About the company

Type
Company

Members type
innovator

Headquarters
Christchurch 8023, New Zealand

Company size
5

Founders
Geoff Henderson

Founded
2001

SDG's

  • Affordable and clean energy


Social

Website
windflow.com

Alliance member

Windflow Technology Limited


Synchronous Wind Turbine Design, Manufacture, Research & Licensing
Partner of Choice for Grid Stability

Windflow Technology Limited provides wind turbine engineering, design, research and development, production engineering and wind farm development, operations and maintenance as well as licensing:
•    its patented synchronous power-train technology (providing physical inertia and high currents for grid stability) to the mainstream wind turbine industry, for large Multi-MW or Mid-size, 3-bladed turbines or 2-bladers, and
•    its proven mid-size Windflow 500 turbine which combines the synchronous power-train with a robust, light-weight rotor that particularly suits turbulent hill-top sites (as shown at right in this photo of Te Rere Hau wind farm, Tararua Ranges, New Zealand).

Offers

Grid stability with renewables? - Yes, Wind can!

Description
Windflow’s power-train and its synchronous generator provide physical inertia and high currents for grid stability.


As renewable energy is added to modern grid systems, which have traditionally relied on large spinning turbines with directly grid-connected synchronous generators from hydro, coal and thermal power stations contributing physical inertia to the grid, the requirement for an inertial response from renewables has been brought into sharp focus.  This has been highlighted by the experience in the South Australian blackout during 2016, and is an issue under discussion by grid operators and regulators internationally.

Windflow’s synchronous wind turbines exactly fulfil the recommendations in the final report of Australian Government’s Chief Scientist Dr Alan Finkel (June 2017) on how to avoid adverse effects from increasing amounts of wind power on the grid.  This is because Windflow’s synchronous wind turbines enable the use of synchronous generators directly grid-connected, and are thus identical in all respects to the synchronous machines that have kept the lights on before the advent of wind turbines.

For more information please see our news article "Grid stability with renewables?  Yes, Wind can! - Windflow’s power-train and its synchronous generator provide physical inertia for instantaneous grid stability" on the offer webpage.

Available in
Worldwide

Categories of application
Affordable and clean energy

Sector of application
Energy distribution & management, Clean energy production

Status
Implemented


Licensing Opportunity for Windflow's patented power-train technology - Multi-MW or Mid-size, 3-bladed turbines or 2-bladers

Description
Windflow is actively seeking partnerships with wind turbine manufacturers who are at the forefront of wind energy.


Windflow is actively seeking partnerships with wind turbine manufacturers who are at the forefront of wind energy and interested to license Windflow’s proven power-train technology.

This Licensing Opportunity is available for wind turbine manufacturers of large, multi-megawatt or mid-size wind turbines.

Physical inertia and large amounts of short-circuit current are two attributes, in terms of which systems with power electronic converters/inverters (PEC) cannot compete with synchronous generators.  So wind power will cost less and be better for grid – why wouldn’t the industry opt for synchronous wind turbines?

Windflow’s system has been International Electrotechnical Commission (IEC) certified by Lloyds Register and has a track-record of more than 600 turbine-years of synchronous wind power operation.

Windflow’s power-train enables its synchronous generator to be directly connected to the grid, providing physical inertia and short-circuit current (5-10 times rated current) for grid stability the same as traditional power generators, without power electronics (which have zero inertia and can provide only about up to 1.5 times rated current).  Synchronous wind power is proven and cost-effective.  Synchronous generators enhance system security, reliability and resilience.

What does physical inertia do?  It enables grid frequency to be stable.  Any device or system with physical inertia has the momentum to “ride through the bumps”, without slackening speed.  By contrast, controlling a system with little inertia involves working very fast with the “gas pedal” to alternatively squirt in more power, or reduce the amount squirted in, depending on whether the system has slowed down or sped up.  In an electricity system, inertia normally comes from synchronous generators, which inherently (through electro-magnetic reaction) combine their physical inertia in an instantaneously co-ordinated way, even when hundreds of kilometres apart.  But most wind turbines’ generators are not synchronous like this, so the increase of renewable energy is causing system inertia to reduce.  With a low inertia electricity system, multiple generators would have to “work the gas pedal” in an instantaneously co-ordinated way, to maintain a steady frequency.  This is unproven with current power electronic converter (PEC) wind turbine technology, which has zero inertia connected to the grid and has a good chance of undershooting, overshooting, or getting out of rhythm and losing control, causing blackouts.  By contrast, Windflow’s system enables wind turbines to drive synchronous generators.

