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Situation-awareness-based frequency control method for wind power access-containing transmitting end system

A technology of system frequency and situational awareness, applied in wind power generation, reduction/prevention of power oscillation, single grid parallel feed arrangement, etc., can solve problems such as frequency coordination control methods that do not consider wind power and DC integrated power frequency characteristics, and achieve reliable Effects that control a wide range, improve stability, and increase recovery rates

Active Publication Date: 2019-06-14
SICHUAN UNIV
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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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  • Situation-awareness-based frequency control method for wind power access-containing transmitting end system
  • Situation-awareness-based frequency control method for wind power access-containing transmitting end system
  • Situation-awareness-based frequency control method for wind power access-containing transmitting end system

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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 situation-awareness-based frequency control method for a wind power access-containing transmitting end system. The frequency control method comprises the following steps thatthe situation awareness detection is carried out, wherein the power frequency characteristic situation information comprises the output Pw of a wind turbine generator, the output Pm of a firepower unit, direct-current external power PDC, a transmitting-end system internal load PLD and a rotary standby capacity Pr; the situation understanding is performed, wherein the frequency adjusting capability of the transmitting-end system, and the influence of the wind power permeability and the direct-current external power ratio on system frequency adjustment are judged; the situation prediction is carried out, wherein the current situation and the development change rule of the power frequency characteristic situation are summarized, the current situation information of the power frequency characteristic is presented, and the development change of the future situation is predicted; situation guiding is carried out, wherein when the frequency deviation over-limit or the dynamic response characteristic predicted by the transmitting-end system does not meet the requirements, the power frequency characteristic of the transmitting-end system is adjusted. According to the method, the system frequency recovery rate is increased, meanwhile, the system operation state and the development trend are mastered, frequency coordination control is carried out in advance, and the system stability is improved.

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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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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