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A DC current feedback AC voltage control method for flexible DC transmission systems

A technology of flexible DC and control methods, applied in the direction of power transmission AC network, etc., can solve the problems of passive network voltage stability, etc., to improve stability and anti-interference ability of DC system, improve response speed and anti-interference ability, Guaranteed normal operation

Active Publication Date: 2018-08-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the DC system disturbance in the AC voltage controller of the flexible direct current transmission system affects the voltage stability of the passive network, and improve the response speed and anti-interference ability of the AC side voltage controller to the DC system disturbance

Method used

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  • A DC current feedback AC voltage control method for flexible DC transmission systems
  • A DC current feedback AC voltage control method for flexible DC transmission systems
  • A DC current feedback AC voltage control method for flexible DC transmission systems

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, it is the equivalent structure diagram of a two-level voltage source converter station supplying power to the passive network. In the figure, 1 is the passive network load, 2 is the converter transformer, u s is the AC side voltage of the passive network access point, 3 is the filter, 4 is the coupling reactor, i s is the AC side current of the converter station, u c is the AC side voltage of the converter station, 5 is the voltage source converter valve, 6 is the DC side capacitor of the converter station, U d is the DC side voltage of the converter station, I d is the DC side current flowing into the converter station.

[0029] Such as figure 2 As shown, it is the AC side voltage controller proposed in this embodiment, and the DC side current I flowing into the converter station is introduced into the AC side voltage controller d Positive feedback, passing the DC current through a certain feedback gain K d and K q They are respective...

Embodiment 2

[0032] In this embodiment, the voltage source converter station that supplies power to the passive network is as follows: figure 1 As shown, the corresponding model is established in the electromagnetic transient simulation software PSCAD / EMTDC, and its basic parameters are as follows:

[0033] Rated voltage U of the DC side of the converter station d0 The DC side capacitance is 5000μF, the rated power of the converter station is 100MW, the equivalent inductance of the converter station coupling reactor is 0.053H, and the equivalent resistance is 0.8Ω. The converter transformer adopts Yn / △ connection method, and the leakage reactance is 0.1pu. The transformation ratio is 20kV / 60kV, the passive network adopts inductance and resistance simulation, which are 0.01H and 30Ω respectively, and the rated voltage is 20kV.

[0034] Since one of the most important manifestations of DC system disturbance is the fluctuation of DC current, the fluctuation will first cause the voltage fluct...

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Abstract

The invention provides a DC feedback-based AC voltage control method for a flexible DC transmission system. The control method comprises the steps as follows: a DC side current I<d> of a voltage source converter is introduced into an AC voltage controller; and an AC voltage of the voltage source converter is controlled by superposing feedback gains K<d> and K<q> of the DC side current I<d> into a d-axis component and a q-axis component of a PWM modulation signal respectively, so that the response speed and the anti-jamming capability of the AC voltage controller on DC system disturbance are improved. The influence on the AC side voltage of the voltage source converter and a passive network voltage caused by the DC system disturbance can be effectively suppressed by only increasing measurement and positive feedback of a DC of the voltage source converter; the stability of the passive network voltage and the capability of resisting DC system interference are greatly improved; and normal operation of a passive network load is ensured.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission control technology for supplying power to a passive network, and in particular relates to an alternating voltage control method for a flexible direct current transmission system with direct current feedback. Background technique [0002] With its technical advantages such as passive inverter, good power quality, and no need for reactive power support, flexible DC transmission technology has become one of the important technical means to solve passive network power supply such as remote islands and urban center distribution networks. In order to ensure the normal operation of the passive network, the voltage source converter must adopt AC side voltage control to provide it with stable AC side voltage and power support. Since the voltage source converter is the medium between the DC system and the passive network, and the power comes from the DC system, the stability of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 刘开培饶雪杨洁秦亮冉晓洪
Owner WUHAN UNIV
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