Smooth switching method for control strategy of voltage source type converter

A control strategy, voltage source technology, applied in the direction of power transmission AC network, circuit devices, electrical components, etc., can solve problems such as the inability to meet the high flexibility and controllability requirements of flexible DC transmission, increase adjustment time, etc., to achieve fast and smooth switching. process, reducing transient impact, and the effect of ingenious and reasonable scheme design

Active Publication Date: 2020-12-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to clear the integrator of the control system and restart the control strategy when unlocking. The whole process increases the adjustment time and cannot meet the high flexibility and controllability requirements of flexible DC transmission.

Method used

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  • Smooth switching method for control strategy of voltage source type converter
  • Smooth switching method for control strategy of voltage source type converter
  • Smooth switching method for control strategy of voltage source type converter

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Embodiment 1

[0040] see figure 1 , figure 2 , the voltage source converter control strategy referred to in the present invention includes power and reactive power decoupling control and active and reactive power non-decoupling control. Active and reactive decoupling controls include but are not limited to constant active and reactive power control, constant DC voltage and reactive power control, constant active power and AC voltage control, constant DC voltage and AC voltage control, and DC voltage slope control. Active and reactive non-decoupling controls include but are not limited to amplitude and phase control. The control strategy smooth switching method provided by the present invention is applicable when these types of control strategies are switched.

[0041] Specifically, the voltage source converter control strategy smooth switching method provided by the present invention includes the following steps:

[0042] (1) The control system collects actual electrical values, specifi...

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Abstract

The invention discloses a smooth switching method for a control strategy of a voltage source type converter. The smooth switching method comprises the following steps: acquiring an actual electrical quantity value; after a control strategy switching signal is received, confirming a current control strategy; and enabling the control system to perform initial value setting on the proportional-integral regulator in the control loop, locking a setting value, modifying a control target and switching a control strategy. According to the invention, when the control target of the voltage source type converter is changed, rapid and smooth switching of the control strategy of the voltage source type converter can be realized, transient impact is reduced, and the stability of a power system is improved. According to the invention, an over-current and over-voltage can be prevented in a transient state, the control target of the converter station can be realized in a steady state, and meanwhile, the regulation rapidity is ensured.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a control strategy smooth switching method for a voltage source converter. Background technique [0002] As an important technology in the smart grid, the high-voltage direct current transmission technology (VSC-HVDC) based on the voltage source converter has shown its specific advantages over traditional HVDC. VSC-HVDC can power passive networks, realize large-scale renewable energy grid integration, construct multi-terminal DC grids, independently and quickly control active and reactive power, and realize reverse power supply without voltage polarity inversion. With the increasing demand for grid-connection of new energy sources such as photovoltaics and wind power and passive network power supply, voltage source converters, as an important way of passive network power supply and new energy grid-connection, have gradually attracted attention. [0003] In recent years, ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/36H02J3/24H02J2003/365H02J2203/20Y02E60/60
Inventor 李周李亚州
Owner SOUTHEAST UNIV
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