中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2014年
10期
1556-1565
,共10页
郑超%马世英%盛灿辉%罗立波%林俊杰%刘道伟%秦晓辉%薛劲莹%张志强%陈得治
鄭超%馬世英%盛燦輝%囉立波%林俊傑%劉道偉%秦曉輝%薛勁瑩%張誌彊%陳得治
정초%마세영%성찬휘%라립파%림준걸%류도위%진효휘%설경형%장지강%진득치
特高压交流%互联电网%功率涌动%网架结构%转动惯量%广义驱动能量%振荡耦合%缓解措施
特高壓交流%互聯電網%功率湧動%網架結構%轉動慣量%廣義驅動能量%振盪耦閤%緩解措施
특고압교류%호련전망%공솔용동%망가결구%전동관량%엄의구동능량%진탕우합%완해조시
UHVAC%interconnected power grid%power surging%network structure%rotational inertia%generalized driving energy%oscillation coupling%mitigation measures
华北电网与华中电网特高压交流互联后，位于华中电网西部末端且与互联通道电气距离最远的四川电网，其网内枢纽电站及其出线故障将会引发特高压通道功率大幅涌动，并成为约束南北电力互济的重要因素之一。首先分析了华北-华中特高压互联电网网架拓扑结构与转动惯量分布特征；基于所定义的广义驱动能量，揭示华中不同省级电网故障扰动后，特高压通道华中侧落点电网的注入能量差异；通过理想主导振荡模态及大电网仿真轨迹分析，指出过渡期电网固有结构所决定的振荡机群同调性和振荡耦合叠加性，是导致四川网内故障激发大区振荡首摆驱动能量和反摆制动能量显著增大，进而引发特高压通道功率大幅涌动的根本原因。基于广义驱动能量的影响因素分析，提出相应的缓解措施。该研究可提升特高压大电网动态行为机制的认知能力和大电网安全稳定运行的驾驭能力。
華北電網與華中電網特高壓交流互聯後，位于華中電網西部末耑且與互聯通道電氣距離最遠的四川電網，其網內樞紐電站及其齣線故障將會引髮特高壓通道功率大幅湧動，併成為約束南北電力互濟的重要因素之一。首先分析瞭華北-華中特高壓互聯電網網架拓撲結構與轉動慣量分佈特徵；基于所定義的廣義驅動能量，揭示華中不同省級電網故障擾動後，特高壓通道華中側落點電網的註入能量差異；通過理想主導振盪模態及大電網倣真軌跡分析，指齣過渡期電網固有結構所決定的振盪機群同調性和振盪耦閤疊加性，是導緻四川網內故障激髮大區振盪首襬驅動能量和反襬製動能量顯著增大，進而引髮特高壓通道功率大幅湧動的根本原因。基于廣義驅動能量的影響因素分析，提齣相應的緩解措施。該研究可提升特高壓大電網動態行為機製的認知能力和大電網安全穩定運行的駕馭能力。
화북전망여화중전망특고압교류호련후，위우화중전망서부말단차여호련통도전기거리최원적사천전망，기망내추뉴전참급기출선고장장회인발특고압통도공솔대폭용동，병성위약속남북전력호제적중요인소지일。수선분석료화북-화중특고압호련전망망가탁복결구여전동관량분포특정；기우소정의적엄의구동능량，게시화중불동성급전망고장우동후，특고압통도화중측낙점전망적주입능량차이；통과이상주도진탕모태급대전망방진궤적분석，지출과도기전망고유결구소결정적진탕궤군동조성화진탕우합첩가성，시도치사천망내고장격발대구진탕수파구동능량화반파제동능량현저증대，진이인발특고압통도공솔대폭용동적근본원인。기우엄의구동능량적영향인소분석，제출상응적완해조시。해연구가제승특고압대전망동태행위궤제적인지능력화대전망안전은정운행적가어능력。
ABSTRACT:After the interconnection of North China Power Grid (NCPG) and Central China Power Grid (CCPG) by UHVAC, a short-circuit fault of Sichuan network may trigger a substantial power surging through UHVAC channel and will restrict the transmission capacity. In this paper, the characteristics of network structure and rotational inertia distribution were analyzed for CCPG firstly. Based on generalized driving energy, the divergence of power surge peak caused by faults happened at different provincial grids is revealed. By the ideal oscillation mode and grid simulation trajectory analysis, the paper points out that the two dominant oscillation frequency closing to 1:2 determined by the inherent structure of the UHVAC transition period is the primary cause for significant power surging of UHVAC channel. Furthermore, the influence factors of generalized driving energy are studied and corresponding mitigation measures are put forward. Conclusion drawn by this paper is important to enhance the cognitive abilities of the dynamic behavior and the control abilities of stable operation for UHVAC interconnected gird.
