【摘要】：電力系統(tǒng)暫態(tài)穩(wěn)定評(píng)估—直是關(guān)系到電力系統(tǒng)安全穩(wěn)定運(yùn)行的重要問題。隨著可再生能源及大量電力電子裝備的接入,區(qū)域電網(wǎng)互聯(lián)規(guī)模不斷擴(kuò)大,使電力系統(tǒng)的調(diào)度運(yùn)行方式和安全穩(wěn)定控制面臨嚴(yán)峻考驗(yàn),需研究滿足當(dāng)前運(yùn)行狀態(tài)且有利于復(fù)雜電網(wǎng)調(diào)度的暫態(tài)穩(wěn)定評(píng)估在線分析方法。本文主要從彈球損失支持向量機(jī)和端口能量函數(shù)法暫態(tài)穩(wěn)定評(píng)估兩方面進(jìn)行分析,主要研究內(nèi)容如下:(1)針對(duì)傳統(tǒng)支持向量機(jī)在進(jìn)行電力系統(tǒng)暫態(tài)穩(wěn)定評(píng)估時(shí),易受系統(tǒng)臨界穩(wěn)定干擾樣本的影響問題。提出一種基于彈球損失支持向量機(jī)的暫態(tài)穩(wěn)定評(píng)估模型。首先,采用系統(tǒng)指標(biāo)和投影能量函數(shù)指標(biāo)構(gòu)建暫態(tài)穩(wěn)定指標(biāo)的原始特征集,通過最大相關(guān)最小冗余特征選擇方法對(duì)暫態(tài)指標(biāo)集進(jìn)行特征壓縮,尋找對(duì)電網(wǎng)暫態(tài)變化敏感度高的特征子集;然后,基于彈球損失支持向量機(jī)思想將特征子集映射到高維空間,實(shí)現(xiàn)非線性暫態(tài)穩(wěn)定評(píng)估問題的線性轉(zhuǎn)化,進(jìn)而引入分位數(shù)改變系統(tǒng)穩(wěn)定類與不穩(wěn)定類之間的最近點(diǎn)位置,將暫態(tài)穩(wěn)定分類問題轉(zhuǎn)化為在彈球損失支持向量機(jī)中尋找最優(yōu)分位數(shù)距離問題,以減小系統(tǒng)臨界穩(wěn)定干擾樣本的影響,提高電力系統(tǒng)暫態(tài)評(píng)估方法的評(píng)估準(zhǔn)確率和穩(wěn)定性。(2)針對(duì)傳統(tǒng)能量函數(shù)構(gòu)造易受系統(tǒng)模型影響,當(dāng)網(wǎng)絡(luò)拓?fù)涓淖儠r(shí)需要重新構(gòu)造能量函數(shù)問題。提出一種基于端口能量函數(shù)法的暫態(tài)穩(wěn)定評(píng)估模型。將端口能量描述為端口狀態(tài)變量和控制變量的函數(shù),進(jìn)而借助端口能量表征VSC-HVDC系統(tǒng)的暫態(tài)能量聚集效應(yīng),以避免VSC-HVDC內(nèi)部復(fù)雜控制過程的建模,降低能量函數(shù)的構(gòu)造難度,且可擴(kuò)展到網(wǎng)絡(luò)中任意含電力電子器件的端口;進(jìn)一步,構(gòu)建基于端口能量的全系統(tǒng)能量函數(shù),通過迭代勢能邊界面法(iteration potential energy boundary surface,IPEBS)進(jìn)行暫態(tài)穩(wěn)定評(píng)估,借助點(diǎn)積判據(jù)確定系統(tǒng)失穩(wěn)時(shí)間,在系統(tǒng)失穩(wěn)的轉(zhuǎn)子運(yùn)動(dòng)軌跡上搜索勢能最大值作為臨界能量,確定極限切除時(shí)間,實(shí)現(xiàn)暫態(tài)穩(wěn)定的快速判別。
[Abstract]:Power system transient stability assessment is an important problem related to the safe and stable operation of power system. With the access of renewable energy and a large number of power electronic equipment, the scale of regional power grid interconnection is expanding, which makes the dispatching operation mode and safety and stability control of power system face a severe test. It is necessary to study the on-line transient stability assessment method which satisfies the current operation state and is beneficial to complex power grid dispatching. In this paper, the loss support vector machine and the port energy function method for transient stability evaluation are analyzed. The main contents are as follows: (1) traditional support vector machine is used to evaluate the transient stability of power system. The problem of vulnerability to critical stability disturbance samples of the system. A transient stability evaluation model based on loss support vector machine (SVM) is proposed. Firstly, the original feature set of transient stability index is constructed by system index and projection energy function index, and the feature compression of transient index set is carried out by the method of maximum correlation and minimum redundancy feature selection. Looking for the feature subset with high sensitivity to the transient change of power network; Then, the feature subset is mapped to high dimensional space based on the idea of loss support vector machine (SVM). The linear transformation of nonlinear transient stability assessment problem is realized, and the quantile is introduced to change the position of the nearest point between the system stability class and the unstable class. In order to reduce the influence of critical stability disturbance samples, the transient stability classification problem is transformed into finding the optimal quantile distance in the ball-loss support vector machine. To improve the accuracy and stability of power system transient evaluation methods. (2) for the traditional energy function construction is vulnerable to the system model, when the network topology changes need to reconstruct the energy function problem. A transient stability evaluation model based on port energy function method is proposed. The port energy is described as a function of the port state variable and the control variable, and then the transient energy aggregation effect of the VSC-HVDC system is represented by the port energy to avoid the modeling of the complex control process in the VSC-HVDC. It reduces the difficulty of constructing the energy function and can be extended to any port containing power electronic devices in the network. Furthermore, the energy function of the whole system based on port energy is constructed. The transient stability is evaluated by iterative potential energy boundary surface method (iteration potential energy boundary surface,IPEBS). The point product criterion is used to determine the instability time of the system. The maximum potential energy as the critical energy is searched on the rotor trajectory of the unstable system, and the limit cutting time is determined to realize the fast identification of transient stability.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM712

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本文編號(hào)：2402174