A control method and a device for connecting wind power to a flexible HVDC transmission system

A flexible DC and power transmission system technology, applied in circuit devices, wind power generation, power transmission AC networks, etc., can solve problems such as poor frequency modulation effect, short frequency modulation response time, and good frequency modulation effect

Active Publication Date: 2018-12-21
CHINA ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of low reliability, long frequency modulation response time and poor frequency modulation effect in the above-mentioned prior art, the present invention provides a control method and device for connecting wind power to a flexible direct current transmission system. The actual frequency of the AC bus on the wind farm side, the actual voltage of the DC side of the receiving end converter station, and determine the DC side reference voltage of the receiving end converter station according to the actual frequency of the receiving end AC grid; then based on the receiving end AC grid The actua

Method used

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  • A control method and a device for connecting wind power to a flexible HVDC transmission system
  • A control method and a device for connecting wind power to a flexible HVDC transmission system
  • A control method and a device for connecting wind power to a flexible HVDC transmission system

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Embodiment 1

[0099] Embodiment 1 of the present invention provides a control method for connecting wind power to a flexible direct current transmission system. The structure of a wind farm connected to a flexible direct current transmission system is as follows figure 1 as shown, figure 2 Among them, T1 represents the transformer between the wind farm and the sending-end converter station of the HVDC system, which is a step-up transformer, and T2 represents the transformer between the receiving-end converter station of the FHVDC system and the receiving-end AC grid, It is a step-down transformer; there are multiple doubly-fed induction generators in the wind farm, bus A is the AC bus on the wind farm side, bus B is the AC bus at the receiving end, C1 and C2 are the equivalent capacitance of the DC line, P F is the active power output by the wind farm, P S is the active power sent to the AC grid at the receiving end by the flexible HVDC transmission system, P L +jQ L It is a variable lo...

Embodiment 2

[0152] Based on the same inventive concept, Embodiment 2 of the present invention also provides a control device for connecting wind power to a flexible DC transmission system, wherein the flexible DC transmission system includes a sending-end converter station, a DC line, and a receiving-end converter station connected in sequence, The control device for connecting wind power to the flexible direct current transmission system provided by Embodiment 2 of the present invention includes an acquisition module, a determination module, and a control module. The functions of the above two modules are described in detail below:

[0153] The obtaining module is used to obtain the actual frequency of the AC power grid at the receiving end, the actual frequency of the AC busbar at the wind farm side, and the actual voltage at the DC side of the receiving end converter station;

[0154] The determination module therein is used to determine the DC side reference voltage of the receiving en...

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Abstract

The invention provides a control method and a device for connecting wind power to a flexible HVDC transmission system. Firstly, the actual frequency of an AC grid at a receiving end, the actual frequency of an AC bus bar at a wind farm side, the actual voltage at a DC side of a receiving end converter station are obtained, and the reference voltage at the DC side of the receiving end converter station is determined. Then, the voltage of DC line, the frequency of AC bus and the active power of wind farm are controlled separately, which has high reliability, short frequency modulation response time and good frequency modulation effect. Virtual synchronous machine droop control is adopted in the sending-end converter station, which improves the response speed of frequency regulation and shortens the time of frequency modulation. The frequency of the alternating current bus on the wind farm side is controlled by fixed frequency control or frequency conversion control, The active power of wind farm is controlled by virtual inertia, which makes the increased or decreased power released or supplemented in time when the flexible HVDC system provides frequency modulation for the receiving AC network, and reduces the risk of HVDC line voltage exceeding the limit, and greatly improves the reliability of HVDC system.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a control method and device for connecting wind power to a flexible direct current transmission system. Background technique [0002] As the installed capacity of wind farms increases, the proportion of wind power grid-connected to the entire grid capacity is also increasing, and the impact on the grid is also increasing. Long-distance large-scale wind farms can be integrated into the AC power grid at the receiving end through the flexible DC transmission system. In the power system, the rotors of synchronous motors and DC motors have rotational inertia and damping components, which contain a large amount of kinetic energy. When the power grid is disturbed or faulty, the rotor kinetic energy can be fully utilized to maintain the stability of the power grid. However, the flexible DC transmission system effectively decouples the direct connection betwe...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/36H02J3/48
CPCH02J3/386H02J3/36H02J3/48H02J2203/20Y02E10/76Y02E60/60
Inventor 杨晓楠郎燕生杨东冀赵昆李强孙博刘鹏王磊李静罗亚迪李理李森张振韩锋宋旭日王淼
Owner CHINA ELECTRIC POWER RES INST
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