Modelling of multi-terminal HVDC systems in optimal power flow formulation

The multi-terminal HVDC systems and their embedded DC networks are considered as smart grids technology which improve economic efficiency of the power system. This technology allows better voltage profile in the power system by better allocation of the generation sources. Also, it can help in improving the economic efficiency of the system by substituting the high-cost generation with low-cost generation. In order to assess the technical benefit of this smart grids technology, this paper presents an optimal power flow formulation for AC grids with embedded DC networks built from multi-terminal HVDC systems. The objective function of this AC-DC OPF formulation is the total active dispatch costs. The constraints consist of (a) AC grid constraints, (b) constraints from multi-terminal HVDC systems, and (c) DC grid constraints. The formulated AC-DC OPF is a mixed-integer nonlinear optimisation problem. The formulation is coded in GAMS platform and tested on IEEE 30 Bus system.

[1]  Farrokh Aminifar,et al.  Reliability Evaluation of an HVDC Transmission System Tapped by a VSC Station , 2010, IEEE Transactions on Power Delivery.

[2]  Juan Yu,et al.  An Unfixed Piecewise-Optimal Reactive Power-Flow Model and its Algorithm for AC-DC Systems , 2008, IEEE Transactions on Power Systems.

[3]  Dirk Van Hertem,et al.  Multi-terminal VSC HVDC for the European supergrid: Obstacles , 2010 .

[4]  Dirk Van Hertem,et al.  The modeling multi-terminal VSC-HVDC in power flow calculation using unified methodology , 2011, 2011 2nd IEEE PES International Conference and Exhibition on Innovative Smart Grid Technologies.

[5]  Ronnie Belmans,et al.  A sequential AC/DC power flow algorithm for networks containing Multi-terminal VSC HVDC systems , 2010, IEEE PES General Meeting.

[6]  Francisco D. Galiana,et al.  A survey of the optimal power flow literature , 1991 .

[7]  T. J. Hammons,et al.  Role of HVDC transmission in future energy development , 2000 .

[8]  R. Adapa,et al.  A review of selected optimal power flow literature to 1993. I. Nonlinear and quadratic programming approaches , 1999 .

[9]  Ronnie Belmans,et al.  Generalized Dynamic VSC MTDC Model for Power System Stability Studies , 2010, IEEE Transactions on Power Systems.

[10]  C. N. Lu,et al.  The incorporation of HVDC equations in optimal power flow methods using sequential quadratic programming techniques , 1988 .

[11]  Enrique Acha,et al.  High voltage direct current modelling in optimal power flows , 2008 .

[12]  B. T. Ooi,et al.  Optimal Acquisition and Aggregation of Offshore Wind Power by Multiterminal Voltage-Source HVdc , 2002, IEEE Power Engineering Review.

[13]  R. Adapa,et al.  A review of selected optimal power flow literature to 1993. II. Newton, linear programming and interior point methods , 1999 .