Two-stage random optimization scheduling method for AC-DC interconnected power grid

An interconnected power grid, random optimization technology, applied in the direction of AC network circuit, power transmission AC network, AC network load balancing, etc., can solve problems such as unfavorable system economic security and so on

Pending Publication Date: 2020-07-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Thirdly, due to the uncertainty of the source load, the DC power will be adjusted in real time, causing the readjustment of the reactive power equipment, which is not conducive to the economic security of the system operation

Method used

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  • Two-stage random optimization scheduling method for AC-DC interconnected power grid
  • Two-stage random optimization scheduling method for AC-DC interconnected power grid
  • Two-stage random optimization scheduling method for AC-DC interconnected power grid

Examples

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Embodiment 1

[0135] A wind power DC transmission system in Northwest China is used for testing and analysis. The transmission system contains 15 equivalent nodes, and the receiving system contains 39 equivalent nodes. The specific structure diagram of the transmission and reception systems is as follows: figure 2 , image 3 shown. Both the wind farm and the energy storage are located at the No. 4 node of the sending system. The charging and discharging efficiencies of the energy storage are both 0.9, and the upper and lower limits of SOC are 0.95 and 0.05, respectively. The sending-end system and the receiving-end system are connected through the HVDC tie line, and the converter stations are respectively located at node 5 of the sending-end system and node 32 of the receiving-end system. The DC rated power is 8000MW, the maximum number of DC daily adjustments is 8 times, the number of DC continuous periods is 2, the maximum and minimum DC power adjustment rates are 1000MW and 100MW respe...

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PUM

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Abstract

The invention discloses a two-stage random optimization scheduling method for an AC-DC interconnected power grid, which comprises the following steps: decomposing a sending end power grid wind power,load and DC power comprehensive curve into a trend component and a fluctuation component through an H-P filtering decomposition method, introducing energy storage stabilization penalty, and stabilizing the fluctuation component under the condition of meeting an energy storage operation constraint condition; comparing the energy storage stabilization result of the real-time operation with the energy storage stabilization result of the day-ahead operation, and if a deviation exists between the real-time stabilization result and the day-ahead stabilization result, performing punishment so as to reduce the influence of fluctuation component uncertainty; and reasonably arranging the planned value of reactive power equipment, and reserving a margin for real-time adjustment of the direct currentpower. It is guaranteed that real-time adjustment of the direct current power does not cause change of the planned value of the reactive power equipment any more, and the system safety is improved.

Description

technical field [0001] The invention belongs to the field of power system operation and dispatching, and relates to a two-stage random optimization dispatching method for an AC / DC interconnected power grid considering energy storage to stabilize fluctuations. Background technique [0002] At present, my country is vigorously developing new energy represented by wind power. However, most of the large-scale wind power bases are located in the inland areas of Northwest China, where the local load level is low and it is difficult to absorb them locally. Therefore, the transmission of wind power across regions through HVDC transmission has become an important way to promote wind power consumption. [0003] Due to the volatility and uncertainty of wind power and load, in order to cope with these characteristics, the output of thermal power units has to be frequently adjusted, and sufficient reserve capacity for upward adjustment and downward adjustment has been reserved, which has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/46H02J3/24H02J3/28H02J3/00G06Q10/06G06Q50/06
CPCH02J3/36H02J3/46H02J3/24H02J3/28H02J3/008G06Q10/06312G06Q50/06H02J2003/365Y02E10/76Y02E60/60Y02E70/30
Inventor 张海波申杰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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