發(fā)布時間：2018-10-23 17:00

【摘要】：隨著我國巨型風電基地的規(guī)劃建設(shè),將會有更多大規(guī)模風場接入電網(wǎng),主要采取“風火打捆”的形式將風電送出消納�！帮L火打捆”外送系統(tǒng)運行方式多變,電網(wǎng)的頻率和電壓特性影響因素多且影響關(guān)系復雜。風電功率波動下的火電機組調(diào)頻控制策略,變電站SVC和可控高抗電壓控制策略制定難度較大。因此研究“風火打捆”外送系統(tǒng)網(wǎng)源之間的相互協(xié)調(diào)具有重要意義。 本文分析了風電機組控制模型和火電機組控制模型的基本結(jié)構(gòu),建立了一個具有典型意義的“風火打捆”仿真分析系統(tǒng),比較了超臨界機組和亞臨界機組控制特性差異,深入分析了固速風機在電網(wǎng)短路故障下發(fā)生轉(zhuǎn)速失穩(wěn)被過速保護切除的機理。以甘肅河西電網(wǎng)中一個同時包含風電和火電的外送地區(qū)為實例,分析了該地區(qū)與主網(wǎng)發(fā)生解列故障時火電機組一次調(diào)頻特性、OPC反復動作原因及應對策略。針對風機群體性脫網(wǎng)故障,提出了一種緊急提升火電機組功率的系統(tǒng)頻率控制策略,通過監(jiān)測風機脫網(wǎng)量和火電機組有效旋轉(zhuǎn)備用量,計算火電機組的緊急提升功率量,將機組CCS由正常AGC控制切換為緊急提升功率的控制,實現(xiàn)減小系統(tǒng)頻率波動幅度、提高頻率穩(wěn)定性的效果,該策略的效果通過仿真進行了驗證。分析了酒泉風電場和疆電外送一、二通道配置的FACTS裝置類型和工作原理,基于風機脫網(wǎng)故障的仿真,研究了FACTS裝置對于抑制電壓波動的效果,并對酒泉風電基地配套規(guī)劃的大型火電機組在加強勵磁系統(tǒng)抑制風機脫網(wǎng)時電壓波動效果方面提出了配置建議。
[Abstract]:With the planning and construction of the giant wind power base in China, more large-scale wind fields will be connected to the power grid, and the wind power will be sent out and absorbed mainly in the form of "wind and fire bundles". The operation mode of "wind and fire bundling" outgoing transmission system is changeable, and the frequency and voltage characteristics of power network are affected by many factors and the influence relationship is complex. It is difficult to formulate the frequency modulation control strategy of thermal power unit under the fluctuation of wind power, substation SVC and controllable high robust voltage control strategy. Therefore, it is of great significance to study the coordination between the network sources of wind and fire bundles. In this paper, the basic structure of wind turbine control model and thermal power unit control model is analyzed, a typical simulation analysis system of "wind and fire bundling" is established, and the difference of control characteristics between supercritical unit and subcritical unit is compared. In this paper, the mechanism of the speed instability of the fixed speed fan is removed by overspeed protection under the short circuit fault of the power network. Taking an outgoing area of Hexi power grid in Gansu province as an example, the primary frequency modulation characteristic of thermal power unit, the cause of repeated action of OPC and the countermeasures are analyzed when there is a break-up fault between this area and the main network. In view of the fan group breakaway fault, a system frequency control strategy is proposed to increase the power of thermal power unit urgently. By monitoring the amount of fan detachable and the effective rotating reserve of thermal power unit, the emergency lifting power of thermal power unit is calculated. The CCS of the unit is switched from normal AGC control to emergency lifting power control to reduce the frequency fluctuation amplitude of the system and to improve the frequency stability. The effect of the strategy is verified by simulation. This paper analyzes the type and working principle of the FACTS device configured by Jiuquan wind farm and Xinjiang electricity outputting, and studies the effect of the FACTS device on restraining voltage fluctuation based on the simulation of fan detachable fault. Some suggestions on how to strengthen the excitation system to restrain the voltage fluctuation when the fan is off the grid are put forward for the large thermal power units which are planned for Jiuquan wind power base.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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