A new unified power quality conditioner for grid integration of PV system and power quality improvement feature distribution system

Unified power quality conditioner (UPQC) is one of the most advanced flexible AC transmission system (FACTS) devices that can simultaneously and independently control both the real and reactive power Quality in a transmission line. The utilization of UPQC can result in significant reliability benefits in modern power systems. This paper proposes a reliability network model for a UPQC, which incorporates the network behavior without and with renewable operating modes. The proposed model divides the UPQC operating modes into four states, namely network without UPQC, with UPQC, power system network without renewable energy sources under UPQC state and finally in order to improve the power quality in power system network with PV as renewable energy source under UPQC. The final model also incorporates un-effected source current due the impact of load variations with UPQC in order to decide appropriate load curtailment in the reliability evaluation process. The performance of the proposed model is verified using a test system, and compared with different reliability models of UPQC. Various operating schemes, such as power system network with and with UPQC and with res based UPQC are used to illustrate the advantages of the developed models, and to examine the impacts of UPQC to improve power quality in power system network MATLAB/SIMULINK software is used.