潮流能并網(wǎng)逆變器控制技術(shù)研究
[Abstract]:With the development of new energy, the exploitation and utilization of ocean tidal energy, which is one of the most popular branches, has been paid more and more attention. With the deepening of the research and the expansion of the scale of development, the technology of grid-connected power flow has been developed rapidly. In this context, on the basis of a large number of references, the grid-connected inverter technology in power flow power generation system is studied in this paper. Compared with several common inverter topology forms, combined with the actual situation and the characteristics of power flow generation, select the topology suitable for this paper, and establish the state and circuit switch models under abc static coordinate system and dq rotation coordinate system. It provides the mathematical theory basis for the later research of grid-connected control technology of inverter. In the power generation system, the structure selection of the power conversion device will directly affect the performance and efficiency of the system. In this paper, a two-stage power flow topology with variable speed and constant frequency direct-drive is used in a double PWM converter, which has the characteristics of high power factor on the grid side and high power factor on the machine side, and low harmonic current in the injected power network. The machine side rectifier uses a variable step size MPPT algorithm, which has the characteristics of fast tracking of the change of flow velocity and difficulty of causing the maximum power point oscillation. The grid-side inverter adopts the direct current control mode with voltage and current double loop with grid voltage feedforward, which has the characteristics of fast system regulation, simple control and high power factor. In this paper, the voltage outer loop and the current inner loop of the inverter are designed. The current inner loop is a typical second order system, while the voltage outer loop is a typical II type system. The function of grid voltage feedforward is analyzed, and a SPLL method is applied to ensure that the phase of grid-connected current is the same as that of grid voltage, so that the inverter can run with high power factor. Based on the theoretical study of the control strategy, the paper designs the prototype of the control strategy, including DC filter capacitance, three-phase bridge arm device selection. The design of AC side filter, the system control circuit with ARM as the core and the design of IGBT driver. The simulation model of inverter is built by using MATLAB/Simulink platform, and the software phase-locked loop and grid-connected control strategy are simulated, which provides feasibility verification for the design and debugging of the actual experimental prototype. Finally, the test prototype is debugged to verify the correctness and feasibility of the proposed control strategy.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM464
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