含TCSC電力系統(tǒng)暫態(tài)穩(wěn)定分析
發(fā)布時間：2019-06-20 14:46
【摘要】：近年來,隨著電力需求的增長,電網(wǎng)負(fù)荷強(qiáng)度提高,電力系統(tǒng)的暫態(tài)穩(wěn)定問題日益突出,如何提高電力系統(tǒng)的暫態(tài)穩(wěn)定性已成為一個急待解決的問題。為滿足遠(yuǎn)距離大容量電力輸送,以及新能源發(fā)電并網(wǎng)的要求,可控串聯(lián)補(bǔ)償器(ThyristorControlledSeries Compensation,簡稱TCSC)等基于電力電子技術(shù)的靈活交流輸電(Flexible AC TransmissionSystem,簡稱FACTS)元件在電力系統(tǒng)中的應(yīng)用日益增加,為電力系統(tǒng)暫態(tài)穩(wěn)定分析提出了新的研究課題。TCSC是一種串聯(lián)在交流輸電線路中的阻抗補(bǔ)償裝置,它通過晶閘管快速控制來實(shí)現(xiàn)阻抗的大范圍連續(xù)調(diào)節(jié),是一種典型的串聯(lián)型FACTS技術(shù)。利用TCSC可以提高功率輸送能力、抑制功率振蕩以及提高暫態(tài)穩(wěn)定性等,為遠(yuǎn)距離輸電提供了技術(shù)手段,已取得若干實(shí)際應(yīng)用。在研究TCSC的動態(tài)行為及其對電力系統(tǒng)的影響方面,目前的主要方法包括時域仿真法和直接法,這兩種方法均存在一些困難,如時域模型的準(zhǔn)確建立、有效的仿真方法、能量函數(shù)的構(gòu)造等都有待深入研究。本文的主要工作如下:(1)建立了含TCSC的電力系統(tǒng)數(shù)學(xué)模型,包括同步發(fā)電機(jī)模型、負(fù)荷靜態(tài)模型、網(wǎng)絡(luò)結(jié)構(gòu)保留模型和TCSC控制模型。(2)針對單機(jī)無窮大系統(tǒng)及多機(jī)系統(tǒng)分別完成了含TCSC電力系統(tǒng)的潮流計算及時域仿真計算。(3)闡述了含TCSC的電力系統(tǒng)在網(wǎng)絡(luò)結(jié)構(gòu)保留模型下的能量函數(shù)構(gòu)造。詳細(xì)介紹了能量函數(shù)構(gòu)造的方法與步驟,證明了 TCSC靜態(tài)模型能量函數(shù)的單調(diào)下降特性。對考慮動態(tài)TCSC模型的單機(jī)及多機(jī)電力系統(tǒng)能量函數(shù)進(jìn)行了運(yùn)算,通過其導(dǎo)數(shù)的非正特性表明其能量構(gòu)造的正確性。計算結(jié)果表明,TCSC能抑制系統(tǒng)振蕩并提高系統(tǒng)暫態(tài)穩(wěn)定性。本文提出的考慮TCSC靜態(tài)特性的能量函數(shù)滿足單調(diào)下降要求�？紤]TCSC動態(tài)的能量函數(shù)法暫態(tài)穩(wěn)定性分析仍需進(jìn)一步研究。
[Abstract]:In recent years, with the increase of power demand and the increase of power grid load intensity, the transient stability of power system is becoming more and more prominent. How to improve the transient stability of power system has become an urgent problem to be solved. In order to meet the requirements of long distance and large capacity power transmission and grid connection of new energy generation, the application of flexible AC transmission (Flexible AC TransmissionSystem, (FACTS) elements based on power electronics technology, such as controllable series compensator (TCSC), is increasing day by day in power system, which puts forward a new research topic for transient stability analysis of power system. TCSC is a kind of impedance compensation device in series in AC transmission line. It realizes the continuous regulation of impedance in a wide range through the rapid control of thyristor, which is a typical series FACTS technology. The use of TCSC can improve the power transmission capacity, suppress the power oscillation and improve the transient stability, which provides a technical means for long-distance transmission, and has made some practical applications. In the study of the dynamic behavior of TCSC and its influence on power system, the main methods include time domain simulation method and direct method, both of which have some difficulties, such as the accurate establishment of time domain model, effective simulation method, the construction of energy function and so on. The main work of this paper is as follows: (1) the mathematical model of power system with TCSC is established, including synchronous generator model, load static model, network structure retention model and TCSC control model. (2) the power flow calculation and time domain simulation of power system with TCSC are completed for single machine infinite bus system and multi-machine system, respectively. (3) the energy function construction of power system with TCSC under network structure retention model is described. The method and steps of constructing energy function are introduced in detail, and the monotone decline characteristic of energy function of TCSC static model is proved. The energy function of single machine and multi-machine power system considering dynamic TCSC model is calculated, and the correctness of its energy structure is shown by the non-positive characteristics of its derivative. The calculation results show that TCSC can suppress the system oscillation and improve the transient stability of the system. In this paper, the energy function considering the static characteristics of TCSC meets the monotone decline requirement. The transient stability analysis of TCSC dynamic energy function method still needs to be further studied.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712
本文編號：2503300
[Abstract]:In recent years, with the increase of power demand and the increase of power grid load intensity, the transient stability of power system is becoming more and more prominent. How to improve the transient stability of power system has become an urgent problem to be solved. In order to meet the requirements of long distance and large capacity power transmission and grid connection of new energy generation, the application of flexible AC transmission (Flexible AC TransmissionSystem, (FACTS) elements based on power electronics technology, such as controllable series compensator (TCSC), is increasing day by day in power system, which puts forward a new research topic for transient stability analysis of power system. TCSC is a kind of impedance compensation device in series in AC transmission line. It realizes the continuous regulation of impedance in a wide range through the rapid control of thyristor, which is a typical series FACTS technology. The use of TCSC can improve the power transmission capacity, suppress the power oscillation and improve the transient stability, which provides a technical means for long-distance transmission, and has made some practical applications. In the study of the dynamic behavior of TCSC and its influence on power system, the main methods include time domain simulation method and direct method, both of which have some difficulties, such as the accurate establishment of time domain model, effective simulation method, the construction of energy function and so on. The main work of this paper is as follows: (1) the mathematical model of power system with TCSC is established, including synchronous generator model, load static model, network structure retention model and TCSC control model. (2) the power flow calculation and time domain simulation of power system with TCSC are completed for single machine infinite bus system and multi-machine system, respectively. (3) the energy function construction of power system with TCSC under network structure retention model is described. The method and steps of constructing energy function are introduced in detail, and the monotone decline characteristic of energy function of TCSC static model is proved. The energy function of single machine and multi-machine power system considering dynamic TCSC model is calculated, and the correctness of its energy structure is shown by the non-positive characteristics of its derivative. The calculation results show that TCSC can suppress the system oscillation and improve the transient stability of the system. In this paper, the energy function considering the static characteristics of TCSC meets the monotone decline requirement. The transient stability analysis of TCSC dynamic energy function method still needs to be further studied.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712
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