Control method for improving cascaded hybrid direct current mono-pole operation power limit

A hybrid DC and operating power technology, applied in reactive power adjustment/elimination/compensation, flexible AC transmission system, power transmission AC network, etc., can solve the problem of lowering the AC bus voltage, increasing LCC DC commutation failure, and consumption Reactive power increase and other problems, to achieve the effect of simple control and reduce the risk of commutation failure

Active Publication Date: 2021-07-02
JIANGSU ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • 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

Method used

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  • Control method for improving cascaded hybrid direct current mono-pole operation power limit
  • Control method for improving cascaded hybrid direct current mono-pole operation power limit
  • Control method for improving cascaded hybrid direct current mono-pole operation power limit

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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 improving the operation power limit of a cascaded hybrid direct-current mono-pole. The control method comprises the following steps: firstly, normally unlocking and starting a cascaded hybrid direct current pole I to a rated operation state, enabling an LCC converter station of a pole II to be in a shutdown state, then unlocking an MMC converter station of the pole II and working in an STATCOM mode, increasing reactive power through the MMC converter station of the pole II, and satisfying the reactive power requirement of the LCC direct current after the power of the pole I is improved. On the premise that no extra reactive power compensation device is added, the reactive power requirement of the LCC direct current after the hybrid direct current mono-pole power is improved is met, and a hybrid direct current mono-pole system can operate normally and stably; and the risk of LCC direct current commutation failure after the mono-pole power is increased can be reduced, the control is simple, and no additional equipment is needed.

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 Applications(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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