本文關(guān)鍵詞： 電動(dòng)汽車(chē)換電站 中壓配電網(wǎng) 饋線(xiàn)自動(dòng)化 故障電流 保護(hù)　出處：《華北電力大學(xué)(北京)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著電動(dòng)汽車(chē)行業(yè)的興起,各地涌現(xiàn)出一些大型的電動(dòng)汽車(chē)換電站示范工程。換電站一般由單元級(jí)的充放電機(jī)并聯(lián)組成,而這些充放電機(jī)主要由IGBT型電力電子器件和動(dòng)力電池構(gòu)成,通過(guò)PWM技術(shù)可以使得換電站工作于充電和放電兩種狀態(tài)。充電時(shí)換電站只是相當(dāng)于一般的負(fù)荷,對(duì)配電網(wǎng)故障時(shí)故障電流影響不大,但是當(dāng)換電站向電網(wǎng)放電時(shí),會(huì)使傳統(tǒng)的單電源配電網(wǎng)轉(zhuǎn)變?yōu)槎嚯娫磁潆娋W(wǎng),因而當(dāng)配電網(wǎng)發(fā)生故障時(shí),會(huì)對(duì)保護(hù)配合產(chǎn)生影響,甚至誤動(dòng)。研究了換電站的建模方法。構(gòu)建了充放電機(jī)的電路拓?fù)浣Y(jié)構(gòu),介紹了充放電機(jī)AC/DC環(huán)節(jié)、DC/DC環(huán)節(jié)、動(dòng)力電池的數(shù)學(xué)模型,在充電和放電狀態(tài)下對(duì)充放電機(jī)控制策略進(jìn)行了研究。研究了換電站接入中壓配電網(wǎng)后產(chǎn)生的影響,重點(diǎn)研究了FTU和重合器一熔斷器兩種饋線(xiàn)自動(dòng)化設(shè)備。分析了換電站接入后系統(tǒng)電流的變化,分別對(duì)換電站在近故障點(diǎn)接入、低接地電阻和遠(yuǎn)故障點(diǎn)接入、高接地電阻進(jìn)行了故障電流的分析,并對(duì)換電站向系統(tǒng)注入無(wú)功功率情況下進(jìn)行了理論分析,發(fā)現(xiàn)近故障點(diǎn)接入、低接地電阻、有無(wú)功功率注入時(shí)對(duì)配電網(wǎng)產(chǎn)生的影響更大,更容易使重合器一熔斷器型配合誤動(dòng)作。提出一種配電網(wǎng)故障時(shí)換電站輸出電流控制策略,根據(jù)換電站并網(wǎng)點(diǎn)電壓跌落的嚴(yán)重程度減小逆變器的電流,以解決保護(hù)誤配合問(wèn)題和穿越小干擾,從而不必將換電站完全從系統(tǒng)切除。在PSCAD/EMTDC下以典型的中壓輻射型配電網(wǎng)為例,對(duì)換電站接入進(jìn)行了模型仿真,仿真結(jié)果表明了本文提出的換電站輸出電流控制策略的有效性。
[Abstract]:With the rise of the electric vehicle industry, a number of large-scale electric vehicle power station demonstration projects have emerged. The power station is generally composed of unit level charging and discharging machines in parallel. These charge-discharge machines are mainly composed of IGBT power electronic devices and power batteries. Through PWM technology, the switching power station can work in two states of charging and discharging. When charging, the switching power station is only equivalent to the normal load, which has little effect on the fault current of distribution network. However, when the power station changes to the grid discharge, the traditional single-source distribution network will be transformed into multi-source distribution network, so when the distribution network failure, it will have an impact on the protection coordination. Even misoperation. The modeling method of power station is studied. The circuit topology structure of charging and discharging machine is constructed, and the mathematical model of DC / DC link and power battery of AC/DC link of charging and discharging machine is introduced. The control strategy of charging and discharging machine is studied in the state of charging and discharging, and the influence of switching power station on medium voltage distribution network is studied. In this paper, two kinds of feeder automation equipment, FTU and reclosure / fuse, are studied, and the change of system current after the switch power station is connected is analyzed. The switch power station is connected at the near fault point, the low grounding resistance and the remote fault point respectively. The fault current of the high grounding resistance is analyzed, and the theoretical analysis is carried out under the condition of injecting reactive power into the system. It is found that the near fault point is connected, and the low grounding resistance is found. The influence of reactive power injection on distribution network is greater and it is easier to make receptacle-fuse type mismatch. A control strategy of switching power station output current in distribution network fault is proposed. The current of the inverter is reduced according to the severity of the voltage drop of the switching power station in order to solve the protection mismatch problem and traverse small interference. Therefore, it is not necessary to remove the switching power station completely from the system. Taking the typical medium-voltage radiation distribution network as an example under PSCAD/EMTDC, the model simulation of the switching power station access is carried out. The simulation results show the effectiveness of the proposed output current control strategy.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM73;U491.8

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 高研;畢銳;楊為;丁銀;;分布式發(fā)電對(duì)配電網(wǎng)繼電保護(hù)的影響[J];電網(wǎng)與清潔能源;2009年04期

，

本文編號(hào)：1493321