Integration of UPQC for Power Quality improvement in distributed generation network - a review <s> II. INTEGRATION OF UPQC <s> Power Quality Enhancement Using Custom Power Devices considers the structure, control and performance of series compensating DVR, the shunt DSTATCOM and the shunt with series UPQC for power quality improvement in electricity distribution. ::: Also addressed are other power electronic devices for improving power quality in Solid State Transfer Switches and Fault Current Limiters. Applications for these technologies as they relate to compensating busses supplied by a weak line and for distributed generation connections in rural networks, are included. In depth treatment of inverters to achieve voltage support, voltage balancing, harmonic suppression and transient suppression in realistic network environments are also covered. New material on the potential for shunt and series compensation which emphasizes the importance of control design has been introduced. ::: Power Quality Enhancement Using Custom Power Devices is appropriate for distribution engineers, graduate engineers and designers working in the area of power electronic applications for power systems. Sections of the book on power quality issues and generation connection make for a timely reference for undergraduates studying distribution engineering. ::: Written for: ::: Distribution engineers, graduate engineers and designers working in the area of power electronic applications for power systems, students <s> BIB001 </s> Integration of UPQC for Power Quality improvement in distributed generation network - a review <s> II. INTEGRATION OF UPQC <s> This paper describes analysis results of a combined operation of the unified power quality conditioner with the distributed generation. The proposed system consists of a series inverter, a shunt inverter, and a distributed generator connected in the dc link through a rectifier. The proposed system can compensate voltage sag and swell, voltage interruption, harmonics, and reactive power in both interconnected mode and islanding mode. The performance of proposed system was analyzed using simulations with power system computer aided design/electromagnetic transients dc analysis program, and experimental results with the hardware prototype. The proposed system can improve the power quality at the point of installation on power distribution systems or industrial power systems. <s> BIB002 </s> Integration of UPQC for Power Quality improvement in distributed generation network - a review <s> II. INTEGRATION OF UPQC <s> The ability of wind generation to remain connected to the grid in the event of system faults and dynamic reactive power compensation are two aspects of grid integration, which have received particular attention. The wind driven, fixed-speed induction generator (FSIG) on its own fails to fulfil these requirements of grid integration. The application of a unified power quality conditioner (UPQC) to overcome the grid integration problems of the FSIG is investigated. The role of the UPQC in enhancing the fault ride-through capability of the generator is also investigated under both full and partial terminal voltage restoration. A realistic estimation of the rating requirements of UPQC for this type of application is carried out. A general principle is presented to choose the most practical and economical rating of the UPQC. The performance comparison of a UPQC and a static synchronous compensator to aid fault ride-through capability of a 2 MW FSIG under Irish grid code requirements has been carried out and the UPQC is found to be more economical in relation to device rating. <s> BIB003 </s> Integration of UPQC for Power Quality improvement in distributed generation network - a review <s> II. INTEGRATION OF UPQC <s> The use of Dispersed or Distributed Generation (DG) has been increased in recent years to fill the gap between supply and demand of energy, as the sources of conventional power generation are depleting fast. DGs through static compensators are also used for improving the power quality of distribution systems like mitigation of voltage dips and compensation of harmonics. Shunt, series, and series-shunt type of configuration of static compensators combined with DG have been proposed in the literature. This paper presents a feasibility analysis of DGSC-UPQC (Distributed Generation based Static Compensator as Unified Power Quality Conditioner), a series-shunt type of static compensator with DG. The analysis has been carried from technical and economical aspects when the device i.e. DGSC-UPQC is used for compensation of unbalance in source voltages and load currents and power factor improvement. Simulation results show the capability of the DGSC-UPQC to compensate the unbalance in source voltages and load currents satisfactorily. <s> BIB004
Recent reports BIB002 BIB001    BIB004 BIB003  show that significant research and development has been carried out on the application of UPQC to DG integrated network. As the UPQC can compensate for almost all existing PQ problems in the transmission and distribution grid, placement of a UPQC in the distributed generation network can be multipurpose. As a part of integration of UPQC in DG systems, research has been done on the following two techniques: DC-Linked and Separated DG-UPQC systems.