电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2013年
19期
1-6
,共6页
功率平衡%频率稳定%电压稳定%频率变化率%电压灵敏度%低频减载
功率平衡%頻率穩定%電壓穩定%頻率變化率%電壓靈敏度%低頻減載
공솔평형%빈솔은정%전압은정%빈솔변화솔%전압령민도%저빈감재
power balance%frequency stability%voltage stability%frequency rate of change%voltage sensitivity%under frequency load shedding(UFLS)
低频减载（Under Frequency Load Shedding, UFLS）是电力系统中普遍采用的技术，它通过在系统的某些地点切除过负荷量，达到维护系统稳定的目的。为了改进和提高传统的策略，很多研究者都考虑采用频率变化率作为指示器，用于确定系统的有功功率缺额。重点研究了影响频率变化率测量值的因素，分析了频率变化率在使用中遇到的相关问题，在此基础上，得出系统扰动后不平衡功率的准确求解表达式。一个综合利用电压信息量来确定切负荷地点和切负荷量的新UFLS策略被提出，仿真结果表明，新的切负荷策略更具有优越性。
低頻減載（Under Frequency Load Shedding, UFLS）是電力繫統中普遍採用的技術，它通過在繫統的某些地點切除過負荷量，達到維護繫統穩定的目的。為瞭改進和提高傳統的策略，很多研究者都攷慮採用頻率變化率作為指示器，用于確定繫統的有功功率缺額。重點研究瞭影響頻率變化率測量值的因素，分析瞭頻率變化率在使用中遇到的相關問題，在此基礎上，得齣繫統擾動後不平衡功率的準確求解錶達式。一箇綜閤利用電壓信息量來確定切負荷地點和切負荷量的新UFLS策略被提齣，倣真結果錶明，新的切負荷策略更具有優越性。
저빈감재（Under Frequency Load Shedding, UFLS）시전력계통중보편채용적기술，타통과재계통적모사지점절제과부하량，체도유호계통은정적목적。위료개진화제고전통적책략，흔다연구자도고필채용빈솔변화솔작위지시기，용우학정계통적유공공솔결액。중점연구료영향빈솔변화솔측량치적인소，분석료빈솔변화솔재사용중우도적상관문제，재차기출상，득출계통우동후불평형공솔적준학구해표체식。일개종합이용전압신식량래학정절부하지점화절부하량적신UFLS책략피제출，방진결과표명，신적절부하책략경구유우월성。
Under frequency load shedding (UFLS) technology is widely used in power system. It significantly ensures the stability of the power system by means of shedding excessive loads in certain places. In order to improve the traditional UFLS scheme, many researchers are taking the frequency rate of change as indicator of determining the shortage of the active power in the power system. In this research, a new function is created to calculate the power imbalance by analyzing the factors that influence the measure of the frequency change rate as well as the related problems in the application of the frequency change rate. Moreover, a new method that utilizes the voltage sensitivity to determine the location and the corresponding quantity of the load shedding is proposed. The simulation results show that the new approach is superior.
