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摘要：基于无功功率理论的谐波检测算法，经过电力系统网络侧获得的三相电源电压和电流值,跟据瞬时无功功率理论将三相坐标转变为和电网基波频率同步旋转坐标，接着算出其对应的瞬时功率数值，跟低通滤波器求得瞬时功率的直流有功分量和直流无功分量再经过clark反变换得出三相静止坐标平面下的基波分量，然后与三相电流原始值做差就可得出谐波分量。这次设计分析讨论鉴于三相电路的瞬时无功功率理论谐波电流检测的ip-iq算法, 这种办法，需用到和电网A相电压ea等相位的正弦信号 和对应的余弦 ，它们由一个PLL和一个正、余弦信号发生电路得到。跟据据理论可以计算出ip、iq，经过低通滤波器过滤得出ip、iq的直流分量 、 ，通过直流量算出基波电流与原始电流做差，就能得基波电流，用PSCAD进行仿真，仿真结果显示，ip-iq法在电压畸变的情况下也能准确检测谐波。41576
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毕业论文关键词：电压畸变，谐波电流检测，谐波/仿真软件。
Design and Simulation of harmonic detection algorithm based on ip-iq
Abstract:Power theory of harmonic detection algorithm based on unconstrained, obtained by the power system network side of the three-phase power supply voltage and current value, with according to the instantaneous reactive power theory for three-phase coordinate transformation and fundamental frequency of grid synchronous rotating coordinate, then calculate the corresponding instantaneous power of numerical, with low pass filter obtained instantaneous power DC active component and DC reactive component again after Clark inverse transform obtained under three-phase static coordinate plane fundamental component and three-phase current and original value can be obtained harmonic component. The design analysis and discussion with no power theory of harmonic current detection of IP IQ algorithm in three-phase circuit instantaneous. This way, the need to use and a power grid phase voltage EA and phase of sinusoidal signal and the corresponding cosine, they consist of a PLL and a positive and cosine signal generating circuit to. According to the calculated IP, IQ could be according to the theory, after low-pass filters that IP, IQ of DC component, and through direct flow to calculate the fundamental current and original current difference would be fundamental current, and simulated by PSCAD, simulation results show that, IP IQ method under the condition of voltage distortion can also accurately detect the harmonic.
Keywords: Voltage distortion, harmonic current detection, harmonic / simulation software.
目录
摘要 2
1 .绪论 5
1.1 本课题的背景 5
1.2 谐波的基本概念及谐波源 5
1.3 谐波的危害 8
1.4 谐波抑制 9
1.4.1 LC滤波器的基本原理和分类 10
1.4.2 APF基本原理和简单分类 10
1.5 课题意义 12
1.6 研究内容 12
2 瞬时无功功率理论和应用 14
2.1 三相电路瞬时无功功率理论 14
2.2 谐波和无功功率的实时检测 15
2.2.1 谐波检测 16
2.2.2 ip-iq(dq0)谐波检测 19
3 基于ip-iq谐波检测算法设计 23
3.1 PSCAD/EMTDC仿真软件 23
3.2 旋转坐标变换 23
3.3 锁相环（PLL） 24
3.4 谐波检测 25
4 实验仿真验证 26
4.1 基于PSCAD的仿真实验 26
4.1.1 仿真环境的建立 26
4.1.2 硬件要求 27
4.2 仿真模型原理 27
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