Multiterminal flexible direct current power transmission system included power grid operation control system and method

A DC transmission system, multi-terminal flexible technology, applied in the direction of power transmission and AC network, etc.

Inactive Publication Date: 2012-12-12
SHENYANG POLYTECHNIC UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For flexible HVDC transmission, especially involving multi-terminal flexible HVDC transmission, mature de

Method used

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  • Multiterminal flexible direct current power transmission system included power grid operation control system and method
  • Multiterminal flexible direct current power transmission system included power grid operation control system and method
  • Multiterminal flexible direct current power transmission system included power grid operation control system and method

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Embodiment Construction

[0062] The specific implementation of the present invention will be further described below in conjunction with the drawings.

[0063] In this embodiment, the target power grid is a power grid formed by connecting a 6-terminal flexible DC transmission system and an AC system. The grid is a mesh structure in which a multi-channel DC transmission network and an AC power grid are coupled, and a grid operation control system including a multi-terminal flexible DC transmission system Including multi-terminal flexible DC transmission system, detection unit, control unit and load;

[0064] The inverter side of the converter end of the multi-terminal flexible DC transmission system is connected to the load, and the inverter side is connected to the AC grid through the grid tie line; the power generation unit of the multi-terminal flexible DC transmission system is mainly a generator, and the power transmission is based on multi-terminal flexible DC The bus is completed in parallel with the...

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Abstract

The invention provides a multiterminal flexible direct current power transmission system included power grid operation control system and method. The method comprises the following steps of detecting alternating current bus voltage, alternating current bus phase angles and direct current bus voltage of various current converting terminals of a multiterminal flexible direct current power transmission system in real time; when a power grid is failed, and when the power grid is in a transient fault operation mode, performing transient stability operation control on the power grid; when the power grid is in a static fault operation mode, performing static stability operation control on the power grid; and uploading fault information and control information to a control center. According to a power voltage control decision model disclosed by the invention, a control strategy for the static security and stability operation of the multiterminal flexible direct current power transmission network included power grid is carried out, while in the transient fault operation of the power grid, a target function and a boundary condition for the transient stability operation control are established; as a control vector is solved, the corresponding current converting terminals are controlled through the calculated control vector, and thus, the voltage stability of the multiterminal direct current network and the emergency command strategy when the alternating current power grid is in the transient fault operation are effectively realized.

Description

Technical field [0001] The invention relates to the field of power grid dispatch control, in particular to a power grid operation control system and method containing a multi-terminal flexible direct current transmission system. Background technique [0002] With the continuous increase of the installed capacity in the power system, the requirements for the transmission capacity of the grid operation are increasing. However, DC transmission has obvious advantages over traditional AC transmission, and the development of flexible DC transmission technology provides a good application space for DC transmission. For HVDC Flexible, it especially involves multi-terminal HVDC Flexible. It has not yet built a mature demonstration project in the world. Therefore, compared with the traditional AC grid dispatching control strategy, the power grid with multi-terminal HVDC transmission network is stable The control strategy is still in a technological gap. Summary of the invention [0003] T...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 徐建源李家珏齐伟夫张明理
Owner SHENYANG POLYTECHNIC UNIV
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