Security and stability control and defense method for power grid
A stable control and power grid security technology, applied in the direction of electrical components, emergency protection circuit devices, etc., can solve problems such as overload of low-voltage tie lines, achieve the effects of eliminating overload, improving power supply capacity, and saving money
Inactive Publication Date: 2011-04-27
NR ELECTRIC CO LTD +2
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[0004] The main purpose of the present invention is to solve the regional power grid connected to the large regional power grid through tie lines of different voltage levels. The load is transferred to the low-voltage tie-line, resulting in serious overload of the low-voltage tie-line, so as to ensure the safe and stable operation of the power grid
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[0033] Taking Huzhou regional power grid as an example, the present invention provides a technical solution for power grid security and stability control and defense system, including the following steps:
[0034] (1) According to the grid structure and load flow distribution of regional grids connected by tie lines of different voltage levels, analyze possible stability problems;
[0035] The electrical connection between Huzhou regional power grid and Zhejiang main grid is relatively weak, and it is mainly connected with the main system through 4 circuits, namely: 500kV Wangdian-Hanshan double-circuit line, 220kV Pingyao-Moliang single-circuit line (Pingmo 2238 ), 220kV Pingyao ~ Shilin single-circuit line (Pinglin 2444). Among the above four lines, the 500kV Wangdian-Hanshan double-circuit line is erected on the same tower with a total length of about 38 kilometers. In the event of a double-circuit failure between Wangdian and Hanshan on the same tower, all the power trans...
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The invention discloses a security and stability control and defense method for a power grid. The method comprises the following steps of: 1) analyzing possible stability problems according to the power grid structure of a regional power grid connected through contact circuits of different voltage levels and the load tide distribution condition; 2) determining a stable control system scheme after the regional power grid has an accident according to the magnitude of actual load tide of the contact circuits, and reasonably setting arrangement points of a main station and sub stations of stability control devices; 3) organizing channel contacts among the stability control devices of the stations after the arrangement points of the main station and the sub stations of the stability control devices are determined to realize information exchange and stability control measures among the stability control devices of the stations; and 4) mainly considering a control measure for residual low-voltage level contact circuit overload caused when switching power between the regional power grids is high and after the high-voltage level contact circuit fails in security and stability control and defense, wherein the control measure is to cut off partial load in the regional power grid. The method ensures security and stability control operation of the power grid by taking the measures of quickly cutting off the load and the hot backup contact circuits.
Description
technical field [0001] The invention belongs to the field of electric power automation technology control, and in particular relates to a grid stability control technology under the condition that a fault trip of the tie line leads to interruption of a part of the power supply channel for regional power grids connected by tie lines of different voltage levels. Background technique [0002] At present, because the primary structure of some regional power grids is not perfect and reasonable, the power used is mainly obtained from the main grid system through multiple contact lines, and the power supply channel is relatively single. With the continuous development of economy and society, users' demand for power is also increasing , the size of the transmission capacity of the contact line has become the bottleneck of the power supply capacity in this type of area. The current solution to this type of problem and improve the transmission and distribution capacity is to build a ne...
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Inventor 朱炳铨倪秋龙方天宇王函韵唐明吴鸣鸣夏尚学徐柯任祖怡
Owner NR ELECTRIC CO LTD