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Hybrid direct current station control coordination control method and device and power transmission system

A technology of coordinated control and hybrid DC, applied in the direction of reducing/preventing power oscillation, which can solve problems such as inability to allocate a reasonable amount of power modulation

Pending Publication Date: 2017-08-22
CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a coordinated control method, device, and power transmission system for hybrid DC station control, which solves the problem that the DC power transmission system using the frequency control method in the prior art cannot perform frequency stabilization according to the actual situation of each receiving terminal. Allocate a reasonable amount of power modulation to ensure the frequency stability of each receiving end

Method used

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  • Hybrid direct current station control coordination control method and device and power transmission system
  • Hybrid direct current station control coordination control method and device and power transmission system
  • Hybrid direct current station control coordination control method and device and power transmission system

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Embodiment 1

[0028] Embodiment 1. The embodiment of the present invention provides a coordinated control method for hybrid DC station control, such as figure 1 Shown include:

[0029] S101. When the frequency of the conventional DC sending end is disturbed, obtain the difference between the preset frequency of the conventional DC sending end and the current frequency of the conventional DC sending end.

[0030] S102. Generate a power adjustment amount according to the difference, filter the power adjustment amount to obtain the first adjustment amount of the first flexible DC receiving end, and generate a second adjustment amount of the second flexible DC receiving end through subtraction, wherein the second adjustment amount is equal to The power adjustment amount minus the first adjustment amount.

[0031] It should be noted that the first adjustment amount may be equal to the second adjustment amount or the first adjustment amount may be different from the first adjustment amount.

[...

Embodiment 2

[0049] Embodiment 2. The embodiment of the present invention provides a coordinated control device 101 for hybrid DC station control, such as figure 2 Shown include:

[0050] The subtractor 1010, the first node a connected to the subtractor 1010, the first signal input terminal A and the second signal input terminal B, the double-sided frequency difference controller 1011 connected to the first node a, and the double-sided frequency difference control The second node b connected to the device 1011, the power divider 1012 connected to the second node b, the first signal output terminal C and the second signal output terminal D connected to the power divider 1012; the subtractor 1010 is used for conventional When the frequency of the DC sending end is disturbed, the difference between the preset frequency of the conventional DC sending end and the current frequency of the conventional DC sending end is obtained; the double-sided frequency difference controller 1011 is used to g...

Embodiment 3

[0055] Embodiment 3. The embodiment of the present invention provides a power transmission system 10, including: any coordination control device 1011 for hybrid DC station control provided in Embodiment 2, connected to the coordination control device 1011 for hybrid DC station control Conventional DC station controller 102, first flexible DC station controller 103 and second flexible DC station controller 104, rectification side pole controller 105 connected to conventional DC station controller 102, converter valve pole controller 106 connected to rectification side pole controller 105 , the conventional DC sending end converter valve 107 connected to the converter valve pole controller 106, the first inverter side pole controller 108 connected to the first flexible DC station controller 103, the first inverter side pole controller 108 connected to the first inverter side pole controller 108 A modular multilevel converter pole control 109, a modular multilevel converter 110 at...

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Abstract

The embodiment of the invention provides a hybrid direct current station control coordination control method and device and a power transmission system, and relates to the technical field of alternate current and direct current power transmission system transient stability control. The method, the device and the power transmission system solve the problems that the frequency stabilizing effect of each receiving end can not be ensured and the reasonable power modulation rate can not be allocated according to the actual situation of each receiving end in the prior art when a direct current power transmission system adopting a frequency control method is used for frequency stabilization. The method includes the steps that the difference of a preset frequency of a conventional direct current sending end and the current frequency of the conventional direct current sending end is obtained; according to the difference, the power modulation rate is generated, filtering is conducted on the power modulation rate to obtain a first modulation rate of a first flexible direct current receiving end, and a second modulation rate of a second flexible direct current receiving end is generated through the subtraction; according to the first modulation rate, the active power of the first flexible direct current receiving end is corrected, and according to the second modulation rate, the active power of the second flexible direct current receiving end is corrected. The method, the device and the power transmission system are used for hybrid direct current station control coordination control.

Description

technical field [0001] The invention relates to the technical field of transient stability control of an AC-DC power transmission system, in particular to a coordinated control method, device and power transmission system for hybrid DC station control. Background technique [0002] A multi-terminal DC transmission system refers to a transmission system consisting of more than three DC converter stations connected in series, parallel or hybrid. The multi-terminal DC transmission system can realize multi-source power supply and multi-drop power reception. With the increasing application of voltage source converters in the field of high-voltage direct current transmission, multi-terminal direct current transmission technology will be widely used in the fields of distributed renewable energy generation grid connection, high-voltage direct current distribution network, and flexible interconnection of large-scale AC power grids. . [0003] The DC transmission system adopts the fr...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24Y02E60/60
Inventor 张野洪潮杨健李俊杰
Owner CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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