Evaluation of Virtual Inertia Control Strategies for MMC-based HVDC Terminals by P-HiL Experiments

This paper presents an experimental performance evaluation of different control strategies for providing virtual inertia from power electronic converters. The evaluation is based on a laboratory-scale prototype of a point-to-point HVDC transmission system with Modular Multilevel Converters (MMCs). Operation with a grid emulator connected to a realtime simulator reproduces the behavior of a power system and allows Power-Hardware-in-the-Loop (P-HiL) experiments. Control of the inverter terminal for providing virtual inertia to the simulated power system is evaluated with four different control system implementations. The four cases include a conventional control system enhanced with df/dt-based inertia emulation functionality and three different Virtual Synchronous Machine (VSM) implementations based on emulation of a synchronous machine swing equation. The dynamic response in the power flow and the frequency transients are evaluated for all cases, and the inertial energy exchanged with the isolated power system is assessed in comparison to a conventional power controller without inertia emulation. The results demonstrate that all the evaluated implementations can provide similar inertial response when operated in a small isolated grid, while clear differences in dynamic response and stability properties are revealed during operation under strong grid conditions.

[1]  Jun Wang,et al.  Application of virtual synchronization control strategy in MMC based VSC-HVDC system , 2014, 2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC).

[2]  Jon Are Suul,et al.  Operation of a Modular Multilevel Converter Controlled as a Virtual Synchronous Machine , 2018, 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia).

[3]  Ramadan El-Shatshat,et al.  Comprehensive assessment of virtual synchronous machine based voltage source converter controllers , 2017 .

[4]  H.-P. Beck,et al.  Virtual synchronous machine , 2007, 2007 9th International Conference on Electrical Power Quality and Utilisation.

[5]  Pedro Rodriguez,et al.  Grid support functionalities based on modular multilevel converters with synchronous power control , 2016, 2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA).

[6]  Jing Zhang,et al.  Synchronous Generator Emulation Control Strategy for Voltage Source Converter (VSC) Stations , 2015, IEEE Transactions on Power Systems.

[7]  Khadija Ben Kilani,et al.  Synchronverter-based emulation and control of HVDC transmission , 2017, 2017 IEEE Power & Energy Society General Meeting.

[8]  Jon Are Suul,et al.  Evaluation of Virtual Synchronous Machines With Dynamic or Quasi-Stationary Machine Models , 2017, IEEE Transactions on Industrial Electronics.

[9]  Adam Dysko,et al.  Investigations of the Constraints relating to Penetration of Non-Synchronous Generation (NSG) in Future Power Systems , 2015 .

[10]  P. Kundur,et al.  Power system stability and control , 1994 .

[11]  Vera Silva,et al.  Impact of high penetration of variable renewable generation on frequency dynamics in the continental Europe interconnected system , 2016 .

[12]  Salvatore D'Arco,et al.  Comparative Analysis of Small-Signal Dynamics in Virtual Synchronous Machines and Frequency-Derivative-Based Inertia Emulation , 2018, 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC).

[13]  Paul Smith,et al.  Studying the Maximum Instantaneous Non-Synchronous Generation in an Island System—Frequency Stability Challenges in Ireland , 2014, IEEE Transactions on Power Systems.

[14]  Andrew J. Roscoe,et al.  Inertia Emulation Control Strategy for VSC-HVDC Transmission Systems , 2013, IEEE Transactions on Power Systems.

[15]  J. Peralta,et al.  Detailed and Averaged Models for a 401-Level MMC–HVDC System , 2012, IEEE Transactions on Power Delivery.

[16]  Josep M. Guerrero,et al.  Generic inertia emulation controller for multi-terminal voltage-source-converter high voltage direct current systems , 2014 .

[17]  Pedro Rodriguez,et al.  Inertia Emulation in AC/DC Interconnected Power Systems Using Derivative Technique Considering Frequency Measurement Effects , 2017, IEEE Transactions on Power Systems.

[18]  Mohamed Elleuch,et al.  Stability improvement of the interconnection of weak AC zones by synchronverter-based HVDC link , 2017 .

[19]  Toshifumi Ise,et al.  Virtual synchronous generators: A survey and new perspectives , 2014 .

[20]  Jon Are Suul,et al.  Virtual synchronous machines — Classification of implementations and analysis of equivalence to droop controllers for microgrids , 2013, 2013 IEEE Grenoble Conference.

[21]  Boris Fischer,et al.  Modeling and Design of $df/dt$ -Based Inertia Control for Power Converters , 2017, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[22]  Qing-Chang Zhong,et al.  Synchronverters: Inverters That Mimic Synchronous Generators , 2011, IEEE Transactions on Industrial Electronics.

[23]  Alvaro Luna,et al.  Multi-terminal HVDC grids with inertia mimicry capability , 2016 .

[24]  M. Steurer,et al.  Improve the Stability and the Accuracy of Power Hardware-in-the-Loop Simulation by Selecting Appropriate Interface Algorithms , 2008, IEEE Transactions on Industry Applications.

[25]  Jon Are Suul,et al.  A Virtual synchronous machine implementation for distributed control of power transformers in SmartGrids , 2015 .

[26]  Alvaro Luna,et al.  Unified reference controller for flexible primary control and inertia sharing in multi-terminal voltage source converter-HVDC grids , 2017 .

[27]  T. Ise,et al.  Stabilization of a power system with a distributed generator by a Virtual Synchronous Generator function , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[28]  N. Jenkins,et al.  Comparison of the response of doubly fed and fixed-speed induction generator wind turbines to changes in network frequency , 2004, IEEE Transactions on Energy Conversion.