【摘要】：隨著高電壓、大容量電力電子技術(shù)的發(fā)展,高壓直流輸電在長(zhǎng)距離輸電、異步電網(wǎng)互聯(lián)、可再生能源發(fā)電并網(wǎng)等方面得到廣泛應(yīng)用。由于直流逆變站落點(diǎn)密集,負(fù)荷中心電網(wǎng)形成多直流饋入的網(wǎng)架結(jié)構(gòu)。以半控型晶閘管為換流器件的高壓直流輸電系統(tǒng)的運(yùn)行需要受端交流電網(wǎng)的強(qiáng)力支撐,若受端電網(wǎng)較弱,將引發(fā)安全穩(wěn)定問(wèn)題。在多直流饋入受端電網(wǎng)中,由于各直流饋入子系統(tǒng)之間相互影響,電網(wǎng)某處故障可能引起多回直流逆變站同時(shí)換相失敗,嚴(yán)重時(shí)將導(dǎo)致一饋或多饋直流閉鎖,使受端電網(wǎng)失去大電源,.引起系統(tǒng)失穩(wěn),造成巨大的停電損失。研究多直流饋入系統(tǒng)特性及控制策略,對(duì)保持電網(wǎng)穩(wěn)定運(yùn)行具有重要的理論意義與應(yīng)用價(jià)值。本文圍繞多直流饋入受端電網(wǎng)的電壓特性及控制策略開(kāi)展研究,主要工作與研究成果如下:(1)多直流饋入受端電網(wǎng)靜態(tài)電壓穩(wěn)定性評(píng)估。分析影響多直流饋入受端電網(wǎng)靜態(tài)電壓穩(wěn)定性的主要因素,即受端交流系統(tǒng)強(qiáng)度、各直流之間電壓耦合程度,提取量化指標(biāo)并進(jìn)行信息壓縮。采用多元回歸分析方法,建立以靜態(tài)電壓穩(wěn)定性指標(biāo)為因變量,受端交流系統(tǒng)強(qiáng)度指標(biāo)、多直流之間電壓耦合程度指標(biāo)為自變量的回歸分析模型。對(duì)算例系統(tǒng)進(jìn)行了仿真,驗(yàn)證了所提評(píng)估方法的有效性。(2)多直流饋入系統(tǒng)協(xié)同二級(jí)電壓控制。建立多直流饋入系統(tǒng)二級(jí)電壓控制模型,該模型能夠應(yīng)用于由電網(wǎng)換相型高壓直流輸電(LCC-HVDC)和電壓源型高壓直流輸電(VSC-HVDC)構(gòu)成的混合多直流饋入系統(tǒng)。提出基于一致性算法的多直流饋入系統(tǒng)協(xié)同二級(jí)電壓控制策略,采用Lagrange乘子法推導(dǎo)一致項(xiàng)與修正項(xiàng)。基于H2性能標(biāo)準(zhǔn),建立協(xié)同二級(jí)電壓控制策略的通信網(wǎng)絡(luò)優(yōu)化模型,并采用混合整數(shù)規(guī)劃法進(jìn)行求解。對(duì)算例系統(tǒng)進(jìn)行了仿真,驗(yàn)證了所提控制策略的有效性。(3)多直流饋入系統(tǒng)換相失敗免疫能力分析與提高。提出基于電磁暫態(tài)仿真的直流換相失敗免疫能力指標(biāo)的計(jì)算方法�？紤]受端電網(wǎng)的無(wú)功、電壓分布特性,推導(dǎo)能夠適應(yīng)系統(tǒng)運(yùn)行方式變化的電壓關(guān)聯(lián)因子的解析表達(dá)式,應(yīng)用電壓關(guān)聯(lián)因子及臨界電壓關(guān)聯(lián)因子,提出識(shí)別多直流饋入系統(tǒng)發(fā)生同時(shí)換相失敗區(qū)域的方法。采用電磁暫態(tài)仿真,分析多種動(dòng)態(tài)無(wú)功補(bǔ)償裝置對(duì)提高直流換相失敗免疫能力的作用,在此基礎(chǔ)上,提出動(dòng)態(tài)無(wú)功補(bǔ)償裝置的配置方案,以提高多直流饋入系統(tǒng)換相失敗免疫能力,消除同時(shí)換相失敗區(qū)域。對(duì)算例系統(tǒng)進(jìn)行了仿真,驗(yàn)證了所提分析方法及配置方案的有效性。
[Abstract]:With the development of high-voltage and large-capacity power electronics technology, HVDC transmission has been widely used in long-distance transmission, asynchronous grid interconnection, renewable energy generation grid connection and so on. Due to the dense drop point of DC inverter station, a multi-DC feed-in grid structure is formed in the load center network. The operation of HVDC system with semi-controlled thyristor as commutator needs strong support from AC network. If the terminal grid is weak, it will lead to security and stability problems. In the multi-DC feed-into-the-receiving power grid, due to the interaction among the DC-fed subsystems, some faults in the power network may cause the simultaneous commutation failure of the multi-circuit DC inverter station, which will lead to one-feed or multi-feed DC lock-up in serious cases. Loss of large power supply to the receiving end of the grid. Causes the system instability, causes the huge blackout loss. The research on the characteristics and control strategy of multi-DC feed-in system is of great theoretical significance and application value for maintaining the stable operation of the power network. In this paper, the voltage characteristics and control strategies of multi-DC feed into the receiving power grid are studied. The main work and achievements are as follows: (1) the static voltage stability evaluation of the multi-DC feed into the receiving power grid. This paper analyzes the main factors affecting the stability of the static voltage of the multi-DC-fed power grid, that is, the strength of the AC system at the receiving end, the voltage coupling degree between the DC and the receiver, and the quantitative index is extracted and the information compression is carried out. By using multiple regression analysis method, a regression analysis model is established, which takes static voltage stability index as dependent variable, receiving terminal AC system strength index and voltage coupling degree index between multiple DC currents as independent variables. The simulation results show the effectiveness of the proposed method. (2) Multi-DC feed systems cooperate with two-stage voltage control. A two-stage voltage control model for multi-feed-in system is established, which can be applied to hybrid multi-DC feed-in system composed of commutated HVDC transmission (LCC-HVDC) and voltage source HVDC (VSC-HVDC). A coordinated two-stage voltage control strategy based on consistency algorithm for multi-DC feed-in system is proposed. The uniform and modified terms are derived by using the Lagrange multiplier method. Based on H _ 2 performance standard, the communication network optimization model of cooperative two-stage voltage control strategy is established, and the mixed integer programming method is used to solve the problem. The simulation results show the effectiveness of the proposed control strategy. (3) the immune capability of commutation failure of multi-DC feed system is analyzed and improved. The calculation method of DC commutation failure immunity index based on electromagnetic transient simulation is presented. Considering the reactive power and voltage distribution characteristics of the receiving power grid, the analytical expression of the voltage correlation factor which can adapt to the change of the operation mode of the system is derived, and the voltage correlation factor and the critical voltage correlation factor are applied. A method is proposed to identify the simultaneous commutation failure area of a multi-DC feed-in system. The electromagnetic transient simulation is used to analyze the effect of various dynamic reactive power compensation devices on improving the immunity of DC commutation failure. On this basis, the configuration scheme of the dynamic reactive power compensation device is put forward. In order to improve the ability of commutation failure immunity of multi-DC feed-in system, the area of simultaneous commutation failure is eliminated. An example system is simulated to verify the effectiveness of the proposed analysis method and configuration scheme.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李勇;;強(qiáng)直弱交區(qū)域互聯(lián)大電網(wǎng)運(yùn)行控制技術(shù)與分析[J];電網(wǎng)技術(shù);2016年12期

