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微电网谐波治理方法的研究

发布时间:2018-05-19 02:27

  本文选题:微电网 + 谐波分析 ; 参考:《沈阳工业大学》2017年硕士论文


【摘要】:谐波是电能质量问题的重要内容之一。在微电网中,各种类型的微电源、大量的变流装置以及非线性负载都会造成谐波污染。为了提高供电质量,本文从分析微电网内谐波产生的机理入手,从以下三个方面对谐波治理方法进行研究:(1)对APF的控制方法进行研究。对于需要投入专门滤波装置的场合,提出了关于APF无差拍预测直接功率控制(Direct Power Control,DPC)的控制方法。按照无差拍预测模型,在每个采样周期实现对下一周期预测指令参考值的实时跟踪。通过SVPWM方法产生APF控制信号,保证了开关频率的固定。为了消除跟踪误差,对该控制方法进行改进,加入了基于内模原理的积分环节进行反馈校正。在Matlab/Simulink软件平台搭建模型,对此方法进行了仿真对比分析。结果表明,该控制方法能够提高APF动态跟踪、抑制谐波的能力。(2)为了提高微电网运行经济性,减少专门滤波设备的投入,利用储能装置和APF主电路结构相同的特点,提出了一种微电网在孤岛状态下储能系统的综合控制方法。通过叠加控制信号控制储能装置同时进行系统调频和谐波治理。利用Matlab/Simulink软件对该综合控制方法进行了仿真分析。仿真结果表明,该综合控制方法能够达到预期效果。(3)在微电网多谐波源的背景下,为了降低对滤波装置容量的要求,对谐波协同治理的可能性进行初步探索。从电流角度分析协同治理的机理,得出对于工作在恒功率模式下的谐波源,谐波电流的相角随其功率的变化而变化。通过Matlab/Simulink仿真和实验测试分别进行观察验证。结果表明,多个谐波源工作时,一定范围内的功率变化,特定频率的谐波电流之间存在相互消减的现象。本文提出上述三种谐波治理方法,经济性能不同,控制的复杂性也不相同。三者间形成互补,可为微电网规划建设阶段的谐波治理方案提供参考。
[Abstract]:Harmonic is one of the important contents of power quality problem. In microgrid, various types of micro-power supply, a large number of converters and nonlinear loads will cause harmonic pollution. In order to improve the quality of power supply, this paper begins with the analysis of the mechanism of harmonic generation in microgrid, and studies the control method of APF from the following three aspects: 1). For the case where special filter device is needed, a direct Power control direct power control method for APF deadbeat prediction direct power control is proposed. According to the deadbeat prediction model, real-time tracking of the reference values of prediction instructions for the next cycle is realized in each sampling period. The APF control signal is generated by SVPWM method, and the switching frequency is fixed. In order to eliminate the tracking error, the control method is improved and feedback correction based on the internal model principle is added. The model is built on the Matlab/Simulink software platform, and the method is simulated and analyzed. The results show that the control method can improve the dynamic tracking of APF and the ability of harmonic suppression. In order to improve the operation economy of microgrid and reduce the input of special filter equipment, the energy storage device and the main circuit of APF have the same structure. A comprehensive control method for energy storage system of microgrid in isolated island state is presented. The energy storage device is controlled by superposition control signal and the frequency modulation and harmonic control of the system are carried out simultaneously. The integrated control method is simulated and analyzed by Matlab/Simulink software. The simulation results show that the integrated control method can achieve the desired effect. Under the background of multi-harmonic sources in microgrid, the possibility of harmonics co-control is preliminarily explored in order to reduce the requirement of filter capacity. The mechanism of cooperative treatment is analyzed from the angle of current. It is concluded that the phase angle of harmonic current varies with the change of power for harmonic source working in constant power mode. Matlab/Simulink simulation and experimental test were used to observe and verify. The results show that when multiple harmonic sources are working, the power varies in a certain range, and the harmonic currents at specific frequencies decrease each other. In this paper, the above three harmonic control methods are presented, the economic performance is different, and the control complexity is also different. They complement each other and can provide a reference for the harmonic control scheme in the planning and construction phase of microgrid.
【学位授予单位】:沈阳工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM727;TM761

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