The active power filter , which can compensate simultaneously the harmonics and reactive power of non - linear loads , is good method to eliminate the harmonic pollution in power system 采用有源滤波器就地吸收谐波源所产生的谐波电流，是消除或限制电力系统谐波污染的一种有效的措施。
Many experts and researchers have made great efforts in a long time . this paper is from the study of theory , analysis the particularity of electrical tractor loads 本文从理论探讨的角度出发，深入了解了国内外对电牵引系统多谐波源随机谐波电流叠加问题的动态，分析了电牵引负荷谐波的分布特性。
This paper aims at studying a measuring method of interharmonics to estimate their parameters ( frequency , amplitude , and initial phase angle ) with the short - time sampling to the signal 本论文的目标就是研究一种间谐波测量的方法，通过对间谐波源信号较短时间的采样，判断出间谐波的频率、幅值和初相角。
Firstly , this paper gives the main harmonic sources and their harms to power systems , and then lists some technique methods now used to handle harmonics . this paper takes tangyin substation as the study object 本文首先介绍了目前电力系统中存在的主要谐波源及其对电力系统的危害，并列出了治理谐波的一些主要技术措施和对这些措施评价。
As an important characteristic parameter in harmonic research , the background harmonic voltage results from high - voltage system harmonic penetration and other harmonic sources in the same level supply system 摘要背景谐波电压是谐波研究中的一个重要特徵参数，其一方面来自上级电网谐波电压的渗透，另一方面来自本级电网其他谐波源的影响。
It can reduce the harmonic or harmonic oscillation in public power net to take some effective measures by making use of this software , and finally reduce the power system accidents and cease time , improve power quality . it is wide application in the future 应用该软件的分析结果采取有效防范措施，可以预防或减少谐波源进入公用电网，减少或降低谐波谐振，进而减少电力事故和停电时间，提高电能质量，应用前景十分广阔。
The power supply & transmit electricity system in guangyuan fulfilled the role of supplying main power to guangyuan city . while the harmonic occurred is very serious and it has not been restrainted . the main harmonic sources are two loads : aluminium electrolysed load and electrized locomotive load 广元电力网主要担负着广元市、县工农业及人民日常生活用电任务，但其谐波极其严重，并且没有进行治理，其主要谐波源负荷为电解铝整流负荷和电气机车牵引负荷。
The pictures of probabilistic characteristic in both sides of impendence matching balance transformers are drawn , and probabilistic density figures are also given . the simulation model of shaoshan 4 electrical tractor is raised , at the same time facing the restriction of probabilistic method , the paper raised that using monte carlo simulation absorbed harmonics currents of the model of electrical tractor and simulated the superposition of low harmonics currents . through compared with real time data , the monte carlo simulation can be confirmed , and the breakthrough point of restriction of using probabilistic method is discussed 为了有效模拟机车在运行中所产生的谐波电流，本文在matlab的平台空间中建立了韶山4型电力机车的仿真模型，导入到matlab运算程序中，对低次谐波电流叠加进行模拟，从而证实了蒙特卡罗模拟法仍然是目前较为可靠可行的方法，同时讨论了在电牵引系统中针对低次多谐波源叠加使用基于中心极限定理的概率分析方法必须使用相关参数进行修正，即需要和电力机车的带电运行方式有机的结合在一起。
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。
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。
