3.4 Micro Grid
The D-A period is the battery charging period during which discharging is
not allowed and the PV will charge the battery rst for peak shaving. The
ChargeFromGrid" setting determines whether or not to charge from the
grid. When "ChargeFromGrid" is set to "Disable", the battery cannot
charge from the grid; when "ChargeFromGrid" is set to "Enable" and the
actual battery SOC is less than “Max_SOC”, the battery will charge from the
grid at no more than "ChargePowerLimits" power.
In the A-B and C-D periods, if the power of loads does not exceed
"PeakLimits”, the PV will charge the battery rst.When the battery is fully
charged, the PV will charge loads, and the surplus power will feed into the
grid. If the power of loads exceeds "PeakLimits”, the PV and battery will
discharge energy for loads and thus reduce the amount of energy
purchased from the grid.
In the B-C period, the battery does not discharge. The PV will charge the
battery to the "Reserved SOC" rst and then supply power or loads, with
the surplus power feeding into the grid. Charging the battery rst in these
peiods is storing energy for the peak shaving.
1. Strictly follow the above wiring diagram.
2. Enable: “Settings" d ” "Advance settings" "MicroGrid .
→
→
Grid
EPS
Battery
Breaker
Breaker
Breaker
RCD
RCD
CT
CT
Main Breaker
Loads
N-BAR for loads
Off-grid loads
N-BAR for off-grid loads
N-BAR
Hybrid inverter
On-grid inverter
Introduction
Conguration
IntroductionIntroduction
Grid
18
19
Peak shaving mode is set for leaving out peaks in electricity use.
Peak shaving mode
* If there are requirements for zero output from the inverter, the PV output will be
limited.
Before Peak Shaving
After Peak Shaving
BESS discharging into network
BESS charging from baseload
generating plant
Time of day
0
6 am
midday
6 pm
midnight
Baseload
Mid merit
Peaking
generation
Load demand/MW
D
A
BESS charging from
baseload generating
plant
BESS discharging
into network
B
C
generation
There are a large number of traditional on-grid inverters on the market.
Due to Islanding Effect, on-grid inverters are unable to work during off-
grid. This feature makes users lose the on-grid inverter PV energy when
off-grid.
Micro-grid is function that mak hybrid inverter simulat the grid to a es e
active on-grid inverter during off-grid. By connecting on-grid inverter
to the EPS port of hybrid inverter, inverter able to use PV or hybrid is
battery energy to active on-grid inverter when utility lost.
generation