【摘要】：隨著現(xiàn)代電力系統(tǒng)的不斷發(fā)展和“西電東送,全國聯(lián)網(wǎng)”的電力發(fā)展戰(zhàn)略進(jìn)一步推進(jìn),大規(guī)模交直流互聯(lián)輸電逐步成為我國電網(wǎng)發(fā)展的基本格局,由此帶來的交直流電力系統(tǒng)暫態(tài)穩(wěn)定問題日益突出;另一方面,基于電壓源的新型直流輸電應(yīng)用規(guī)模不斷擴(kuò)大,使得系統(tǒng)受擾后的動態(tài)過程更為復(fù)雜�；诖吮尘�,本文在總結(jié)傳統(tǒng)高壓直流輸電和新型直流輸電系統(tǒng)基本原理與控制模型的基礎(chǔ)上,對交直流并聯(lián)輸電系統(tǒng)的暫態(tài)運行特性與優(yōu)化控制相關(guān)問題進(jìn)行了深入研究,為交直流系統(tǒng)運行和調(diào)制提供了一定的參考。首先,本文基于等面積原理分析了直流線路接入對交直流暫態(tài)功角穩(wěn)定裕度的影響機(jī)理。以系統(tǒng)穩(wěn)定裕度為指標(biāo)綜合分析了直流過載能力、系統(tǒng)初始功角、故障切除時間以及功率分配等因素對系統(tǒng)暫態(tài)穩(wěn)定的影響,并提出了直流線路改善混聯(lián)系統(tǒng)穩(wěn)定性的有效作用域,通過MATLAB/Simulink仿真驗證了分析結(jié)果。其次,針對多機(jī)交直流系統(tǒng)存在的各機(jī)組功角軌跡不同調(diào)及電磁功率時變性等特殊問題,提出一種用互補機(jī)群等值功角的相對運動來評價系統(tǒng)整體功角穩(wěn)定裕度的分析方法�；诨パa機(jī)群慣量中心變換提出一種以等值功角同調(diào)指數(shù)為性能指標(biāo)的同調(diào)機(jī)群劃分策略,并通過仿真驗證了該方法的可行性。然后,針對交直流系統(tǒng)故障后的暫態(tài)穩(wěn)定問題,采用直流功率調(diào)制技術(shù)對系統(tǒng)故障特性進(jìn)行優(yōu)化控制以改善系統(tǒng)的暫態(tài)穩(wěn)定性。在分析直流功率調(diào)制改善系統(tǒng)暫態(tài)穩(wěn)定性的基礎(chǔ)上,提出了基于兩種功率調(diào)制的優(yōu)化策略。對于直流大方式調(diào)制,采用prony辨識方法確定其輸入信號源,提出基于等值功角同調(diào)指數(shù)的變步長分層尋優(yōu)參數(shù)優(yōu)化策略;對于直流功率提升/回降調(diào)制,考慮調(diào)制參數(shù)與等面積原理中加減速面積密切相關(guān)以及多變量非線性的特點,采用基于不平衡能量性能指標(biāo)的粒子群優(yōu)化算法對調(diào)制策略進(jìn)行優(yōu)化。最后通過MATLAB與BPA暫態(tài)仿真驗證了兩種優(yōu)化策略的有效性,優(yōu)化后的調(diào)制策略能夠有效改善系統(tǒng)功角穩(wěn)定性,為實際工程中的直流功率調(diào)制策略提供一定的參考。
[Abstract]:With the continuous development of modern power system and the development strategy of "power transmission from west to east, national interconnection", large-scale AC / DC interconnection has gradually become the basic pattern of power grid development in China. The transient stability of AC / DC power system is becoming more and more serious. On the other hand, the application scale of new HVDC transmission based on voltage source is expanding, which makes the dynamic process of the system more complicated. Based on this background, on the basis of summarizing the basic principle and control model of the traditional HVDC transmission system and the new HVDC transmission system, the transient operation characteristics of the AC / DC parallel transmission system and the problems related to the optimization control are deeply studied in this paper. It provides a certain reference for the operation and modulation of AC / DC system. Firstly, based on the principle of equal area, the influence mechanism of DC line access on AC / DC transient power angle stability margin is analyzed. The effects of DC overload capacity, system initial power angle, fault removal time and power distribution on the transient stability of the system are analyzed synthetically with the stability margin of the system. An effective range of DC lines to improve the stability of the hybrid system is proposed. The analysis results are verified by MATLAB/Simulink simulation. Secondly, aiming at the special problems such as different adjustment of power angle locus and time-varying of electromagnetic power in multi-machine AC / DC system, this paper presents an analytical method to evaluate the stability margin of power angle of the whole system by using the relative motion of the equivalent power angle of complementary cluster. Based on the center transformation of inertia of complementary cluster, a homology cluster partition strategy is proposed, which takes the homology index of equivalent power angle as the performance index, and the feasibility of the method is verified by simulation. Then, in order to improve the transient stability of AC / DC system, DC power modulation technology is used to optimize the fault characteristics of the system in order to improve the transient stability of the system. Based on the analysis of DC power modulation to improve the transient stability of the system, an optimization strategy based on two kinds of power modulation is proposed. For large DC modulation, prony identification method is used to determine the input signal source, and an optimization strategy of variable step size hierarchical optimization parameters based on equivalent power angle homology index is proposed. For DC power boost / fallback modulation, the characteristics of modulation parameters are closely related to acceleration and deceleration area in the principle of equal area and multivariable nonlinearity is considered. Particle swarm optimization (PSO) algorithm based on unbalanced energy performance index is used to optimize the modulation strategy. Finally, the effectiveness of the two optimization strategies is verified by MATLAB and BPA transient simulation. The optimized modulation strategy can effectively improve the power angle stability of the system, and provide a certain reference for the DC power modulation strategy in practical engineering.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1;TM712

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 覃琴;郭強;周勤勇;秦曉輝;;國網(wǎng)“十三五”規(guī)劃電網(wǎng)面臨的安全穩(wěn)定問題及對策[J];中國電力;2015年01期

2 李兆偉;任先成;劉福鎖;李威;方勇杰;;交直流并聯(lián)電網(wǎng)中直流功率緊急控制影響及優(yōu)化研究[J];電力系統(tǒng)保護(hù)與控制;2014年20期

3 朱玲;王曉茹;盧岑岑;鄭偉杰;;基于BPA的大電網(wǎng)緊急直流功率支援策略研究[J];電力系統(tǒng)保護(hù)與控制;2013年23期

4 梁志峰;葛睿;董昱;陳剛;;印度“7.30”、“7.31”大停電事故分析及對我國電網(wǎng)調(diào)度運行工作的啟示[J];電網(wǎng)技術(shù);2013年07期

5 劉振亞;張啟平;;國家電網(wǎng)發(fā)展模式研究[J];中國電機(jī)工程學(xué)報;2013年07期

6 樊帆;張英敏;李興源;陳虎;王鵬飛;;基于主導(dǎo)慣量中心的緊急功率支援綜合策略研究[J];電力系統(tǒng)保護(hù)與控制;2012年20期

7 李晨;蔣德瓏;程生安;;電力系統(tǒng)暫態(tài)穩(wěn)定分析方法的現(xiàn)狀與發(fā)展[J];現(xiàn)代電子技術(shù);2012年16期

8 林俐;楊以涵;;基于擴(kuò)展等面積定則的含大規(guī)模風(fēng)電場電力系統(tǒng)暫態(tài)穩(wěn)定性分析[J];電力系統(tǒng)保護(hù)與控制;2012年12期

9 王洪濤;施鵬程;胡輝祥;;天廣直流附加穩(wěn)定控制策略研究[J];電力自動化設(shè)備;2011年08期

10 黃震;鄭超;龐曉艷;李e，

本文編號：2373299