通过分析低压隔爆电动机的主要故障类型，针对不对称性短路故障和断相故障提出了采用负序保护原理进行保护的方案。
Based on the analysis of main fault types of LV (Low Voltage) flameproof motor, the negative sequence protection principle is proposed for its asymmetric short circuit fault and open phase fault.
建立了基于模分量大小和三相及零序电流大小的模糊数学模型，能快速准确的识别振荡中发生的不对称故障。
Establish the fuzzy set based on modulus component, three phases and residual current, which can distinguishing unbalance faults from power swing rapidly and reliably.
当交流系统发生三相不对称故障时，忽略直流系统负序分量的准稳态模型将给交直流混合系统的仿真带来较大的误差。
The QSS (Quasi Steady State) model of converter which neglects the negative impedance of DC system will bring some errors when unbalanced fault occurs in AC system.
论述了利用瞬时无功功率理论从三相不对称电流中正确检测出三相正序有功电流，并用计算出的指令电流对系统进行补偿的原理。
Based on the instantaneous reactive power theory the method correctly detects the active positive-ord current from unsymmetrical currents and applies calculated command current to compensate system.
电力有源滤波器能动态补偿不对称三相电路的畸变电流、负序电流分量。
Active power filter can compensate current components which include distortion and negative sequence current components when it is used in unbalanced three-phase circuit.
电力有源滤波器能动态补偿不对称三相电路的畸变电流、负序电流分量。
Active power filter can compensate current components which include distortion and negative sequence current components when it is used in unbalanced three-phase circuit.
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