Settings on the HMI

To set the real time clock

• Manually
  - the PCS will NOT start until started manually or remotely.
• Auto start after powered
  - the PCS will start after powered up.

there are 2 options

• AC dispatch
• String dispatch
• DC dispatch

refer to DC dispatch and AC dispatch for more information

In most applications, select AC dispatch.

For multi-string models, select String dispatch.

rarely, DC dispatch is supposed to be selected.

This menu contains all parameters that affects the performance of the AC side of the PCS. Note that depending on the mode selected, the AC side parameters may not take effect, or may not be settable

there are 3 modes supported in regulating reactive power

• Constant reactive power
  - the reactive power will be designated by reactive power setpoint directly
• Constant PF
  - the reactive power will be designated by PF setpoint and active power setpoint
• Volt-VAr
  - the reactive power will be designated by the grid voltage, following the curve made by several Volt-VAr (V,Q) points

This setpoint will take effect ONLY when Reactive power regulation mode is set to Constant PF

To regulate the importing and exporting active power of the PCS, MUST be the most important setpoint in PCS

This setpoint will take effect ONLY when Reactive power regulation mode is set to Constant reactive power

If Power change mode is set to ramp, in normal operation, the power setpoint changes, the actual import/export power will slowly change with this slope setpoint.

Upon starting to inject power into the grid, following a period of inactivity or a disconnection, the inverter will be able to control its rate of increase of power from 1 to 100% maximum current per second.

This setpoint will tune the off-grid voltage within the range of ±10% of the the rated AC voltage.

there are 3 modes supported in regulating active power

• Constant active power
  - the active power will be designated by the active power setpoint directly
• Freq-Watt
  - the active power will be designated by the active power setpoint when frequency is in normal range, once the frequency rises beyond the range, the active power will reduce with the Freq-Watt slope
• Volt-Watt
  - the active power will be designated by the active power setpoint when voltage is in normal range, once the voltage rises beyond the range, the active power will reduce with the Volt-Watt slope
• Freq-Watt and Volt-Watt
  - the active power will be designated by the active power setpoint when both frequency or voltage is in normal range, once the voltage or frequency rises beyond the range, the active power will reduce with the Frequency-Watt and Volt-Watt slope, but frequency will be priory.

there are 2 modes

• Step
  - the power will change instantly when setpoint is changed
• Ramp
  - the power will change linearly with the normal ramp rate when setpoint is changed

F/VRT (Frequency Ride-through and Voltage Ride-through) Enabling

By enabling this option, the anti-islanding function will be activated

There are 2 options

• Step
  - the PCS will generate the AC voltage instantly when it's started
• Soft-Start
  - when it's started, the PCS will close AC relays, and then generate the AC voltage slowly, to avoid potential inrush current

This menu contains all parameters that affects the performance of the DC side of the PCS. Note that depending on the mode selected, the DC side parameters may not take effect, or may not be settable

The Sinexcel PCS are classed with different types

• Standard one string, which has only one DC string
• Multi-string, which has multiple DC strings, mostly one module is connected to one battery string

We call each string subsystem.

there are 2 modes in this option

• Constant power
  the PCS will import/export designated DC power, ignoring the AC power setpoints
• Constant current
  the PCS will import/export designated DC current if SOC supports, ignoring the AC power setpoints

both of the two options take effect ONLY when Energy dispatching mode is set to DC dispatch

The PCS will import/export the power at DC side, according to this setpoint This setpoint takes effect ONLY when Energy dispatching mode is set to DC dispatch, and DC operation mode is set to Constant current

The PCS will import/export the power at DC side, according to this setpoint This setpoint takes effect ONLY when Energy dispatching mode is set to DC dispatch, and DC operation mode is set to Constant power

This is the secondary under-voltage criterion. If the voltage reaches this threshold, it's critical for the ESS. the EMS must consider charging the battery at this moment.

Usually this threshold should be set 5~10V lower than end of discharge voltage

A legacy setpoint for lead-acid battery. If you are using lithium-ion battery, this setpoint MUST be the same as topping charge voltage

refer to this article

The battery charging current (DC) will never be more than this threshold

The battery discharging current (DC) will never be more than this threshold

if the PCS is discharging, once the voltage reaches this criteria, the PCS will stop and refuse to discharge.

A legacy setpoint for lead-acid battery. If you are using lithium-ion battery, ignore this option

Another legacy setpoint for lead-acid battery. If you are using lithium-ion battery, ignore this option

When the battery is charged nearly full, the current will reduce. Once the current drops to this threshold, the PCS will stop charging the battery.