China Nebula 630 kW Energe-storage Converter (NEPCS-6301000-E101) manufacturer and supplier

Nebula 630 kW Energe-storage Converter (NEPCS-6301000-E101)

In the energy storage system, the energy-storage converter is a device connected between the battery system and the power grid (and/or load) to realize bi-directional conversion of electricity, which can control the charge/discharge process of the energy storage battery, convert AC and DC, and supply power directly to the AC load in the absence of the power grid.

It can be applied to the power generation, transmission and distribution side, and user side of the power storage system. It is mainly applied in renewable energy stations such as wind, solar power stations, transmission and distribution stations, industrial and commercial energy storage, distributed micro-grid energy storage, PV-based electric vehicle charging stations, etc.

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Functional Description

In an energy storage system, an intelligent converter (or energy storage converter) is a device for bidirectionally converting electrical energy between a battery system and a power grid (and/or load) can control the charging and discharging process of the battery. For AC-DC conversion, it can directly supply AC load without grid.
Energy storage converters are widely used in electric power systems, rail transportation, military, shore-based, petroleum machinery, new energy vehicles, wind power generation, solar photovoltaic and other fields, to achieve bi-directional flow of energy in grid peak shaving and valley filling, smoothing power fluctuations, energy recycling, backup power, grid connections for renewable energy etc, to actively support the grid voltage and frequency and improve the quality of power supply.
It can be applied to the energy storage system on the power generation side, the transmission and distribution side of the power grid and the user side of the power system, mainly applied to renewable energy wind and solar PV hybrid power systems, transmission and distribution stations, industrial and commercial energy storage and distributed micro-grid energy storage, storage and charging stations etc.
Strong grid adaptability, high power quality and low harmonics; bi-directional charge and discharge management of the battery for extending battery life; with battery algorithms to charge the battery in an efficient and safe way; wide DC voltage range for diverse battery charging applications; three-level topologies technology for efficient energy conversion with conversion rate up to 97.5%; low standby power consumption and low no-load losses; active grid protection, with fault monitoring and protection functions; real-time monitoring for operating status and rapid fault location; support multiple converter units parallel connection to meet high power level requirements; with grid-connected and off-grid operation, supporting intelligent automatic switch for grid-connected and off-grid mode; front maintenance and easy installation, adaptable to various application sites.

Applicable Range

It can be applied to the energy storage system on the power generation side, the transmission and distribution side of the power grid and the user side of the power system, mainly applied to renewable energy wind and solar PV hybrid power systems, transmission and distribution stations, industrial and commercial energy storage and distributed micro-grid energy storage, storage and charging stations etc.

Model Description

Appearance

Applicable range

Model description

Features

Strong grid adaptability:
High power quality and low harmonics;
Anti-islanding and islanding operation, support for high/low/zero voltage ride-through, rapid power dispatching.
Comprehensive battery management:
Bi-directional charge and discharge management of the battery for extending battery life.
With battery algorithms to charge the battery in an efficient and safe way;
Wide DC voltage range for diverse battery charging applications.
Multiple operation modes, with pre-charge, constant current /voltage charging, constant power charging and discharging, constant current discharging etc.
Superior conversion efficiency:
Three-level topologies technology for efficient energy conversion with conversion rate up to 97.5%;
1.1times long-term overload operation, providing stronger grid support for overall operations in terms of both efficiency and reliability.
Low standby power consumption and low no-load losses.
Safety and reliability:
Active grid protection, with fault monitoring and protection functions.
Real-time monitoring for operating status and rapid fault location.
Strong compatibility:
Supporting multiple grid dispatching for active and reactive power compensation.
Support multiple converter units parallel connection to meet high power level requirements.
With grid-connected and off-grid operation, supporting intelligent automatic switch for grid-connected and off-grid mode.
Front maintenance and easy installation, adaptable to various application sites.

Main function
1)Basic control function
Grid-connected control of constant power charging and discharging;
Grid-connected constant voltage and constant current charging;
Off-grid V/F control:
Reactive power compensation regulation control;
On-grid /off-grid smooth switching control;
Anti-islanding protection function and islanding detection for mode switching;
Fault ride-through control;
2) Descriptions for specific function are as follows:
Energy storage battery charging and discharging control: The energy storage converter can charge and discharge the battery. The charging power and discharging power are for selections. The various modes of charging and discharging commands are modified by the touch screen or the host computer.
Charging modes include constant current charging (DC), constant voltage charging (DC), constant power charging (DC), constant power charging (AC), etc.
Discharge modes include constant current discharging (DC), constant voltage discharging (DC), constant power discharging (DC), constant power discharging (AC), etc.
Reactive power control: Energy storage converters provide control for power factor and reactive power ratio. The control of power factor and reactive power ratio should be achieved by injecting reactive power.
This function of converter can be realized when performing both charging and discharging operations. The reactive power setting is performed by the host computer or touch screen.
Output voltage and frequency stability: Energy storage converters can adjust output voltage and frequency stabilization in grid-connected systems by controlling reactive power and active power. To realize this function, a large-scale energy storage plant is required.
Independent inverter control for isolated grid: The energy storage converter has independent inverter function in the isolated grid system, which can stabilize the output voltage and frequency and supply power to various loads.
Independent inverter parallel control: In larger scale applications, the independent inverter parallel function of energy storage converters increases the redundancy and reliability of the system. Multiple converter units can be connected in parallel.
Note: Independent inverter parallel connection is an additional function. The energy storage converter switches seamlessly between grid-connected and independent inverter, requiring an external static switching switch.
Failure warning of key devices: Early warning of usage status and failure indication of key devices of energy storage converters to improve product intelligence.

