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Direct current transmission system and generator set joint frequency modulation starting method

A technology for DC transmission systems and generator sets, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of aggravating the transmission end power, the influence of the frequency stability of the transmission end, and the imbalance of the transmission end of the DC transmission system, so as to avoid frequent switching, Improve economy and improve the effect of bus frequency instability

Active Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0003] Due to the random change of wind speed, the change of wind power has volatility and uncertainty. The large fluctuation of wind power will lead to the imbalance of active power at the sending end of the DC transmission system; and the current DC transmission system is generally in a constant power or constant current mode. The transmission power remains basically constant during operation, which is equivalent to a constant load. In this mode, the power imbalance at the sending end is exacerbated, which affects the frequency stability at the sending end.

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  • Direct current transmission system and generator set joint frequency modulation starting method
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Embodiment Construction

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0028] The present invention provides a starting method for combined frequency regulation of a direct current transmission system and a generating set, and the specific steps are as follows:

[0029] (1) Real-time detection of the bus frequency f of the transmission end of the AC system, and obtain the frequency deviation Δf; where the frequency deviation Δf=f-f 0 , f 0 50Hz power frequency.

[0030] (2) Determine the start-up mode of the DC transmission system according to the frequency deviation Δf, including the high-frequency start-up mode and the low-frequency start-up mode; if the frequency deviation Δf>0, the DC transmission system and the generator set adopt the high-frequency start-up mode; if the frequency deviation Δf< 0, the DC transmission system and the gener...

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Abstract

The invention provides a direct current transmission system and generator set joint frequency modulation starting method. A direct current transmission system and a generator set are started according to the frequency deviation delta f of an alternating-current system to realize joint frequency modulation, wherein the starting comprises the high-frequency starting mode and the low-frequency starting mode; if the frequency deviation delta f is greater than zero, then direct current transmission system and the generator set are started in the high-frequency starting mode; and if the frequency deviation delta f is less than zero, then the direct current transmission system and the generator set are started in the low-frequency starting mode. Compared with the prior art, according to the direct current transmission system and generator set joint frequency modulation starting method provided in the invention, the primary frequency modulation capability of the generator set and the modulation function of the direct current transmission system are utilized comprehensively, the problem that a lot of spare capacity needs to be increased when frequency modulation is performed by only relying on the generator set can be avoided, and at the same time, the power changing amount of the direct current transmission system is limited through coordination frequency control, so frequent switching of the direct-current two-end alternating-current filter can be avoided, so that the economy of the direct current transmission system can be improved.

Description

technical field [0001] The invention relates to the field of electric power system stability control, in particular to a starting method for joint frequency regulation of a direct current transmission system and a generating set. Background technique [0002] Wind energy is currently the most economical new energy that is widely used. Northwest China is rich in wind power resources, but due to the reverse distribution of energy and load in my country, the current development of wind power energy in Northwest China is mainly focused on large-scale centralized access, long-distance transmission, and large-scale consumption. Similar to the situation in Northwest China, there is also a demand for wind power and thermal power to be sent out at the same time in wind power and coal power-intensive areas such as northern my country and northeastern China. The above-mentioned wind power and thermal power energy bases are more than 2000km away from the eastern and central load centers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 葛俊郭小江施学谦韩奕孙玉娇王雅婷高超张玉红
Owner STATE GRID CORP OF CHINA
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