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并联混合型有源电力滤波技术研究
【作者】 张展；
【导师】 郑征；
【作者基本信息】 河南理工大学 ， 控制理论与控制工程， 2009， 硕士
【摘要】 随着电力电子技术的发展,非线性器件在电力系统中得到越来越广泛的应用,同时也给电网注入了大量的谐波。谐波污染会给电力系统的运行带来功率因数低、损耗大,严重时甚至会导致系统瘫痪等一系列问题。运用有源电力滤波技术动态补偿电网谐波,是解决这些问题,提高电能质量综合治理最有效的手段。然而有源电力滤波器存在容量受限、不能准确检测谐波电流以及谐波电流动态补偿效果差等问题。本课题仅就该技术相关方面展开研究。本课题在分析有源电力滤波器工作机理的基础上,针对有源电力滤波器(Active Power Filter简称APF)容量受限问题,提出一种改进型的并联混合型APF,其关键技术在于谐波与无功电流检测和补偿电流控制。实时、准确地检测出电网中瞬态变化的谐波或谐波与无功混合的电流是有源电力滤波器进行精确补偿的前提,本文采用检测网侧与负载侧谐波电流的复合控制方式,在比较p ? q、i p ?iq检测电流方法后,选用了基于瞬时无功功率的i p ? iq谐波电流检测法。在控制方面,提出了一种基于电压空间矢量预测电流的控制策略,该策略使系统能够提高有源电力滤波器的电流响应速度,降低了功率损耗,是一种优化的电流控制方案。最后,利用MATLAB/SIMULINK对有源电力滤波系统进行了仿真并搭建了部分实验电路。仿真和实验结果表明,该系统能够提高有源电力滤波器的电流响应速度,增强了谐波抑制性能。因此,该论文的研究工作对有源电力有源滤波器技术的研究具有一定的参考价值。
【Abstract】 With the development of power electronics technology, application of non-line devices is more and more widespread as well as lots of harmonics are injected to power system. Many problems are caused by harmonic pollution, such as lower power factor and bigger wastage; even power system will be paralytic. In order to solve the above problems, the most effective strategy of improving and governing electric quality is adopts the APF that can compensated harmonic dynamic. However, APF still exist some deficiencies which are limited capability, inaccurate harmonic currents and lower compensated effects dynamicly. Thus, the subject investigated is harmonic compensation of APF technology.Base on APF operating principle, a novel parallel HAPF is proposed in this paper against limited capability , which key technologies are detection of harmonics and reactive currents as well as the control of compensated currents. Precondition of accurate compensation is real-time and correct detection of instantaneous harmonics or harmonics and reactive power current in grid.Compared with p-q and i p ? iq harmonic current detection method, the instantaneous reactive power i p ? iq method is adopted in this paper. A predicted current control strategy based on the space voltage vector is proposed in system control, which is a optimal current control strategy due to improve the current dynamic and reduce power costs.Ultimately, the APF system is simulated by Matlab/Simulink and part circuits are designed. The simulation and test results verified that the proposed system improved current dynamic and harmonic suppression capability. So the research of APF in this paper has a great asset to APF technology.