pilotprojekts – vied ās m jas « Ģimenes m ja vähjö» zviedrij...

Pilotprojekts – Viedās mājas «Ģimenes māja Vähjö» Zviedrijā

Rīga

Viesnīca Radisson Blu Latvija

Dr. Jānis Stabulnieks

Latvijas Tehnoloģiskais centrs

05.02.2019

Pilot Smart Houses – Implementation and results

Agenda

- The house and the family living in the house

- Objectives with the pilot

- The project team

- Products and systems

- Practical solutions

- Activities

- Experiences and conclusions

- Consequences and future activities

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5

Background

- The villa was already equipped with 20 solar panels with a capacity of about 5000 kWh per year

- 14 solar collectors to warm up water

- It is a plus energy house with 45 degree roof with south orientation

- In the house lives a family withfour people

Objectives

• Achieve higher energy efficiency by using intelligent control systems and power electronic-based solutions

• Use Solar panels, batteries and DC solutions

• To reduce losses in converters

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The Pilot Team

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The building organisation ”Sustainable Smart Houses in

Småland”

The family living in the house

Natek Power Systems, power electronics and system design

RISE (Kista), project management and technical support

+ UPN, Power electronic solution

+ Elajo, Installation

UPN

The Pilot Team Project planning

- Project leadership

- Activities

- Time schedule

- Costs

- Risk analysis

- Working methods

- Communication

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From theory to physical activities

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Products and systems needed

- Two new grids- Expanded DC use- Island operation

- Products, components and system- Batteries, chargers, converters- Wall outlets, spotlights, displays- Installation rack, wiring, sensors- Grounding equipment- Steering and control system

- Manuals and documentations

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Island mode operation relates to power plants that operate in

isolation from the national or local electricity distribution

network.

There are two key types of island mode operation:

Stand-alone generators not connected to the electricity grid

Generators connected to the electricity grid in parallel

mode, meaning they can generate power independently in

the event of a grid power outage

Supply to consumers: with an option to choose between 50 and

60 Hz drive, these types of plants are typical of basic

installations and mobile generator sets.

Activities

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- Drawings

- Purchase of products and components

- System construction and test

- Grids, wiring and grounding

- Physical installation in the house

- Measuring and further tests

- Workshops and seminars

Expanded DC in the house

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Running on DC:

All fixed lightning in ceiling, all electronic

devices

Six wall contacts installed with DC

Grounding for safety

Installation of steering and control

IEC Plug 400V DC, 7A

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Island operation in the house

Batteries and expanded DC

DC/AC converter for use in case of

power failure

New grid for fridge, freezer, micro

and ventilation

Steering and control

Prepared for external generator

Constructed system summary• Specification, design, construction and installation of an

AC and DC hybrid electrical micro building grid with a storage battery.

• System is standalone with full islanding capacity in full service in a family

home.

• Battery is connected to both 230 AC and DC 350 V

• => supporting lighting, communications equipment and appliances.

• => Some electrical equipment is operated directly from a battery

without conversion to ac.

• An energy storage management system and software program have been

developed and verified.

• System installed in a family home and

fully complying with today’s electrical installation rules.

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System Block Diagram , January 2018

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AC Grid

Original AC:

3-phase and

fixed single-

phase outlets

Original AC installation

Credit: Cliparts from clipground.com, licence CC BY 4.0


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AC Grid

Original AC:

3-phase and

fixed single-

phase outlets

DC installationPowered from the AC grid

DCACDC loads

Fixed Outlets

&

Wall outlets



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AC Grid

Original AC:

3-phase and

fixed single-

phase outlets

DC installation Powered from the solar cells

DCACDC loads

Fixed Outlets

&

Wall outlets


PV string 1

PV string 2

DCDC

MPPT Charger

Measurement & control


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AC Grid

Original AC:

3-phase and

fixed single-

phase outlets

DC installation Selling locally-produced electricity

DCACDC loads

Fixed Outlets

&

Wall outlets


PV string 1

PV string 2

DCDC

MPPT Charger


DCAC

BreakerSunny Boy3 phase


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AC Grid

Original AC:

3-phase and

fixed single-

phase outlets

DC installation Storing electricity

DCACDC loads

Fixed Outlets

&

Wall outlets


PV string 1

PV string 2

DCDC

MPPT Charger


DCAC


Battery

Charger


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AC Grid

Original AC:

3-phase and

fixed single-

phase outlets

AC + DCIslanding

DCACDC loads

Fixed Outlets

&

Wall outlets


PV string 1

PV string 2

DCDC

MPPT Charger


DCAC


Battery

Charger

DCAC

Islanding Inverter

AC loadsSingle phase

fixed outlets &

wall outlets

Experiences

Positive experiences

- Renewable energy can be stored and used efficiently

- Less purchased energy

- Less losses by avoiding converting DC-AC

- Much can run on DC

- The household is less vulnerable in case of power failure

- 350 volt DC works fine.

- Steering and Control system works fine

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Experiences

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Negative experiences

- Small financial benefits

- Limited acces to components

- Limited experience and compability between components

- Unexpected errors in components

- Batteries have short life

- Most appliances are produced for AC

Future consequences and activities

- Project partners

- Market

- Family in the house

- More research

- Expanded new projects

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