电能质量调节器谐波检测与控制策略的研究

发布时间：2018-08-25 19:08

【摘要】：目前,随着各种非线性电力电子装置的广泛应用,电网中的谐波污染日益严重,电力系统电能质量受到严重挑战。有源电力滤波器作为电能质量调节器的重要内涵,在谐波治理中发挥着重要作用,研究实时、准确、高效的电力有源滤波器具有重要的理论和工程实际意义。本文研究了电能质量调节器谐波抑制系统,在传统定步长自适应谐波检测算法无法满足动态响应速度与稳态精度兼容基础上,提出了改进的变步长自适应谐波检测算法,它利用滑动积分器提取真正的跟踪误差；为了保证既有快速的收敛特性,又有较小的稳态误差,采用了带有自调因子的模糊调整器。在谐波电流补偿控制算法上,本文所提出的SVPWM算法克服了传统SVPWM算法输出毛刺较大,IGBT工作频率较高等缺点,能够限制窄脉冲的输出,使输出毛刺减小,降低IGBT的开关频率,且具有提高直流侧电压利用率等优点。为验证有源滤波器样机的补偿性能,又不影响电网的正常工作,本文设计了与电网完全隔离的谐波源。谐波电源是在基波正弦函数的基础上叠加各次谐波函数,在负载回路产生谐波电流模拟电网作为补偿对象。
[Abstract]:At present, with the wide application of various nonlinear power electronic devices, harmonic pollution in the power network is becoming more and more serious, and the power quality of power system is seriously challenged. As an important connotation of power quality regulator, active power filter (APF) plays an important role in harmonic control. It is of great theoretical and practical significance to study real-time, accurate and efficient APF. The harmonic suppression system of power quality regulator is studied in this paper. An improved adaptive harmonic detection algorithm with variable step size is proposed on the basis that the traditional adaptive harmonic detection algorithm with fixed step size can not meet the compatibility of dynamic response speed and steady-state accuracy. It uses a sliding integrator to extract real tracking errors, and in order to ensure both fast convergence and small steady-state errors, a fuzzy regulator with self-tuning factors is used. In the harmonic current compensation control algorithm, the SVPWM algorithm proposed in this paper overcomes the shortcomings of the traditional SVPWM algorithm, such as high output burr and high working frequency. It can limit the output of narrow pulse, reduce the output burr and reduce the switching frequency of IGBT. The utility model has the advantages of improving the utilization ratio of DC side voltage and so on. In order to verify the compensation performance of the APF prototype without affecting the normal operation of the power grid, a harmonic source completely isolated from the power grid is designed in this paper. The harmonic power supply is based on the fundamental sinusoidal function, and the harmonic function is superimposed. The harmonic current generated in the load loop is simulated as the compensation object.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761

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