AC filter bank reactive power control method in high-voltage DC transmission system

An AC filter, filter bank technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve the problems of reactive power reduction and AC bus voltage increase in converter stations

Inactive Publication Date: 2017-03-22
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the DC system operates under light load, the reactive power consumed by the converter decreases sharply. If the reactive power compensated by the filter remains unchanged, the excess reactive power of the converter station will flow into the AC system, resulting in AC bus voltage rises

Method used

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Embodiment Construction

[0045] Preferred embodiments of the present invention are specifically described below.

[0046] The present invention provides a reactive power control method for an AC filter bank in a high-voltage direct current transmission system, comprising the following steps: step S0.1, the reactive power control system determines the control priority:

[0047] First priority: ensure that the number of filter groups meets the absolute minimum filter capacity limit Abs Min Filter, the Abs Min Filter is the absolute minimum filter capacity limit, which is the absolute minimum filter required to prevent overloading of filtering equipment Number of groups;

[0048] The second priority: to ensure that the AC bus voltage meets the highest / lowest voltage limit U max, which is the highest / lowest voltage limit, which is used to monitor and limit the steady-state AC bus voltage to avoid frequent actions of protection;

[0049] The third priority: ensure that the reactive power exchange flow fro...

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Abstract

The invention discloses an AC filter bank reactive power control method in a high-voltage DC transmission system, which realizes the absolute minimum filter capacity limit, the highest/lowest voltage limit, the maximum reactive power exchange limit, the minimum filter capacity limit, and reactive power exchange control and voltage control. Switching of the filters can be controlled effectively in real time, and in each operation condition of the high-voltage DC transmission system, the reactive power exchanged between a converter station and the AC system can be kept in a given range, or the voltage of the AC bus in the converter station can be kept in a required range.

Description

technical field [0001] The invention relates to a reactive power control method for an AC filter group in a high-voltage direct current transmission system. Background technique [0002] Long-distance transmission problems will be encountered when electric energy is transmitted from large-scale thermal power, hydropower and other power plants to remote load center areas. To achieve long-distance high-power transmission, ultra-high voltage or ultra-high voltage transmission technology is required. UHV AC transmission is currently the most basic long-distance power transmission method at home and abroad, while UHV DC transmission does not have synchronization stability problems, and is an ideal way for large-area grid interconnection. [0003] Compared with AC transmission, the advantages of DC transmission are: long-distance high-power transmission, DC transmission is not restricted by the stability of synchronous operation, and plays a great role in ensuring the stable oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/18Y02E40/30
Inventor 崔勇冯煜尧郭强张开宇张琪祁冯楠杨增辉谢伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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