A Breadth-First Based Restoration Path Generation Method for HVDC Converter Stations
A technology of DC converter station and recovery path, applied in the direction of AC network circuits, circuit devices, electrical components, etc., can solve the problems of less system power supply, slow start-up speed, affecting the power grid load recovery speed, etc., to ensure safety and stability. The effect of speeding up the recovery process
Inactive Publication Date: 2017-11-14
NANJING UNIV OF SCI & TECH +3
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Problems solved by technology
Due to the characteristics of large-scale conventional generating units, especially thermal power units, there are deficiencies such as slow start-up speed, long start-up time, slow power increase rate, start-up impact of auxiliary machines, etc., resulting in less system power in the initial stage of black start, which affects the speed of power grid load recovery
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[0134] Take New England 10 machines and 39 nodes as an example:
[0135] Set node 31 as a pumped storage power plant, as a black start power supply, with an installed capacity of 3×200MW and a power factor of 0.9, K CB =0.45, the maximum reactive power that the no-load generator can absorb is 0.3S N . Set the power supply connected to node 39 as a DC converter station, and the minimum starting power P dc Take 105MW, the minimum filter bank capacity Q filter It is 60MVA; the other parameters of the power supply to be restored are shown in Table 1; the start-up time of the transmission line and the transformer branch is set to be 5 minutes.
[0136] Table 1 Startup parameters to be restored
[0137]
[0138] Step 1: Combine the unit to be restored and the node 39 of the DC converter station to form the power supply to be restored, and the black start power supply node 31 to join the restored small system S 1 , initialize S 1 current moment t 1 = 0;
[0139] Step 2, co...
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The invention discloses a breadth-first direct-current converter station recovery path generation method with the purpose that the recovery time of a direct-current converter station is the shortest, a local optimal power transmission path of a power supply to be recovered is searched based on a Dijkstra shortest path method, and the recovery path of the direct-current converter station is optimized based on a breadth-first method. The method comprises the steps of: 1, utilizing the Dijkstra algorithm to search for the shortest path from a live-line system to the power supply to be recovered; 2, carrying out technical verification on the power supply to be recovered and the recovery path thereof, wherein the content of the technical verification includes machine set start time and start power constraint, reactive and self excitation constraint, load flow and node voltage constraint and direct current start condition constraint; and 3, based on the breadth-first principle, searching for the power supply to be recovered, and optimizing the recovery path of the direct-current converter station. According to the invention, with the purpose of the shortest recovery time of the direct-current converter station, the direct-current converter station is preferentially started, and large-capacity of active power can be provided for the subsequent recovery of a failed power grid, and the recovery process of a power-off system is accelerated.
Description
technical field [0001] The invention belongs to the field of power system analysis and control, in particular to a method for generating a recovery path of a DC converter station based on breadth priority. Background technique [0002] In recent years, many large-scale power outages have occurred successively around the world (such as the blackout in the United States and Canada in August 2003, the blackout in Hainan in September 2005, the blackout in Western Europe in November 2006, and the blackout in July 2012). Indian power outage, etc.), has caused huge economic losses and social impacts to various countries. Therefore, in addition to preventing blackouts through reliable technical support and scientific and rigorous production management, the power sector must also quickly and effectively restart the power supply and restore power to the grid after the blackout, so as to control the accident loss within within the minimum range. [0003] In the current grid black-sta...
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IPC IPC(8): H02J3/00
CPCH02J3/0073
Inventor 谢云云郑冉林莎许辉石屹岭夏方涛殷明慧邹云周前刘建坤汪成根
Owner NANJING UNIV OF SCI & TECH