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Study of a Waveform Control Technique For Inverter Based On Realtime Harmonic Analysis

Author: ChouZhiLing
Tutor: XiongRui
School: Huazhong University of Science and Technology
Course: Power Electronics and Power Drives
Keywords: Inverter Harmonic Analysis FFT algorithm Instantaneous feedback Digital PD controller Artificial Neural Networks
CLC: TM464
Type: Master's thesis
Year: 2004
Downloads: 305
Quote: 3
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Abstract


In the the important electricity occasion does not allow a power interruption, the use of a large number of UPS (uninterruptible power supply) system. CVCF-PWM inverter is the core component of the UPS system, it has a high quality output voltage waveform. In order to make it even in the case of a nonlinear load is still nearly sinusoidal output voltage, the development of a wide variety of waveform control technology. The research content of this article is based on the harmonic real-time analysis of the PWM inverter waveform control technology. The main work: the load current handling perturbation can be measured, there is established a linear mathematical model of the PWM inverter. The mathematical model of the transfer function of the form and the form of the equation of state, also pointed out that the two forms of the model can be chosen depending on the control scheme. In order to suppress the disturbances no difference, given the block diagram of the control system, and proved that the structure can be no difference in suppression of disturbances. In order to compensate for the disturbance, using the FFT algorithm for harmonic analysis of disturbances. FFT algorithm has been greatly improved the efficiency of the DFT calculation, but the amount of computation for real-time control is still too big, this paper presents a simplified type of FFT algorithm, greatly reducing the amount of computation. Harmonic analysis of disturbances to be precision spectral analysis is bound to the original signal the windowing processing, which impact. This paper analyzes this impact, pointed out that the analysis window length and sampling frequency to meet certain requirements, you can get high-precision harmonic analysis. The dynamic characteristics of the ring-opening of the inverter is very poor, with a severe oscillation tendencies, it is necessary to use the instantaneous feedback to correct. The instantaneous value of the feedback system performance in-depth analysis, pointed out that the instantaneous value feedback not only can improve system dynamic performance, and also have some help on the steady-state accuracy improve. The article also discusses the system uses digital PD controller design method, summed up a set of effective design methods. FFT results obtained is the plural form, and can not be used directly, you need to convert it into a direct form of amplitude and initial phase. Here, the angle of the strike is the most critical, their accuracy directly affects the system performance. This paper first introduces a bipartite table method of solving algorithm, the algorithm extremely high accuracy, but the large amount of calculation. In order to improve the efficiency of the algorithm, the proposed algorithm based on neural network. This algorithm has a good precision, and greatly reduces the amount of calculation and to reduce the complexity of programming. Finally, the control scheme adopted experimental verification. The entire control algorithm to achieve an F240 DSP chip. Experimental results show that the control scheme used in this paper can not only get low THD output voltage in the steady state, a better dynamic performance and load mutation.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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