the present invention, the steps are as follows:

[0045] Step 1: According to figure 2 The topology of the mid-power module shows that the voltage-sharing resistor R and the energy-fetching power supply are fixed loads of the capacitor of the power module. Therefore, the voltage-balancing resistor R and the energy-fetching power supply will continuously consume the energy o...

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Abstract

The invention discloses a MMC redundant power module control method based on a flexible HVDC transmission system, When the capacitance of the redundant power module has the initial energy, the redundant power module will be controlled by static voltage balance control. When the power module is not faulty, the capacitance voltage of the redundant power module of the MMC will be controlled between the minimum value of static balance and the maximum value of static balance. When the power module is faulty, the bypass switch S bypasses the faulty power module at the first time, and at the same time, the redundant power module is charged, and the capacitance voltage of the redundant power module will soon reach the rated value. When the capacitance voltage of the redundant power module reachesthe rated value, the control signal of the fault power module before the fault occurs is transplanted to the corresponding redundant power module. Thereafter, the redundant power module will work healthily like other normal power modules, which can ensure the reliability and stability of the operation of the flexible HVDC transmission system.

Description

technical field [0001] The invention relates to the technical field of MMC redundant power module control, in particular to a MMC redundant power module control method based on a flexible direct current transmission system. Background technique [0002] With the development of high-voltage power electronic technology, the application of VSC (voltage source converter, voltage source converter) in the power system is increasing day by day. [0003] As one of the most attractive VSC topologies, MMC (Modular Multilevel Converter) is especially suitable for high voltage and high power applications. Due to the characteristics of modularity, scalability, high efficiency, distributed DC capacitors, easy assembly, and very low output harmonics, MMCs are widely used in high-voltage DC, medium-voltage high-power motor drives and photovoltaic power generation systems. [0004] In the flexible DC transmission system, the reliability of MMC determines the stability of the transmission sy...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02J3/36
CPCH02J3/36H02M1/32Y02E60/60
Inventor 雒龙飞贾立新张彦斌杨立霞
Owner XI AN JIAOTONG UNIV