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

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...

AI Technical Summary

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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