Coordination Control Of Variable Speed Constant Frequency Doubly-Fed Wind Power Generators And Remote Control

The development and utilization of renewable energy has been paid more and more attention. As one of the cheapest and most promising green energy, wind power has gained considerable development. Also, as the most promising wind power technology currently, variable speed constant frequency technology has become the hotspot of wind power research at home and abroad, and has been in extensive use. At present, wind power generation has come into a golden age, with the construction process of wind farm greatly speeding up. With the growing increase of installed capacity of wind farm connected into grid, the relation between wind power system and grid has become closer, and the influence brought about can not be ignored any more. It is of great significance to maintain constant voltage and frequency, and to improve the stability of the system by conducting research on coordination control of wind power generators and power system.Wind farm is usually located in remote areas even at the sea, and natural condition is poor, so it is necessary to flush the remote monitoring. However, the present domestic wind farm remote monitoring systems are mainly purchased from abroad, with poor universality and compatibility. Therefore, it has become a popular research topic to develop common wind farm remote monitoring system.Firstly, the principle of variable speed constant frequency doubly-fed wind power generation and its system structure is studied. Basic characteristics of wind turbine and principle of maximal wind power capture is also discussed. After that, power relations of DFIG connected into grid are deduced and P-Q capacity limitation of unitary wind turbine is also given. Based on this, the unitary power results above are expanded to the case of wind farm connected to grid, which lays a foundation for further study on coordination control strategy for grid integration of wind farm.Secondly, key research on coordination control strategy for double-fed induction generators and power system has been conducted. Scheme for active power coordination control and reactive power optimization control are determined. Active power coordination control is based on safe and stable operation of unitary machine as well as optimal wind power conversion, while reactive power optimization control is based on voltage stability and reactive power optimization operation of the whole grid.While studying wind farm remote monitoring system, the frame diagram of wind farm remote monitoring system is firstly devised. Then combined with 11 kW wind power generation system experiment platform, the hardware structure of wind farm remote monitoring system is discussed. Besides, the overall system design is studied, including system requirements analysis, system structure, development tools and development platform.Lastly, functional design of wind farm remote monitoring system is discussed, including system database design and web application program design. Based on this, parts of system functions are realized.