【摘要】：隨著遠(yuǎn)距離大容量直流輸電陸續(xù)投運(yùn),區(qū)域電網(wǎng)互聯(lián)方式呈現(xiàn)特高壓、遠(yuǎn)距離、大范圍互聯(lián)、大容量區(qū)域功率交換的交直流混聯(lián)新特征。首先抽象出直流輸電在區(qū)域電網(wǎng)互聯(lián)中的基本結(jié)構(gòu),大規(guī)模交直流區(qū)域互聯(lián)結(jié)構(gòu)存在直流通道故障后潮流轉(zhuǎn)移至交流通道,并引起功角失穩(wěn)的系統(tǒng)性風(fēng)險(xiǎn)。接著,從電網(wǎng)安全性與輸電經(jīng)濟(jì)性角度出發(fā),提出交流輸電通道強(qiáng)度指標(biāo)、交直流輸電通道強(qiáng)度比指標(biāo)和交流輸電通道效用指標(biāo),分別定量刻畫交流通道輸電能力、強(qiáng)直弱交程度和交流通道經(jīng)濟(jì)利用程度,并提出交直流同步電網(wǎng)異步分隔的一般性原則。最后,以南方電網(wǎng)2030年4省同步規(guī)劃方案為例,指標(biāo)計(jì)算結(jié)果表明,云南電網(wǎng)外送交直流通道為典型的"強(qiáng)直弱交"結(jié)構(gòu),暫態(tài)穩(wěn)定裕度與交流通道效用指標(biāo)低,宜解開交流聯(lián)絡(luò)線異步運(yùn)行,同時(shí)N-1與N-2暫態(tài)仿真結(jié)果亦驗(yàn)證了上述計(jì)算結(jié)果的合理性。
[Abstract]:With the operation of long-distance and large-capacity DC transmission, the interconnection mode of regional power grid presents the new characteristics of UHV, long-distance, large-scale interconnection and large-capacity regional power exchange. Firstly, the basic structure of DC transmission in regional power grid interconnection is abstracted. The large-scale AC / DC regional interconnection structure has the systematic risk of power flow transfer to AC channel after DC channel failure, and cause power angle instability. Then, from the point of view of power network security and transmission economy, the strength index of AC transmission channel, the strength ratio index of AC / DC transmission channel and the utility index of AC transmission channel are put forward to describe the transmission capacity of AC channel quantitatively. The degree of strong direct and weak AC and the economic utilization of AC channel are put forward, and the general principle of asynchronous separation of AC / DC synchronous power grid is put forward. Finally, taking the synchronous planning scheme of four provinces in Southern Power Grid in 2030 as an example, the calculation results show that the DC channel outside Yunnan Power Grid is a typical "strong direct and weak AC" structure, and the transient stability margin and the utility index of AC channel are low. It is appropriate to untie the asynchronous operation of AC tie line, and the transient simulation results of N 鈮，

本文編號：2486928