基于DSP的靜止無(wú)功發(fā)生器控制系統(tǒng)研究
[Abstract]:With the expansion of power system construction in our country, the reactive power required by all kinds of power equipment is also increasing, which has a great impact on the power quality of power system. In order to improve the power quality of power grid, reactive power compensation is an important and effective measure, and it is also an important part of smart grid construction. As an advanced reactive power compensation device, static Var Generator (SVG) can quickly and accurately track and compensate reactive power, suppress voltage fluctuation and flicker. In this paper, the background and research significance of reactive power compensation and the development process of reactive power compensator are described, and the development trend of SVG in the future is analyzed. Then, the basic structure, working principle and working process of SVG are studied. According to the theory of instantaneous reactive power, the mathematical model of SVG in dq coordinate system is established. Secondly, in view of the strong coupling and nonlinear characteristics of SVG, a novel current loop feedforward decoupling control without inductance and a voltage loop sliding mode variable structure control are proposed. The simulation and verification of the control strategy are carried out in MATLAB/simulink environment. The simulation results show that the control system with the new double closed loop control strategy can track and compensate reactive power quickly, and is not affected by the change of inductance parameters, so it is robust to the sudden change of load. At the same time, the capacitor voltage of DC side can rise rapidly and maintain near the reference voltage. Thirdly, in order to realize the effective compensation of SVG to power system reactive power, this paper uses DSP TMS320F2812 as the main control chip to design the hardware circuit of each function module of SVG control system, including signal acquisition and conditioning circuit. Zero-crossing detection circuit IGBT drive amplifier circuit and drive protection circuit. In addition, the software of each function module of the control system is designed in CCS environment, including system initialization module, data processing module, PWM trigger pulse generation module and liquid crystal display module. Finally, the hardware circuit and software program designed in this paper are used to complete the experiment of the control system. The feasibility of the designed control system is verified, and the control effect is good.
【學(xué)位授予單位】:江蘇科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TM761.12
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