本文關(guān)鍵詞：基于二維一階伴隨系統(tǒng)的電網(wǎng)暫態(tài)穩(wěn)定在線分析與控制　出處：《天津大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電力系統(tǒng) 廣域測(cè)量系統(tǒng) 暫態(tài)穩(wěn)定 功角穩(wěn)定 暫態(tài)能量函數(shù) 緊急控制

【摘要】：隨著我國大規(guī)模交直流混聯(lián)電力系統(tǒng)的不斷建設(shè)和發(fā)展,依靠離線數(shù)據(jù)或者SCADA/EMS數(shù)據(jù)實(shí)現(xiàn)暫態(tài)穩(wěn)定分析與控制的方法,已經(jīng)難以滿足實(shí)際電網(wǎng)的運(yùn)行需求。而廣域測(cè)量系統(tǒng)(WAMS)的投入使用,為暫態(tài)穩(wěn)定分析和控制帶來了新技術(shù)手段。本文提出了將二維一階伴隨系統(tǒng)理論與WAMS實(shí)時(shí)數(shù)據(jù)相結(jié)合,實(shí)現(xiàn)暫態(tài)穩(wěn)定分析與緊急控制的新思路。論文首先系統(tǒng)地介紹了二維一階伴隨系統(tǒng)的理論基礎(chǔ),并分析了其基于WAMS系統(tǒng)實(shí)現(xiàn)穩(wěn)定性分析的適用性。在此基礎(chǔ)上,提出了基于數(shù)值微分求導(dǎo)方法的二維一階伴隨系統(tǒng)的在線計(jì)算方法,以及在線暫態(tài)穩(wěn)定分析與緊急控制的實(shí)現(xiàn)架構(gòu),為后文工作提供了理論依據(jù)和計(jì)算方法。提出了將二維一階伴隨系統(tǒng)和WAMS系統(tǒng)相結(jié)合的暫態(tài)穩(wěn)定在線識(shí)別方法。該方法定義考慮多擺穩(wěn)定的最小投影動(dòng)能,并提出對(duì)應(yīng)的暫態(tài)穩(wěn)定判據(jù)。為了給緊急控制系統(tǒng)預(yù)留更多的時(shí)間,提出利用最小二乘擬合技術(shù)預(yù)測(cè)系統(tǒng)軌跡并進(jìn)行穩(wěn)定性預(yù)判。所提方法不受系統(tǒng)模型參數(shù)和網(wǎng)絡(luò)拓?fù)溆绊?無需識(shí)別臨界機(jī)群和計(jì)算故障后系統(tǒng)穩(wěn)定平衡點(diǎn),僅需采集發(fā)電機(jī)運(yùn)行數(shù)據(jù)即可進(jìn)行穩(wěn)定性判別。建立了伴隨凹軌道系統(tǒng)的數(shù)學(xué)模型,并利用該系統(tǒng)提出了暫態(tài)穩(wěn)定性在線識(shí)別的新方法�；谖⒎謳缀螌W(xué)的曲率概念實(shí)現(xiàn)在線監(jiān)測(cè)系統(tǒng)運(yùn)行點(diǎn)和預(yù)測(cè)穩(wěn)定邊界,在此基礎(chǔ)上提出了失穩(wěn)預(yù)測(cè)判據(jù)。該系統(tǒng)與二維一階伴隨系統(tǒng)互為映射,因此,具備其在穩(wěn)定性分析中的諸多優(yōu)點(diǎn)。此外,該方法在預(yù)測(cè)邊界時(shí)能避免因回?cái)[點(diǎn)附近強(qiáng)非線性而導(dǎo)致預(yù)測(cè)失效的問題,并且無需調(diào)節(jié)觀測(cè)和預(yù)測(cè)窗口。提出了一種電力系統(tǒng)暫態(tài)穩(wěn)定性在線分析的分區(qū)-合成方法,并設(shè)計(jì)了利用WAMS數(shù)據(jù)實(shí)現(xiàn)大電網(wǎng)分層分區(qū)在線監(jiān)控的系統(tǒng)框架。利用所提分區(qū)-合成理論,各區(qū)域系統(tǒng)僅需傳遞二維一階伴隨系統(tǒng)的特征量即可實(shí)現(xiàn)快速、準(zhǔn)確判斷全系統(tǒng)的暫態(tài)穩(wěn)定性。因此,所提方法能夠有效提高實(shí)際系統(tǒng)穩(wěn)定分析數(shù)據(jù)的傳輸效率并降低系統(tǒng)數(shù)據(jù)的存儲(chǔ)空間。提出了基于伴隨凹軌道系統(tǒng)的電力系統(tǒng)實(shí)時(shí)閉環(huán)緊急控制方法。該方法利用發(fā)電機(jī)組失穩(wěn)排序指標(biāo)選取失穩(wěn)機(jī)組,基于凹軌道失穩(wěn)裕度來估計(jì)緊急控制切機(jī)量。所提方法能夠在不依賴離線故障策略表的條件下實(shí)現(xiàn)在線緊急控制,此外,該方法將失穩(wěn)機(jī)群識(shí)別和穩(wěn)定性判別過程相解耦,提高了實(shí)時(shí)緊急控制策略在實(shí)際電力系統(tǒng)中的計(jì)算效率和實(shí)用性。
[Abstract]:With the continuous construction and development of large-scale AC / DC hybrid power systems in China, transient stability analysis and control methods depend on off-line data or SCADA/EMS data. It has been difficult to meet the operational requirements of the actual power grid, and WAMS (wide area Measurement system) has been put into use. This paper presents a new technique for transient stability analysis and control. In this paper, the theory of two-dimensional first-order adjoint system is combined with WAMS real-time data. A new approach to transient stability analysis and emergency control is presented. Firstly, the theoretical basis of two-dimensional first-order adjoint system is systematically introduced. The applicability of stability analysis based on WAMS system is analyzed. Based on this, an on-line calculation method of two-dimensional