本文選題：雙邊供電 + 均衡電流　； 參考：《西南交通大學》2017年碩士論文

【摘要】：電氣化鐵路為單相負荷,對電力系統(tǒng)而言為不對稱負荷,為減輕對電力系統(tǒng)的負序影響,無論是普速鐵路還是高速鐵路,牽引供電系統(tǒng)都采用了分段換相取流的方法,這就導致了牽引變電所出口處和分區(qū)所處電分相環(huán)節(jié)的出現(xiàn)。電分相由于其機械以及電氣上的弱點不利于高速和重載運輸。于牽引變電所處裝設同相供電裝置可有效治理負序諧波等電能質量問題以及取消變電所出口處電分相。采取雙邊供電方式可取消分區(qū)所處電分相環(huán)節(jié)且進一步提升牽引供電系統(tǒng)供電能力及供電可靠性且可配合同相供電技術實現(xiàn)全線貫通供電。但采用雙邊供電后牽引網(wǎng)將構成電力系統(tǒng)的一個連枝,類似于電力系統(tǒng)的高低壓電磁環(huán)網(wǎng),然而二者也有顯著的不同,電氣化鐵路雙邊供電僅是某一相被連通而不是三相連通。相關研究表明高低壓電磁環(huán)網(wǎng)會對電力系統(tǒng)的安全穩(wěn)定運行產生不利影響,因此應結合電力系統(tǒng)與鐵路實際進一步研究雙邊供電對電力系統(tǒng)的影響。首先本文分析影響電力系統(tǒng)側影響均衡電流的因素,得出均衡電流主要由電力系統(tǒng)等值阻抗與牽引供電系統(tǒng)等值阻抗之比所決定,減小這一比值是控制均衡電流的關鍵。同時推導了貫通輸電線供電方式下穩(wěn)態(tài)均衡電流的表達式并就雙邊供電是否會對電力系統(tǒng)繼電保護構成影響以及系統(tǒng)側斷線引發(fā)的潮流轉移進行了理論及仿真分析,提出了一種基于分段供電與狀態(tài)測控技術的雙邊供電保護方案。其次分析了分區(qū)所開關閉合時的暫態(tài)過程,建立沖擊電流和電壓幅值差、相角差的對應關系,通過PSCAD仿真驗證了理論計算的正確性,提出根據(jù)所允許的穩(wěn)態(tài)電流、沖擊電流最大值求解允許雙邊供電的開關兩側電壓幅值差和相角差的限額的方法。從諧波影響方面對雙邊供電系統(tǒng)諧振機理進行理論分析就諧波向高壓三相系統(tǒng)及低壓三相系統(tǒng)的滲透特性進行理論推導,提出了基于阻波高通濾波器的諧振及諧波滲透問題解決方案。最后利用PSD電力系統(tǒng)分析軟件對雙邊供電運用于楚雄電網(wǎng)的可行性進行了分析,驗證了外部供電方式會對雙邊供電均衡電流有所影響,正常運行條件下雙邊供電方式并不會對電力系統(tǒng)穩(wěn)定性造成影響。
[Abstract]:The electrified railway is a single-phase load and an asymmetrical load to the power system. In order to reduce the negative sequence effect on the power system, the traction power supply system adopts the method of piecewise commutation to take the current, whether on the ordinary speed railway or the high-speed railway.This leads to the emergence of the phase separation link at the outlet of the traction substation and the sub-area.Electrical separation due to its mechanical and electrical weaknesses are not conducive to high-speed and heavy-haul transport.The power quality problems such as negative sequence harmonics can be effectively solved and the phase separation at the outlet of the substation can be eliminated by installing the in-phase power supply device in the traction substation.The two-sided power supply method can cancel the phase separation link and further improve the power supply capacity and reliability of the traction power supply system, and can cooperate with the in-phase power supply technology to realize the power supply through the whole line.However, the traction network with bilateral power supply will form a connecting branch of power system, similar to the high and low voltage electromagnetic loop network of power system. However, there is a significant difference between them. The bilateral power supply of electrified railway is only connected in one phase rather than in three phases.Related studies show that the high and low voltage electromagnetic loop network will have adverse effects on the safe and stable operation of the power system. Therefore, the influence of bilateral power supply on the power system should be further studied in combination with the actual situation of the power system and the railway.Firstly, this paper analyzes the factors that influence the equalization current of power system side, and concludes that the equalization current is mainly determined by the ratio of the equivalent impedance of power system to the equivalent impedance of traction power supply system, and reducing this ratio is the key to control the equalization current.At the same time, the expression of steady-state equalization current under the power supply mode of transmissible transmission line is derived, and the theoretical and simulation analysis on whether the two-sided power supply will affect the power system relay protection and the power flow transfer caused by the system side breakage is carried out.A two-sided power supply protection scheme based on subsection power supply and state measurement and control technology is proposed.Secondly, the transient process when the switch is closed is analyzed, and the corresponding relation between impulse current and voltage amplitude difference and phase angle difference is established. The correctness of the theoretical calculation is verified by PSCAD simulation.The method of calculating the limit of voltage amplitude difference and phase angle difference between the two sides of the switch with the maximum impulse current.From the aspect of harmonic influence, the resonant mechanism of two-sided power supply system is theoretically analyzed. The permeation characteristics of harmonic to high-voltage three-phase system and low-voltage three-phase system are deduced theoretically.A solution to the problem of resonance and harmonic penetration based on high pass filter is proposed.Finally, the feasibility of applying bilateral power supply to Chuxiong power network is analyzed by using PSD power system analysis software, and it is verified that the external power supply mode will have an impact on the bilateral power supply equalization current.Under normal operation condition, the stability of power system is not affected by bilateral power supply mode.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U223;TM732

【參考文獻】

相關期刊論文 前10條

1 李群湛;;城市軌道交通交流牽引供電系統(tǒng)及其關鍵技術[J];西南交通大學學報;2015年02期

2 趙元哲;李群湛;周福林;;基于阻波高通濾波器的高速鐵路諧振抑制方案[J];電力自動化設備;2015年04期

3 甘國曉;王主丁;李瑞;王啟亮;;配電網(wǎng)合環(huán)沖擊電流計算方法及其簡化計算公式[J];電力系統(tǒng)自動化;2014年20期

4 李群湛;;論新一代牽引供電系統(tǒng)及其關鍵技術[J];西南交通大學學報;2014年04期

5 姜曉鋒;何正友;胡海濤;高仕斌;王斌;;高速鐵路過分相電磁暫態(tài)過程分析[J];鐵道學報;2013年12期

6 盛望群;;電源薄弱地區(qū)電氣化鐵路關鍵技術與接入系統(tǒng)方案研究[J];電氣應用;2013年06期

7 許煒;;探討電氣化鐵路雙邊供電對電力系統(tǒng)的影響[J];科技與企業(yè);2012年12期

8 李曉柯;李祥發(fā);;配電網(wǎng)合環(huán)沖擊電流的暫態(tài)過程分析與仿真[J];機電工程;2010年05期

9 葛少云;李曉明;;基于戴維南等值的配電網(wǎng)合環(huán)沖擊電流計算[J];電力系統(tǒng)及其自動化學報;2007年06期

10 陳霄,王磊,李揚;配電網(wǎng)絡合環(huán)沖擊電流的分析[J];電力自動化設備;2005年04期

相關碩士學位論文 前1條

1 李強;客運專線雙邊供電方案研究[D];西南交通大學;2011年

，

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