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Hybrid DC feed-based power grid frequency control method

A grid frequency, hybrid DC technology, applied in the power transmission AC network, reducing/preventing power oscillation, etc., can solve problems such as large amount of measures and increase cost, reduce the amount of measures, reduce the amount of stability control measures, and improve economy. Effect

Inactive Publication Date: 2018-03-06
ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for thyristor-based conventional DC and flexible DC multi-infeed power grids, if only machine-cutting and load-cutting measures are taken, a large amount of measures is required, which increases the cost of system operation

Method used

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  • Hybrid DC feed-based power grid frequency control method

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Embodiment Construction

[0021] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0022] A schematic diagram of the structure of a power grid based on hybrid DC feed-in is shown in figure 1 As shown, the hybrid direct current fed into the power grid only includes conventional direct current based on thyristors and flexible direct current based on VSC (Voltage Source Converter: Voltage Source Converter), and there is no feed-in of other AC lines in the power grid. Such as figure 2 As shown, a grid frequency control method based on hybrid DC feed-in includes the following steps:

[0023] Step 1. Obtain the real-time power value transmitted by each DC line, and calculate the adjustable power size and range of each DC line accord...

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Abstract

The invention discloses a hybrid DC feed-based power grid frequency control method. The hybrid DC feed-based power grid frequency control method comprises the steps of 1, acquiring a power value transmitted in real time by each DC circuit, and calculating the size and the range of the power which can be regulated by each DC circuit; 2, judging whether a blocking fault occurs in the DC circuit or not, if yes, executing the step 3; 3, judging whether a frequency after the fault can be limited within a reasonable range or not by DC frequency limitation control according to an off-line strategy, if yes, directly starting the DC frequency limitation control, otherwise starting the DC frequency limitation control and entering the step 4; 4, calculating active support capability of a flexible DCsystem, judging whether the frequency after the fault can be limited within the reasonable range or not by the active support capability of the flexible DC system, if yes, starting the active supportcapability of the flexible DC system and ending, otherwise starting the active support capability of the flexible DC system and entering the step 5; and 5, maintaining a stable power grid frequency byremoving a load or a unit by stable control.

Description

technical field [0001] The invention relates to a grid frequency control method based on hybrid DC feed-in. Background technique [0002] With the rapid economic growth, the demand for electricity is getting higher and higher, and the distribution of energy and electricity consumption in our country is uneven. Places with dense energy tend to have low demand for electricity, while areas with dense loads are extremely scarce in energy. Therefore, the long-distance, high-voltage direct current transmission system has been developed rapidly under this background, which provides a solution to alleviate the problem of uneven energy distribution. Multi-circuit DC transmission can transmit electric energy efficiently, but in areas with dense loads, with the continuous enhancement of the grid structure and the continuous feeding of a large number of power sources, the problem of excessive short-circuit current has become another problem that plagues these economically developed area...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/24H02J3/36Y02E60/60
Inventor 林成陈锐欧阳可凤马覃峰王寅刘明顺
Owner ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD
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