first-order adjoint system based on numerical differential derivation method is proposed. And the implementation framework of on-line transient stability analysis and emergency control. This paper provides the theoretical basis and calculation method for the later work. A method of on-line transient stability identification is proposed, which combines two-dimensional first-order adjoint system with WAMS system. This method defines the minimum projective kinetic energy considering multi-pendulum stability. . The corresponding transient stability criterion is proposed to reserve more time for the emergency control system. The least square fitting technique is used to predict the trajectory of the system and to predict the stability of the system. The proposed method is independent of the system model parameters and network topology, and does not need to identify critical cluster and calculate the stable equilibrium point of the system after failure. Only the generator operation data can be collected to judge the stability, and the mathematical model of the system with concave track is established. Based on the curvature concept of differential geometry, the on-line monitoring system running point and predicting stability boundary are realized. On this basis, the instability prediction criterion is proposed. The system is mapped to two-dimensional first-order adjoint system, so it has many advantages in stability analysis. This method can avoid the problem of prediction failure caused by strong nonlinearity near the return pendulum point when predicting the boundary. Without adjusting the observation and prediction window, a zone-composition method for on-line analysis of power system transient stability is proposed. And design the system frame of using the WAMS data to realize the on-line monitoring and control of the large power network, and use the theory of zonation and composition mentioned above. Each region system only needs to transfer the characteristic quantity of 2-D first-order adjoint system to realize fast and accurately judge the transient stability of the whole system. The proposed method can effectively improve the transmission efficiency of system stability analysis data and reduce the storage space of system data. A real-time closed-loop emergency control method for power system based on concave track system is proposed. The unstable unit is selected by using the unsteady ranking index of the generator set. The proposed method can realize the on-line emergency control without relying on the off-line fault policy table based on the stability margin of the concave track. The method decouples the identification of unstable cluster and the stability identification process, and improves the calculation efficiency and practicability of real-time emergency control strategy in practical power system.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM712
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本文編號(hào)：1378752