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Control method for flexible direct-current power transmission system

A technology of flexible direct current transmission and control method, which is applied in the direction of electric power transmission AC network, etc., can solve the problems of poor anti-interference ability of PI control, large overshoot, and difficult to meet high performance of PI regulator, and achieve strong self-adaptive adjustment ability , Improve the effect of anti-interference ability

Inactive Publication Date: 2015-11-04
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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AI Technical Summary

Problems solved by technology

PI control has poor anti-interference ability, large overshoot, and PI parameters are not easy to adjust
For a strongly coupled, nonlinear system such as VSC-HVDC, it is difficult for the PI regulator to meet the high performance requirements of the system

Method used

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  • Control method for flexible direct-current power transmission system
  • Control method for flexible direct-current power transmission system
  • Control method for flexible direct-current power transmission system

Examples

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Embodiment Construction

[0031] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0032] like figure 1 As shown, the flexible direct current transmission system of the present invention includes:

[0033] The AC system 1 is connected with the reactor 2 .

[0034] Reactor 2 is connected with AC system 1 and rectifier 3 .

[0035] The rectifier 3 is connected with the reactor 2 and the capacitor 4, and is used for converting the alternating current of the alternating current system 1 into direct current.

[0036] Capacitor 4 is used to stabilize the DC voltage and provide DC voltage support for the rectifier and converter.

[0037] The direct current transmission line 5 is used for direct current power transmission.

[0038] The capacitor 6 is connected with the direct curre...

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Abstract

The present invention discloses a control method for a flexible direct-current power transmission system. The flexible direct-current power transmission system is composed of an alternating current system, an electric reactor, a current rectifier, a capacitor, a direct current power transmission circuit, an inverter and a load, wherein both the current rectifier and the inverter use three-phase bridge-type circuits. The current rectifier adopts the control method, based on shuffled frog leaping algorithm (SFLA) optimized active disturbance rejection controller (ADRC) provided by the present invention, the method adopts dual close-loop vector control, and an outer voltage loop adopts SFLA optimized ADRC control so as to stabilize direct current voltage while an inner loop adopts current decoupling control to realize decoupling of active power and reactive power. According to the method, ADRC parameter adjustment can be performed on line according to system operation states, the self-adaption adjustment capability is good, and the anti-jamming capability of the system is raised.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, and more specifically relates to a control method for a flexible direct current transmission system. Background technique [0002] With the development of power electronics technology, high-voltage direct current transmission (VSC-HVDC) based on voltage source converters (VSC-HVDC), that is, flexible direct current transmission, has become a research hotspot. VSC-HVDC not only fundamentally solves the defects of traditional high-voltage direct current transmission (HVDC) , also has the unparalleled advantages of traditional HVDC, mainly as follows: (1) VSC-HVDC system can independently control active power and reactive power, and the control is more flexible and convenient; (2) VSC-HVDC can work in passive inverter (3) VSC can dynamically compensate the reactive power of the AC bus and stabilize the voltage of the AC bus; (4) VSC-HVDC can , The magnitude of the DC voltage at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 薛敏郑惠萍宋述勇张悦段伟文杨尉薇刘新元郝鑫杰曲莹王玮茹
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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