Tutor: TianMingXing

School: Lanzhou Jiaotong University

Course: Power Electronics and Power Drives

Keywords: Hybrid Active Power Filter Composite Control Harmonic Analysis

CLC: TN713.8

Type: Master's thesis

Year: 2010

Downloads: 107

Quote: 0

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With the wide application of power electronic devices in the industry, which produces a harmonic current injected into the grid, affecting the normal operation of the electrical equipment, power system harmonic control has become an important problem. This thesis grid harmonic as the research object, using the new hybrid injection the active filter HAPFIS (Hybrid Active Power Filter with Injection Structure) harmonic detection, filtering principle of HAPFIS compensation characteristics, control algorithm in detail study better HAPFIS system. First, the analysis and comparison of the currently active filter harmonic detection method. Ip-iq detection method can be applied to the power supply voltage distortion, but when applied to the grid three-phase voltage asymmetry, the positive sequence reactive component detect the presence of errors. Ip-iq method based on improved ip-iq detection method based on supply voltage filtering, and programming in MATLAB software simulation study. Secondly, the introduction of topological structure of HAPFIS. HAPFIS series resonant injection-type active filter and passive filter branch parallel mixture of common harmonic suppression by passive part compensate for reactive power, active part and passive part, the fundamental series resonant circuit at the fundamental frequency occurring at the series resonance, the impedance is very small, the inverter is only exposed to a small amount of the fundamental wave voltage, so that its capacity can be further reduced. Analysis filtering principle HAPFIS. HAPFIS the active section corresponds to a controllable harmonic impedance in series in the power grid branch into the grid when the harmonic impedance is large enough, the harmonic currents will be very small, close to zero, and play a harmonic suppression the role of the current; the same time can be suppressed to a resonance between the passive part and the grid impedance. Also studied the HAPFIS steady state compensation characteristics and inhibit the performance of the system resonance. Third, an overview of the control method of active power filter. Hybrid Injection Active filter different from the separate use of the active filter, the control method can not copy the active filter used alone, considering HAPFIS the control reference signal for this feature of the cycle amount, using a recursive integral PI control algorithm to eliminate the steady-state error of the system. Into active filter, the filtering effect of the passive filter branch has been greatly affected, recursive integral PI control algorithm based on improved control algorithm based on recursive integral PI divide control. The active inverter input, passive filter branch is not affected. Fourth, the fuzzy control the introduction of HAPFIS control algorithm, based on the divide-controlled recursive integral PI control algorithm with fuzzy control algorithm combined, constitute a blur - recursive integral PI compound control algorithm, this control algorithm fuzzy control and recursive integral PI control two control methods combine the advantages of parameters online for adjustments to address the parameter settings are not allowed to bring the error. Finally, the use of PSIM simulation software simulation analysis of the three control algorithm to verify the effectiveness of various control methods. |

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter > Active filter

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