Hierarchical Control of Multiterminal DC Grids for Large-Scale Renewable Energy Integration

In this paper, a hierarchical control framework is proposed for multiterminal dc (MTDC) grids with large-scale renewable power generations. In the primary control, dc voltage droop control is adopted for the multiple voltage source converters (VSCs) connected to ac main grids. A novel optimal control strategy with enhanced flexibility and compatibility has been developed in the secondary control, which can simultaneously address issues including dc grid loss minimization, power sharing accuracy among droop-based VSCs, and influence of possible power disturbances during the optimization intervals on dc voltages security. After thorough theoretical analysis and study on an tested five-terminal dc grid, a cosimulation platform based on PSCAD/EMTDC and MATLAB has been setup to verify the proposed hierarchical control, with the dynamics of main circuits of MTDC dc grid and primary controllers simulated in PSCAD, and the novel secondary optimal control strategy implemented in MATLAB.

[1]  Rong Zeng,et al.  Hybrid HVDC for Integrating Wind Farms With Special Consideration on Commutation Failure , 2016, IEEE Transactions on Power Delivery.

[2]  Luis Rouco,et al.  Active Power Control Strategies for Transient Stability Enhancement of AC/DC Grids With VSC-HVDC Multi-Terminal Systems , 2016, IEEE Transactions on Power Systems.

[3]  Ahmed M. Massoud,et al.  Optimum Power Transmission-Based Droop Control Design for Multi-Terminal HVDC of Offshore Wind Farms , 2013, IEEE Transactions on Power Systems.

[4]  Andreas Sumper,et al.  Optimum voltage control for loss minimization in HVDC multi-terminal transmission systems for large offshore wind farms , 2012 .

[5]  Yasser Abdel-Rady I. Mohamed,et al.  Integrating VSCs to Weak Grids by Nonlinear Power Damping Controller With Self-Synchronization Capability , 2014, IEEE Transactions on Power Systems.

[6]  Ronnie Belmans,et al.  Analysis of Power Sharing and Voltage Deviations in Droop-Controlled DC Grids , 2013, IEEE Transactions on Power Systems.

[7]  Oriol Gomis-Bellmunt,et al.  DC Voltage Droop Control Design for Multiterminal HVDC Systems Considering AC and DC Grid Dynamics , 2016, IEEE Transactions on Power Delivery.

[8]  Pedro Rodriguez,et al.  Virtual Synchronous Power Strategy for Multiple HVDC Interconnections of Multi-Area AGC Power Systems , 2017, IEEE Transactions on Power Systems.

[9]  Ronnie Belmans,et al.  Modeling of Multi-Terminal VSC HVDC Systems With Distributed DC Voltage Control , 2014, IEEE Transactions on Power Systems.

[10]  Oriol Gomis-Bellmunt,et al.  Methodology for Droop Control Dynamic Analysis of Multiterminal VSC-HVDC Grids for Offshore Wind Farms , 2011 .

[11]  Li Guo,et al.  A Nonlinear-Disturbance-Observer-Based DC-Bus Voltage Control for a Hybrid AC/DC Microgrid , 2013, IEEE Transactions on Power Electronics.

[12]  Lingling Fan,et al.  Minimizing DC System Loss in Multi-Terminal HVDC Systems through Adaptive Droop control , 2015 .

[13]  T. M. Haileselassie,et al.  Impact of DC Line Voltage Drops on Power Flow of MTDC Using Droop Control , 2012, IEEE Transactions on Power Systems.

[14]  Oriol Gomis-Bellmunt,et al.  Droop control for loss minimization in HVDC multi-terminal transmission systems for large offshore wind farms , 2014 .

[15]  Wei Tian,et al.  Integration of Large-Scale Offshore Wind Energy via VSC-HVDC in Day-Ahead Scheduling , 2016, IEEE Transactions on Sustainable Energy.

[16]  B. Chaudhuri,et al.  Adaptive Droop Control for Effective Power Sharing in Multi-Terminal DC (MTDC) Grids , 2013, IEEE Transactions on Power Systems.

[17]  Magdy M. A. Salama,et al.  A Planning Approach for the Network Configuration of AC-DC Hybrid Distribution Systems , 2018, IEEE Transactions on Smart Grid.

[18]  Ronnie Belmans,et al.  A classification of DC node voltage control methods for HVDC grids , 2013 .

[19]  Liangzhong Yao,et al.  DC voltage control and power dispatch of a multi-terminal HVDC system for integrating large offshore wind farms , 2011 .

[20]  Stamatios Chondrogiannis,et al.  Market Integration Scheme of a Multi-Terminal HVDC Grid in the North Seas , 2016, IEEE Transactions on Power Systems.

[21]  Pavol Bauer,et al.  Optimal Power Flow Control of VSC-Based Multiterminal DC Network for Offshore Wind Integration in the North Sea , 2013, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[22]  Oriol Gomis-Bellmunt,et al.  Hierarchical power control of multiterminal HVDC grids , 2015 .

[23]  Alvaro Luna,et al.  DC Voltage Control and Power Sharing in Multiterminal DC Grids Based on Optimal DC Power Flow and Voltage-Droop Strategy , 2014, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[24]  Ahmed M. Massoud,et al.  A Droop Control Design for Multiterminal HVDC of Offshore Wind Farms With Three-Wire Bipolar Transmission Lines , 2016, IEEE Transactions on Power Systems.

[25]  Ronnie Belmans,et al.  Generalized steady-state VSC MTDC model for sequential AC/DC power flow algorithms , 2013, 2013 IEEE Power & Energy Society General Meeting.

[26]  Pavol Bauer,et al.  A Novel Distributed Direct-Voltage Control Strategy for Grid Integration of Offshore Wind Energy Systems Through MTDC Network , 2013, IEEE Transactions on Industrial Electronics.

[27]  Gengyin Li,et al.  An Enhanced DC Voltage Droop-Control for the VSC--HVDC Grid , 2017, IEEE Transactions on Power Systems.

[28]  John E. Fletcher,et al.  Power flow and transmission loss analysis of modular multi-level converter based multi-terminal high-voltage DC systems , 2016 .

[29]  Kaigui Xie,et al.  Evaluation model and algorithm for wind farm capacity credit considering effect of storage systems using the bisection method , 2014, 2014 IEEE PES General Meeting | Conference & Exposition.

[30]  Oriol Gomis-Bellmunt,et al.  Control of multi-terminal HVDC networks towards wind power integration: A review , 2016 .

[31]  Alvaro Luna,et al.  Hierarchical Control of HV-MTDC Systems With Droop-Based Primary and OPF-Based Secondary , 2015, IEEE Transactions on Smart Grid.

[32]  Alvaro Luna,et al.  A generalized voltage droop strategy for control of multi-terminal DC grids , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[33]  Robert Eriksson,et al.  A New Control Structure for Multiterminal DC Grids to Damp Interarea Oscillations , 2016, IEEE Transactions on Power Delivery.