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The Research on Harmonic Current Analysis and Processing Method of the Fourth District Power System of Changgang Company

Author: HuangHuiQun
Tutor: LvHouYu；LiuYing
School: Chongqing University
Course: Electrical Engineering
Keywords: Harmonic compensation Active Power Filter Digital Signal Processor
CLC: TM711
Type: Master's thesis
Year: 2005
Downloads: 122
Quote: 0
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Abstract


Load to produce a large number of high-order harmonic nonlinear harmonic source of electric arc furnaces, rolling machinery, high-power rectifier equipment, not only caused serious power grid harmonic pollution, but also a threat to the safe operation of the load and power supply systems, harmonic The compensation study more and more attention by everyone. Early harmonic compensation using passive filters (LC filters), but because of the inherent defects of the design principles and filtering methods can not achieve perfection, random governance purposes, the active filter can overcome the passive filter lack capacity little. With the emergence of high-power electronic devices, active power filter implementation possible. Calculated the compensation signal detection system current is a prerequisite for active power filter. Fully analyzed and compared on the basis of a variety of active power filter LC filter mix and select the mix of Shunt Active Power Filter with LC filter. And using digital signal processor (DSP), from the power supply signal acquisition analysis of harmonic compensation signal, and this signal is converted into an analog signal output, as a control signal for the active power filter, the active power filter may . The the harmonic compensation signal hardware circuit using DSP devices TMS320C5410, composed to simulate interface circuit TLC320AD50C of signal conditioning circuitry. The algorithm for the difference between the total signal fundamental and DC component is obtained as compensation signal triangle based on Fourier series. TMS320C5410 internal analog integrated phase-locked loop to reduce the frequency of the alternating current changes on the measurement accuracy of the input signals in a wide frequency range change has little effect on the measurement accuracy; TLC320AD50C internal integrated 16-bit ADC and DAC channels, the device while still in the DAC before has an inner interpolation filter can ensure that the output signal of smoothing, and in the rear of the ADC has a decimation filter in order to improve the SNR of the input signal. On the 50Hz frequency signal sampling in one cycle (20ms) within 64 points, TMS320C5410 phase locked loop frequency is 100MHz, CCS (DSP integrated development environment) Fourier trigonometric series compensation signal is obtained roughly instruction cycle The number of 875 500, and the time is 8.8ms, fully meet to complete the implementation of the compensation signal in a cycle of a power frequency (50Hz). Developed the the CCS algorithm program development, debugging, download, and simulation and the actual running board computer and experimental development system. Completed to verify the correctness of the results of study on the realization of the compensation signal of the actual waveform, the waveform test. Time and the accuracy of the results meet the power system harmonic compensation requirements can be compensated with the the harmonic compensation signal of the previous cycle in every cycle, can be used for the power supply system harmonic compensation.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Network analysis,power system analysis
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