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As one of the important forms of large-scale energy storage system, battery energy storage has many uses such as peak regulation, valley filling, frequency modulation, phase modulation and emergency backup. Compared with conventional power supplies, large-scale energy storage power stations can adapt to the rapid change of load, which plays an important role in improving the safe and stable operation level of the power system, the quality and reliability of the power grid power supply, and can also optimize the power structure, achieve green environmental protection, achieve the overall energy saving and consumption reduction of the power system, and improve the overall economic benefits. Power Conversion System (PCS) In an electrochemical energy storage system, a device connected to the battery system and the power grid (and/or load) to realize the bidirectional conversion of electric energy, which can control the charging and discharging process of the battery and carry out AC/DC conversion. The AC load can be supplied directly in the case of no grid. PCS is composed of DC/AC bidirectional converter, control unit, etc. The PCS controller receives the background control instructions through communication, and controls the converter to charge or discharge the battery according to the symbol and size of the power instruction, so as to adjust the active power and reactive power of the power grid. At the same time, PCS CAN communicate with BMS through the CAN interface and dry contact transmission to obtain the status information of the battery pack, which can realize the protective charging and discharging of the battery to ensure the safe operation of the battery.
The energy storage bidirectional converter (PCS) is a four-quadrant converter that can control the AC/DC side and realize the AC/DC bidirectional conversion of electric energy. PCS can realize the bidirectional energy transfer between the DC battery of the battery energy storage system and the AC power grid, and realize the charge and discharge management of the battery system, the tracking of the load power at the grid side, the control of the charge and discharge power of the battery energy storage system, and the control of the voltage at the grid side in the off-grid operation mode through the control strategy.
The main function of the Power Conditioning System is that under grid-connected conditions, the energy storage system carries out constant power or constant current control according to the micro-grid monitoring instructions, charges or discharges the battery, and smooths the output of fluctuating power sources such as wind power and solar power. Under the micro-grid condition, the Power Conditioning System serves as the main power supply to provide voltage and frequency support of the micro-grid (V/F control), and the load in the micro-grid works based on this voltage and frequency. PCS adopts double closed-loop control and SPWM pulse modulation method, which can adjust the output voltage, frequency, active and reactive power accurately and quickly.
Modular Design: The PCS boasts a modular design that emphasizes high integration and flexible power configuration.
Compact Size: The system is compact in size, making it suitable for a wide range of application scenarios.
Efficient Photovoltaic Power Generation: Specifically designed for harnessing photovoltaic power generation efficiently, catering to the needs of small to medium-sized micro-grids, as well as industrial and commercial buildings.
Optimal Efficiency and Stability: The PCS ensures optimal efficiency and stability in power conversion.
Adaptable Modular Configuration: The modular design allows for flexible power configuration, enabling customization based on specific requirements.
On/Off Grid Mode Support: Capable of operating in both on-grid and off-grid modes to adapt to different energy setups.
Intelligent Grid Management: Equipped with intelligent grid management features for efficient energy distribution.
Bi-directional Power Conversion System: Offers bi-directional capabilities with both AC/DC and DC/DC conversion functionalities.
Transformer Integration: Incorporates transformers for direct grid connection, enhancing overall system efficiency.
Self-generation and Micro-grid Applications: Designed to facilitate self-generation and micro-grid applications, providing versatility in energy solutions.
11. Compatibility: Compatible with both on-grid and off-grid setups, offering flexibility in deployment.
12. Dual-stage Topology: Features a dual-stage topology with a broad DC input voltage range, enhancing its adaptability.
13. Communication Options: Provides multiple communication options, including RS 485, CAN, and Ethernet, for seamless integration into various systems.
14. PV Interface Integration: Capability to integrate a photovoltaic (PV) interface for hybrid functions, further expanding its application possibilities.
Photovoltaic self-use:The photovoltaic energy is preferentially supplied to the load, and the surplus electricity is stored in the battery. When the photovoltaic energy is insufficient, the energy storage supplies the load.
Microgrid application:The photovoltaic energy is preferentially supplied to the load, and the surplus electricity is stored in the battery. When the photovoltaic energy is insufficient, the energy storage is first used to power the load, and the diesel engine is not enough to power the load.
Backup power supply:When the mains power is off, it automatically switches to off-grid with load to ensure that the load does not lose power. At the same time support off-grid black start, can ensure the emergency load power supply.
Model type | AK-PCS1-50K | AK-PCS1-100K | AK-PCS1-150K | ||
Utility-interactive Mode | |||||
Battery Voltage Range | 600 – 900 V | ||||
Max. DC Current | 110 A | 220 A | 330 A | ||
Max. DC Power | 55 kW | 110 kW | 165 kW | ||
AC Voltage | 400 V +/- 15% | ||||
AC Current | 72 A | 144 A | 216 A | ||
Nominal AC Output Power | 50 kW | 100 kW | 150 kW | ||
AC Frequency | 50 Hz / 60 Hz +/-2.5 Hz | ||||
Output THDi | ≤ 3% | ||||
AC PF | -1 to 1 | ||||
Stand-alone Mode | |||||
Battery Voltage Range | 600 – 900 V | ||||
Max. DC Current | 110 A | 220 A | 330 A | ||
AC Output Voltage | 400 V +/- 10% | ||||
AC Output Current | 72 A (Max. 79 A) | 144 A (Max. 158 A) | 216 A (Max. 237 A) | ||
Nominal AC Output Power | 50 kW | 100 kW | 150 kW | ||
Max. AC Power | 55 kW | 110 kW | 165 kw | ||
Output THDu | ≤ 3% (Linear load) | ||||
AC Frequency | 50 Hz / 60 Hz | ||||
Overload Capability | 110%: 10 min 120%: 1 min | ||||
Physical | |||||
Peak Efficiency | ≥ 97% | ||||
Cooling | Forced Air Cooling | ||||
Noise | ≤ 70 dB | ||||
Enclosure | IP20 (IP54 optional with outdoor cabinet) | ||||
Max. Elevation | 3000 m (> 2000 m derating) | ||||
Operation Ambient Temperature | -20°C – +50°C, derating over 45°C | ||||
Humidity | 5% – 95% non-condensation | ||||
Dimension (H x W x D) | 2100 mm X 800 mm x 1000 mm | ||||
Weight | 700 KGS | 1000 KGS | 1100 KGS | ||
Installation | Vertical Installation | ||||
Other | |||||
Isolation | Built-in Transformer | ||||
Protection | OTP, AC OVP / UVP, OFP / UFP, AC Phase Reverse, Fan/Relay Failure, OLP, GFDI, Anti-islanding | ||||
AC Connection | Grid connected: 3-phase + PE Off-grid: 3-phase + N + PE | ||||
Display | 10.1” Touch Screen | ||||
Support languages | English (other languages upon request) | ||||
Communication | RS 485, CAN, Ethernet |