Constrained Control of Power Converters

Veaceslav Spinu

Supervisor: prof.dr.ir. P.P.J. van den BoschCo-supervisor: dr. M. Lazar

Eindhoven University of Technology29 January 2014

You own dozens of power converters

Industrial applications

Reliability, Efficiency, Precision and Speed

Construction of a power converter and the role of control

Construction of a power converter and the role of control

MeasureAction

>100,000 times/second

Act

Control _+

Reference

What are the constraints and why they matter

- Safety constraints- Actuation constraints- Control structure constraints- Limited computation resources

Car X

DestinationX

X

Main research directions

• Fixed structure control

• Variable structure control

Fixed structure control

• Set theoretic methods– design a simple feedback

controller that satisfies constraints

• Reference governors– adapt the reference such

that the operation is safe

Variable structure control

• Model Predictive Control – optimal response– complex implementation

• Hybrid Polytopic Partition framework– hardware tailored– large domain of

operation

Main research results

• Constrained control can make converters: smaller, faster and more reliable.

• Limitations of previous solutions:–Disjoint synthesis of the control gain and the contractive set in set-theoretic methods–Exponential complexity increase of the explicit MPC–Small signal distortions with the implicit MPC

• Proposed solutions–Iterative expansion of the contractive set and control gain computation–HPP framework for hardware tailored control synthesis–Dual Mode MPC for high-precision applications