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• The PCS responds to VSG mode instructions only in the stop state, not the
standby state. The condition under which the PCS can operate normally is that
the protection function works well, and the battery voltage falls within the speci-
fied range.
• During on-grid operation in the VSG mode, set the output voltage set value to
be consistent with the grid voltage, and set the output frequency set value to
be consistent with the grid frequency! Enable the VSG mode after setting the
running parameters.
• During on-grid operation in the VSG mode, it is specified that positive active
power set value indicates that the PCS generates active power, negative value
indicates that the PCS absorbs active power, positive reactive power set value
indicates that the PCS generates capacitive reactive power, and the negative
reactive power indicates that the PCS generative inductive reactive power.
• During on-grid operation in the VSG mode, when the grid frequency is the
same as the output frequency set value, the on-grid active power is equal to
the set secondary frequency modulation value; and when the grid voltage is
the same as the output voltage set vale, the on-grid reactive power is equal to
the reactive power set value. During actual on-grid operation, the fluctuation of
grid frequency and voltage will cause on-grid frequency fluctuation within a
reasonable range, which is normal.
Mode Switching
In the on-grid mode, the PCS can directly switch between charging state and discharging
state without a middle transition state.
10.2 L/HVRT(UL)
The Electric Rule 21, 2015 defines the L/HVRT requirements according to the figure and ta-
ble below.
System Manual 10 PCS Functions
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