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Electrical System Design and Basic Control with Simulink

Electrical System Design and Basic Control with Simulink. IEEE student board – IEEE PELS/IAS joint chapter Author: Elisabeth Vandeventer. Outline. Introduction to the project Development of a simple wind turbine model Presentation of the load and grid models

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Electrical System Design and Basic Control with Simulink

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  1. Electrical System Design and Basic Control with Simulink IEEE student board – IEEE PELS/IAS joint chapter Author: Elisabeth Vandeventer

  2. Outline • Introduction to the project • Development of a simple wind turbine model • Presentation of the load and grid models • Interconnection of the network elements • Implementation of secondary source and storage • Assignment

  3. Introduction to the project • Experimental network for isolated village • 100 households, cold climate; • Windy area, river nearby Your goal: Design a control system to regulate the power flow in the network and make it stand-alone Your power sources: • Primary: 60kW wind turbine • Secondary: hydropower turbine located on the river • Storage: battery bank

  4. Simple wind turbine model • 60kW wind turbine • Power curve from provider • Steady-state values  need to make it dynamic • Addition of inertia time constant: • Final model http://www.icrepq.com/icrepq07/361-gonzalez.pdf

  5. Load model • Dynamic three-phase load • Input: PQ • Connect to the three phase grid

  6. Infinite grid representation • Three phase, 230Vrms line-to-line • Ideal representation:

  7. Interconnection of the blocks • Use of an idealistic converter: use source output power as input and transforms it into 3 phase current waveforms

  8. Power flow • Primary source uncontrollable • Infinite grid needs to provide power • System is not stand-alone! • Need addition of: • Controllable secondary source: hydropower turbine • Electricity storage: battery bank

  9. Hydropower turbine • Mathematical model: • Addition of inertia time constant , maximum power output (saturation) and valve control • Output power sent to ideal converter for connection to the grid • Controlled through the use of the valve

  10. Battery bank • Available in SimPowerSystems library • Charged/discharged with CCS • Monitoring State Of Charge for control • Use to send to converter and connect to the grid

  11. Assignment – goal • Your goal: (close to) no exchanged power with the grid • How to achieve that: • Resize the secondary source and battery bank • Write a clever control scheme that will handle the power flow

  12. Assignment – input and outputs • Inputs to the model: • Load profile • Wind profile • Constant water flow • Quantities to visualize: • Wind power • Hydro power • Load consumption • Battery SOC • Power exchange with the grid

  13. Assignment – control signals • Wind power  uncontrollable • Hydropower turbine • Monitor: output power • Control with: valve opening • Battery: • Monitor: state of charge • Control with: power to inject/draw • Infinite grid: power exchange occurs automatically to ensure power balance (nothing to do)

  14. Assignment – sources parameters • Wind turbine: • Spec sheet: NPS 60-24 • Inertia time constant: • Hydropower turbine: • Battery bank • Type: lead-acid • Initial SOC: 50% • Min/max SOC: 15-95% • Response time: 1s • Discharge currents:[6.5 13 32.5] • Rated capacity: 16kAh • Warning: parameters in red might need to change GOOD LUCK!

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