mppt table / Evance R9000

[RENAULT Francois]

hi all,
i m' Francois , from France ( nobody's pefect :p ) i decided to go green 2y ago with solar panels 9kWc and 2.64kWc for selfuse . This year i installed a 5kWc Wind turbine , an Evance R9000. Selfuse power generated electricity will be later connected to some PW2 when available here.
Actually the mppt table of the Wind turbine is the default provided ( on a ABB power one 6kw inverter uno-dm-6.0-tl-polus-b-g )

inverter (output single phase) :
vmax 600V
Vdc mpp 90/580V
Vdc full power 160/480V

Wind turbine specs can be found on .pdf on internet, i dont find much information or i don t know if it's accurate
http://www.ecoevolution.ie/pdfs/Evance%20R9000.pdf
WIND SPEED (M/S) POWER (W)
2 0
3 22
4 279
5 660
6 1144
7 1755
8 2509
9 3392
10 4205
11 4768
12 5015
13 5015
14 5137
15 5112
rotor diameter 5,5 meter
5Kw output single phase

default mppt table
1 220 0
2 225 200
3 235 300
4 240 400
5 250 500
6 260 600
7 270 675
8 280 750
9 285 820
10 292 918
11 305 1100
12 320 1700
13 330 2100
14 335 2300
15 340 5000
16 400 5000
Pout Ramp 4000
Vin Start 210
Tprot UV 1
Vgrid nom 220

for me as i understood , tprotUV is too low , 1 min before inverter stops and it takes 3 min to go up again
maybe 3600 sec would better ? so i don t miss gusts at low wind speed.
if at 220v it's zero Watt , maybe lower voltage so i can start producing more early ?

edit , one last question , the mmpt table can be scanned regularly , should it be done ? at witch interval ?
thx , regards

[Rob Beckers]

Hi Francois,

I see this used to be the Iskra brand; they were quite respected! Looking through the documentation I can't find anything about the relationship between power vs. Voltage, so I'll use what you published. Another slight complication is that this turbine has an RPM regulator, so the upper part of the power curve doesn't follow the regular 'cube-law'. Looks like the regulator kicks in just above 10 m/s, below that it seems to follow the rules.

Voltage is more or less linear with RPM, and normally RPM is linear with wind speed (until the RPM regulator kicks in), since that keeps the Tip-Speed-Ratio constant (keeping the blades at optimal lift-to-drag angle-of-attack). Power goes with the cube of the wind speed.

Going by the point at 10 m/s, output power should be around 4.2kW, and Voltage seems reasonably to be around 325V DC (if 5kW is 340V). That makes for this relationship for the cube part that looks like this:


Wind (m/s) RMP DC Volt Watt Out
3 69 107 84
3.5 80 124 155
4 92 140 249
4.5 103 157 369
5 115 173 518
6 138 205 916
7 160 236 1466
8 183 266 2193
9 206 296 3120
10 229 324 4272


Things start deviating after that due to the RPM regulator, and easiest is to just add a single point with 340 Volt - 5000 Watt.

Converted to an MPPT table this looks like:


100 Volt - 0 Watt
125 Volt - 150 Watt
160 Volt - 380 Watt
180 Volt - 550 Watt
205 Volt - 920 Watt
270 Volt - 2200 Watt
325 Volt - 4300 Watt
340 Volt - 5000 Watt

Vstart = 100 Volt
Pramp = 5000 Watt/second
Tprot = 300 seconds
Vgridnom = 230 Volt


Please note that all this hinges on the accuracy of that Voltage point at 10 m/s. If that's off, so will the rest of the curve.

Hope this helps!

-RoB-

[RENAULT Francois]

hello and thx for answering
we are far from the default mppt table provided :)
but very near the advertising one ( http://pdf.capenergie.fr/doc-eolienne/Evance-R9000.pdf
)
so maybe i ll change slowly the table and check how it goes, but for sure with the default 220V/0W voltage starts too high as i thought too. this is the first thing i should change at least start at 150V
i ll go home next Week end and check voltage , put an anometer on the mast and wait for Wind :p

thx for help , i ll keep in touch with data i can get

regards,

[Rob Beckers]

If you have an anemometer at or around hub-height you can optimize the MPPT curve yourself to what works best for your turbine. Normally the manufacturer should do this, but many turbine makers are clueless when it comes to MPPT curves.

The way it works is to datalog wind speed and output power (from the inverter). After collecting data for a while, plot this. What you get is the turbine's "power curve" that relates wind speed to output power. What you want is to optimize this curve, so you get the most power out for all wind speeds. The most optimal power curve will result in the most energy produced.

Just change the MPPT curve 20% one direction (more power for the same Voltages), repeat logging and plotting, change 20% in the other direction, and very quickly you will get a sense where things should go to optimize the power curve. The beauty is that the anemometer doesn't even need to be calibrated, as long as it reliably gives the same value for the same wind speed.

