电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2015年
11期
37-44
,共8页
徐敏%蔡泽祥%李晓华%赵建宁%周全%王海军
徐敏%蔡澤祥%李曉華%趙建寧%週全%王海軍
서민%채택상%리효화%조건저%주전%왕해군
直流输电%频变参数%直流控制%行波保护%解析模型%直流线路
直流輸電%頻變參數%直流控製%行波保護%解析模型%直流線路
직류수전%빈변삼수%직류공제%행파보호%해석모형%직류선로
high-voltage direct current (HVDC) transmission%frequency-dependent parameter%high-voltage direct current (HVDC) control%travelling wave protection%analytical modelling%high-voltage direct current(HVDC) line
提出了考虑频变参数和直流控制的直流输电系统线路故障时域解析方法,为直流线路故障分析与故障检测提供了解析基础和实用工具。首先,建立了直流输电系统线路故障的复频域模型,推导了故障电气量的复频域表达式。继而,根据故障行波沿直流线路的传播规律,提出了频变参数的惯性等值模型;根据直流线路故障后直流控制系统的动作规律,提出了直流控制的比例—积分等值模型。进一步,基于频变参数和直流控制等值模型,对复频域故障电气量进行拉氏反变换得到时域表达式,并对解析结果与 EMTDC 仿真结果进行比较,相关结果验证了所提出的解析方法的有效性。最后,探讨了故障解析可能的工程应用场景,以直流线路行波保护为例进行了具体分析,分析结果表明故障解析具有良好的工程应用价值。
提齣瞭攷慮頻變參數和直流控製的直流輸電繫統線路故障時域解析方法,為直流線路故障分析與故障檢測提供瞭解析基礎和實用工具。首先,建立瞭直流輸電繫統線路故障的複頻域模型,推導瞭故障電氣量的複頻域錶達式。繼而,根據故障行波沿直流線路的傳播規律,提齣瞭頻變參數的慣性等值模型;根據直流線路故障後直流控製繫統的動作規律,提齣瞭直流控製的比例—積分等值模型。進一步,基于頻變參數和直流控製等值模型,對複頻域故障電氣量進行拉氏反變換得到時域錶達式,併對解析結果與 EMTDC 倣真結果進行比較,相關結果驗證瞭所提齣的解析方法的有效性。最後,探討瞭故障解析可能的工程應用場景,以直流線路行波保護為例進行瞭具體分析,分析結果錶明故障解析具有良好的工程應用價值。
제출료고필빈변삼수화직류공제적직류수전계통선로고장시역해석방법,위직류선로고장분석여고장검측제공료해석기출화실용공구。수선,건립료직류수전계통선로고장적복빈역모형,추도료고장전기량적복빈역표체식。계이,근거고장행파연직류선로적전파규률,제출료빈변삼수적관성등치모형;근거직류선로고장후직류공제계통적동작규률,제출료직류공제적비례—적분등치모형。진일보,기우빈변삼수화직류공제등치모형,대복빈역고장전기량진행랍씨반변환득도시역표체식,병대해석결과여 EMTDC 방진결과진행비교,상관결과험증료소제출적해석방법적유효성。최후,탐토료고장해석가능적공정응용장경,이직류선로행파보호위례진행료구체분석,분석결과표명고장해석구유량호적공정응용개치。
A time-domain analytical method for line faults on high-voltage direct current (HVDC) transmission system considering frequency-dependent parameters and HVDC control is proposed,providing the analytical basis and utility tool for fault analysis and detection of HVDC lines.Firstly,a complex frequency domain model for line fault of HVDC transmission system is developed and the complex frequency domain expression of fault electrical quantities is derived.Secondly,the inertia equivalent model for frequency-dependent parameters is proposed based on the propagation rule of the faulty travelling wave. The proportional-integral equivalent model for HVDC control is proposed based on the action rule of the HVDC control system after HVDC line fault.Then,inverse Laplace transformation is adopted to obtain the time-domain expressions considering the frequency-dependent parameter and HVDC control equivalent model.A comparison of the analytical results with the simulated ones in EMTDC shows the validity of the proposed analytical method.Finally,potential engineering application scenarios of the analytical method is discussed,e.g.,its successful use in HVDC travelling wave protection. This work is supported by National High Technology Research and Development Program of China (863 Program) (No.2012AA050209) and National Natural Science Foundation of China(No.5 1077055).