摘要随着技术的进步，供电部门与用户之间由于谐波问题引发的矛盾日益突出，因此迫切需要解决谐波评估。目前国内外对于用户在电力系统公共连接点（Point of Common Coupling，PCC）处谐波发射水平的计算主要是基于系统阻抗的方法。本论文对谐波原理、产生原因、危害进行了概略阐述，采用PCC处的系统及各个用户的谐波责任分离方法。该方法采用基于参考阻抗的戴文南—诺顿混合等效模型，利用电压矢量叠加原理，将系统及各个用户对该PCC谐波电压的贡献量进行细化，对系统及各个用户的谐波责任百分比进行明确量化。再通过Multisim 7仿真验证该方法的准确性和合理性。5557
关键词 谐波 PCC 谐波分离 谐波责任 电压矢量叠加 诺顿等效 戴文南等效 Multisim 7
毕业设计说明书（毕业论文）外文摘要
Title Simulation and Evaluation for Harmonics of Distribution network point of common coupling
Abstract
As technology advances, structure of Load is increasingly complex and persified Caused by harmonic problems in the electricity sector and users have become increasingly prominent，therefore we have an urgent need to solve the harmonic assessment. At home and abroad for the calculation of the common connection point of the power system (Point of Common Coupling, PCC) of the harmonic emission level is based on the system impedance. In this paper, the harmonic principle, cause and endangering are roughly described, method for t Harmonic separation of responsibilities of the system at the PCC and t each user is used. The method uses the venin - Norton hybrid equivalent model based on the reference impedance and Voltage vector superposition principle, refines the system and inpidual users of the contribution of PCC harmonic voltage, the quantifies harmonic percentage of responsibility of the system and each user's explicit. Accurate and rationality of this method is verified by Multisim 7 simulation.
Keywords harmonic PCC Harmonic separation Harmonic responsibility Superposition of voltage vector Norton equivalent
The venin equivalent Multisim 7
目录
1 引言 1
1．1 电力系统谐波 1
1.1.1 电力系统谐波起因 1
1.1.2 电力系统谐波危害 2
1.1.3 电力系统谐波研究现状 3
1.2 电力系统谐波治理方法 5
1.3 本文的主要内容 6
2 谐波分析 8
2.1 采用的理论 8
2.1.1 戴文南定理 8
2.1.2 诺顿定理 9
2.1.3 基尔霍夫电流定律 9
2.1.4 基尔霍夫电压定律 9
2.2 参考谐波阻抗的计算 9
2.3 等效谐波电源计算 11
2.4 本章小结 12
3 谐波责任计算 13
3.1 基于分压原理计算系统在该PCC点产生的谐波电压 13
3.2 基于分流原理计算PCC各个用户在该PCC处产生的谐波电压。 13
3.3 本章小结 15
4 软件仿真 16
4.1 Multisim 7简介 16
4.1.1 Multisim 7背景 16
4.1.2 Multisim 7特点 17
4．2等效负荷仿真模型 19
4.3 本章小结 22
结 论 23
致 谢 24
参考文献 25
1 引言 配电网公共连接点谐波评估与仿真:http://www.youerw.com/tongxin/lunwen_2627.html