Two generating methods of compensation current are also proposed for the purpose of eliminating detuning or limiting harmonic voltage contents , in which the compensation current is the weighted superposition of filter harmonic currents or voltages and the regulating factor 针对消除失谐或限制谐波电压含量的不同控制目标，提出了谐波磁通补偿电流的两种生成方法，补偿电流分别是滤波器电流或母线电压中各次谐波分量与调节系数的加权合成。
In this paper , research status of moa resistive leakage current on - line monitoring is introduced , different monitoring methods are analyzed and influencing factors of monitoring are presented , such as influence of power system ' s harmonic voltages , inter - phase interference , sampling methods on resistive leakage current of moa . in addition , some of these problems are studied deeply 本文介绍了目前moa阻性电流在线监测的研究现状；详细分析了各种阻性电流在线监测方法的优缺点；提出影响moa阻性电流监测的因素和问题，如谐波电压对阻性电流监测的影响，相间干扰对阻性电流监测的影响，全电流的取样方法对阻性监测的影响，并且针对其中的一些问题作了详细的研究。
To resolve the situation that the sensitivity of present ground fault protection schemes is low for the large - sized hydro - generators , a kind of protection scheme based on the fault component of third - harmonic voltage and two kinds of protection scheme based on the fault component of zero - sequence voltage at the terminals and neutral are developed , and they can obtain higher sensitivity and reliability and provide 100 % protection for the stator windings . the influence of noise on the stator ground fault protection based on the local modulus maximum of wavelet transform is analyzed 针对目前大型水轮发电机定子绕组单相接地保护灵敏度偏低的问题，通过分析单相接地故障后机端和中性点零序电压的变化特点，提出了一种基于机端和中性点三次谐波电压故障分量和两种基于机端和中性点零序电压故障分量的高灵敏度、高可靠性保护方案，并实现定子绕组的100 %保护。
To put into operation a large amount of non - linear load , make in harmony wave of rural power grids serious becoming in pollution , pass to rural local electric wire netting main in harmony analysis of wave source , put forward in order to restrain from insert rural power grids in harmony wave source voltage total in harmony wave distortion rate and the containing rate change last device number pulsating for increase of goal , increase the pulse of the current change device and install light specified value electricity active wave filter mix with passive wave filter near the harmonics source to control the wave in harmony 摘要大量非线性负荷的投运，使农村电网的谐波污染日趋严重，通过对农村地方电网主要谐波源的分析，最终提出了以限制接入农村电网的谐波源的电压总谐波畸变率和各次谐波电压含有率为目标的增加换流装置脉动数，以及在谐波源附近装设小额定值的电力有源滤波器配以无源滤波器的混合型电力滤波方式，以进行谐波治理。
In accord with the state standard about harmonic . the harmonic permission value of tangqian line is calculated . some measurement data are shown and analyzed , and some main conclusion is drawed that the 7th harmonic voltages of tangqian line is near to the permission value , total harmonic voltage distortion ratio has oversteped the permission value . the 3th harmonic , the 5th harmonic , the 7th harmonic and the 9th harmonic current from tangqian line all overstep the permission , the largest 5th harmonic current ratio in tangsc reaches 44 % , the 7th harmonic and the 9th harmonic current in tang7c and tangsc is large maybe because the harmonic current is magnified . this paper studies the model of each element in tang yin substation 根据有关公用电网谐波的国家标准，计算出汤牵线注入汤阴变电站的谐波电流允许值，从实测数据可以得出一些重要结论：汤牵线7次谐波电压含有率的最大值接近国标中的限值，汤牵线的谐波电压总畸变率的最大值已超标；汤牵线注入电网的3 、 5 、 7 、 9次谐波电流都超标；汤6c电容器的5次谐波电流含有率较高，最高达到44 ；汤7c和汤8c电容摘要器的7次和9次谐波电流含有率偏高，原因可能是发生了谐波电流放大现象。
Therefore , the power department and users are concerned aboui harmonic and reactive compensation . the power department usually manage compute and measure the electric net " s harmonic condition and connected or new - connected harmonic load . and need to measure the harmonic vol tage current in some electric net " point . then , by manual making an in - depth analysis and statistics on measured - data , it can reduce harmonic harm on public not to take some effective measures 电力部门通常在实际中，需要对电网的谐波状况、已接入和新接入系统的谐波源负荷进行管理、计算及测量，需要对电力网络各点的谐波电压、电流实际水平进行测试，然后对测试数据进行人工分析统计，并以此采取相应措施降低或减少谐波对电网的危害。
