Research On Modeling And Interactions Of FACTS Devices On Wind Farm

Along with the further promotion of the energy-saving emission reduction policyin recent years, renewable clean energy is more and more brought to the attention ofour country. Wind power generation as a mature technology has been widely used.However, due to the intrinsic characteristics of the wind turbine, the wind farm needsto compensate reactive power in order to improve the efficiency of transmittingelectricity and needs voltage support equipments in order to reduce the risk of cuttingwind turbines. So the flexible ac transmission system (FACTS) devices are more andmore applied to wind farm, which greatly improves the efficiency and stability oftransmitting electricity. However, there exist negative interactions between differentFACTS devices, which may lead to the destruction of the system stability. Aiming attwo kinds of FACTS devices, Static Var Compensator and Static Var Generator, whichare widely used on wind farm, this paper carries out the modeling research andinteraction research.This paper establishes the steady-state model and transient model on the basis ofthe structure and working principle of two typical FACTS devices, SVC and SVG.Then according to the modern control theory the linear model of multimachine powersystem with the two FACTS devices is established, which lays the foundation for thetheory analysis and time-domain simulation.The relative gain array method and NI method are combined for the theoreticalanalysis and calculation. Through calculating the relative gain array and the NIparameter, this paper researches the effect of installation distance between FACTSdevices and controller parameters to interactive influence of FACTS devices. Thenaccording to the characteristics of user-defined model in the power system analysissoftware package(PSASP) and the model analysis ahead, the user-defined models ofSVC and SVG which are suitable for the system level analysis are established. Andthey are installed in the modified system example. From the view of time-domainsimulation, the effect of installation distance between FACTS devices and controllerparameters to interactive influence of FACTS devices is researched. In this way fromboth sides of theory analysis and time-domain simulation the paper proves theexistence of the interaction between FACTS equipments as well as the influencing factors.Finally the paper puts forward an improved artificial fish algorithm that issuitable for the solution of multi-objective optimization problems. The algorithm isused on the parameter coordination optimization settings of FACTS equipments. Andthrough the simulation application on the actual wind farm in Jiuquan wind powerbase, the result is effective and it can reduce the negative interaction between FACTSdevices. Because the algorithm is used on the installed running FACTS equipments, itcan save investment and improve the utilization rate of the equipments, which provesthe effectiveness of the proposed method.