Method for cooperatively controlling multiport flexible DC power transmission system

A DC transmission system and coordinated control technology, applied in the electrical field, can solve problems such as large system shocks, no calculation and selection methods for system parameters, and inability to achieve smooth transition of system operating states, so as to achieve the effect of ensuring smooth transition

Inactive Publication Date: 2014-09-03
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method uses the control mode switching of the standby station to realize the DC voltage control under fault conditions. The defect is that the system fluctuates greatly during the control mo...

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  • Method for cooperatively controlling multiport flexible DC power transmission system
  • Method for cooperatively controlling multiport flexible DC power transmission system
  • Method for cooperatively controlling multiport flexible DC power transmission system

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the drawings and embodiments.

[0049] A coordinated control method for a multi-terminal flexible DC transmission system based on improved descent regulation characteristics, including the control of the main converter station, wind farm converter station, auxiliary converter station and active power control (APC) converter station Strategy

[0050] Each converter station adopts an advanced control strategy based on a local controller; the leading converter station is responsible for DC voltage control, adopts constant DC voltage control and constant reactive power control strategies; the wind farm converter station is responsible for collecting the active power of the wind farm group , Adopts frequency control and AC voltage control; auxiliary converter station assists in realizing DC voltage control, adopts DC voltage control with drop characteristics and constant reactive power control strategy; act...

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Abstract

The invention discloses a method for cooperatively controlling a multiport flexible DC power transmission system. The DC power transmission system comprises a dominant convertor station, a wind power plant convertor station, an auxiliary convertor station and an active power control convertor station. The dominant convertor station is used for controlling the DC voltages of the entire system. The wind power plant convertor station is in charge of collecting the active power of a wind power plant group. The auxiliary convertor station is used for assisting to achieve control over the DC voltages of the system. The active power control convertor station is used for transforming constant active power to an AC side power grid. The auxiliary convertor station and the active power control convertor station are both controlled based on the improved DC voltage -active power coastdown adjusting characteristics. The method for cooperatively controlling the multiport flexible DC power transmission system has the advantages of being used for DC voltage control and active power distribution of all convertor stations of the multiport flexible DC power transmission system under any operation stations, and it is guaranteed that the multiport flexible DC power transmission system is in smooth transition between various operation states.

Description

Technical field [0001] The invention relates to the electrical field, in particular to a coordinated control method for a multi-terminal flexible direct current transmission system based on improved down regulation characteristics. Background technique [0002] Under the situation of energy shortage and increasingly severe environmental pollution, countries around the world have continuously expanded their investment in wind and solar power generation. The development of large-scale offshore wind farms has become a major international trend in wind energy utilization. Since offshore wind farms are far away from the coast, the onshore and land grids they are connected to are often weak. The integration of wind power has a greater impact on the stability and power quality of the connected grids. When offshore wind power is developed on a large scale, it is multi-end flexible DC transmission has become the best choice, so its related research has received extensive attention. The D...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 李可军荆平任敬国赵国亮孙立军田鑫蔡林海
Owner SHANDONG UNIV
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