并聯(lián)型有源電力濾波器檢測(cè)與控制系統(tǒng)研究
[Abstract]:With the rapid development of power electronics technology and the wide application of a large number of power electronic devices in production and daily life, the harmonic produced by various electrical equipment makes the power network face great harm. As an advanced power electronic device, active power filter can not only dynamically suppress harmonics, but also compensate reactive power, which can solve the problem of harmonic pollution. In this paper, the detection and control system of shunt active power filter is designed. The main research contents are as follows: (1) the basic principle of active power filter is analyzed and the mathematical model of active power filter is established according to the equivalent circuit connected with power network. Combined with mathematical model and related theoretical analysis, the selection rules of DC bus voltage, capacitance and inductance are determined. (2) A real-time detection algorithm based on instantaneous reactive power theory is studied. The p-q and ip-iq detection algorithm models are established by Matlab / Simulink. The simulation results show that the ip-iq detection algorithm has better detection effect under the condition of no voltage distortion and no distortion. Aiming at the design of low-pass filter in detection link, the influence of order and cutoff frequency on detection accuracy and tracking speed is analyzed by simulation, and the cutoff frequency and order of low-pass filter are determined. On this basis, a digital low-pass filter with both detection accuracy and tracking speed is designed. (3) the hysteresis current control algorithm based on space vector is studied, and the active power filter model is built by using Matlab / Simulink. The simulation results are compared with the traditional current tracking control algorithm. The simulation results show that the hysteresis current control algorithm based on space vector has better compensation effect under steady load transient load and voltage distortion. The DC voltage Pi control is studied, and the simulation results show that the capacitance voltage can be stabilized at the reference value after adding Pi control link. (4) the detection and control system of shunt active power filter based on DSP is designed. The hardware includes: sampling and conditioning of grid voltage load current compensation current DC side voltage isolation acquisition synchronous sampling signal acquisition anti-aliasing low-pass filter power module driver and fault output design; The software includes the design of AD sampling program for power system frequency calculation and the realization of ip-iq detection algorithm and hysteresis current control algorithm based on space vector. Based on the designed software and hardware, an experimental platform is built to verify the effectiveness of the detection and control algorithm. The experimental results show that the detection and control system designed in this paper can suppress harmonics effectively and lay a foundation for the practical application of active power filter.
【學(xué)位授予單位】:中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TM761
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