Overview
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2.4 Product features
High conversion efficiency：Advanced 3-level conversion technology; Max.
discharge efficiency: 98%, Max. charge efficiency: 97%;
Flexible grid support capabilities: 2 selectable grid standards; adjustable
reactive power: ±0.8, remote curtailment;
Flexible communication: Supports standard Modbus (RTU, TCP, ASCII) and
CANbus (extended frame, data frame) communications to ensure compatibility
with 3
rd
party monitoring and control systems;
Wide DC input voltage range ： Operating DC input voltage range: 875-
1500Vdc; Max DC input voltage: 1500V.
Charge and discharge: The PCS can charge/discharge the batteries from/to
the grid.
Outdoor rating: NEMA Type 4X protection degree meets outdoor application;
Grid-tied/off-grid capability: Support grid-tied and off-grid switching. If the off-
grid mode is set in the auto-switch mode, when the power grid has failed, the
PCS will be automatically switched from grid-tied to off-grid mode.
2.5 Protection functions
Reverse-polarity protection of DC input
Short circuit protection
AC output voltage and frequency monitoring
AC insulation resistance monitoring
Monitoring of DC injection into AC output
Anti-islanding protection
Input and output over-voltage protection
Input over-current protection
Environmental temperature monitoring
Battery temperature monitoring
LVRT (Low-voltage ride-through) and HVRT (High-voltage ride-through)
2.6 Circuit structure design
Basic schematic diagram of the PCS is shown below. The input of the batteries
passes through contactors and pre-charge circuit. The output of the PCS converts
the DC voltage to 3-phase AC voltage. An output filter is employed to remove the
high-frequency harmonics and reduce THD (Total Harmonic Distortion). Then the 3-
phase AC voltage is passed through two-stage relays and EMI wave filter to produce
high quality AC power.
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