Research On Grid Connection Of Wind Power Based On Hybrid Reactive Power Compensation System

As the installed capacity of wind power continues to increase,when a large number of wind farms are integrated into the grid,it may cause a certain degree of deviation in voltage.If the capacity of reactive power compensation does not meet the needs of the grid,it will affect the stability of the system voltage,and in severe cases may cause voltage flicker.Therefore,in terms of ensuring power quality,the compensation of reactive power plays a vital role.This paper proposes a hybrid reactive power compensation system,which combines the advantages of the thyristor switching capacitor and the static synchronous compensator,which compensates for each other’s shortcomings and reduces the cost.The hybrid reactive power compensation system realizes fast and effective reactive power support for wind farms and maintains the voltage stability of the wind power grid connection point,which has good practical significance and development prospects.Explain the development and research status of wind power,analyze the role and influence of commonly used reactive power compensation devices in wind farms,and focus on the study of two reactive power compensation devices,thyristor switching capacitors and static synchronous compensators,and analyze them Compensation principles,structural features,performance advantages,etc.For the thyristor switching capacitor,its structure is simple,cost-effective,and compensation capacity is large,but it has the disadvantages of slow compensation speed and poor compensation accuracy.In contrast,the static synchronous compensator responds quickly,compensates accurately,and has superior filtering performance.But the static synchronous compensator also has the disadvantages of high cost and small compensation capacity of the system.Therefore,this article combines the high cost performance of the thyristor switching capacitor and the advantages of continuous and accurate compensation of the static synchronous compensator to form a hybrid reactive power compensation system.Analyzed the basic principles of the hybrid reactive power compensation system,designed the equivalent circuit diagram according to the network topology of the hybrid reactive power compensation system,calculated the capacity ratio of the thyristor switching capacitor and the static synchronous compensator,and focused on the hybrid reactive power compensation The control strategy of the system uses traditional control methods for the thyristor switching capacitors to achieve the balance of reactive power,and uses direct current control methods for the static synchronous compensator to achieve dynamic reactive power tracking control.The CEPRI 7 node wind turbine system model is established through the integrated power system analysis software,and the PV curve on the load side of the CEPRI 7 node is obtained through simulation analysis.The simulation results show that the hybrid reactive power compensation system proposed in this paper can quickly provide voltage support to the wind farm.A wind farm in a certain area was modeled and simulated,and the steady-state and transient conditions were simulated and simulated.The simulation results show that when the power grid is in steady state operation,through the coordination between the capacitor bank and the static reactive power compensator,the effective control of the reactive power of the grid connection point is realized,and the voltage quality has been significantly improved.When the power grid is in a fault or when the fault is restored,the hybrid reactive power compensation system effectively improves the voltage support capacity of the grid connection point,improves the voltage quality of the grid connection point,and has a certain economic and practical value.