一、儲能變流器是什么
儲能變流器(Power Conversion System)英文簡稱PCS,又(you)稱儲能逆變器,可控(kong)制蓄電(dian)(dian)池的充電(dian)(dian)和放電(dian)(dian)過程,進行交直流的變換,在無電(dian)(dian)網情況下可以直接為(wei)交流負荷供電(dian)(dian)。
儲能變(bian)流器PCS由(you)DC/AC雙向(xiang)變(bian)流器、控制(zhi)單元等構成。PCS控制(zhi)器通(tong)過通(tong)訊接收后臺(tai)控制(zhi)指令(ling),根(gen)據(ju)功率指令(ling)的(de)符號及大小控制(zhi)變(bian)流器對電(dian)池(chi)(chi)進行(xing)充(chong)電(dian)或放(fang)電(dian),實現對電(dian)網(wang)有(you)功功率及無功功率的(de)調節。PCS控制(zhi)器通(tong)過CAN接口與BMS通(tong)訊,獲取(qu)電(dian)池(chi)(chi)組狀態信息,可實現對電(dian)池(chi)(chi)的(de)保(bao)護性充(chong)放(fang)電(dian),確保(bao)電(dian)池(chi)(chi)運行(xing)安全。
二、光伏逆變器是什么
光伏逆變器英文(wen)名為PV inverter,是指可將(jiang)光(guang)伏太陽能板產(chan)生的(de)可變直流電(dian)(dian)壓轉(zhuan)換為市電(dian)(dian)頻率交流電(dian)(dian)的(de)逆(ni)變器,通常被輸電(dian)(dian)系統、電(dian)(dian)網、電(dian)(dian)站(zhan)應用,是光(guang)伏陣列(lie)系統中(zhong)重(zhong)要的(de)系統平(ping)衡(BOS)之一。
光伏(fu)逆變(bian)(bian)器的(de)缺點是只能(neng)(neng)(neng)在白(bai)天發(fa)電(dian)(dian),發(fa)電(dian)(dian)功率(lv)易受到天氣(qi)影響等,針對這些問(wen)題,儲(chu)能(neng)(neng)(neng)逆變(bian)(bian)器成(cheng)功問(wen)世。當負荷低谷時,儲(chu)能(neng)(neng)(neng)逆變(bian)(bian)器將輸出(chu)電(dian)(dian)能(neng)(neng)(neng)用蓄電(dian)(dian)池存儲(chu)。當負荷高(gao)峰時,儲(chu)能(neng)(neng)(neng)逆變(bian)(bian)器將釋放存儲(chu)的(de)電(dian)(dian)能(neng)(neng)(neng),以減少對電(dian)(dian)網(wang)的(de)壓力。當電(dian)(dian)網(wang)陷入故障(zhang)時,儲(chu)能(neng)(neng)(neng)逆變(bian)(bian)器可切換成(cheng)離網(wang)模式(shi)繼續供電(dian)(dian)。
三、儲能變流器和光伏逆變器的區別
1、自用率
儲能逆變器的自用率最高可到80%。光(guang)伏逆變器的自用率通常在(zai)20%左右。
2、市電故障
當市電故障(zhang)時(shi),光伏(fu)逆(ni)變(bian)器將陷入癱瘓狀(zhuang)態,儲能(neng)逆(ni)變(bian)器可轉(zhuan)換離網(wang)模(mo)式高(gao)效供電。
3、收益
在(zai)并網發電補貼下調(diao)的背景下,儲(chu)能(neng)逆變(bian)器(qi)收益(yi)將比光伏逆變(bian)器(qi)更(geng)高(gao)。
4、天氣因素
光伏逆變器有多種限制,如只能白天發電、發電功率受天氣影響、具有不可預見性等。儲能逆變器沒有以上問題。