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Method for MMC type VSC-HVDC system precharge control

A technology of VSC-HVDC and control method, which is applied in the field of pre-charging control of MMC type VSC-HVDC system, can solve problems such as imperfect control methods, and achieve the goal of taking into account charging efficiency, good harmonic characteristics, and reducing overshoot current Effect

Inactive Publication Date: 2013-10-02
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are relatively few studies on the start-up of MMC VSC-HVDC systems, and the control methods are not perfect enough.

Method used

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  • Method for MMC type VSC-HVDC system precharge control
  • Method for MMC type VSC-HVDC system precharge control
  • Method for MMC type VSC-HVDC system precharge control

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Embodiment Construction

[0026] Further illustrate the present invention below in conjunction with accompanying drawing.

[0027] The invention provides a control method for precharging of an MMC type VSC-HVDC system. The system hardware structure includes a connection transformer, a current limiting resistor, a filter, an AC circuit breaker, a voltage source converter, a phase reactor, a control device, and a protection device. ;Each converter is composed of six bridge arms, each bridge arm is composed of several sub-modules, each sub-module is composed of two IGBTs, two DIODEs, and an energy storage capacitor; the detection circuit transmits real-time voltage and current signals For the control circuit, the control circuit transmits the PWM signal to the drive circuit according to the set control strategy, and the drive circuit is connected to all IGBTs to control the input and removal of the sub-modules. It is characterized in that: the MMC type VSC-HVDC system is pre-charged The control method inc...

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Abstract

The invention discloses a method for MMC type VSC-HVDC system precharge control. The method is based on a CPSM (carrier phase shifted modulation) strategy and controls by adoting a voltage outer ring and a current inner ring, wherein the voltage ring controls capacitor voltage of a sub-module, and the current ring controls three-phase AC current. The method disclosed by the invention gives consideration to the precharge speed and the precharge efficiency while limiting impact current and preventing overvoltage. The control method is clear in thinking, easy in engineering realization, and has good dynamic performance and steady-state performance.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a method for controlling precharging of an MMC type VSC-HVDC system. Background technique [0002] Most of the VSC-HVDC systems that have been put into operation at present adopt the form of two-level or three-level, and the structure and control are relatively simple, but there are problems such as difficult voltage equalization of series devices and large switching loss. MMC has been favored day by day since it was proposed, because it has the characteristics of modularization and easy expansion, and can effectively realize power conversion at high voltage and high power levels. [0003] As a prerequisite for the normal operation of the MMC-HVDC system, start-up is a complex transient process. The main goal of start-up is to establish the rated voltage of the sub-module and the DC side through a certain control strategy, and its essence is the pre-charging of the converter cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00
CPCH02M1/36H02M7/4835
Inventor 姜燕胡敬伟黄守道王辉罗德荣高剑
Owner HUNAN UNIV
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