DC fault ride-through control method for hybrid modular multilevel converter

A modular multi-level, DC fault ride-through technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. Performance requirements, the effect of ensuring continuity

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The fundamental shortcomings of the above two control methods are: first, the robustness of the group control method is insufficient; second, the DC transient fault still needs to block the converter

Method used

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  • DC fault ride-through control method for hybrid modular multilevel converter
  • DC fault ride-through control method for hybrid modular multilevel converter
  • DC fault ride-through control method for hybrid modular multilevel converter

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Embodiment Construction

[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] Aiming at the steady state of the sub-module hybrid modular multilevel converter and its DC fault ride-through problem, the present invention proposes a DC fault ride-through control method for the hybrid modular multilevel converter. In the present invention, whether a DC bipolar short-circuit fault occurs is determined by monitoring the DC voltage value and its rate of change. If no short-circuit fault occurs, determine the number of input sub-modules in the valve section of each half-bridge sub-module and the valve section of the full-bridge sub-module according to the number of half-bridge and full-bridge sub-modules in the bridge arm and the average voltage of the two sub-modules; When a DC short-circuit fault occurs, the number of input sub-modules of the half-bridge sub-module in the bridge arm is 0, and th...

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Abstract

A DC fault ride-through control method of a hybrid modular multilevel converter. The control method dynamically configures the number of added half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) within the same leg by controlling the addition and removal of HBSMs and FBSMs (3, 4)in the leg and tracking the average of capacitance and voltage of the HBSMs and FBSMs and monitoring the DC side fault state based on the effectively operated HBSMs and FBSMs, thus realizing the balance of capacitance and voltage of the HBSMs and FBSMs in the steady state, and achieving effective control of AC / DC current and voltage during a transient state DC fault. The method ensures continuous operation of a converter and prevents shutdown of the converter due to a fault.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission in power systems, in particular to a direct current fault ride-through control method for a hybrid modular multilevel converter. Background technique [0002] The half-bridge and full-bridge structure sub-module hybrid modular multilevel converter (Cell Hybrid Modular Multilevel Converter, CH-MMC) adopts a new type of multilevel topology that is more popular in the world. Its core unit—submodule (Sub Module, SM) is divided into two types. One is a half-bridge sub-module (Half Bridge Sub-Module, HBSM, figure 1 3); the other is a full bridge sub-module (Full Bridge Sub-Module, FBSM, figure 1 4). Several half-bridge structure sub-modules are cascaded to form a half-bridge structure sub-module valve section (HBSM Valve); several full-bridge structure sub-modules are cascaded to form a full-bridge structure sub-module valve section (FBSM Valve); The structural sub-modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/32H02M1/0096H02M7/4835
Inventor 孔明汤广福杨杰马巍巍季兰兰李泓志
Owner STATE GRID CORP OF CHINA
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