本文關鍵詞：多時間尺度下考慮機組變槳動作優(yōu)化的風電場有功控制系統(tǒng)研究　出處：《南京理工大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 風電場 有功功率控制 變槳控制 轉速控制 有功分配 實時修正

【摘要】：隨著電網(wǎng)中風電滲透率的不斷提高,為了應對大規(guī)模風電接入給電網(wǎng)有功調(diào)度和安全穩(wěn)定運行帶來的巨大壓力和新的挑戰(zhàn),減小大規(guī)模風電并網(wǎng)對電力系統(tǒng)調(diào)頻、調(diào)度的不利影響,提高電網(wǎng)對風電的消納能力,有必要深入研究風電場的有功功率控制策略,充分發(fā)掘風電機組功率調(diào)節(jié)及參與電網(wǎng)輔助服務的能力。本文主要對風電場有功控制系統(tǒng)中的機組有功控制系統(tǒng)和風電場有功分配系統(tǒng)開展相關研究,具體工作如下:針對現(xiàn)有風電機組有功控制策略在高風速段會引起變槳系統(tǒng)頻繁動作的問題,本文提出了基于轉速與槳矩協(xié)調(diào)控制的改進有功控制策略,兼顧風電機組功率調(diào)節(jié)效果與運行工況。該方法充分利用風機具備的高轉速調(diào)節(jié)裕度,優(yōu)先通過調(diào)節(jié)風輪動能平衡風力機輸入/輸出的不平衡功率,從而能夠有效降低風機在全風速段的變槳動作頻率與幅度,減輕變槳機構疲勞,延長風機運行壽命,最后在Matlab/Simulink仿真平臺中驗證了所提新型風電機組有功功率控制策略的有效性。針對由風速波動和預測誤差所引起的風電場發(fā)電誤差的問題,本文在風電場有功控制系統(tǒng)中提出了基于多時間尺度的雙層有功分配控制框架,包括長時間尺度上的上層全局優(yōu)化分配策略和短時間尺度上的下層實時修正控制策略。其中,全局優(yōu)化分配策略綜合考慮場內(nèi)各機組的預測信息,運行狀態(tài)與控制特性等多方面影響因素,以風電場發(fā)電誤差最小、風機啟停次數(shù)最少和機組控制系統(tǒng)動作次數(shù)最小構建目標函數(shù),制定各機組的優(yōu)化調(diào)度指令,實現(xiàn)風電場經(jīng)濟運行;實時修正控制策略在全局優(yōu)化分配策略的基礎上,針對由風速波動及調(diào)度指令過高所引起的機組有功出力不足,利用具有功率調(diào)節(jié)裕度的機組來緩解風電場有功波動,實時調(diào)整機組的有功調(diào)度指令,進而提高風電場輸出功率的穩(wěn)定性與可靠性。最后,通過仿真算例對比對所提風電場有功分配策略的有效性進行了驗證。
[Abstract]:With the increasing permeability of wind power in the power grid, in order to cope with the huge pressure and new challenges brought by large-scale wind power access to the grid active power dispatching and safe and stable operation. It is necessary to study the active power control strategy of wind farm in order to reduce the adverse effect of large-scale wind power grid connection on power system frequency modulation and dispatch, and to improve the absorption ability of wind power grid. Fully explore the power regulation of wind turbines and the ability to participate in the auxiliary service of power grid. This paper mainly studies the active power control system of wind farm and the distribution system of active power in wind farm. The specific work is as follows: in view of the problem that the active power control strategy of the existing wind turbine will cause the variable propeller system to move frequently in the high wind speed, this paper proposes an improved active power control strategy based on the coordinated control of rotational speed and propeller moment. The method makes full use of the high speed adjustment margin of the fan and balances the unbalanced power of the wind turbine input / output by regulating the kinetic energy of the wind turbine. Thus it can effectively reduce the frequency and amplitude of the variable propeller movement of the fan in the whole wind speed section, reduce the fatigue of the propeller mechanism, and prolong the running life of the fan. Finally, the effectiveness of the proposed active power control strategy for wind turbine is verified on the Matlab/Simulink simulation platform. The wind farm power generation error caused by wind speed fluctuation and prediction error is analyzed. The question. In this paper, a two-layer active power distribution control framework based on multi-time scale is proposed in the active power control system of wind farm. It includes global optimal allocation strategy for long time scale and real-time modified control strategy for lower layer on short time scale, in which global optimal allocation strategy synthetically takes into account the prediction information of each unit in the field. The operation state and control characteristics are affected by the minimum power generation error of wind farm, the minimum number of fan start and stop and the minimum number of actions of the unit control system to construct the objective function, and to formulate the optimal dispatching instructions of each unit. To realize the economic operation of wind farm; Real-time modified control strategy on the basis of global optimal allocation strategy, due to the fluctuation of wind speed and the excessive dispatch command, the generating unit has insufficient active power output. The active power fluctuation of wind farm can be alleviated by using the unit with power regulation margin, and the active power dispatching instruction of the unit can be adjusted in real time, thus improving the stability and reliability of the output power of the wind farm. Finally. The effectiveness of the proposed active power allocation strategy for wind farms is verified by a simulation example.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM614

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