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10 PCS Functions
10.1 Operation Mode
10.1.1 Basic Functions
On-grid Operation
The PCS is designed with perfect on-grid operation function and can flexibly adapt to differ-
ent batteries to control charging and discharging. Charging/discharging mode and charging/
discharging instruction are set through the PC or on the user interface. The specific opera-
tion modes are as follows:
On-grid constant power (AC), on-grid constant power (DC), on-grid constant voltage, and
on-grid constant current are set according to dispatch instructions and available in both
charging and discharging states. The on-grid operation mode can well adapt to scenarios
such as peak shaving, frequency regulation, peak load shifting, smooth grid connection of
new energy, and the like.
It is recommended that the input voltage of the DC battery of two PCS units sharing
a transformer in the MV system be controlled within 100V, and excessive voltage
difference will affect the performance of the parallel system.
It is recommended that the power dispatching mode of two PCS units sharing a
transformer in the MV system should be consistent, the charge and discharge
modes should be consistent, and the active mode or reactive mode should be con-
sistent. Mixing of charging and discharging, active and reactive power is
prohibited.
Independent Inversion (VF)
The PCS can implement black start in the off-grid state through the independent inversion
function (VF), and can provide AC voltage source with stable voltage amplitude and fre-
quency to support the load. Independent inversion voltage instruction and frequency instruc-
tion are set through the PC or on user interface.
The independent inversion function can provide power supply to keep the system stable in
remote area, island, commercial micro grid, and other scenarios. In addition, the PCS can
be used as a standby power source to ensure power supply on important occasions or for
important device.
VSG Function
The VSG function includes on-grid operation and off-grid operation. In normal on-grid opera-
tion, the PCS can regulate the grid-connected active power and reactive power by activating
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