1)可以長距離、大容量輸送電力
R88M-WP75030T內地76%的煤炭資源在北部和西北部,80%的水能資源在西南部,而70%以上的能源需求在中東部,普通電網的傳輸距離只有500公里左右,無法滿足傳輸要求。1000千伏交流特高壓的輸電功率是500千伏交流的4~5倍,經濟輸電距離是500千伏交流的3倍。
2)降低輸送損耗
R88M-WP75030T在導線總截面、輸送容量均相同的情況下,±800千伏直流線路的電阻損耗是±500千伏直流線路的39%,是±600千伏級直流線路的60%,提高輸電效率,節(jié)省運行費用。
3)節(jié)省工程投資
800千伏直流輸電方案的單位輸送容量投資約為±500千伏直流輸電方案的72%。溪洛渡、向家壩、烏東德、白鶴灘水電站送出工程采用±800千伏級直流與采用±620千伏級直流相比,輸電線路可以從10回減少到6回,并節(jié)約綜合投資約150億元。
4)走廊利用率高
±800千伏、640萬千瓦直流輸電方案的線路走廊為76米,單位走廊寬度輸送容量為8.4萬千瓦/米,是±500千伏、300萬千瓦方案和±620千伏、380萬千瓦方案的1.3倍左右,提高輸電走廊利用效率,節(jié)省寶貴的土地資源;由于單回線路輸送容量大,顯著節(jié)省山谷、江河跨越點的有限資源。
5)統(tǒng)籌利用環(huán)境容量,優(yōu)化煤電布局特高壓優(yōu)勢
1)可以長距離、大容量輸送電力
R88M-WP75030T內地76%的煤炭資源在北部和西北部,80%的水能資源在西南部,而70%以上的能源需求在中東部,普通電網的傳輸距離只有500公里左右,無法滿足傳輸要求。1000千伏交流特高壓的輸電功率是500千伏交流的4~5倍,經濟輸電距離是500千伏交流的3倍。
2)降低輸送損耗
在導線總截面、輸送容量均相同的情況下,±800千伏直流線路的電阻損耗是±500千伏直流線路的39%,是±600千伏級直流線路的60%,提高輸電效率,節(jié)省運行費用。
3)節(jié)省工程投資
800千伏直流輸電方案的單位輸送容量投資約為±500千伏直流輸電方案的72%。溪洛渡、向家壩、烏東德、白鶴灘水電站送出工程采用±800千伏級直流與采用±620千伏級直流相比,輸電線路可以從10回減少到6回,并節(jié)約綜合投資約150億元。
4)走廊利用率高
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