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domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 09:17pm 28 Sep 2013

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Hi,

Just found this piece of equipment and as it is written in Chinglish I cut it off at the end so as not to bore you; besides, such a box would not conform to AS standards, but it makes interesting reading:

Start of ad:
Specifications

For AC Output 3 phase Wind Turbine
With Dump Load Controller & High Wind Protection
With LCD Display
With Electric Brake

1000w On Grid Tie Wind Inverter with LCD Display

with Dump Load Controller,

For 3 Phase Wind Turbine,AC 22v-60V input to AC 190-260V

Wind Grid Tie Inverter 1000w 1kw with LCD display

For AC Output Wind Turbine

Build In Dump Load Controller

Build In High Wind Protection

Build In LCD Display

Build In Electric Brake System

Preface

The grid tie inverter can transfer wind energy from wind generators directly in to the home grid using no extra equipment. It can be connected to any outlet (conventional network) in the home. The grid �tie inverter controls the phase and the frequency and voltage of the power generated by the wind generator. It produces a pure sine wave and matches that of the grid. This model grid� tie has designed for wind turbines that put out 3 phases AC voltage. It can maintain the rotating speed of the wind turbine and keep the voltage from the wind turbine always at the range of the rated range of the grid tie inverter. It also has a high voltage protection function, when the wind is too big, and the dump load controlling system can�t keep the out put voltage from the wind ...................................

My end of ad.

Interesting that Chinese industry is working on such grid tie converters for wind. Another search via Google told me the big US names are still working on this problem of non-solar grid tie; this does not mean this Chinese co. has licked the problem but it is probably an interesting read.

Has it been solved?

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

domwild
Guru

Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 01:18pm 01 Oct 2013

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Does not seem to be a very mature product as I found these two problems judging by the description of the product. Tries to solve the islanding problem and overpowering problem by cutting itself off. This email was sent to them:

Two possible problems:

1. When mains power fails, then the inverter cuts itself off, this would mean the windmill is over speeding and it will destroy itself. It should cut itself off from the main and put the dump load resistor on if there is no need for energy from the house. When mains power fails, this is exactly the time when power is needed in the house. It may need a small battery for the control functions of the mill.

2. When the wind is too strong and the dump load resistor cannot keep up in wasting the energy, then your inverter cuts itself off, once again the mill is over speeding. It should then automatically "kill" the mill with the kill switch. The kill switch is not automatic, it is only manual.

All this you can get for about $390 FOB.

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

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