Study On SVG Compensation Control Strategy Of Qingfeng 500KV Substation Of Wind Farm Group

In this paper,according to the reactive power compensation technology requirements of Qingdong Wind Power Base of State Grid Mengdong Electric Power Co.,Ltd.,wind farm reactive power compensation technology method is used to determine the reactive power compensation capacity of the relevant wind farm substation and the control strategy of reactive power compensation device to solve the problem.The problem of efficient operation of wind farms.The Qingfeng 500 kV substation is located in Kailuo County,Tongliao City,Inner Mongolia Autonomous Region.It belongs to the wind power base power collection and transmission substation.The substation 500 kV adopts the extended line-transformer group connection mode,the 220 kV section adopts the double busbar connection mode,and the35 kV section adopts the single bus line connection.Based on the operation requirements of Qingfeng 500 kV substation,this paper uses reactive power compensation equipment and control technology.It mainly studies the reactive power compensation scheme and its control strategy at the access point,and combines the actual operation of the wind farm to design and calculate the compensation device.It is used to improve the power factor and voltage adjustment rate of the wind power generation system,improve the balance of the three-phase voltage,and achieve the purpose of system stable operation and energy saving.The main contents are as follows:1.Analyze the wind power change requirements of wind power bases,and the grid’s reactive power configuration requirements for wind power bases to determine the necessity of compensation.By analyzing the reactive characteristics of Qingfeng 500 kV substation,the configuration of reactive compensation capacity was determined.Through the determination of the reactive capacity of the access point of the wind farm group and the determination of the ratio of the capacitor bank and the dynamic reactive compensation capacity,a reactive compensation technology plan is finally formulated.2.Comparing and analyzing different types of reactive power compensation devices,and analyzing the voltage drop conditions and reactive power support capabilities of SVC and SVG devices in the event of a short-circuit fault,and selecting a reactive power compensation device suitable for substations.Types of.3.According to the principles of reactive power compensation and reactive power compensation,a calculation method is given to determine the reactive power controlstrategy of Qingfeng 500 kV substation.4.The access point hardware loop consists of a two-level SVG topology,a multiplexed SVG topology,a multi-level topology,and a new modular multilevel topology that ultimately determines the large-capacity SVG main circuit architecture.The calculations determine the capacity of the capacitor bank and the reactor group and the ratio of the capacitor bank and the dynamic reactive power compensation device.Then design the SVG control system and SVG protection circuit design.Finally,the key contents of realization and verification of the independent control mode and system of fixed capacitor and SVG are explained.5.Taking into account the real-time operation requirements of wind farms and the operation of reactive power compensation equipment,the analysis of the single main transformer operation in substations and the parallel operation of two main transformers in Qingfeng 500 kV substation is conducted to verify the correctness of the proposed coordinated control strategy.