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A Coordinated Control Method for Wind Farm-Flexible DC Transmission System to Improve the Inertia Level of Power System

A flexible DC and power system technology, applied in power transmission and AC networks, etc., can solve problems such as difficulty in using wind energy, and achieve the effect of improving the level of inertia and improving system reliability.

Active Publication Date: 2015-09-23
YUNNAN POWER GRID
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Problems solved by technology

Morren et al. proposed to use the grid frequency deviation to modify the active reference of DFIG value, but this method is only used for the AC power grid, and it is difficult to use the wind energy transmission system through VSC-HVDC

Method used

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  • A Coordinated Control Method for Wind Farm-Flexible DC Transmission System to Improve the Inertia Level of Power System
  • A Coordinated Control Method for Wind Farm-Flexible DC Transmission System to Improve the Inertia Level of Power System
  • A Coordinated Control Method for Wind Farm-Flexible DC Transmission System to Improve the Inertia Level of Power System

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Embodiment Construction

[0043] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Such as Figure 5 As shown, a wind farm-flexible DC transmission system cooperative control method to improve the inertia level of the power system, the control method uses the DC bus capacitance and DFIG rotor kinetic energy to simulate the inertia of the synchronous generator. Under grid disturbance, GSVSC first controls the DC voltage slip to make the DC capacitor absorb or release energy accordingly. Then, after the WFVSC senses the fluctuation of the DC voltage, it converts the changing DC voltage into a changing frequency signal of the AC system on the wind farm side through frequency conversion control. In this way, the manual coupling of the offshore and onshore AC systems is realized, and the communication between the converter stations a...

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Abstract

The invention discloses a cooperative control method for a wind power plant and a flexible direct current transmission system for improving an inertial level of a power system. The control method is used for simulating the inertia of a synchronous generator by virtue of a direct-current capacitor and the kinetic energy of a DFIG (Doubly Fed Induction Generator) rotor. The cooperative control method comprises the steps that a GSVSC (Grid-Side Voltage Source Converter) enables the direct-current capacitor to correspondingly absorb or release energy through the slip frequency control on a direct-current voltage under the disturbance of a power grid; then, a WFVSC (Wind Field Voltage Source Converter) converts the changed direct-current voltage into a wind field side alternating-current system change frequency signal through frequency conversion control after feeling the fluctuation of the direct-current voltage, so that a maritime alternating-current system and a shore alternating-current system are artificially coupled, and the communication between convertor stations at two ends is omitted; finally, a power instruction value is adjusted by a DFIG power controller in order to respond to the frequency change of the WFVSC, and the rotating speed of the rotor is also correspondingly changed. Through a series of cooperative control, a maritime wind field takes part in the frequency adjustment of a power system so as to play an important significance to the introduction of a large maritime wind field.

Description

technical field [0001] The invention belongs to the technical field of offshore wind power generation, and in particular relates to a coordinated control method of a wind farm-flexible direct current transmission system that improves the inertia level of a power system. Background technique [0002] VSC-HVDC (flexible direct current transmission system) is a typical structure for long-distance large-scale offshore wind power grid integration. Compared with the grid-connected traditional DC transmission system, VSC-HVDC can independently adjust the output active and reactive power, and provide voltage support capabilities for passive and island systems such as offshore wind power. [0003] The point-to-point flexible DC transmission system is connected by the converter stations at both ends through the submarine DC cable. Among them, WFVSC (wind farm side converter station) mainly collects the energy generated by DFIG (double-fed induction wind generator), while GSVSC (grid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 徐政李宇骏刘昇刘莉芸薛英林游广增
Owner YUNNAN POWER GRID
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