As an example, the proposed method is used for the detection of positive and negative sequence current for an unbalanced three phase power system.
基于瞬时对称分量理论，提出了一种新型的正、负序电流检测方法，并用PSCAD／EMTDC仿真软件进行了验证，结果表明所提方法是正确、可行的。
With rapid computation speed, the method is suitable for the application of practical engineering. As an example, the proposed method is used for the detection of positive and negative sequence current for an unbalanced three phase power system. The simulation results verify the correctness of the proposed method.
基于瞬时对称分量理论，提出了一种新型的正、负序电流检测方法，并用PSCAD/EMTDC仿真软件进行了验证，结果表明所提方法是正确、可行的。
Power system; Three-phase circuit; Nonsi-nusoidal circuit; Unbalanced circuit; Instantaneous reactive power
电力系统；三相电路；非正弦电路；不平衡电路；瞬时无功功率
For the dc current nonlinear control scheme, the dc current controller is parallel to the quadrature line current controller, and a faster dc current transient response is obtained. For the ac current nonlinear control scheme, the dc current controller is cascade to the direct line current controller, which is convenient to design the dc controller and the ac controller independently.2. Under unbalanced operation conditions, a new control method based instantenous active power regulation is proposed, which can not only eliminate the input output harmonics of the CSR but also obtain controllable power factor and sinusoidal line currents. In addition, a ac current controller based sliding-mode control in stationary frames is designed, which simplifis the controller structure and tracking the line current accurately.3. A novel circulating current model of multi-modular CSR is established. For each parallel three phase CSR modular, a new controller structure of the CSR dc side is proposed, which includes a total dc current controller and two current equalization controllers. The proposed structure assures that currents flowing through the upper and lower bridges of each modular are equal and control of the each CSR modular is indenpent since only one signal is shared among modulars.4. A experiment system of three phase CSR is set up and basic experiments are carried on
直流电流非线性解耦控制策略是直流电流控制和网侧无功电流控制并行的控制策略，具有较快的直流电流响应速度；交流电流非线性解耦控制策略是直流电流控制和网侧电流控制级联的控制策略，具有结构简单，便于独立设计直流和交流控制器的特点。2、考虑了电网电压不平衡和滤波器参数三相加热器不对称的情况，提出了基于瞬时有功功率调节的三相CSR的不平衡补偿策略，消除了直流电流脉动分量，实现了网侧可控的功率因数和正弦的交流电流；提出了基于滑模控制的交流电流控制策略，简化了控制器结构，实现了对网侧电流的无差跟踪。3、建立了多模块直接并联CSR的环流模型；对任一并联模块，提出了总直流电流控制器外加2个均流控制器的直流侧控制器结构，保证了流过各模块上、下桥臂的电流均相等，并且各模块加热器仅共享总直流电流控制器输出信号，最大可能地保证了各模块控制的独立性。4、建立了三相CSR实验系统，进行了初步的实验研究。
A new method to calculate apparent power in unbalanced three phase system
一种计算三相不对称系统视在功率的新方法&BG法
The thesis also gave out a new three-dimension complex space power definition based on the synchronous rotating coordinate and this definition can explain all kinds of the instantaneous power component and is suitable for the VSR control and the power analysis of the unbalanced case.
提出了基于同步旋转坐标系的三维复空间瞬时功率定义方法，可以很好的解释三相VSR控制中各瞬时功率分量，适合于三相VSR不平衡控制和功率分析。
The operation of unbalanced three-phase loads of distribution network will increase power loss.
配电网三相负荷不平衡运行将增加配电网的电能损耗。
The critical transverse speed, power response and torsional inherent frequency of shafts for the Three Gorge water-turbine generator set were calculated with transfer matrix under the condition of taking account of many factors effecting on shafts, stability such as unbalanced quality, electromagnetism and water power.
用传递矩阵方法计算了三峡水轮发电机组轴系横向临界转速、动力响应和扭转固有频率，考虑了质量不平衡、电磁不平衡、水力不平衡等影响轴系稳定性的多种因素。
There are five prime indexes of power quality: voltage deviation, frequency deviation, harmonic content, voltage fluctuation and flicker, unbalanced three-phase voltage and current.
电能质量主要有五项基本指标：电压偏差、频率偏差、谐波含量、电压波动和闪变、三相电压不平衡。
The p-q-r instantaneous power theory is introduced, based on which a direct control strategy of UPQC (Unified Power Quality Conditioner) is presented and its implementation in non-linear and unbalanced three-phase four-wire system is discussed.
阐述了p-q-r瞬时功率理论的原理，提出了基于该理论的统一电能质量控制器（UPQC）的直接控制策略，探讨了将其用于三相四线非线性及不平衡系统中的实现方法。
Multi-objective network reconfiguration algorithm for distribution system reliability improvement is advanced based on implicity parallel search method, reliability assessment algorithm and three-phase unbalanced power flow.
提出了基于隐含并行寻优思想的兼顾供电可靠性提高和网损降低的配电系统多目标网络重构算法。
However, there have some factors in low-voltage network in our country, such as: the unbalanced severity of three-phase load, low load ratio, frequent change in power factor, complex running conditions.
然而我国低压配电网中三相负荷不平衡严重，负荷率低，功率因数变化频繁，运行工作情况复杂等因素。
In three-phase four-wire power, The problem of the three-phase unbalancing is influenced by unbalanced loads that impacts safety and stabilization of power system and the low-voltage distribution network.
在三相四线制供电网中，由于负载不对称引起的三相不平衡问题对用电设备以及低压电网的安全稳定运行有较大的危害，严重影响了系统供电的电能质量。
Using this approach, the unbalanced three phase load can be transferred into a balanced to source one and the power factor can be corrected to any desired value.
当三相负荷不对称且功率因数低时，采用这种补偿方法不但可将功率因数补偿到任意指定值，而且可将原来的三相不对称负荷补偿成对于供电电源来说是三相对称的。
Transients in unbalanced three-phase circuit and measurement of power factor
三相不平衡电路的暂态过程及功率因数的测量
Research on Improving Reactive Power Measure Precision for Complete Unbalanced Three-phase Circuit
完全不平衡三相电路无功功率测量精度的探讨
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。
The three-phase current-mode PWM rectifier under the conditions of power imbalances has been studied, and a compensation method of three-phase current curb-side PWM rectifier current net negative sequence components in the state of voltage unbalanced.
对电网不平衡条件下的三相电流型PWM整流器进行了研究，提出了一种在电网电压不平衡状态下，抑制三相电流型PWM整流器网侧电流负序分量的补偿方法。
Research into Control Method of Three-phase Inverter Power Supply Under Unbalanced Load
三相逆变电源在不平衡负载条件下的控制研究
Reactive power compensation of unbalanced three-phase system
三相不平衡系统的无功补偿控制