從最早的在牽引變電所設置再生能量電阻消耗裝置的應用到近幾年電容儲能、再生電能逆變回饋設備發展,再生制動能量吸收技術在不斷研制和持續改進,在國內外軌道交通線路上得到應用。再生能量電阻消耗裝置,其主要缺點是只能將電能轉換為熱能消耗掉,造成能源浪費,而且電阻散熱會導致溫度升高,因此需要增加相應的通風裝置,即同時增加相應的電能消耗。電容儲能型,將制動能量吸收到大容量電容器組中,當供電區間有列車需要時將所儲存的電能釋放出去,其主要缺點是要設置體積龐大的電容器組,且電容因頻繁處于充放電狀態而導致使用壽命短。再生電能逆變回饋設備,是將車輛制動時產生能量經過逆變變成工頻交流電與車站內電網并網,該吸收方式有利于能源的綜合再利用,實現了節能,是目前日益重視并大力推廣的方式。
新風光研制的再生制動能量吸收逆變裝置為逆變回饋型,其回饋能量將直接用于車站內400V負載或經變壓器反送至10kV//35kV電網。再生制動能量吸收逆變裝置根據各個傳感器檢測信號,綜合判斷直流電網上是否有列車處于再生電制動狀態,一旦確認列車處于再生制動狀態并需要吸收能量時,系統啟動吸收過程。逆變裝置把機車剎車制動時產生的能量轉換成AC400V電壓,自動跟蹤AC400V母線電壓,并向負載供電,將再生能量消耗在用電設備上,確保機車充分有效利用電制動。在直流牽引供電系統中,再生電能吸收裝置為一個子系統工程,其作用關乎系統的安全。
2 南京某線路牽引供電系統概況
南京軌道交通其牽引供電系統在機車牽引變電所,2-4公里就設置一個機車牽引變電所,每個機車牽引所都需要配備再生制動能量吸收設備。
南京牽引供電系統主要分為直流牽引網和交流配電網兩部分。主變電所將三相35kV高壓交流送至各牽引所,經整流變壓器、整流器變成適合軌道車輛應用的1500V直流母線,饋電線再將直流電送到接觸網上,接觸網是沿車輛走行軌架設的特殊供電線路,軌道車輛通過其受流器與接觸網的直接接觸而獲得電能。
本工程供電系統主要參數如表1所示。
再生制動能量吸收逆變裝置是新風光電子科技股份有限公司自主研發,擁有完全的自主知識產權suggests, is to stack the corrugated board evenly and neatly according to the set number of sheets. In the corrugated paper production line, the paperboard becomes the standard paperboard after gluing, bonding, slitting and cross cutting. At this time, in order to facilitate the subsequent process processing, the paperboard must be stacked evenly, so the stacking model is an indispensable equipment in the corrugated paper production line.
According to different palletizing products and different subsequent processes, there are many forms of palletizing machines, such as gantry type and basket type, but the main core processes are as follows:
1. Order management function: edit and save the order, display and automatically update the order to be processed. When saving the order edited by the user, judge whether it is a legal order. If it is illegal, it will not be saved and an error prompt will be given;
2. Intelligent multi-stage control of paper feeding pressure enables the paperboard after high-speed cross cutting to enter the stacker smoothly;
3. Multi section independent transmission, AC frequency converter and AC frequency conversion motor coop