SOFAR 250KTL-HV Grid Tied Inverter User Manual

SOFAR 250KTL-HV Grid Tied Inverter

Specifications:

• Model: SOFAR 250KTL-HV
• Reactive Power Modes: 6 different modes
• Adjustable Range of Power Factor PF: 0.8 to 1, -1 to -0.8
• Adjustable Range of Reactive Power Percentage: -100% to 100%

Product Usage Instructions

Reactive Mode I: Reactive Power Regulation Through Fixed Power Factor
The inverter calculates reactive power based on the current active power and the fixed power factor set within the range of 0.8 to 1 or -1 to -0.8.

Reactive Mode II: Reactive Power Regulation Through Fixed
Reactive Power Percentage
In this mode, set a fixed reactive power percentage within the range of -100% to 100%. The system will calculate the power factor angle and corresponding reactive power based on the set percentage and current active power.

Reactive Mode III: Reactive Power Following Active Power Changes
The inverter adjusts reactive power according to the power factor corresponding to the set active power level. As active power changes, reactive power also changes accordingly.

Parameter Explanation:

Note:

This mode has a voltage entry enable bit. Ensure to set the lockinv voltage percentage and lockoutv voltage percentage for proper operation based on grid voltage levels.

FAQ:

1. Q: How do I switch between different reactive power modes?
   A: You can switch between reactive power modes using the SOFAR Cloud APP or other official SOFAR APP.

2. Q: What happens if the grid voltage percentage is less than the lockoutv voltage percentage?
   A: In such a case, the reactive power output will be set to 0.

Introduction
The inverter can support the grid by providing reactive power in 6 different modes by using SOFAR Cloud APP or other SOFAR official APP.
The reactive mode from 1 to 4 are for installation personnel, 5 to 6 are for professionals or engineers.
Take the PV inverter of SOFAR 250KTL-HV for example.

Reactive mode I: reactive power regulation through fixed power factor

The adjustable range of power factor PF is 0.8 to 1, -1 to -0.8. After the fixed power factor is set, the reactive power is calculated according to the current active power.

The shaded part of the figure below shows the reactive power calculated from the fixed power factor and active power:

Below is the operation interface of the APP.

Reactive mode II: reactive power regulation through fixed reactive power

percentage

The adjustable range of reactive power percentage is -100% to 100%. In this mode, set a fixed reactive power percentage, and the system will calculate the power factor angle according to the set reactive power percentage, and then calculate the corresponding reactive power according to the current active power.
For example, the rated active power of sofar 250ktl-hv is 250KW. If the reactive power percentage is set to 40%, the reactive power output is 250 * 40%= 100kvar.
Below is the operation interface of the APP.

Reactive mode 3: the reactive power of inverter will follow the change of

active power

By setting the four level active power load reduction point, the reactive power is calculated according to the power factor corresponding to the set active power. When the active power changes, the corresponding reactive power also changes. The corresponding relationship between active power and power factor is shown in the figure:

Note: this mode has a voltage entry enable bit. If it is enabled, it is necessary to set the lockinv voltage percentage and lockoutv voltage percentage. When the grid voltage percentage is greater than the lockinv voltage percentage, this mode is normally enabled; When the grid voltage percentage is less than the lockoutv voltage percentage, the reactive power is 0.
Below is the operation interface of the APP.

Reactive mode 4: inverter reactive power continuously changes with grid

voltage

The reactive power is adjusted by setting the high-voltage starting point, high-voltage ending point, low-voltage starting point and low-voltage ending point of the grid voltage, in which the grid voltage changes continuously. The following figure shows the relationship between reactive power and grid voltage:

Optional
P2| P2 on the Q (U) mode curve is the starting voltage point of low voltage| Optional
P3| P3 on the Q (U) mode curve is the starting voltage point of low voltage| Optional
P4| P4 on the Q (U) mode curve is the starting voltage point of low voltage| Optional

Note: this mode has a voltage entry enable bit. If it is enabled, it is necessary to set the lockinv voltage percentage and lockoutv voltage percentage. When the grid voltage percentage is greater than the lockinv voltage percentage, this mode is normally enabled; When the grid voltage percentage is less than the lockoutv voltage percentage, the reactive power is 0. (response waiting time during detection can be set)
Among them, the reactive power at point P1 is the maximum lagging reactive power, the reactive power at point P2 is the reactive power at the low voltage starting voltage point, the reactive power at point P3 is the reactive power at the high voltage starting voltage point, and the reactive power at point P4 is the maximum leading reactive power.
Below is the operation interface of the APP.

Reactive mode 5: inverter reactive power continuously changes with grid

voltage

The reactive power is adjusted by setting the high-voltage starting point, high-voltage ending point, low-voltage starting point and low-voltage ending point of the grid voltage, in which the grid voltage changes step by step. The following figure shows the relationship between reactive power and grid voltage:

Optional
P2| P2 on the Q (U) mode curve is the starting voltage point of low voltage| Optional
P3| P3 on the Q (U) mode curve is the starting voltage point of low voltage| Optional
P4| P4 on the Q (U) mode curve is the starting voltage point of low voltage| Optional

Note: this mode has a voltage entry enable bit. If it is enabled, it is necessary to set the lockinv voltage percentage and lockoutv voltage percentage. When the grid voltage percentage is greater than the lockinv voltage percentage, this mode is normally enabled; When the grid voltage percentage is less than the lockoutv voltage percentage, the reactive power is 0. (response waiting time during detection can be set)
Among them, the reactive power corresponding to P1 and P4 points is the maximum reactive power point. (both can be set by self selection)
Below is the operation interface of the APP.

Reactive mode 6: the inverter calculates the current output reactive

power through constant apparent power

That is, when the active power does not reach the rated value, the reactive power is calculated according to the rated apparent power, and the calculation formula is; When the active power reaches the rated value, the reactive power is 0.
Note: phase type can be set: 1 Zero reactive power: reactive power is 0; 2. lagging reactive power: reactive power is negative; 3. leading reactive power: the reactive power is positive.
Below is the operation interface of the APP.

Download APP
https://www.sofarsolar.com/cloud.html

References

• SOFAR Cloud

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