广东电力
廣東電力
엄동전력
GUANGDONG ELECTRIC POWER
2014年
11期
71-76
,共6页
反时限保护%能力曲线%大型发电机%最优拟合%热量累积
反時限保護%能力麯線%大型髮電機%最優擬閤%熱量纍積
반시한보호%능력곡선%대형발전궤%최우의합%열량루적
time-inverse protection%capability curve%large generator%optimal matching%heat accumulation
针对现有发电机反时限保护动作特性不能与其能力曲线完全匹配的问题,提出一种基于能力曲线最优拟合的大型发电机反时限保护。通过对发电机的发热物理过程建模,推导出发电机热量累积的表达式,并将其作为保护的动作关系式;利用最小二乘法对关系式中系数进行拟合,实现动作特性曲线与发电机能力曲线的最优匹配。保护实现算法物理意义明确,能够准确反映发电机在异常工况下热量累积的动态过程,在保证机组安全的前提下充分发挥了机组的能力和效益,增强了大型机组对电网安全稳定运行的支撑作用。算例分析验证了该方法的有效性和合理性。
針對現有髮電機反時限保護動作特性不能與其能力麯線完全匹配的問題,提齣一種基于能力麯線最優擬閤的大型髮電機反時限保護。通過對髮電機的髮熱物理過程建模,推導齣髮電機熱量纍積的錶達式,併將其作為保護的動作關繫式;利用最小二乘法對關繫式中繫數進行擬閤,實現動作特性麯線與髮電機能力麯線的最優匹配。保護實現算法物理意義明確,能夠準確反映髮電機在異常工況下熱量纍積的動態過程,在保證機組安全的前提下充分髮揮瞭機組的能力和效益,增彊瞭大型機組對電網安全穩定運行的支撐作用。算例分析驗證瞭該方法的有效性和閤理性。
침대현유발전궤반시한보호동작특성불능여기능력곡선완전필배적문제,제출일충기우능력곡선최우의합적대형발전궤반시한보호。통과대발전궤적발열물리과정건모,추도출발전궤열량루적적표체식,병장기작위보호적동작관계식;이용최소이승법대관계식중계수진행의합,실현동작특성곡선여발전궤능력곡선적최우필배。보호실현산법물리의의명학,능구준학반영발전궤재이상공황하열량루적적동태과정,재보증궤조안전적전제하충분발휘료궤조적능력화효익,증강료대형궤조대전망안전은정운행적지탱작용。산례분석험증료해방법적유효성화합이성。
Aiming at problem of incomplete matching of time-inverse protection action characteristic of existing generator with its capability curve,a kind of time-inverse protection of large generators based on capability curve was proposed. By modeling for heating physical process of generators,expression of heat accumulation of generators was deduced which was regarded as action relational expression of protection. Matching for coefficients in relational expression was carried out by means of least square method for realizing optimal matching of action characteristic curve and generator capability curve. Physical significance of protection realization algorithm was explicit to correctly reflect dynamic process of heat accumula-tion of generators under abnormal working conditions as well as fully develop capability and benefit of the unit and increase support role of large generators in ensuring safe and stable operation of the power grid on the premise of ensuring safety of the unit. Example analysis verified effectiveness and reasonability of this method.