Growatt SPH 4000-10000TL3 BH-UP handleiding

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Handleiding

Figure 6.9 shows the three-phase system with unbalanced loads. The inverter side can

provide enough power to the load (power provided by the inverter side is not less than

4+1+2=7 kW), and not every phase can provide enough power to the load (the load power

of one phase exceeds 3.3 kW). The total value of the inverter output power is not greater

than the sum of the total load power and the preconfigured exported power (4+1+2+1=8

kW). At this time, the three-phase output of the inverter side is unbalanced; the three-

phase power of the grid side is unbalanced, and it is allowed to draw power from or feed

power to the grid.

Figure 6.9

Although the inverter side can provide sufficient power (> 7kW), each phase output of the

inverter with a rating of 10 kW is at most 3.3 kW, and the R phase also needs to draw 0.7

kW from the grid. The other two phases can export at most 0.33 kW to the grid

respectively. In conclusion, the total power output provided by the inverter is 6.9 kW.

Note:

1kW

4kW

3.3kW

1.3kW

-0.3kW

2.3kW

6.9kW

0.1kW

2kW

-0.3kW

0.7kW

is unbalanced; the threephase power of the grid side is unbalanced, and it is allowed to

draw power from or feed power to the grid.

Figure 6.10 shows the three-phase system with unbalanced loads. The inverter side

cannot provide enough power to the load (power provided by the inverter side is less than

1+2+3=6 kW). The total value of the inverter output power is not greater than the sum of

the total load power and the preconfigured exported power (1+2+3+1=7 kW). At this

time, the three-phase output of the inverter side

Figure 6.10

6.4.3 Limited feed-in power percentage can be set in Czech

The limited feed-in power configured in percentage under the grid code of Czech limits

the total power fed to the grid from all three phases. After prioritizing the power supply to

loads, each phase will export as much power as possible while fulfilling the export

limitation requirement. The power fed to the grid is counted as negative value.

For an inverter with a maximum output power of 10 kW, if the percentage of exported

power is set to 10%, after prioritizing the power supply to loads, the inverter will export

power to the grid with the R>S>T priority until no excess power is present or the algebraic

sum of the power fed to the grid (in blue) is -1kW. If the exported power is about to go

over the limit value (-1 kW), the inverter will reduce the output power in the order of T, S,

and R to stop this tendency.

1kW

2kW

1.3kW

1.6kW

1.4kW

1.6kW

4.5kW

1.5kW

3kW

0.4kW

-0.3kW

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