發(fā)布時間：2018-06-22 12:09

  本文選題：配電網 + 分布式電源�。� 參考：《太原理工大學》2014年碩士論文

【摘要】：隨著全球能源問題的逐漸凸顯,使用清潔、低耗、可再生能源成為全世界共同的追求。分布式電源,如光伏、風機、蓄電池等近年來得到廣泛重視,其可直接接入配電網中給用戶供電。但與此同時分布式電源的接入改變了配電網的結構,配電網原來的故障定位方法不再適用。因此,研究新的適合于含分布式電源(Distributed Generation, DG)的配電網故障定位方法對于提高用戶供電可靠性和廣泛使用DG具有深遠意義。另外,為了充分發(fā)揮DG的優(yōu)勢及減小其對配網造成的不利影響,有學者提出了微電網的概念,目前大多數研究集中于微電網的運行與控制,對微電網的系統(tǒng)接地方式及安全性少有研究。 本文研究內容如下。 (1)DG的接入改變了配電網的節(jié)點類型,使得原有配電網的故障定位方法不再適用。本文分析了DG接入配電網后對原有故障定位算法的影響,分析了含DG的配電網節(jié)點類型,提出了故障定位實用化判據,并通過具體的含DG的配電網進行了仿真,驗證了該判據實用有效。 (2)介紹了目前配電網故障定位通用矩陣算法的原理,提出了基于改進矩陣算法的含DG配電網故障定位法。該方法將饋線終端單元(Feeder Terminal Unit, FTU)測得的故障信息和配網SCADA系統(tǒng)信息相結合并通過故障定位算法隔離故障區(qū)域,恢復非故障區(qū)域的正常供電。該方法無需進行矩陣相乘,定位原理簡單、直觀,對多分支母線節(jié)點測量環(huán)節(jié)工作異常無法判斷故障方向有一定的適應性。 (3)針對實際配電網饋線上一般不裝設電壓互感器TV的情況,提出了基于分布決策的含DG的配電網故障定位法。此方法利用智能電子裝置(Intelligent Electronic Device, IED)交換信息和關聯區(qū)域狀態(tài)函數F(A)及區(qū)段狀態(tài)函數G(i,j)定位故障。本文還介紹了F(A)和G(i,j)的計算方法、IED關聯區(qū)域靜態(tài)劃分、動態(tài)修整法。此方法具有無需借助于電壓量測量的優(yōu)點,能夠很好地用于含DG配電網的故障定位。 (4)利用配電網廣域范圍的電流量信息,提出了不需要借助方向信息的含DG配電網故障定位方法,即利用電流Ⅱ段保護的動作信息對發(fā)生在DG上游區(qū)域的故障進行定位,利用電流Ⅲ段保護的動作信息對發(fā)生在DG下游區(qū)域的故障進行定位,快速切除故障。本方案在故障定位時無需借助于電壓量測量,且不需改變配網原有電流Ⅱ段及Ⅲ段保護整定值,減小了整定工作量。 (5)研究了微電網的系統(tǒng)接地方式。微電網孤島運行時,微電源受到電力電子開關裝置的限制,無法提供很大的故障電流。本文提出采用蓄電池儲能裝置來提供更大的故障電流,設計了微電網中變壓器的接地網。經仿真分析,在故障條件下,變壓器內外部實際接觸電壓和跨步電壓都未超過二者的安全閾值,證明了所設計接地網滿足安全性要求。
[Abstract]:With the global energy problem gradually prominent, the use of clean, low consumption, renewable energy has become the common pursuit of the world. Distributed power generation, such as photovoltaic, fan, battery and so on, has been paid more and more attention in recent years, and it can be directly connected to the distribution network to supply power to users. But at the same time, the access of distributed generation has changed the structure of distribution network, the original fault location method of distribution network is no longer applicable. Therefore, it is of great significance to study a new fault location method with distributed generation (DG) for improving the reliability of power supply and widely using DG. In addition, in order to give full play to the advantages of DG and reduce its adverse influence on distribution network, some scholars have put forward the concept of microgrid. At present, most of the research focuses on the operation and control of microgrid. There is little research on the grounding mode and safety of microgrid system. The main contents of this paper are as follows: (1) the access of DG changes the type of nodes in the distribution network and makes the fault location method of the original distribution network no longer applicable. This paper analyzes the influence of DG on the original fault location algorithm, analyzes the type of distribution network node with DG, puts forward the practical criterion of fault location, and simulates the distribution network with DG. It is proved that the criterion is practical and effective. (2) the principle of current universal matrix algorithm for distribution network fault location is introduced, and a fault location method with DG based on improved matrix algorithm is proposed. This method combines the fault information measured by Feeder Terminal Unit (FTU) and SCADA system information of distribution network. The fault area is isolated by fault location algorithm, and the normal power supply in non-fault area is restored. The method does not need matrix multiplication, and the positioning principle is simple and intuitionistic. It has some adaptability to the abnormal work of multi-branch busbar node. (3) aiming at the situation that voltage transformer TV is not generally installed on the feeder line of actual distribution network, A DG based fault location method for distribution network based on distributed decision is proposed. This method uses Intelligent Electronic device (IED) to exchange information and correlate region state function F (A) and segment state function G (ij) to locate faults. This paper also introduces the calculation methods of F (A) and G (ij). This method has the advantages of no need of voltage measurement, and can be used in fault location of distribution network with DG well. (4) the wide area current information of distribution network is used. In this paper, a fault location method containing DG distribution network without direction information is proposed, that is, fault location occurs in the upstream region of DG using the action information of current section 鈪，

本文編號：2052785