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A control method for increasing the operating power limit of cascaded hybrid DC unipolar

A hybrid DC and operating power technology, applied in reactive power adjustment/elimination/compensation, power transmission AC network, flexible AC transmission system, etc., can solve the problem of increased reactive power consumption, increased LCC DC commutation failure, pull Problems such as low AC bus voltage

Active Publication Date: 2021-09-10
JIANGSU ELECTRIC POWER RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] If only the cascaded hybrid DC unipolar operating power is increased, the increase of LCC DC power will inevitably lead to the increase of LCC DC reactive power consumption, and the increase of LCC DC reactive power demand will cause it to absorb a large amount of reactive power from the adjacent AC system , lowering the AC bus voltage to a certain extent, increasing the risk of LCC DC commutation failure; on the other hand, the increase in LCC DC reactive power demand may cause the action of the reactive power compensation device of the AC system, which brings additional control problems

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  • A control method for increasing the operating power limit of cascaded hybrid DC unipolar
  • A control method for increasing the operating power limit of cascaded hybrid DC unipolar
  • A control method for increasing the operating power limit of cascaded hybrid DC unipolar

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The present invention provides a control method for increasing the operating power limit of cascaded hybrid DC unipolar poles. First, the cascaded hybrid DC pole I is normally unlocked and started to a rated operating state, and the LCC converter station of pole II is in a shutdown state, and then Unlock the MMC converter station of Pole II and work in STATCOM (Static Synchronous Compensator, Static Synchronous Compensator) mode, and increase the reactive power through the MMC converter station of Pole II to meet the reactive power demand of LCC DC after the power of Pole I is increased. Specific steps are as follows:

[0023] Step 1: In a cascaded hybrid DC system with multi-point receivers, unlock the cascaded hybrid DC pole I under a given AC system operation mode; the specific method is: first unlock the low end of the rece...

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Abstract

The invention discloses a control method for increasing the operating power limit of a cascaded hybrid direct current unipolar. First, the cascaded hybrid direct current pole I is normally unlocked and started to a rated operation state, and the LCC converter station of pole II is in a shutdown state, Then unlock the MMC converter station of pole II and work in STATCOM mode, and generate additional reactive power through the MMC converter station of pole II to meet the reactive power demand of LCC DC after the power of pole I is increased. The invention can meet the reactive power requirements of LCC DC after the hybrid DC unipolar power is boosted without adding an additional reactive power compensation device, so that the hybrid DC unipolar system can operate normally and stably; it can reduce the LCC DC conversion after the unipolar power is boosted There is no risk of phase failure, and the controls are simple and require no additional equipment.

Description

technical field [0001] The invention relates to the technical field of hybrid direct current transmission, in particular to a control method for increasing the operating power limit of cascaded hybrid direct current unipolar operation. Background technique [0002] Due to the combination of conventional direct current (LCC-HVDC) and flexible direct current (VSC-HVDC) two respective advantages, hybrid direct current transmission has become an important development direction of direct current transmission technology in recent years. Receiver cascaded hybrid DC power transmission (such as figure 1 )’s rectifier station consists of two sets of 12-pulse LCCs in series, and the inverter station consists of a set of 12-pulse commutation converters (LCCs) and voltage source converters (VSCs) connected in series in parallel, and the low-end VSC is extended to Multiple VSCs are connected in parallel and placed on different regional power grids. While increasing the transmission power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/18
CPCH02J3/18H02J3/36Y02E40/10Y02E60/60
Inventor 赵静波王大江朱宇萌王相飞李保宏
Owner JIANGSU ELECTRIC POWER RES INST
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