Research On The Technology Of Permanent Magnet Wind Power Generation System Based On Virtual Synchronous Generation

Wind power generation system integrated rich wind energy resources,and fully played the advantage of clean and renewable energy,and realized the maximum using of renewable energy,it has the great significance to guarantee system reliability and flexibility,reduce environmental pollution,improve the efficiency of energy.At present,as one of the core technologies in the field of wind power of wind power converter technology,it still has many problems to solve.On the one hand,in order to meet the requirements of the wind power system security and reliability and researching the wind power generation system,researching the converter topology of wind power generation system and its controlled method is the emphasis and difficulty in the field of wind power technology.On the other hand,as the penetration rate of distributed power generation equipment in wind power systems increased,reducing the randomness of renewable power generation equipment and the influence of interference on the stability of large power grid of power system has important practical significance.This paper summarized the research status of wind power at home and abroad from aspect of economy,environmental protection and reliability of wind power system firstly.Then analyzed the characteristics of the basic conception of wind power generation technology and converter topologies and control strategies simply.Considering the characteristics of the traditional synchronous generator power and giving full play to the power electronic converter technology flow in advantages of fast and reliable,proposed a wind power generation model which can maintain the unity power factor operation and has the characteristic of the synchronous generator under the condition of the maximum power transfer.The results show that through the power electronic simulation of characteristics of the synchronous generator,choosing suitable converter structure and its control parameters,wind power output can be adjusted reasonable,and maximum power transmission of wind power equipment can be ensured.Stability of system and quality of wind power system can be also improved.In order to improve the output of wind turbine of wind power system,and enhance the utilization rate of wind energy,and make wind turbine system work at the optimal tip speed ratio to achieve maximum power transmission,the ultrasonic anemometer is designed,this paper analyzes the main characteristics of ultrasonic and the main performance index of the ultrasonic transducer and introduce the principle of wind measurement based on the time difference method and analyzed the design of the ultrasonic transducer transceiver circuit either,the FPGA was used to realized the control algorithm and serial communication.Finally it was tested by wind tunnel,the validity of the ultrasonic anemometer was verified,the accurate measurement of the speed can make the the wind power system operate more efficiently and reliably.To improve power quality of wind power generation equipment,and reduce effect of randomness and fluctuation of generation equipment to the power system,and realize the wind power system operation security and reliably of power system,established the control model of dual PWM converter of permanent magnet wind power generation system based on the control strategy of virtual synchronous generator under the situation of getting accurate measurement value of wind.Stable output of DC voltage was realized through the design of the three-phase PWM rectifier converter of the wind machine side,and the design of the three-phase PWM inverter of grid side realized the maximum power point tracking and the operation of unity power factor,making the wind power system work easily in status of independent or grid-connected.