Frequency control method of sending-end system with wind power access based on situational awareness

A system frequency and situational awareness technology, applied in wind power generation, reducing/preventing power oscillation, single grid parallel feeding arrangement, etc. The effect of fast speed, improved stability, and increased recovery rate

Active Publication Date: 2021-05-04
SICHUAN UNIV
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  • Application Information

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Problems solved by technology

[0038] Frequency coordination control method for AC / DC sending end system with wind farm access without considering the comprehensive power-frequency characteristics of wind power and DC

Method used

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  • Frequency control method of sending-end system with wind power access based on situational awareness
  • Frequency control method of sending-end system with wind power access based on situational awareness
  • Frequency control method of sending-end system with wind power access based on situational awareness

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Embodiment Construction

[0073] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] 1. Situation awareness

[0075] Situational awareness refers to the detection and acquisition of important elements and information of the perceived object, which is the basis of situational awareness technology, and its results can be used to prepare for situational understanding and prediction of power-frequency characteristics. Combined with the wide-area measurement system, the main information for situational awareness of power-frequency characteristics includes wind turbine output P w , Firepower unit output P m , DC external power P DC , The internal load P of the sending end system LD and the spinning reserve capacity P r Wait.

[0076] The DC output power is relatively fixed within the dispatch cycle and is easy to detect, and the traditional load in the sending-end system can be roughly judged according to the da...

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Abstract

The invention discloses a method for controlling the frequency of a sending-end system including wind power access based on situational awareness, which includes the following steps: situational awareness: the information of situational awareness of power-frequency characteristics includes wind turbine output P w , Firepower unit output P m , DC external power P DC , The internal load P of the sending end system LD and the spinning reserve capacity P r ; Situation understanding: Judging the frequency adjustment capability of the sending end system, and the impact of wind power penetration rate and DC output power ratio on the system frequency adjustment; Situation prediction: Summarizing the status quo and development rules of the power-frequency characteristics situation, showing the The current situation information of power frequency characteristics, and the prediction of future development and changes of the situation; situational guidance: when the frequency deviation predicted by the sending end system exceeds the limit or the dynamic response characteristics do not meet the requirements, adjust the power frequency characteristics of the sending end system. The invention improves the recovery rate of the system frequency, and at the same time grasps the operating state and development trend of the system, performs frequency coordination control in advance, and improves the system stability.

Description

technical field [0001] The invention relates to the technical field of frequency control of a sending-end system, in particular to a method for controlling the frequency of a sending-end system including wind power access based on situational awareness. Background technique [0002] 1. Power-frequency characteristics of the sending system [0003] Under the condition of ignoring the network active power loss of the wind power DC sending end system, the frequency is at the rated value f during normal operation of the system 0 , then there is [0004] P G =P m +P w =P D =P LD +P DC (1) [0005] In the formula: P G Indicates the output power of the generator set; P m and P w Respectively represent the output of the thermal power unit and the wind power unit; P D Indicates the load demand power of the sending end system, including the traditional load P LD and DC output power P DC . [0006] When the active power balance of the system is destroyed and the frequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/46
CPCY02E10/76
Inventor 艾青刘天琪印月江琴李保宏
Owner SICHUAN UNIV
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