3.Status switching
When the converter is powered up into initial shutdown, the control system will complete a self-check to verify the integrity of the control and sensor systems. The touch screen and DSP start up normally and the converter enters a shutdown state. During shutdown, the energy storage converter blocks the IGBT pulses and disconnects the AC/DC contactors. When in standby, the energy storage converter blocks the IGBT pulses but closes the AC/DC contactors and the converter is in hot standby.
● Shutdown
The energy storage converter is in shutdown mode when no operation commands or scheduling received.
In shutdown mode, the converter receives a operation command from the touch screen or the upper computer and transfers from shutdown mode to operating mode when the operation conditions are met. In operation mode, the converter goes from operation mode to shutdown mode if a shutdown command is received.
● Standby
In standby or operating mode, the converter receives a standby command from the touch screen or the upper computer and enters to standby mode. In standby mode, the AC and DC contactor of the converter keep closed, the converter enters operating mode if a operation command or scheduling received.
● Running
The operation modes can be divided into two operating modes: (1) off-grid operation mode and (2) grid-connected operation mode. The grid-connected mode can be used to perform charging and discharging. In grid-connected mode, the converter is capable of performing power quality regulation and reactive power control. In off-grid mode, the converter can provide a stable voltage and frequency output to the load.
● Fault
When the machine malfunctions or the external conditions are not within the machine's permissible operating range, the converter will stop operating; disconnect the AC and DC contactors immediately so that the main circuit of the machine is disconnected from the battery, grid or load, at which point it enters a fault state. The machine enters a fault state when the power has been removed and the fault has been cleared.
3.Operating mode
The operation modes of the converter can be divided into two operating modes: (1) off-grid operation mode and (2) grid-connected operation mode.
• Grid-connected mode
In grid-connected mode, the converter can perform charging and discharging functions.
Charging includes constant current charging (DC), constant voltage charging (DC), constant power charging (DC), constant power charging (AC), etc.
Discharging includes constant current discharging (DC), constant voltage discharging (DC), constant power discharging (DC), constant power discharging (AC), etc.
• Off-grid mode
In off-grid mode, the batteries are discharged to provide a constant voltage and frequency AC power supply rated at 250kVA to the load. In microgrid systems, the batteries can be charged if the power generated by the external generator is greater than the power consumed by the load.
• Mode switching
In grid-connected mode, the switching between the charging and discharging of the energy storage converter can be carried out directly, without the need to enter standby state.
Switching between charging and discharging mode and independent inverter mode is not possible in the presence of the grid. Note: Except for seamless switching mode.
There must be no presence of grid for the independent inverter to operate. Note: Except for parallel operation.
4.Basic protection function
The intelligent converter has a sophisticated protection function, when the input voltage or grid exception occurs, it can effectively act to protect the safe operation of the intelligent converter until the exception resolved and then continue to generate electricity. Protection items include.
• Battery polarity reversal protection
• DC over-voltage/under-voltage protection
• DC over-current
• Grid side over/under-voltage protection
• Grid side over current protection
• Grid side over/under frequency protection
• IGBT module fault protection：IGBT module over-current protection，IGBT module over-temperature
• Transformer/ Inductor over-temperature protection
• Lighting protection
• Unplanned island protection
• Ambient over-temperature protection
• Phase failure protection (wrong phase sequence, phase loss)
• AC voltage unbalance protection
• Fan failure protection
• AC, DC side main contactor failure protection
• AD sampling failure protection
• Inner short circuit protection
• DC component over-high protection

Contact information
Company: Fujian Nebula Electronics Co., Ltd
Address: Nebula Industrial Park, No.6, Shishi Road, Mawei FTA, Fuzhou, Fujian, China
Mail: info@e-nebula.com
Telephone: +86-591-28328897
Fax: +86-591-28328898
Website: www.e-nebula.com
Kunshan Branch: 11th Floor, Building 7, Xiangyu Cross-Strait Trade Center, 1588 Chuangye Road, Kunshan City
Dongguan Branch: No. 1605, Building 1, F district, Dongguan Tian’an Digital Mall, No.1 Gold Road, Hongfu Community, Nancheng Street, Dongguan City
Tianjin Branch: 4-1-101, Huading Zhidi, No.1, Haitai Huake Third Road, Xiqing Binhai High-tech Industrial Zone, Tianjin City
Beijing Branch: 408, 2nd Floor East, 1st to 4th Floor, No.11 Shangdi Information Road, Haidian District, Beijing City