本文選題：分布式電源 + 繼電保護(hù)��； 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：隨著分布式發(fā)電技術(shù)的快速發(fā)展以及分布式電源并網(wǎng)容量越來越大,其對電網(wǎng)帶來的影響變得不可忽略。本文深入研究分布式電源大量接入后對電網(wǎng)繼電保護(hù)的影響,其實(shí)質(zhì)在于分布式電源的接入改變了原網(wǎng)絡(luò)的結(jié)構(gòu),從而引起保護(hù)檢測電流的變化,最終影響繼電保護(hù)正確動作。 文章研究了分布式電源模型,主要針對典型分布式電源風(fēng)機(jī)特性分析,并建立風(fēng)機(jī)模型,討論正常運(yùn)行及故障情況下的電壓電流波形。研究分布式電源并網(wǎng)控制策略,建立基于PQ控制特性的等效分布式電源模型,并通過仿真驗(yàn)證所采用的功率外環(huán)、電流內(nèi)環(huán)的雙閉環(huán)控制策略可以很好地實(shí)現(xiàn)定有功與定無功控制,證明所建分布式電源模型的有效性。 從理論角度系統(tǒng)分析了分布式電源接入位置、容量對線路保護(hù)整定的影響,在理論分析的基礎(chǔ)之上,搭建了基于PSCAD/EMTDC暫態(tài)仿真軟件平臺的IEEE7節(jié)點(diǎn)系統(tǒng)來驗(yàn)證理論分析的正確性,并且計(jì)算了分布式電源接入點(diǎn)不同情況下的準(zhǔn)入容量,結(jié)果證實(shí)理論分析與仿真計(jì)算一致,驗(yàn)證了理論分析的正確性和可靠性。 在綜合分析多種情況下分布式電源對配電網(wǎng)的影響的基礎(chǔ)之上,本文提出了基于本地信息量的自適應(yīng)保護(hù)方案,通過在原始的線路電流保護(hù)基礎(chǔ)之上添加自適應(yīng)保護(hù),可以很大程度提高線路保護(hù)靈敏度,盡可能地適應(yīng)線路各種工作狀態(tài)的變化,通過仿真表明算法能夠很好應(yīng)對分布式電源接入前后的線路過流,驗(yàn)證了本文提出自適應(yīng)算法的有效性和正確性。 針對電流保護(hù)的不足,在分析分布式電源的接入對距離保護(hù)的影響后,提出自適應(yīng)距離保護(hù)方案,主要對距離Ⅱ段的保護(hù)整定進(jìn)行改進(jìn),并進(jìn)行距離保護(hù)的仿真,驗(yàn)證了該方案的正確性和可行性。
[Abstract]:With the rapid development of distributed generation technology and the increasing capacity of distributed generation, the influence of distributed generation on power grid can not be ignored. In this paper, the influence of distributed power supply on relay protection after a large amount of access is deeply studied. Its essence lies in the fact that the access of distributed power source changes the structure of the original network, which leads to the change of protection detection current and ultimately affects the correct operation of relay protection. This paper studies the distributed power generation model, mainly analyzes the characteristics of the typical distributed power fan, and establishes the fan model to discuss the voltage and current waveform under normal operation and fault. This paper studies the grid-connected control strategy of distributed power supply, establishes an equivalent distributed power supply model based on PQ control characteristics, and verifies the power outer loop by simulation. The double closed loop control strategy of the inner loop of current can realize the constant active power and fixed reactive power control very well, which proves the validity of the model of distributed power supply. This paper systematically analyzes the influence of the location and capacity of distributed power access on line protection setting from the theoretical point of view. On the basis of theoretical analysis, an IEEE 7 bus system based on PSCAD / EMTDC transient simulation software platform is built to verify the correctness of the theoretical analysis. The access capacity of the distributed power access point is calculated under different conditions. The results show that the theoretical analysis is consistent with the simulation calculation, and the correctness and reliability of the theoretical analysis are verified. On the basis of comprehensive analysis of the influence of distributed power generation on distribution network under various conditions, this paper proposes an adaptive protection scheme based on local information, which adds adaptive protection to the original line current protection. It can improve the sensitivity of line protection to a great extent and adapt to the variety of line working state as much as possible. The simulation results show that the algorithm can deal with the over-current of line before and after the access of distributed power supply. The validity and correctness of the proposed adaptive algorithm are verified. In view of the deficiency of current protection, after analyzing the influence of the access of distributed power supply on distance protection, an adaptive distance protection scheme is proposed, which mainly improves the protection setting of the distance 鈪，

本文編號：2080142