This truly is what the manufacturer should be doing before they release a wind turbine. All I can do is go from theoretical values, measuring wind speed and power gives you real information.

Let us know how it goes!

-RoB-

[Rev Maint]

Hi All,

Trying to optamise the MTTP curve for a HY5 - 5Kw Turbine. Currently using a number of systems Ginlong and ABB. Found the following power performance of the original test turbine. How do I calculate the MPPT curev from this?




1.225 kg/m3

24.6 m2


Cat A Cat B Coimbined
Wind Speed Power Cp Data Std Uncertainty Std Uncertainty Uncertainty
m/s kW Sets Si kW Ui Kw uci kW
1 0.5 0.000 0 0 0 0.1299 0.1299
2 1 0.000 0 0 0 0.1299 0.1299
3 1.5 0.000 0 0 0 0.1299 0.1299
4 2 0.000 0 0 0 0.1299 0.1299
5 2.6 -0.040 -0.14 28 0.00186 0.1299 0.1299
6 3 0.000 -0.01 67 0.00316 0.13013 0.13014
7 3.5 0.080 0.131 63 0.00597 0.13029 0.13032
8 4 0.210 0.226 421 0.00986 0.13225 0.13238
9 4.5 0.390 0.28 47 0.01352 0.13538 0.13574
10 5 0.620 0.32 63 0.01115 0.13851 0.13917
11 5.5 0.850 0.337 83 0.01748 0.14697 0.1474
12 6 1.120 0.339 163 0.015052 0.15337 0.15436
13 6.5 1.420 0.342 160 0.01381 0.1588 0.15914
14 7 1.740 0.337 189 0.01614 0.17429 0.17484
15 7.5 2.130 0.334 148 0.01542 0.18118 0.1819
16 8 2.530 0.33 134 0.02375 0.20224 0.20283
17 8.5 2.960 0.319 132 0.03301 0.22041 0.22169
18 9 3.340 0.303 125 0.02832 0.22561 0.22801
19 9.5 3.550 0.273 174 0.05844 0.22044 0.22225
20 10 3.690 0.245 184 0.08038 0.1666 0.17655
21 10.5 3.900 0.223 208 0.08047 0.15361 0.17337
22 11 4.050 0.203 236 0.08188 0.17351 0.19126
23 11.5 4.080 0.178 248 0.08519 0.15918 0.179
24 12 4.140 0.159 218 0.09607 0.13585 0.16035
25 12.5 4.130 0.141 233 0.09241 0.13509 0.16368
26 13 4.180 0.127 218 0.09412 0.13919 0.16802
27 13.5 4.120 0.111 225 0.9782 0.14115 0.17173
28 14 4.270 0.103 194 0.09482 0.1701 0.19474
29 14.5 4.500 0.098 198 0.06944 0.20442 0.21589
30 15 4.500 0.088 184 0.0677 0.1359 0.15183
31 15.5 4.410 0.078 142 0.09638 0.15123 0.17933
32 16 4.680 0.076 126 0.03595 0.25145 0.25401
33 16.5 4.730 0.07 89 0.00726 0.14119 0.14137
34 17 4.690 0.063 80 0.0346 0.14032 0.14452
35 17.5 4.500 0.056 57 0.14263 0.2089 0.25295
36 18 4.370 0.05 45 0.18231 0.17563 0.25314
37 18.5 4.430 0.046 30 0.022592 0.14438 0.26811
38 19 4.770 0.046 17 0.01819 0.35315 0.35362
39 19.6 3.730 0.033 9 0.70594 0.78042 1.05233
40 20 4.310 0.036 15 0.32119 0.68085 0.75284
41 20.5 4.770 0.037 4 0.01725 0.47174 0.47206
42 21.2 4.850 0.034 3 0.02166 0.14688 0.14846
43 21.3 4.750 0.033 1 0 0.56283 0.56283
44 22 0.000 0 0 0 0.1299 0.1299
45 22.3 4.750 0.028 1 0 7.86938 7.86938
46 22.9 4.750 0.026 2 0.051 0.13663 0.14584
47 23.5 0.000 0 0 0 0.1299 0.1299
48 24 0.000 0 0 0 0.1299 0.1299
49 24.5 0.000 0 0 0 0.1299 0.129
50 24.9 4.390 0.019 1 0 5.87084 8.87084

[Rob Beckers]

Rev, I don't follow that table you published... It shows rising wind speed (according to the variable list at the top), but the next one, output power, has lots of entries with zeros.

In any event, you could work from first principles and use the Excel spreadsheet I posted here: https://www.greenpowertalk.org/showthread.php?t=23850
It requires some measurements of the alternator etc. and should give you at least a working MPPT table. Optimizing is matter of putting an anemometer up at hub-height and logging winds speed and output power, and repeating that for small variations in the MPPT curve to find the best power curve.

-RoB-