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Research on Control Strategies of Converter in Direct-Driven Wind Generation System

Author: MiaoZuo
Tutor: ZhangWeiXing
School: Shandong University
Course: Power Electronics and Power Drives
Keywords: Direct-drive wind power system PWM converter Permanent magnet synchronous motors PSCAD / EMTDC
CLC: TM315
Type: Master's thesis
Year: 2011
Downloads: 220
Quote: 0
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Abstract


At present, the energy crisis and environmental degradation worldwide, has become a major problem restricting the development of human society, human development and utilization of renewable clean energy has become a broad consensus. Wind power as a large-scale commercial development of new renewable clean energy, attaches great importance to the world its own advantages and unprecedented development. Direct drive wind turbine due to high energy conversion efficiency and net power control flexibility, safety and reliability and many other advantages, to become one of the important research direction of the wind power technology following the double-fed wind turbine after. The development and utilization of wind resources in China is extremely rich, and has broad prospects for development, but in the mainstream megawatt direct drive wind power technology is still in a relatively backward stage, there is a wide gap between the current level of international development. Therefore, the the study direct drive wind turbine with full power grid inverter control strategy has important theoretical and practical significance, this article is that around this study. First analyzed and discussed the current situation of the development of wind power at home and abroad, the course of the development of the global wind power technology, based on analysis of the development of domestic and foreign direct drive wind power generation system. Secondly, around direct-drive wind power system network side converter modeling and control research in the mathematical model based on the network side converter voltage oriented control strategy, given the network side of the system parameters design. Third, around the back-to-back double PWM converter topology based motor side converter control technology to conduct research on the basis of analysis of the mathematical model of permanent magnet synchronous motors and wind turbine wind energy capture principle to zero d-axis current control cases of permanent magnet synchronous motor based on rotor field oriented vector control strategy. Comprehensive analysis on the basis of the network side and machine side converter control system, the establishment of a direct-drive wind power system control model, and the machine side of the system design parameters, permanent magnet direct drive wind power system low voltage operating characteristics. Analysis grid fault conditions, control strategies, and run the LVRT features and fault STATCOM mode works. PSCAD / EMTDC simulation environment to build the back-to-back PWM converter topology based on the full power 1.5MW direct-drive wind turbine simulation model, simulate and verify the stability of the above analysis of the machine side and network-side converter control strategy state and dynamic performance, the simulation results also show that the back-to-back full power converter device with good isolation, the network side of the fault on the machine side almost no effect. Grid voltage drop, the network side converter work in STATCOM mode, to the grid to provide the necessary reactive support to help the system through the low voltage region, indicating that the low voltage direct drive wind power generation system has better operational capabilities. Finally, a critical part of the hardware and software design, direct drive wind power generation control system to provide a basis for future experimental validation in laboratory platform.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Wind turbines
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