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Method for improving reliability of extra-high voltage direct current access power system with wind power uncertainty

A UHV DC and power system technology, applied to AC networks with the same frequency from different sources, wind power generation, power transmission AC networks, etc. Solve problems such as large numbers, and achieve the effect of improving operational reliability

Active Publication Date: 2021-05-14
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large-scale application of wind power and the high proportion of UHV access will affect the reliability of the power system. For example, wind power has output uncertainty, and UHV DC failures will lead to a shortage of power supply. Safe Operations Bring Challenges
[0003] At present, the reliability analysis of the UHV DC connected power system is complicated, the dimension of the solution is large, and the problem is difficult to solve, and there are currently a large number of wind power connected to the receiving end power system, which further increases the importance of the reliability analysis of the receiving end power system

Method used

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  • Method for improving reliability of extra-high voltage direct current access power system with wind power uncertainty
  • Method for improving reliability of extra-high voltage direct current access power system with wind power uncertainty
  • Method for improving reliability of extra-high voltage direct current access power system with wind power uncertainty

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Embodiment

[0160] The present invention analyzes and judges the reliability of the 24-node power system, and the topological structure of the 24-node is as follows: figure 2 As shown, where node 17 contains the converter station, nodes 18, 21, 22, etc. contain generator sets, and nodes 1, 16, and 23 contain wind turbines. The original load of the power system is 2500MW; the Weibull distribution scale parameter c and shape parameter k are 7 and 2 respectively; the cut-in wind speed, cut-off wind speed and rated wind speed are 3m / s, 20m / s, and 13.5m / s. The maximum number of available converters is 4; the insufficient power supply is selected as the reliability analysis index (the smaller the value, the better); 5 different scenarios are selected to analyze the reliability. The UHV DC connection capacity and wind power connection capacity of different proportions are shown in Table 1:

[0161]

[0162]

[0163] The reliability analysis results of the above five scenarios are as foll...

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Abstract

The invention discloses a method for improving the reliability of an extra-high voltage direct current access power system with wind power uncertainty. The method comprises the following steps: simulating cumulative probability distribution of wind speed by using a Weibull distribution model; processing the cumulative probability distribution of the wind speed to obtain simulated wind speed, and obtaining wind power generation output; obtaining an alternating current-direct current coupling equation containing a current converter; determining a node power balance model of a node where the converter is located; establishing an optimal scheduling model by using an AC / DC coupling equation containing the converter and a node power balance model of the node where the converter is located; enabling the optimal scheduling model to carry out model solving according to wind power generation output, the number of available converters and the available condition of a generator set to obtain the load reduction amount, calculating the power supply insufficiency according to the load reduction amount, and improving the reliability of the power system according to the power supply insufficiency. According to the method, reliability analysis is effectively carried out on the extra-high voltage direct current and wind power integrated power system, and effective measures are taken to ensure reliable operation of the power system.

Description

technical field [0001] The invention relates to a method for improving the reliability of a power system, in particular to a method for improving the reliability of an UHV DC connected power system based on the number of converters and considering the uncertainty of wind power. Background technique [0002] At present, with the increasingly prominent problems of energy, environment, and climate change, the development of renewable energy has become a new trend in the world's energy development; in addition, the eastern economic region of my country is poor in resources, but the demand for electric energy is increasing day by day, and UHV inter-regional power transmission has become a solution The top priority of the power region's unbalanced contradictions. However, the large-scale application of wind power and the high proportion of UHV access will affect the reliability of the power system. For example, wind power has output uncertainty, and UHV DC failures will lead to a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/36H02J3/06H02J3/48H02J3/50
CPCH02J3/381H02J3/466H02J3/36H02J3/06H02J3/48H02J3/50H02J2203/10H02J2203/20H02J2300/28H02J2300/40H02J2300/20Y02E60/60Y02E10/76
Inventor 项中明殷伟斌吴一峰徐立中张思陶欢杨晓雷丁磊明唐律李洋梁梓杨丁一
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO
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