电力系统谐波和负序信号检测算法研究

发布时间：2018-10-11 13:40

【摘要】：随着现代工业的快速发展，电力系统中非线性负载逐渐增加，谐波问题越来越复杂。如今，谐波污染已成为影响电力系统电能传输与分配的重要因素，其所带来的问题主要包括继电保护和自动装置的误动作、谐波损耗、绝缘老化和通讯干扰等。由于谐波可以引起上述各种危害，所以减少或消除谐波已成为电力系统中亟待解决的问题。而谐波检测是谐波抑制的前提和基础，因此谐波检测在提高电能质量方面具有十分重要的意义。针对电力系统中的谐波检测问题，本文深入研究了二阶广义积分器-延时信号消去算法和级联延时信号消去算法。二阶广义积分器-延时信号消去算法将SOGI滤波器、DSC方法和LPN-PLL相结合，适用于畸变和不对称的三相系统，可以提取出基波正序分量。利用Matlab软件对该检测算法进行了仿真分析。针对二阶广义积分器-延时信号消去算法只能检测出基波正序分量，而不能检测出任意次谐波的问题，，在DSC的基础上应用了级联延时信号消去算法。该算法可以检测出任意次谐波的幅值和相角，并利用Matlab软件进行了仿真分析。本文设计了基于dSPACE实时仿真系统的实验平台来验证上述两种算法的有效性。该实验平台由两部分组成，分别是dSPACE的单板系统DS1104和谐波源及非对称三相系统实验平台。谐波源及非对称三相系统实验平台是基于FPGA进行开发设计的，用于实现三相可编程信号源及与dSPACE系统之间的通讯。本文针对电网中可能发生的电压跌落、三相不平衡以及谐波畸变故障设计了实验案例，实验结果表明这两种算法均可以快速、准确地检测出信号中的谐波。
[Abstract]:With the rapid development of modern industry, the nonlinear load in power system increases gradually, and the harmonic problem becomes more and more complex. Nowadays, harmonic pollution has become an important factor affecting the transmission and distribution of electric energy in power system. The main problems brought about by harmonic pollution include the maloperation of relay protection and automatic device, harmonic loss, insulation aging and communication interference. Since harmonics can cause the above kinds of hazards, reducing or eliminating harmonics has become an urgent problem in power system. Harmonic detection is the premise and foundation of harmonic suppression, so harmonic detection plays an important role in improving power quality. Aiming at harmonic detection in power system, the second order generalized integrator-delay signal elimination algorithm and cascade delay signal elimination algorithm are studied in this paper. The second order generalized integrator-delay signal elimination algorithm combines SOGI filter, DSC method and LPN-PLL. It is suitable for three phase systems with distortion and asymmetry, and can extract the positive sequence component of fundamental wave. The Matlab software is used to simulate the detection algorithm. In view of the problem that the second-order generalized integrator-delay signal elimination algorithm can only detect the positive sequence component of the fundamental wave but not any order harmonics, the cascaded delay signal elimination algorithm is applied on the basis of DSC. The algorithm can detect the amplitude and phase angle of any order harmonics, and the simulation analysis is carried out by Matlab software. An experimental platform based on dSPACE real-time simulation system is designed to verify the effectiveness of these two algorithms. The experimental platform consists of two parts: DS1104 harmonic wave source of dSPACE single board system and asymmetric three-phase system. The experimental platform of harmonic source and asymmetric three-phase system is developed based on FPGA, which is used to realize the communication between three-phase programmable signal source and dSPACE system. In this paper, an experimental case is designed for the possible voltage sag, three-phase imbalance and harmonic distortion faults in the power network. The experimental results show that the two algorithms can detect harmonics in the signal quickly and accurately.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935

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