| 1. | Positive sequence polyphase system
正序多相系统 |
| 2. | This thesis proposed a real - time detection method for fundamental negative - and positive - sequence based on space vector
本文提出了一种基于空间矢量概念的基波正序、负序分量实时提取新方法。 |
| 3. | 3 . the dissertation proposes the extended kalman filter based to estimate the fundamental symmetrical component of the ps and the frequency while the frequency is unknown
在电动机变频调速系统的频率未知条件下，给出了基本正序对称分量和频率估计的扩展卡尔曼滤波方法。 |
| 4. | Thus this thesis presents a method to estimate length and positive parameters of transmission line , and a method to estimate length , positive parameters and zero parameters of line at one time
由此，本文提出了一种利用故障前的电气量来校正线路正序参数和长度的方法，以及一种利用区内出现的缺相运行情况对线路正序、零序参数和长度同时进行校正的方法。 |
| 5. | The ideal power system needs to be supplied with sine voltage whose frequency and amplitude are both stable . to three - phase ac power system , the currents and voltages must be equal of amplitude and the phase - shift between each other should be 120 of positive order
理想的电力系统要求以频率和幅值稳定的正弦电压进行供电；对于三相交流电力系统，各相电压和电流应处于幅值大小相等、相位互差120的正序对称状态。 |
| 6. | Based on the adaptive interference canceling theory and the concept of space vector , an adaptive fundamental positive / negative sequence component and harmonic component detecting method is developed . due to the close loop structure , this method has quite good robustness , and can meet the requirement of the asymmetrical control of hvdc - vsc well
运用自适应干扰对消原理和空间矢量的概念，提出了一种基波正序分量、基波负序分量及谐波分量的自适应检测方法，并进行了详细的理论分析，为研究hvdc - vsc的不对称运行控制奠定了基础。 |
| 7. | In order to improve the behavior of transformer protection that is incomplete at present in distinguishing magnetizing inrush current from fault current , the paper puts forward a kind of new principle of transformer differential protection after analyzing the characteristic of magnetizing inrush and active power consume of transformers . this protection uses differential protection based on positive sequence active power as a criterion to discriminate internal faults from magnetizing inrush , and ratio restraint differential current protection as a signal to touch off the protection
针对当前电力系统中变压器保护由于励磁涌流鉴别理论不完善而导致的误动率相对较高的问题，论文在分析了变压器励磁涌流特性和有功损耗的基础上，提出了用变压器正序有功功率差动作为区别励磁涌流和故障电流的判据，并以成熟的比率制动差流保护作为内外部故障判据的变压器主保护。 |
| 8. | On the analysis of the theory of instantaneous reactive power , the paper brings forward a new harmonic detection method based on multiple frequency transform . the detection theory of positive sequence harmonic and negative sequence harmonic is respectively proved in detail . the correlative concepts are defined and the simulation validates the feasibility of this method
本文在分析瞬时无功功率理论的基础上，提出了一种基于倍频旋转变换的谐波测量方法，分别针对正序和负序分量，从理论上证明了该方法能分离出单个的谐波，给出了相关量的定义，最后通过仿真验证了该方法的有效性。 |
| 9. | On the west limb , there are andesite clasts at the lower section and limestone clasts at the upper section , which indicates normal stratigraphic sequence in its provenance . on the east limb , there are dolomite clasts at the lower section and limestone clasts at the upper section , which indicates reversed stratigraphic sequence in its provenance
西翼砾岩在剖面上具明显的倒序岩屑地层特征，反映了物源区正常的层序地层，而东翼砾岩在剖面上仍然是正序的岩屑地层，反映了物源区非正常的层序地层。 |
| 10. | Abstract : applying the frequency - domain representation of the complex signals in a three - phase system , a harmonic detection method based on the in - phase correlation filtering was put forward in this paper , which can be used to detect effectively the generalized harmonics in the three - phase system except the fundamental of positive sequence
文摘:采用三相系统复信号的频域表示并根据频谱搬移原理，本文提出了一种基于同步相关滤波的谐波检测方法，可用于三相电路中除正序基波以外广义谐波的有效检测。 |
