VSC-HVDC system control method based on proportional resonance controller

A VSC-HVDC, proportional resonance technology, applied in the field of new inverter control strategies, can solve problems such as low system robustness

A VSC-HVDC, proportional resonance technology, applied in the field of new inverter control strategies, can solve problems such as low system robustness

CN110350565APending Publication Date: 2019-10-18STATE GRID TIANJIN ELECTRIC POWER +1
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  • VSC-HVDC system control method based on proportional resonance controller
  • VSC-HVDC system control method based on proportional resonance controller
  • VSC-HVDC system control method based on proportional resonance controller

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Embodiment Construction

[0026] On the basis of the advantages and disadvantages of the existing VSC-HVDC control technology, the present invention proposes an inner loop current control strategy based on a proportional resonance controller. The advantages of decoupling control, on the other hand, by introducing a proportional resonant controller, it realizes no static error tracking for the AC signal of a specified frequency, and the control model in the αβ coordinate system has no cross-coupling items, realizing accurate decoupling.

[0027] VSC-HVDC overall control system such as figure 1 As shown, the new control strategy proposed by the present invention aims at figure 1 Active power control, reactive power control and DC voltage control design in.

[0028] (1) Outer loop controller active and reactive power controller

[0029] like figure 2 The indicated current reference value i sdref i sqref That is, the active and reactive power transmitted between the AC grid and the VSC-HVDC can be ad...

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Abstract

The invention relates to a VSC-HVDC system control method based on a proportional resonance (PR) controller. A double-closed-loop structure is adopted, and the control mode is in a PQ control mode ora UQ control mode; when the PQ control mode is adopted, the outer loop is an active outer loop and a reactive outer loop; when the UQ control mode is adopted, the outer loop is a voltage outer loop and a reactive outer loop, and the outer loops adopt a combination of a proportional integral controller and feedforward control, and the outer loop provides a current reference value to the inner loop;the inner loop is a current loop, and the controller of the inner loop adopts the proportional resonance controller, and provides a modulation voltage reference value for the corresponding modulationstrategy. According to the method, the complete decoupling of the active power and the reactive power of the inner loop is achieved, and the advantages of high response speed, high control precisionand the accurate decoupling of the inner loop current are achieved.

Description

technical field [0001] The invention relates to the technical field of flexible high-voltage direct current transmission, in particular to a novel converter control strategy. Background technique [0002] VSC-HVDC can independently control active and reactive power transmission, can supply power to weak AC power grid and passive system without inter-station communication, the polarity of DC voltage remains unchanged when the power flow is reversed, and the low-order harmonic content of output voltage is reduced, etc. features. Therefore, VSC-HVDC is especially suitable for grid connection of large-scale wind power generation, urban power supply and asynchronous AC grid interconnection and other occasions. At present, the control strategies for the VSC-HVDC system are mainly divided into indirect control and direct control. Indirect control is to achieve the control goal by controlling the amplitude and phase angle of the voltage fundamental wave on the AC side of the VSC. ...

Claims

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Application Information

Patent Timeline
18 Oct 2019
Publication
CN110350565A
IPC
H02J3/36; H02J3/24
CPC
H02J3/36; H02J3/24; Y02E60/60
Inventors
李静远; 马春晓