Integration of UPQC for Power Quality improvement in distributed generation network - a review <s> B. (UPQC -DG) Separated <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> B. (UPQC -DG) Separated <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> BIB002
A typical application of a UPQC might be to overcome the grid integration problems of the DG, such as the fixed-speed induction generator (FSIG) as investigated in BIB002 and shown in Figure 4 . The FSIG fails to remain connected to the grid in the event of a grid voltage dip or line fault due to excessive reactive power requirement. The drop in voltage creates overspeeding of the turbine, which causes a protection trip. With the aid of the UPQC, this fault-ride-through capability is achieved, which greatly enhances system stability. Results show ( Figure 5 ) that the UPQC is one of the best devices for the integration of wind energy system to the grid. In the case of a wind farm connected to a weak grid, UPQC can also be placed at the PCC to overcome voltage regulation problems  . In these separated systems, the series APF of the UPQC is placed near the DG side to conduct the voltage regulation by injecting the voltage in phase with PCC voltage. This type of UPQC is referred to as left shunt UPQC BIB001 . Based on the research study, in addition to the normal functionality of UPQC, some of the other advantages and disadvantages have been identified for the techniques which are given in Table 1 . 