【摘要】：隨著大區(qū)域互聯(lián)電網(wǎng)的不斷發(fā)展,電網(wǎng)的安全穩(wěn)定運(yùn)行面臨新的挑戰(zhàn),因此對電力系統(tǒng)暫態(tài)穩(wěn)定分析方法有了更高要求。同時(shí),隨著廣域測量系統(tǒng)的不斷興起,為電力系統(tǒng)暫態(tài)穩(wěn)定分析方法提供了新思路和新方向。本文基于廣域測量信息,研究了電力系統(tǒng)暫態(tài)穩(wěn)定的在線識(shí)別與決策分析方法,主要工作如下:(1)研究了簡單系統(tǒng)和多機(jī)系統(tǒng)暫態(tài)穩(wěn)定過程的動(dòng)態(tài)特性,對其失穩(wěn)機(jī)理和穩(wěn)定性判據(jù)進(jìn)行了深入分析;(2)提出了一種改進(jìn)的最小二乘支持向量機(jī)回歸算法,能夠利用廣域測量信息預(yù)測系統(tǒng)中各發(fā)電機(jī)的功角變化軌跡,與已有算法相比,預(yù)測時(shí)間和預(yù)測精度均有明顯改善;(3)基于擾動(dòng)后功角軌跡離散程度的變化規(guī)律,提出了利用相空間重構(gòu)后子序列之間的標(biāo)準(zhǔn)差偏差作為暫態(tài)穩(wěn)定的判據(jù),并構(gòu)建了一種新的基于響應(yīng)的電力系統(tǒng)暫態(tài)穩(wěn)定預(yù)測方法,能夠更早地判斷出系統(tǒng)的穩(wěn)定性狀況。基于IEEE標(biāo)準(zhǔn)算例進(jìn)行了仿真驗(yàn)證,結(jié)果表明本文所提方法的有效性和準(zhǔn)確性。本文方法可用于電網(wǎng)參數(shù)不詳或模型不準(zhǔn)情況下電力系統(tǒng)暫態(tài)穩(wěn)定性的快速準(zhǔn)確識(shí)別。
[Abstract]:With the continuous development of large-scale interconnected power grid, the safe and stable operation of power network is facing new challenges, so there is a higher demand for power system transient stability analysis method. At the same time, with the rising of wide-area measurement system, it provides a new idea and new direction for power system transient stability analysis. Based on the wide-area measurement information, the on-line identification and decision analysis method of power system transient stability is studied in this paper. The main work is as follows: (1) the dynamic characteristics of transient stability process of simple system and multi-machine system are studied. The instability mechanism and stability criterion are analyzed in depth. (2) an improved least square support vector machine regression algorithm is proposed, which can predict the power angle change trajectory of every generator in the system by using wide-area measurement information, compared with the existing algorithms. The prediction time and prediction accuracy are improved obviously. (3) based on the variation rule of the power angle trajectory dispersion after disturbance, the standard deviation between the sub-sequences after phase space reconstruction is proposed as the criterion of transient stability. A new power system transient stability prediction method based on response is proposed, which can judge the stability of power system earlier. The simulation results based on IEEE standard show that the proposed method is effective and accurate. This method can be used to identify the transient stability of power system with unknown parameters or model uncertainty.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM712

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本文編號(hào)：2193323