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Judgment method for access of double-fed fan to weak receiving end system through VSC-HVDC

A technology of VSC-HVDC and double-fed wind turbines, which is applied in the field of doubly-fed wind farms merged into weak AC systems, and can solve the problems of not giving the critical short-circuit ratio and not considering the situation of double-fed wind turbines, etc.

Active Publication Date: 2019-05-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing studies have not given the specific value of the critical short-circuit ratio, and have not considered the situation when the double-fed fan is used as a power generation device

Method used

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  • Judgment method for access of double-fed fan to weak receiving end system through VSC-HVDC
  • Judgment method for access of double-fed fan to weak receiving end system through VSC-HVDC
  • Judgment method for access of double-fed fan to weak receiving end system through VSC-HVDC

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Embodiment

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] Such as Figure 10 As shown, the present invention provides a method for judging that a double-fed fan is connected to a weak receiving end system via a VSC-HVDC, including the following steps:

[0050] Step 1: Through the expression of the relevant variables of the weakly affected system connected by VSC under the constant power control mode, the criterion of the constraint conditions to ensure the safe and stable operation of the system is proposed, and the critical operating point of the stable operation of the system can be obtained, and then the reactive power The calculation method of critical value and critical short circuit ratio.

[0051]Step 2: Build a mathematical model of using DFIG as the power generation device connected to the weak receiver system via VSC-HVDC, select a suitable control strategy, and point out that due ...

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Abstract

The invention relates to a judgment method for access of a double-fed fan to a weak receiving end system through VSC-HVDC, which is used for judging whether the double-fed fan can access the weak receiving end system through the VSC-HVDC or not. The method comprises the steps of 1) building a structure model for the access of the double-fed fan to the weak receiving end system through the VSC-HVDC; 2) determining a control mode of VSC; and 3) taking a critical short circuit ratio (CSCR) as a judgment index, and based on this, judging whether the double-fed fan can access the weak receiving endsystem through the VSC-HVDC or not. Compared with the prior art, the method has the advantages of comprehensive consideration, joint control, quantitative judgment and the like.

Description

technical field [0001] The invention relates to the integration of a VSC-HVDC double-fed wind farm into a weak AC system, in particular to a method for judging that a double-fed wind turbine is connected to a weak receiving end system via a VSC-HVDC. Background technique [0002] With the development of wind power generation technology, the problem of grid connection of wind farms via DC transmission has received extensive attention. The commutation voltage of the traditional direct current transmission technology (LCC-HVDC) is provided by the receiving end system during the grid connection process, which is prone to commutation failure, and the system has a large demand for reactive power. The flexible DC transmission technology (VSC-HVDC) based on voltage source converters does not require commutation voltage, can realize long-distance power transmission, and can be connected to weak receiving end systems or even passive networks. [0003] The strength of the receiving-en...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38
CPCY02E60/60
Inventor 边晓燕杜中浩邹黎明李东东周歧斌林顺富赵耀
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER