本文關(guān)鍵詞：大規(guī)模交直流系統(tǒng)電磁暫態(tài)仿真和穩(wěn)定控制技術(shù)研究　出處：《浙江大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大規(guī)模交直流系統(tǒng) 動(dòng)態(tài)等值 電磁暫態(tài)仿真 直流附加控制 緊急功率支援 暫態(tài)穩(wěn)定性 滑�？刂� H_2/H_x混合控制

【摘要】：我國(guó)能源資源與電力需求之間的逆向分布客觀上決定了我國(guó)要實(shí)施“西電東送、南北互供、全國(guó)聯(lián)網(wǎng)”電力發(fā)展戰(zhàn)略。區(qū)域電網(wǎng)互聯(lián)和高壓直流輸電(High Voltage Direct Current, HVDC)技術(shù)在電力系統(tǒng)中的廣泛應(yīng)用使我國(guó)電力系統(tǒng)朝著大規(guī)模、跨大區(qū)、交直流互聯(lián)方向發(fā)展。交直流互聯(lián)使得大規(guī)模交直流電力系統(tǒng)的動(dòng)態(tài)行為更加復(fù)雜,傳統(tǒng)機(jī)電暫態(tài)仿真技術(shù)已不能完全滿足要求；另外,在新特性下大規(guī)模交直流電力系統(tǒng)的安全穩(wěn)定運(yùn)行面臨更多的挑戰(zhàn),這對(duì)電網(wǎng)安全穩(wěn)定控制技術(shù)提出了更高的要求。為此,本文圍繞大規(guī)模交直流電力系統(tǒng)電磁暫態(tài)仿真和穩(wěn)定控制技術(shù)進(jìn)行了深入的研究,完成了以下工作： (1)提出了一種適用于大規(guī)模交直流電磁暫態(tài)仿真的動(dòng)態(tài)等值方法。該方法在等值的過(guò)程中保留500kV主干網(wǎng)架、重要的直流線路以及它們之間的交流聯(lián)系,并保證等值發(fā)電機(jī)對(duì)主干網(wǎng)架支撐的短路電流與原網(wǎng)絡(luò)相同；在等值過(guò)程中不需要解開500kV和220kV電壓等級(jí)之間的電磁環(huán)網(wǎng),等值后的系統(tǒng)可以用于在電磁暫態(tài)仿真平臺(tái)中詳細(xì)研究大規(guī)模交直流系統(tǒng)間的相互作用特性。以南方電網(wǎng)交直流系統(tǒng)為算例表明該動(dòng)態(tài)等值方法較好地保留了大規(guī)模交直流系統(tǒng)的動(dòng)態(tài)特性。 (2)研究了一種基于PSCAD/EMTDC的大規(guī)模交直流系統(tǒng)電磁暫態(tài)仿真建模方法。給出了機(jī)電暫態(tài)仿真程序PSS/E和電磁暫態(tài)程序PSCAD/EMTDC中元件模型的對(duì)應(yīng)關(guān)系以及PSCAD/EMTDC中元件的自定義方法。該方法已成功應(yīng)用于PSCAD/EMTDC中南方電網(wǎng)交直流系統(tǒng)的搭建,建模方法的有效性通過(guò)PSS/E和PSCAD/EMTDC的時(shí)域仿真對(duì)比得到了驗(yàn)證。最后通過(guò)分析交流不對(duì)稱故障對(duì)直流系統(tǒng)運(yùn)行乃至整個(gè)交流系統(tǒng)的影響,闡明了在研究大規(guī)模交直流系統(tǒng)時(shí)機(jī)電暫態(tài)仿真程序的局限性和采用電磁暫態(tài)仿真程序的必要性。 (3)提出了一種提高交直流電力系統(tǒng)暫態(tài)穩(wěn)定性的HVDC廣域魯棒控制器設(shè)計(jì)方法。該方法考慮直流系統(tǒng)簡(jiǎn)化模型引起的誤差、信號(hào)時(shí)滯及各種干擾給附加控制器的設(shè)計(jì)增加的不確定因素,首先根據(jù)區(qū)域慣量中心(Center of Interia, COⅠ)的運(yùn)動(dòng)方程和滑�？刂圃O(shè)計(jì)方法確定滑模切換面,然后利用李雅普諾夫穩(wěn)定性定理保證系統(tǒng)在不確定因素存在的情況下漸近穩(wěn)定,最后為了將HVDC廣域魯棒控制設(shè)計(jì)方法推廣到大規(guī)模交直流電力系統(tǒng)中,提出了直流系統(tǒng)一機(jī)組控制敏感指標(biāo)。以4機(jī)2區(qū)域交直流系統(tǒng)、多饋入交直流系統(tǒng)和浙江電網(wǎng)為算例表明了HVDC廣域魯棒控制器的有效性。 (4)提出了一種基于多工況綜合留數(shù)及H2/H,混合控制的直流附加阻尼控制的魯棒設(shè)計(jì)方法。該方法綜合考慮了控制器安裝地點(diǎn)和反饋信號(hào)組合方案對(duì)主導(dǎo)模式的可觀可控性、對(duì)其它模式的耦合作用和對(duì)多種運(yùn)行工況的魯棒性三個(gè)因素,提出了多工況綜合留數(shù)指標(biāo)來(lái)確定最優(yōu)方案,并通過(guò)比較所設(shè)計(jì)的控制器的H2/H∞綜合性能驗(yàn)證了多工況綜合留數(shù)指標(biāo)的有效性。最后,在一個(gè)大規(guī)模交直流混聯(lián)系統(tǒng)多種運(yùn)行工況多種故障下驗(yàn)證了基于多工況綜合留數(shù)和H2/H∞的直流附加阻尼控制魯棒設(shè)計(jì)方法的有效性。 (5)分析了大規(guī)模交直流系統(tǒng)中直流系統(tǒng)實(shí)際輸送功率受直流系統(tǒng)換流站交流母線電壓波動(dòng)的影響情況。首先根據(jù)直流系統(tǒng)Ud-Id特性曲線分析得到兩端換流站交流母線電壓變化時(shí)直流系統(tǒng)的各種可能的運(yùn)行模式,再針對(duì)每種運(yùn)行模式計(jì)算得到此時(shí)直流系統(tǒng)的實(shí)際輸送功率。研究結(jié)果表明,只有兩端換流站交流母線電壓維持在一定電壓水平,才能使直流系統(tǒng)實(shí)際輸送功率達(dá)到緊急功率支援指令值。
[Abstract]:Reverse distribution between energy resources and power demand of China decided our country should implement the "west to East, North South mutual supply, a national network of electric power development strategy. The regional power grid interconnection and HVDC (High Voltage Direct Current HVDC) technology is widely used in electric power system, the power system of our country in a large, cross regional, AC / DC direction. The dynamic behavior of AC-DC interconnected large-scale AC / DC power system is more complex, the traditional electromechanical transient simulation technology can not satisfy the requirements; in addition, the safe and stable operation of large-scale AC / DC power system in the new characteristics of the face more challenges, the security and stability of power grid control technology has put forward higher requirements. Therefore, this paper focuses on large-scale AC / DC power system electromagnetic transient simulation and stability control technology is studied, end The following work has been made:
