三相不对称负荷造成三相不平衡。
The three-phase asymmetry loads cause the three-phase imbalance.
使用相分量方法在分析电力系统三相不对称网络时更加方便。
Phase components method may offer advantages in the analysis of unbalanced three-phase networks.
提出了一种基于相坐标系的配电网三相不对称解耦的状态估计算法。
A new algorithm for state estimation based on the fast decoupling of distribution system's asymmetrical phases in phase coordinates is proposed.
该方法可实时、准确地检测三相不对称非线性负载电流中的畸变电流，并能自适应跟踪负载电流的变化等。
The method has some advantages. such as real time detection. high accuracy. adaptability to load currents and so on. Theresults o…
以基波潮流和谐波潮流的解耦性为基础，提出了一种将电力系统三相不对称基波潮流和谐波潮流分离迭代的计算方法。
Based on the decoupling of fundamental power flow and harmonic power flow, a separate iteration method for calculating three-phase asymmetrical harmonic power flow in power system is presented.
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.
结果表明了PWM-FCL不但可以快速有效地限制住短路电流，并且在系统发生三相不对称故障时，可以保证故障线路非故障相以及非故障线路的正常运行。
The obtained results show that the PWM-FCL can limit the fault current quickly, and the unfaulted phase(s) and unfaulted line(s) will keep stable operation state when an asymmetry fault occurs.
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.
通过对三相异步电动机空载实验中遇见的故障——三相相间功率的极大不对称性进行分析。
Through analyzing the asymmetry about the power among three phase of the no-load experiments of the triphase asynchronous motor is designed.
利用等效电路，分析了三相异步电动机在不对称电压下的性能和对电机的危害。
By applying equivalent circuits, this paper has analyzed three-phase asynchronous motor property and the harm to generator under asymmetrical voltage.
阐述不对称三相双层分数槽绕组的对称化设计方法。
In this paper set forth the method of symmetric design for three-phase double layer asymmetric fractional slot winding.
通过三相pt对称和不对称两种情况下的计算，得到互感器三相励磁特性对铁磁谐振的影响。
Through the simulations of three phases under the conditions of PT symmetric and asymmetric, the effect of excitation characteristics of three phases' PT on ferroresonance is concluded.
三相电压不对称对永磁同步电动机的性能影响较大。
Three-phase unbalanced voltages have great effects on the performance of a line-start permanent magnet synchronous motor.
基于上述三相交流电弧炉电路模型，分析了电流不对称和阻抗不对称对电弧功率的影响，并讨论了交流电弧炉三相电参数互相影响的复杂性。
The influences of the asymmetry of current and impedance on the arc voltage and power were analyzed, and the investigation complexity was also discussed.
另外，三相四线制有源电力滤波器能有效地抑制零线电流，并能有效地解决系统的不对称问题。
Moreover, three-phase four-wire active filters can suppress zero line current, and solve symmetric problem of system effectively.
单相断线和两相断线是三相电网中最常见的两种故障，占纵向不对称故障的绝大多数。
Single phase broken line and two-phase broken line are two faults easy too see in power system, which account more in all broken line fault.
并通过仿真研究，验证了三相输入信号存在直流偏移、不对称、谐波等干扰情况下，仿真结果与理论推导一致。
The theoretical conclusions are confirmed by detailed simulations under the situations, such as offsetting, unbalance, harmonic, phase-abrupt and frequency-abrupt.
本论文所论述的系统采用MSP430F149单片机通过不对称规则采样法来输出高精度的三相spwm波形，从而实现了逆变器的SPWM控制。
The system adopts MSP430F149 MCU and asymmetry regular-sampling strategy to output high precision SPWM wave, consequently transducer's SPWM control is realized.
三相负荷不平衡以及系统元件三相参数不对称都会引起电力系统三相不平衡。
The definition and national standard of three-phase unbalance in power system were expatiated.
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.
配电系统三相电压的不对称会对用户造成一系列不利影响。
Voltage unbalance of three phase ac distribution systems adversely affects power customers.
提出一种电网电压不对称情况下抑制三相脉宽调制(PWM)电流型变流器(CSC)直流输出电流二次谐波、减少网侧电流低次谐波的控制方法。
This paper presents a new control strategy to eliminate second harmonic of dc output current in the 3-phase unbalanced network voltage PWM current-source converters (CSC).
提出一种电网电压不对称情况下抑制三相脉宽调制(PWM)电流型变流器(CSC)直流输出电流二次谐波、减少网侧电流低次谐波的控制方法。
This paper presents a new control strategy to eliminate second harmonic of dc output current in the 3-phase unbalanced network voltage PWM current-source converters (CSC).
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