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Wind power dispersion and integration droop control method based on VSC-HVDC

A technology of VSC-HVDC and control method, which is applied in the field of wind power decentralized grid-connected droop control based on VSC-HVDC, and achieves the effect of high reliability and reasonable dynamic distribution of reliability

Inactive Publication Date: 2015-06-24
WUHAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this connection mode, strategies such as the above-mentioned DC voltage droop control are no longer effective

Method used

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  • Wind power dispersion and integration droop control method based on VSC-HVDC
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  • Wind power dispersion and integration droop control method based on VSC-HVDC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] by figure 2 The single wind farm shown is connected to the grid through the VSC-HVDC transmission system, and its system parameters are shown in Table 1. The parameters of each PI controller are determined according to the system capacity and line parameters, as shown in Table 2.

[0079] Table 1. System parameters of grid-connected single wind farm

[0080]

[0081]

[0082] Table 1, L f1 , R f1 and C f1 are the filter inductance, filter resistor and filter capacitor on the wind farm side; L f2 , R f2 and C f2 Respectively, the filter inductance, filter resistor and filter capacitor of the distribution network side; R 1 / L 1 , R 2 / L 2 and R 3 / L 3 Respectively figure 2 Middle line impedance Z 1 ,Z 2 and Z 3 resistance and inductance; R ld / L ld for figure 2 Mid-sea island load Z ld resistance and inductance; P ld for figure 2 Load power at the distribution network side; and are the rated values ​​of the voltage at the common connectio...

Embodiment 2

[0097] by Figure 5 The single wind farm shown in the example uses the VSC-HVDC system to supply distributed power to distribution networks in three different regions as an example to verify the correctness and effectiveness of the control strategy of the present invention in the case of decentralized multi-terminal power supply for wind farms. Among them, the load and impedance parameters at both ends of the system are shown in Table 3, and the other system parameters and control parameters are the same as the above calculation example.

[0098] Table 3 System parameters of decentralized multi-terminal grid connection of wind farms

[0099] R 1 (Ω)

L 1 (mH)

R 2 (Ω)

L 2 (mH)

R 3 (Ω)

0.04

0.02

0.08

0.04

0.16

L 3 (mH)

R ld1 (Ω)

L ld1 (mH)

R ld2 (Ω)

L ld2 (mH)

0.08

62.5

25

37.5

20

R ld3 (Ω)

L ld3 (mH)

P ld1 (MW)

P ld2 (MW)

P ld3 (MW) ...

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Abstract

The invention discloses a wind power dispersion and integration droop control method based on the VSC-HVDC. The method includes the steps that first, a VSC-HVDC system structure model for single wind power plant integration is established; second, a constant DC voltage controller for a power distribution network side inverter of the VSC-HVDC system structure model is established; third, an AC voltage droop controller for a wind power plant side rectifier of the VSC-HVDC system structure model is established; fourth, the VSC-HVDC system structure model for multiple-wind-power-plant integration in an AC dispersion mode at the sending end is established according to power distribution network distribution, the power distribution network side inverter is controlled by the constant DC voltage controller, and the wind power plant side rectifier is controlled by the AC voltage droop controller. According to the wind power dispersion and integration droop control method based on the VSC-HVDC, an effective solution can be provided for dispersion wind power plant joint coordination operation in an AC converging mode at the receiving end, and the method is suitable for remote wind power plant integration control.

Description

technical field [0001] The invention belongs to the technical field of wind power grid-connected control, and in particular relates to a VSC-HVDC-based wind power decentralized grid-connected droop control method. Background technique [0002] Due to the extremely rich wind power resources and relatively mature technology, the installed capacity of wind power in the world has been increasing in recent years, and there has been a gradual development trend from land to offshore. With the large-scale development and utilization of offshore wind power, AC transmission is increasingly unable to fully meet the demand due to technical bottlenecks such as system synchronization, transmission stability, and transmission efficiency. In order to solve the problem of long-distance grid connection of large-scale offshore wind power, flexible direct current transmission (VSC-HVDC) technology based on voltage source converters is widely used. Its transmission capacity is not limited by dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02A30/60Y02E10/76
Inventor 廖清芬田园园刘涤尘邹宏亮彭思成
Owner WUHAN UNIV
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