并联型有源电力滤波器的电流检测和无差拍控制方法的研究

发布时间：2018-11-04 14:53

【摘要】：谐波是目前影响电能质量的主要因素，各种谐波治理手段也相继被提出，其中有源电力滤波器（Active Power Filter，APF）作为抑制谐波最为有效的装置，其关键技术包括：谐波电流的检测算法和补偿电流的跟踪控制策略。本文以并联型有源电力滤波器（Shunt Active Power Filter，SAPF）为对象，，就其两方面的关键技术进行展开研究。谐波电流的检测方面，针对传统ip iq检测法中由低通滤波器（Low Pass Filter，LPF）引起的延迟问题进行分析，结合傅立叶分解法，提出了一种改进的积分检测法，利用延时、积分环节取代传统的LPF，大大缩短了APF从投入到正常工作的运行时间；且在三相不对称系统中，只需进行简单的三角函数变换，就可以灵活地运用该方法，与传统的构造法相比，结果说明该方法可以减小了系统的延迟，具有一定的优越性。补偿电流的跟踪控制方面，舍弃了传统的跟踪型控制方法，采用预测型的无差拍控制法（Dead-Beat Control）。在数字系统中，基于三相三线制SAPF的数学模型，建立系统的状态空间方程，利用电压空间矢量脉宽调制技术（Space Vector Pulse WidthModulation，SVPWM），将对指令电流的控制转化对电压的控制，借用无差拍控制在逆变器中的应用原理，化简状态方程，再将对谐波电流的预测转化为对负载电流的预测，通过重复预测器提前一拍预测。直流侧采用简单的PI控制，选定合适的参数，实现对直流侧电容电压稳定性的控制。最后，采用Matlab仿真软件，在Simulink下搭建系统的仿真模型，确定仿真参数，对文中提出的谐波检测方法和补偿电流的控制策略进行仿真实验，并将仿真结果与传统的方法进行比较，验证文中所提方法的有效性和准确性。
[Abstract]:Harmonic is the main factor affecting power quality at present, and various harmonic control methods have been proposed one after another, among which the active power filter (Active Power Filter,APF) is the most effective device to suppress harmonics. The key technologies include harmonic current detection algorithm and compensation current tracking control strategy. In this paper, two key technologies of shunt active power filter (Shunt Active Power Filter,SAPF) are studied. In the aspect of harmonic current detection, the delay problem caused by low pass filter (Low Pass Filter,LPF) in the traditional ip iq detection method is analyzed, and an improved integral detection method is proposed by using the Fourier decomposition method. The integral link replaces the traditional LPF, and greatly shortens the running time of APF from input to normal operation. In the three-phase asymmetric system, the simple trigonometric function transformation can be used flexibly. Compared with the traditional construction method, the results show that the method can reduce the delay of the system and has some advantages. In the tracking control of compensation current, the traditional tracking control method is abandoned, and the predictive beat free control method (Dead-Beat Control).) is adopted. In the digital system, based on the mathematical model of three-phase three-wire SAPF, the state space equation of the system is established, and the control of the instruction current is transformed into the control of the voltage by using the voltage space vector pulse width modulation (Space Vector Pulse WidthModulation,SVPWM) technology. Based on the application principle of deadbeat control in inverter, the equation of state is simplified, and then the prediction of harmonic current is transformed into the prediction of load current, and a beat prediction is made ahead of time by repeated predictor. The DC side is controlled by simple PI control and appropriate parameters are selected to control the voltage stability of the DC side capacitance. Finally, the simulation model of the system is built under Simulink with Matlab software, and the simulation parameters are determined. The harmonic detection method and the control strategy of compensating current are simulated, and the simulation results are compared with the traditional methods. The validity and accuracy of the proposed method are verified.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN713.8;TM73

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