中国电机工程学报
中國電機工程學報
중국전궤공정학보
Proceedings of the CSEE
2015年
21期
5429-5436
,共8页
振荡中心%薄弱断面%关键支路%轨迹特征%动态识别%控制灵敏度%暂态稳定%控制策略
振盪中心%薄弱斷麵%關鍵支路%軌跡特徵%動態識彆%控製靈敏度%暫態穩定%控製策略
진탕중심%박약단면%관건지로%궤적특정%동태식별%공제령민도%잠태은정%공제책략
oscillation center%weak section%key branch%trajectory characteristic%dynamic identification%control sensitivity indicator%transient stability%control strategy
遭受大扰动故障冲击后，振荡中心落点的交流断面，是互联电网送受端相互“撕裂”趋于失去同步稳定的薄弱断面。关键支路则是薄弱断面中“撕裂”最先发生的支路。识别关键支路，并采取有针对性的控制措施，对提升互联电网输电能力和抗扰能力，具有重要意义。该文以交直流混联多支路外送系统为研究对象，通过持续恶化薄弱断面稳定水平，分析各支路受扰轨迹特征差异；在此基础上，提出了关键支路动态识别方法，并揭示薄弱断面中交流支路相继失稳机制。提出了控制措施与关键支路间有功控制灵敏度评价指标，以及基于该指标的暂态稳定控制策略。实际电网仿真结果，验证了关键支路动态识别方法和稳控策略的有效性。
遭受大擾動故障遲擊後，振盪中心落點的交流斷麵，是互聯電網送受耑相互“撕裂”趨于失去同步穩定的薄弱斷麵。關鍵支路則是薄弱斷麵中“撕裂”最先髮生的支路。識彆關鍵支路，併採取有針對性的控製措施，對提升互聯電網輸電能力和抗擾能力，具有重要意義。該文以交直流混聯多支路外送繫統為研究對象，通過持續噁化薄弱斷麵穩定水平，分析各支路受擾軌跡特徵差異；在此基礎上，提齣瞭關鍵支路動態識彆方法，併揭示薄弱斷麵中交流支路相繼失穩機製。提齣瞭控製措施與關鍵支路間有功控製靈敏度評價指標，以及基于該指標的暫態穩定控製策略。實際電網倣真結果，驗證瞭關鍵支路動態識彆方法和穩控策略的有效性。
조수대우동고장충격후，진탕중심낙점적교류단면，시호련전망송수단상호“시렬”추우실거동보은정적박약단면。관건지로칙시박약단면중“시렬”최선발생적지로。식별관건지로，병채취유침대성적공제조시，대제승호련전망수전능력화항우능력，구유중요의의。해문이교직류혼련다지로외송계통위연구대상，통과지속악화박약단면은정수평，분석각지로수우궤적특정차이；재차기출상，제출료관건지로동태식별방법，병게시박약단면중교류지로상계실은궤제。제출료공제조시여관건지로간유공공제령민도평개지표，이급기우해지표적잠태은정공제책략。실제전망방진결과，험증료관건지로동태식별방법화은공책략적유효성。
Suffered by the large disturbance fault, the ac section with the oscillation central located is the weak link at which the interconnected ac system would be lost synchronization stability and slatted. Having minimum stability margin, the key branch in the ac weak section loses stability firstly. Identifying the key branch and taking effective measures to mitigate the impact on the key branch are of great significance for enhancing the ability to resist disturbance and the transmission capacity. In this paper, aimed at the AC-DC hybrid multi-branch sending system, and based on the disturbed trajectory difference analysis during the process that the stabilization levels continued to deteriorate, the dynamic identification method for the key branch is put forward, and the successive instability mechanism of the multi-branch system is revealed. The sensitivity indicator between control power and the power of key ac branch is defined. The control strategy for improving the stability is proposed based on the sensitivity indictor. Simulation results verify the effectiveness of identification method and the stability control strategy.
