發(fā)布時間：2018-11-05 06:54

【摘要】：我國能源和生產(chǎn)力的逆向分布,決定了需要采取大規(guī)模長距離的輸電模式。直流輸電以其在大容量、長距離輸電上的優(yōu)勢近年來尤其在我國得到了快速的發(fā)展。隨著直流輸電的廣泛應(yīng)用,交直流系統(tǒng)間的復(fù)雜相互作用使得電力系統(tǒng)的安全性問題較為突出。我國華東地區(qū)已經(jīng)形成了有多條直流饋入的多饋入直流系統(tǒng),這需要受端交流電網(wǎng)的堅強(qiáng)支撐。根據(jù)電壓和無功的關(guān)系,提高多饋入直流系統(tǒng)安全性的最好方法就是進(jìn)行動態(tài)無功補(bǔ)償裝置配置,但如何有效高效的進(jìn)行動態(tài)無功配置,此方面的研究目前尚不完善。 本文介紹了我國華東地區(qū)復(fù)雜多饋入直流系統(tǒng)所面臨的問題,從無功對電壓支撐的出發(fā),確定了以系統(tǒng)電壓薄弱區(qū)域作為動態(tài)無功補(bǔ)償區(qū)域,結(jié)合已有的交流系統(tǒng)薄弱區(qū)域的選擇方法,借鑒主導(dǎo)節(jié)點(diǎn)的概念,針對多饋入直流系統(tǒng)的特點(diǎn),提出了尋找多饋入直流無功補(bǔ)償主導(dǎo)節(jié)點(diǎn)作為動態(tài)無功配置點(diǎn)的方法。該方法重點(diǎn)考慮了交流系統(tǒng)對于直流系統(tǒng)的支撐效果,并用多饋入短路比設(shè)計權(quán)重因子衡量不同直流的重要性,同時也考慮了無功補(bǔ)償對于其他交流節(jié)點(diǎn)的作用。然后在選點(diǎn)的基礎(chǔ)上,進(jìn)行了使用粒子群算法的動態(tài)無功補(bǔ)償裝置的容量優(yōu)化。不同于傳統(tǒng)的靜態(tài)無功優(yōu)化,本文方法基于動態(tài)仿真,用短路容量作為反映交流系統(tǒng)對直流系統(tǒng)支撐能力的指標(biāo),并以補(bǔ)償容量作為罰函數(shù),考慮了動態(tài)無功配置的性價比,使優(yōu)化結(jié)果有效且高效。最后,通過算例分析驗證了本文動態(tài)無功配置優(yōu)化方法的有效,并用本文方法對蘇南地區(qū)電網(wǎng)的動態(tài)無功優(yōu)化配置進(jìn)行了仿真分析,表明本文所提方法對于復(fù)雜電網(wǎng)系統(tǒng)的有效性和對實際規(guī)劃的意義。
[Abstract]:The reverse distribution of energy and productivity determines the need for large-scale long-distance transmission. Direct current transmission (HVDC) has been developing rapidly in recent years, especially in China, because of its advantages in large capacity and long distance transmission. With the wide application of DC transmission, the complex interaction between AC and DC system makes the security problem of power system more prominent. A multi-fed DC system with multiple DC feeders has been formed in East China, which needs strong support from the end AC power grid. According to the relationship between voltage and reactive power, the best way to improve the security of multi-fed DC system is to configure the dynamic reactive power compensator, but how to effectively and efficiently configure the dynamic reactive power is not perfect. This paper introduces the problems faced by complex multi-input DC system in East China. From the point of reactive power to voltage support, the weak voltage region of the system is determined as the dynamic reactive power compensation area. Based on the existing methods of selecting weak area of AC system and referring to the concept of leading node, a method to find the dominant node of multi-fed DC reactive compensation as a dynamic reactive power assignment point is put forward according to the characteristics of multi-infeed DC system. In this method, the support effect of AC system for DC system is considered, the importance of different DC is measured by the weight factor of multi-feed short circuit ratio design, and the effect of reactive power compensation on other AC nodes is also considered. Then on the basis of selecting points, the capacity of dynamic reactive power compensator using particle swarm optimization algorithm is optimized. Different from the traditional static reactive power optimization, based on dynamic simulation, the short-circuit capacity is used as the index to reflect the support ability of AC system to DC system, and the compensation capacity is taken as penalty function, and the performance-price ratio of dynamic reactive power allocation is considered. The optimization results are effective and efficient. Finally, the effectiveness of the dynamic reactive power allocation optimization method is verified by a numerical example, and the simulation analysis of the dynamic reactive power optimal configuration in the southern Jiangsu power network is carried out by using the method in this paper. The results show that the method proposed in this paper is effective for complex grid systems and has great significance for practical planning.
【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】：2014
【分類號】：TM714.3

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