Coordination Between OLTC and SVC for Voltage Regulation in Unbalanced Distribution System Distributed Generation

This paper presents a two-stage approach for solving the optimal voltage regulation problem in unbalanced radial distribution system in the presence of photovoltaic (PV) generation. The on-load tap changer (OLTC) and static VAr compensator (SVC) have been considered as the voltage control devices in this work. The formulated voltage control problem is a mixed-integer nonlinear programming problem which remains unsolved even after 8 h due to its computational burden. However, the proposed two-stage approach can solve this problem in less than 10 min. The feasibility of the proposed approach has been demonstrated on a modified IEEE 123-bus radial distribution system.

[1]  Ehab F. El-Saadany,et al.  A Control Scheme for PWM Voltage-Source Distributed-Generation Inverters for Fast Load-Voltage Regulation and Effective Mitigation of Unbalanced Voltage Disturbances , 2008, IEEE Transactions on Industrial Electronics.

[2]  Kankar Bhattacharya,et al.  Optimal Operation of Distribution Feeders in Smart Grids , 2011, IEEE Transactions on Industrial Electronics.

[3]  D. Karlsson,et al.  Voltage and Reactive Power Control in Systems With Synchronous Machine-Based Distributed Generation , 2008, IEEE Transactions on Power Delivery.

[4]  Laszlo Gyugyi,et al.  Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems , 1999 .

[5]  R.K. Varma,et al.  Nighttime Application of PV Solar Farm as STATCOM to Regulate Grid Voltage , 2009, IEEE Transactions on Energy Conversion.

[6]  T. Funabashi,et al.  Optimal Distribution Voltage Control and Coordination With Distributed Generation , 2008, IEEE Transactions on Power Delivery.

[7]  Hao Jiang,et al.  Fast response GTO assisted novel tap changer , 2001 .

[8]  Gérard Cornuéjols,et al.  An algorithmic framework for convex mixed integer nonlinear programs , 2008, Discret. Optim..

[9]  Patrick Amestoy,et al.  Hybrid scheduling for the parallel solution of linear systems , 2006, Parallel Comput..

[10]  William Kersting,et al.  Distribution System Modeling and Analysis , 2001, Electric Power Generation, Transmission, and Distribution: The Electric Power Engineering Handbook.

[11]  Balasubramaniam Natarajan,et al.  Voltage/VAR Control in Distribution Networks via Reactive Power Injection Through Distributed Generators , 2012, IEEE Transactions on Smart Grid.

[12]  Silvia Lamonaca,et al.  Unbalanced Three-Phase Optimal Power Flow for Smart Grids , 2011, IEEE Transactions on Industrial Electronics.

[13]  Lorenz T. Biegler,et al.  On the implementation of an interior-point filter line-search algorithm for large-scale nonlinear programming , 2006, Math. Program..

[14]  T. K. Saha,et al.  Voltage Variation Sensitivity Analysis for Unbalanced Distribution Networks Due to Photovoltaic Power Fluctuations , 2012, IEEE Transactions on Power Systems.

[15]  Whei-Min Lin,et al.  A Hybrid Current-Power Optimal Power Flow Technique , 2008, IEEE Transactions on Power Systems.

[16]  L.A. Kojovic,et al.  Summary of Distributed Resources Impact on Power Delivery Systems , 2008, IEEE Transactions on Power Delivery.

[17]  Tzung-Lin Lee,et al.  D-STATCOM With Positive-Sequence Admittance and Negative-Sequence Conductance to Mitigate Voltage Fluctuations in High-Level Penetration of Distributed-Generation Systems , 2013, IEEE Transactions on Industrial Electronics.

[18]  C. Cañizares,et al.  Reactive Power and Voltage Control in Distribution Systems With Limited Switching Operations , 2009, IEEE Transactions on Power Systems.