电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2014年
5期
104-109
,共6页
张执超%王增平%方攀宇
張執超%王增平%方攀宇
장집초%왕증평%방반우
运行状态%有功功率平衡%频率稳定%电压稳定%切负荷%紧急控制
運行狀態%有功功率平衡%頻率穩定%電壓穩定%切負荷%緊急控製
운행상태%유공공솔평형%빈솔은정%전압은정%절부하%긴급공제
operating state%active power balance%frequency stability%voltage stability%load shedding%emergency control
研究了电力系统的运行状态分类及其之间的转换关系，建立简单的单机负荷模型系统的状态方程，重点研究系统的稳态及紧急运行状态。电力系统中出现大的扰动，系统中将出现有功、无功功率的不平衡。借助 Matlab仿真分析系统频率和电压的运行轨迹变化，结果表明，频率是系统有功功率平衡的指示器，而无功功率不平衡决定母线电压的变化，在紧急状态下，系统频率和电压稳定是不能完全解耦的。该研究对传统的低频减载策略设计和改进具有重要的指导意义。
研究瞭電力繫統的運行狀態分類及其之間的轉換關繫，建立簡單的單機負荷模型繫統的狀態方程，重點研究繫統的穩態及緊急運行狀態。電力繫統中齣現大的擾動，繫統中將齣現有功、無功功率的不平衡。藉助 Matlab倣真分析繫統頻率和電壓的運行軌跡變化，結果錶明，頻率是繫統有功功率平衡的指示器，而無功功率不平衡決定母線電壓的變化，在緊急狀態下，繫統頻率和電壓穩定是不能完全解耦的。該研究對傳統的低頻減載策略設計和改進具有重要的指導意義。
연구료전력계통적운행상태분류급기지간적전환관계，건립간단적단궤부하모형계통적상태방정，중점연구계통적은태급긴급운행상태。전력계통중출현대적우동，계통중장출현유공、무공공솔적불평형。차조 Matlab방진분석계통빈솔화전압적운행궤적변화，결과표명，빈솔시계통유공공솔평형적지시기，이무공공솔불평형결정모선전압적변화，재긴급상태하，계통빈솔화전압은정시불능완전해우적。해연구대전통적저빈감재책략설계화개진구유중요적지도의의。
The classification of system running state is determined and the transformational relation among them is studied. State equations are constructed about simple single generator-load model system. Steady state and the state of emergency running are focused. The occurrence of a large disturbance in a power system can arouse active and reactive power imbalances. System frequency and voltage trajectory are simulated and analyzed with Matlab. The results show that the frequency is an indicator of real power balance and reactive power imbalance determines the change of bus voltage. Frequency and voltage stability cannot be decoupled completely under emergency situations. This conclusion has an important guiding significance for the design and improvement of traditional under frequency load shedding (UFLS) strategy.
