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
5期
6-9
,共4页
谐振接地%失谐量%消弧线圈%跟踪调谐%中性点电压
諧振接地%失諧量%消弧線圈%跟蹤調諧%中性點電壓
해진접지%실해량%소호선권%근종조해%중성점전압
resonant grounded system%detuning size%arc-suppression coil%tracking tuning%neutral voltage
为实现消弧线圈的跟踪调谐,提出基于失谐量(ωCΣ-1/(ωL))的消弧线圈跟踪调谐方法.对于消弧线圈并阻尼电阻接地的配电网,改变消弧线圈并联阻尼电阻的大小,测量中性点电压的幅值和相位.通过相位的变化便可判断消弧线圈的补偿状态,根据中性点电压的幅值、阻尼电导和现有的消弧线圈电感值即可计算失谐量,以此失谐量作为反馈量可求出线路对地电容的大小,进而调节消弧线圈可实现电网无功电流的跟踪控制补偿.通过Matlab进行相应的仿真计算,表明变阻尼测量对系统运行影响小,在预调式和随调式消弧线圈中均可使用.
為實現消弧線圈的跟蹤調諧,提齣基于失諧量(ωCΣ-1/(ωL))的消弧線圈跟蹤調諧方法.對于消弧線圈併阻尼電阻接地的配電網,改變消弧線圈併聯阻尼電阻的大小,測量中性點電壓的幅值和相位.通過相位的變化便可判斷消弧線圈的補償狀態,根據中性點電壓的幅值、阻尼電導和現有的消弧線圈電感值即可計算失諧量,以此失諧量作為反饋量可求齣線路對地電容的大小,進而調節消弧線圈可實現電網無功電流的跟蹤控製補償.通過Matlab進行相應的倣真計算,錶明變阻尼測量對繫統運行影響小,在預調式和隨調式消弧線圈中均可使用.
위실현소호선권적근종조해,제출기우실해량(ωCΣ-1/(ωL))적소호선권근종조해방법.대우소호선권병조니전조접지적배전망,개변소호선권병련조니전조적대소,측량중성점전압적폭치화상위.통과상위적변화편가판단소호선권적보상상태,근거중성점전압적폭치、조니전도화현유적소호선권전감치즉가계산실해량,이차실해량작위반궤량가구출선로대지전용적대소,진이조절소호선권가실현전망무공전류적근종공제보상.통과Matlab진행상응적방진계산,표명변조니측량대계통운행영향소,재예조식화수조식소호선권중균가사용.
A measurement method named new type automatic tuning arc-suppression coil based on detuning size is proposed to achieve the tracking of the arc-suppression coil tuning. The damping resistor of arc-suppression coil with parallel resistance is changed, and the phase position and amplitude of the neutral voltage are measured. The compensation status of the arc-suppression coil can be identified through the phase change. According to the neutral point voltage amplitude, the damping conductance and existing arc-suppression coil inductance value, the detuning size can be calculated. Taking detuning size as a feedback, the system ground capacitance is calculated, and then by adjusting the arc-suppression coil the tracking compensation for reactive current can be achieved. The corresponding simulation is carried out by using MATLAB. Simulation results show that change damping measurement has little effect on the system and can be used both in the control of a follow-resonant or pre-resonant arc-suppression coil.
