experiences of introducing model based design at danfoss

1Danfoss Power Electronics

Experiences of introducing Model Based Design at Danfoss Solar Inverters

Matlab Expo | NordicStockholm, May 22nd, 2014


Our business is power electronics

… high-quality energy-efficient solutions that save energy and optimize processes

Drives

Solar Inverters Power Modules

37 milliontons of CO2 are saved every year

by the 4 million VLT® variable speed

drives installed worldwide from

Danfoss. 21 milliontons of CO2 are saved annually

through the solar powered

electricity systems that are

installed worldwide.


Application example

Residential rooftop installation

Peak output power: 10kW

1 inverter


Application example

Former Eggebek airfield in Germany

Peak output power: 84 MW

371.089 PV modules

5061 TLX string inverters


Look around for a design process

Traditional hand written code vs. Model Based Design ?


Important parameters

One master source

Code efficiency

Project time schedule

Training


A pilot project

Study the auto code generation

Code generation options

Customized TFL (Target Function Library)

Test the attainable code efficiency

Study different implementation principles

Simulink models

Matlab script

C-mex inclusion

StateFlow charts


Implementation

MathWorks support

Review – feed back – team learnings

Ensure project time schedule

Model iterations for code efficiency

Model constructions influences the code efficiency

Complete inverter model, incl. hardware model

Very accurate simulation results

Great improvement in design iteration


Model Based Design have become more accessible

MBD advantages:

Specification

Prototyping

Design with simulation

Automatic code generation

Continuous test and verification

Aero space

Automotive

Medico

Consumer products

Design

with

Simulation

Executable

Specifications

Automatic

Code

Generation

Continuous

Test and

Verification

Models

Source: MathWorks


Summary 1st project

Project time frame was met

Test and certification campaign went very smooth

Thanks to the accurate up-front simulations

Build a knowledge base for forthcoming product developments


Summary 2nd project

Reuse of 1st project models

Fast project ramp up

More engineers involved in MBD

Adopted the MAAB model guideline

Reduced development time


Impressions from initial projects

Steep learning curve

Dedicated team members accepting new tools

Rapidly increasing model quality

A ‘best practice’ evolved over time; fortunately very similar to MAAB.

Code efficiency similar to handwritten code

However required some effort

Two PV inverters designed with MBD

Reduced development time


Future plans for our MBD implementation

Maturing our model guideline

Establish a ‘test by simulation’ approach

HIL, SIL, PIL ?

experiences of introducing model based design at danfoss

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