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Projects: Projects for Investigator
Reference Number	NIA_NGTO045
Title	Risk mitigation of power electronics connections
Status	Completed
Energy Categories	Other Power and Storage Technologies(Electricity transmission and distribution) 100%;
Research Types	Applied Research and Development 100%
Science and Technology Fields	ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 100%
UKERC Cross Cutting Characterisation	Not Cross-cutting 100%
Principal Investigator	Project Contact No email address given National Grid Electricity Transmission
Award Type	Network Innovation Allowance
Funding Source	Ofgem
Start Date	01 March 2020
End Date	01 March 2021
Duration	ENA months
Total Grant Value	£255,000
Industrial Sectors	Power
Region	London
Programme	Network Innovation Allowance
Investigators	Principal Investigator	Project Contact , National Grid Electricity Transmission (100.000%)
	Industrial Collaborator	Project Contact , National Grid Electricity Transmission (0.000%)
Web Site	https://smarter.energynetworks.org/projects/NIA_NGTO045
Objectives	The research project will develop a methodology to predict control interactions using impedance modelling and measurement in the frequency domain, and impedance-based design guidelines for power electronic converter control systems to manage the risks associated with control interactions.The project will establish an impedance measurement method for the black-box models received from the suppliers for Wind-farms and STATCOMs. The impedance dependence on different operating modes and control parameters such as hardware delays will be estimated. The project will also develop a method for the estimation of the impedance of the network with a high degree of power electronics. The potential control interaction of a new power electronic connection will be investigated using impedance stability analysis. A reduced network model will be developed to represent the AC network for this analysis. The proposed methodology will be further validated by EMT simulations and eigen value analysis. Work Package 1: A) Impedance characterisation of STATCOMs(i) Develop a dynamic model for full bridge modular multi-level converter (MMC) based STATCOM which will meet the requirement of the dynamic aspect of GB grid code. (ii) Estimate the impedance characteristics of the STATCOM from the network connection point and analyse the impact of various gains, different control strategy, operating mode and delays including negative sequence impedance. B) Impedance characterisation of Windfarmsi) Develop a dynamic model of a Type 4 single wind turbine to meet the GB grid code dynamic requirements. ii) Estimate the impedance of individual wind turbines for various operating scenarios such as impact of control modes, controller gains and hardware/ software delays. iii) Develop an aggregated wind farm model for impedance stability analysis. C) Develop the general guidelines and methodology for modelling and estimation of power electronic converter impedance for stability analysis. Work Package 2: A) Development of network Impedance estimation method(i) Explore how the various components of electrical networks should be modeled, especially power electronic converters, for impedance estimation. (ii) Develop a methodology to perform the network impedance estimation for predicting potential instabilities. B) Stability analysis using impedance estimationi) Evaluate the control interaction issue for a new power electronics connection (Windfarm/ STATCOM) with the modelled network. Perform a sensitivity analysis of possible control interaction risks for different operating conditions and control parameters.ii) Validate the identified issues using EMT simulations and eigen value analysis.iii) Perform parameter tuning or design a new control loop for the new power electronics connection to mitigate the risks identified using sensitivity analysis. Develop impedance-based design guidelines for power electronic converter control systems to mitigate the risks of control interactions. The objective of this work is to develop a methodology for:(1) Identifying the risks associated with the stability and control interaction before a new power electronic device (e.g. Windfarm, interconnector, STATCOM) is introduced to the network using impedance based stability analysis. (2) Develop impedance-based design guidelines for power electronics converter control systems to manage the risks of control interactions.
Abstract	Power electronics devices rely on complex dynamic control and high-frequency switching to perform their basic functions and meeting power quality and dynamic response requirements. However, the rapid dynamic control and fast switching of power electronics are introducing new system integration problems. A growing issue in the industrial community is the influence of these complex dynamic control systems and grid parameters (AC/DC) on the resonance and oscillatory behaviour of the entire system due to control interactions. The two main goals of this research project are to:- Establish a methodology to predict control interactions using impedance modelling and measurement.- Develop impedance-based design guidelines for power electronic converter control systems to manage the risks of control interactions.
Publications	(none)
Final Report	(none)
Added to Database	02/11/22