(1) dynamic equivalence method is proposed for large-scale AC / DC electromagnetic transient simulation. The method retains the 500kV skeleton in the equivalent process between the DC line and their important communication links, and ensure that the short circuit current equivalent generator on the trunk network support is the same as the original network; the equivalent process do not need to unlock the electromagnetic loop network between 500kV and 220kV voltage level, the equivalent system can be used in the electromagnetic transient simulation platform in detail based on large-scale interaction characteristics of DC system. In AC DC system for example shows that the dynamic equivalence method effectively keeps the dynamic characteristics of the large scale AC / DC systems.
(2) of a PSCAD/EMTDC electromagnetic transient simulation modeling method of large-scale AC / DC system. Based on the given correspondence between the elements of electromechanical transient simulation program PSS/E and electromagnetic transient program PSCAD/EMTDC model and method of the custom PSCAD/EMTDC components. This method has been successfully applied to build AC / DC system in PSCAD/EMTDC, effectiveness the modeling method obtained by time domain simulation comparison between the PSS/E and PSCAD/EMTDC verification. Finally through the analysis of AC asymmetric fault impact on the operation of HVDC system and the communication system, expounded the large-scale AC / DC system in electromechanical transient simulation program and the limitation of the electromagnetic transient simulation program is necessary.
(3) presents a method to improve the design method of robust controller of HVDC wide area transient stability of AC / DC power system. This method takes into account the error caused by the simplified model of DC system, signal delay and uncertainty interference to design additional controller increase, according to the regional center of inertia (Center of Interia, CO 1) to determine the sliding mode the switching surface and motion equation of sliding mode control design method, then using Lyapunov stability theorem guarantees the system asymptotically stable in the uncertain factors exist, finally to the HVDC wide area robust control design method is extended to large-scale AC / DC power system, DC system control unit is put forward on the 4 machine 2 sensitive indicators. Regional AC / DC system, multi infeed HVDC system and Zhejiang power grid show the effectiveness of the wide area robust controller with HVDC as an example.
(4) proposed a multi condition comprehensive residue and H2/H based on the robust design method of HVDC damping control of hybrid control. This method considers the controller mounting locations and feedback signals of the dominant mode of combination of observability and controllability, coupling to other models with multiple operating conditions and the robustness of the three a factor, put forward a comprehensive multi residue index condition to determine the optimal scheme, and the effectiveness of comprehensive multi residue index condition is verified by comparing the H2/H controller design of the comprehensive performance. Finally, in a large scale AC-DC hybrid system under various operating conditions of a variety of fault to verify the effectiveness of HVDC damping for the H2/H residue and the comprehensive condition of robust control design method based on.
(5) analysis of the impact of large-scale AC / DC system and DC system in the actual transmission power by the voltage fluctuation of DC system converter AC bus. Firstly, according to the characteristics of Ud-Id curve analysis of DC system running mode converter AC bus voltage change at both ends of the DC system may, for each kind of operating mode to calculate the actual transmission power at DC the system is obtained. The results of the study show that only two converter bus voltage is maintained at a certain voltage level, in order to make the actual transmission power of the HVDC system to achieve emergency power support command value.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM721.1

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本文編號(hào)：1401801