2 趙書(shū)強(qiáng);董沛毅;蒲瑩;盧亞軍;馬玉龍;高本鋒;毛亞鵬;;逆變側(cè)控制策略對(duì)換相失敗影響的研究[J];電網(wǎng)技術(shù);2016年12期

3 趙文猛;劉明波;;多區(qū)域電力系統(tǒng)分散式動(dòng)態(tài)經(jīng)濟(jì)調(diào)度的割平面一致性算法[J];中國(guó)電機(jī)工程學(xué)報(bào);2016年21期

4 張紅麗;劉福鎖;李威;;動(dòng)態(tài)無(wú)功補(bǔ)償裝置提高多饋入直流恢復(fù)的布點(diǎn)方法[J];電力系統(tǒng)自動(dòng)化;2016年05期

5 肖浩;李銀紅;于芮技;段獻(xiàn)忠;;影響多饋入直流系統(tǒng)換相失敗的電網(wǎng)薄弱區(qū)域快速識(shí)別方法[J];中國(guó)電機(jī)工程學(xué)報(bào);2016年07期

6 辛煥海;章楓;于洋;甘德強(qiáng);徐謙;;多饋入直流系統(tǒng)廣義短路比:定義與理論分析[J];中國(guó)電機(jī)工程學(xué)報(bào);2016年03期

7 王峰;劉天琪;周勝軍;李興源;喬光堯;;諧波對(duì)HVDC系統(tǒng)換相失敗的影響機(jī)理及定量分析方法[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年19期

8 謝惠藩;楊光源;彭光強(qiáng);陳曉鵬;;廣州換流站交流濾波器投切對(duì)天廣直流換相失敗的影響[J];南方電網(wǎng)技術(shù);2015年09期

9 肖浩;朱佳;李銀紅;李明;;多饋入直流系統(tǒng)換相失敗免疫水平快速確定方法研究[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年11期

10 王旭冉;郭慶來(lái);孫宏斌;王彬;張明曄;張伯明;;考慮快速動(dòng)態(tài)無(wú)功補(bǔ)償?shù)亩?jí)電壓控制[J];電力系統(tǒng)自動(dòng)化;2015年02期

相關(guān)博士學(xué)位論文 前3條

1 周勤勇;多直流饋入受端電網(wǎng)直流受電規(guī)模研究[D];山東大學(xué);2015年

2 陳修宇;多饋入直流系統(tǒng)電壓相互作用及其影響[D];華北電力大學(xué);2012年

3 ，

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