Partner with Windflow Technology:
•    Windflow's synchronous wind turbines are trusted and understood by electricity system operators, because of the physical inertia and system strength (high currents) that they provide.
•    Avoid the prospect of future constraints by electricity system operators resulting in additional costs for power electronic converters/inverters (PEC).

Please see our Windflow Synchronous Power-Train Licensing Brochure on the offer webpage.

Available in
Worldwide

Categories of application
Affordable and clean energy

Sector of application
Energy distribution & management, Clean energy production

Status
Implemented


Licensing Opportunity for Windflow's patented mid-size turbines - 500 kW

Description
Windflow is actively seeking partnerships with wind turbine manufacturers for proven, cost-effective mid-size turbines.


Windflow is actively seeking partnerships with wind turbine manufacturers for our proven, cost-effective mid-size turbines (500 kW).

This Licensing Opportunity is available for wind turbine manufacturers of mid-size wind turbines.

Windflow’s 500 kW turbine has been International Electrotechnical Commission (IEC) certified by Lloyds Register (class 1A to IEC 61400-1:2008, Edition 3) and has a track-record of more than 600 turbine-years of synchronous wind power operation.

The Windflow 500 combines synchronous generation with Windflow's proven 2-bladed rotor with pitch-teeter coupling (PTC) and its advanced teeter control system (TCS).  This is ideal for turbulent, hill-top sites where the light-weight, mid-size turbine facilitates road access and craneage, and the 2-bladed rotor's PTC and TCS handle turbulence with robustness and stability.

Our past projects are testament to our commitment to quality, and to the proven quality of our cost-effective certified wind turbines that have extensive field experience in arduous conditions.  These include our wind farms in high wind sites in New Zealand (Gebbies Pass and Te Rere Hau) and Scotland (Westray, New Holland and Ludenhill in the Orkneys, Monan in the Outer Hebrides, Easter Aberchalder in the highlands above Loch Ness, and Kingseat near Edinburgh).

Windflow’s power-train enables its synchronous generator to be directly connected to the grid, providing physical inertia and short-circuit current (5-10 times rated current) for grid stability the same as traditional power generators, without power electronics (which have zero inertia and can provide only about up to 1.5 times rated current).  Synchronous wind power is proven and cost-effective.  Synchronous generators enhance system security, reliability and resilience.

Partner with Windflow Technology:
•    Take advantage of the Windflow 500 design which is well-proven for mid-size applications.
•    Synchronous wind turbines are trusted and understood by electricity system operators, because of the physical inertia and system strength (high currents) that they provide.
•    Avoid the prospect of future constraints by electricity system operators resulting in additional costs for power electronic converters/inverters (PEC).

Please see the Windflow Mid-Size Turbine Licensing Opportunity and our Windflow Synchronous Power-Train Licensing Brochure on the offer webpage.

Available in
Worldwide

Categories of application
Affordable and clean energy

Sector of application
Energy distribution & management, Clean energy production

Status
Implemented


Field Experience with Synchronous Wind Turbines in New Zealand and Scotland

Description
Instances of short-circuit current contributing to system stability, and an instance of frequency instability.


The attributes of synchronous generators are coming into focus in Australia, Europe and China as these economies invest significantly in asynchronous renewable energy and retire synchronous fossil-fired power stations.

The South Australian blackout of 28 September 2016 in particular has made “synchronous generation” almost a household word. Windflow’s power-train enables its synchronous generator to be directly connected to the grid, providing physical inertia and short-circuit current (up to 10 times rated current) for grid stability the same as traditional power generators, without power electronics.

Physical inertia and large amounts of short-circuit current are two attributes, in terms of which systems with power electronic converters/inverters (PECs) cannot compete with synchronous generators.  PECs have zero inertia and can provide only about up to 1.5 times rated current.

Please see the paper "Field Experience with Synchronous Wind Turbines in New Zealand and Scotland" by Geoff Henderson, presented at the “16th International Workshop on Large-Scale Integration of Wind Power” 25 - 27 October 2017 in Berlin and our Windflow Synchronous Power-Train Licensing Brochure on the offer webpage.

Categories of application
Affordable and clean energy

Sector of application
Energy distribution & management, Clean energy production

Status
Implemented