虚拟电阻型有源电力滤波器的研究
发布时间：2018-12-20 13:35
【摘要】：公用电网的谐波污染日益严重,电力用户对电能质量的要求日益提高。有源电力滤波器因其优良性能,被广泛应用于谐波治理领域。传统的基于电流检测的有源电力滤波器通常只能对本地负荷进行就近补偿,无法吸收电网中其他非线性负荷注入的谐波电流。本文的主要目的是研究一种虚拟电阻型有源电力滤波器,不必检测负载电流,即可从电网吸收谐波电流;基于虚拟电阻型APF,提出一种新的谐波治理策略,可方便地界定用户的治理或污染行为,并给以适当奖惩,从而可充分调动用户治理谐波的积极性,达到改善电能质量的目的。本文分析了基于瞬时无功功率理论的特定次数谐波检测方法和基于FFT的谐波检测方法;通过建立有源电力滤波器的数学模型,对电流环和电压环的PI控制参数进行设计。本文针对传统有源电力滤波器在多谐波源区域中治理谐波的局限性,提出一种基于电压检测的虚拟电阻型有源电力滤波器,这种APF仅需检测系统各次谐波电压,即可以有源谐波电阻的形式消纳系统中的谐波电流,突破传统APF的局限性。在虚拟电阻型APF的基础上,本文提出一种新的谐波治理策略,虚拟电阻型APF通过调节各次等效谐波电阻阻值,使其吸收的各次谐波功率均达到最大值;主张以谐波功率的排放或吸收界定用户污染者或治理者的角色,给予用户相应的惩罚或奖励,从而补偿用户吸收系统谐波电流而增加的成本,充分调动用户主动治理谐波的积极性。在深入分析研究不同情况下最佳阻值取值条件的基础上,本文提出一种基于一维搜索的最佳阻值自动调节方法,并针对系统电阻远小于系统电抗的情况,提出一种基于系统阻抗计算的最佳阻值调节方法。仿真结果表明,虚拟电阻型有源电力滤波器在最佳阻值自动调节机制下,可快速调节各次等效谐波电阻达到最佳阻值,并且对系统谐波电压、谐波电流均有显著的治理效果。基于TMS320F2812 DSP设计虚拟电阻型有源电力滤波器实验系统,从主电路、控制电路、软件程序等方面详细介绍了其设计方法。实验结果进一步证明虚拟电阻型有源电力滤波器在谐波治理中的作用。
[Abstract]:The harmonic pollution of public power network is becoming more and more serious. Active power filter (APF) is widely used in harmonic control field because of its excellent performance. The traditional active power filter based on current detection can only compensate the local load nearby and can not absorb the harmonic current injected by other nonlinear loads in the power network. The main purpose of this paper is to study a virtual resistive active power filter, which can absorb harmonic current from power network without detecting load current. Based on virtual resistive APF, a new harmonic control strategy is proposed, which can conveniently define the user's treatment or pollution behavior, and give appropriate rewards and punishments, thus fully arousing the enthusiasm of users to control harmonics and achieving the purpose of improving power quality. In this paper, the harmonic detection method based on instantaneous reactive power theory and the harmonic detection method based on FFT are analyzed, and the PI control parameters of current loop and voltage loop are designed by establishing the mathematical model of active power filter. In this paper, a virtual resistive active power filter based on voltage detection is proposed to overcome the limitation of the traditional active power filter in the multi-harmonic source region. This kind of APF only needs to detect the harmonic voltage of the system. That is, the active harmonic resistor can absorb the harmonic current in the system and break through the limitation of traditional APF. On the basis of virtual resistive APF, a new harmonic control strategy is proposed in this paper. Virtual resistor APF can achieve the maximum harmonic power by adjusting the equivalent harmonic resistance of each order. It is advocated that the role of user polluter or controller should be defined by the emission or absorption of harmonic power, and the corresponding punishment or reward should be given to the user, thereby compensating the user for the increased cost of absorbing harmonic current of the system. Fully mobilize the enthusiasm of users to actively manage harmonics. On the basis of in-depth analysis and study of the optimal resistance value conditions under different conditions, this paper presents an automatic control method of optimal resistance value based on one-dimensional search, and aims at the situation that the system resistance is far less than the system reactance. A method of optimal resistance regulation based on system impedance calculation is proposed. The simulation results show that the virtual resistive active power filter can quickly adjust the equivalent harmonic resistance of each order to achieve the optimal resistance under the optimal resistance automatic regulation mechanism, and the harmonic voltage and harmonic current of the system can be treated significantly. An experimental system of virtual resistive active power filter based on TMS320F2812 DSP is designed. The design method of virtual resistive active power filter is introduced in detail from main circuit, control circuit, software program and so on. The experimental results further prove the function of virtual resistive active power filter in harmonic control.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8
本文编号：2388068
[Abstract]:The harmonic pollution of public power network is becoming more and more serious. Active power filter (APF) is widely used in harmonic control field because of its excellent performance. The traditional active power filter based on current detection can only compensate the local load nearby and can not absorb the harmonic current injected by other nonlinear loads in the power network. The main purpose of this paper is to study a virtual resistive active power filter, which can absorb harmonic current from power network without detecting load current. Based on virtual resistive APF, a new harmonic control strategy is proposed, which can conveniently define the user's treatment or pollution behavior, and give appropriate rewards and punishments, thus fully arousing the enthusiasm of users to control harmonics and achieving the purpose of improving power quality. In this paper, the harmonic detection method based on instantaneous reactive power theory and the harmonic detection method based on FFT are analyzed, and the PI control parameters of current loop and voltage loop are designed by establishing the mathematical model of active power filter. In this paper, a virtual resistive active power filter based on voltage detection is proposed to overcome the limitation of the traditional active power filter in the multi-harmonic source region. This kind of APF only needs to detect the harmonic voltage of the system. That is, the active harmonic resistor can absorb the harmonic current in the system and break through the limitation of traditional APF. On the basis of virtual resistive APF, a new harmonic control strategy is proposed in this paper. Virtual resistor APF can achieve the maximum harmonic power by adjusting the equivalent harmonic resistance of each order. It is advocated that the role of user polluter or controller should be defined by the emission or absorption of harmonic power, and the corresponding punishment or reward should be given to the user, thereby compensating the user for the increased cost of absorbing harmonic current of the system. Fully mobilize the enthusiasm of users to actively manage harmonics. On the basis of in-depth analysis and study of the optimal resistance value conditions under different conditions, this paper presents an automatic control method of optimal resistance value based on one-dimensional search, and aims at the situation that the system resistance is far less than the system reactance. A method of optimal resistance regulation based on system impedance calculation is proposed. The simulation results show that the virtual resistive active power filter can quickly adjust the equivalent harmonic resistance of each order to achieve the optimal resistance under the optimal resistance automatic regulation mechanism, and the harmonic voltage and harmonic current of the system can be treated significantly. An experimental system of virtual resistive active power filter based on TMS320F2812 DSP is designed. The design method of virtual resistive active power filter is introduced in detail from main circuit, control circuit, software program and so on. The experimental results further prove the function of virtual resistive active power filter in harmonic control.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8
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