The energy storage power station of this project has a scale of 4MW/8MWh, a charge and discharge rate of 0.5C, and a charge and discharge efficiency of 92%. It adopts a daily "two-charge and two-discharge" charge and discharge strategy, charging during low electricity price periods and discharging during high electricity price periods. The transformer capacity meets the energy storage charging needs, and the factory load is stable and can fully absorb the energy storage discharge. The energy storage power station fully charges the battery system during the off-peak period from 23:00 to 07:00 the next day, and then discharges for 2 hours during the peak period from 13:00 to 15:00, and then fully charges the battery again during the flat period from 15:00 to 20:00, and then discharges for 2 hours during the peak period from 20:00 to 22:00, realizing a single-day two-charge and two-discharge profit model that cooperates with "low-peak" and "flat-peak". Based on time-of-use electricity price data and the efficiency of energy storage power stations, it can be calculated that the daily arbitrage income in normal months can reach 11,280 yuan, and the daily arbitrage income in peak electricity consumption months can reach 12,640 yuan, and the annual income can reach more than 4 million yuan.
4. Achievements in energy storage power station construction
After the energy storage power station of this project was completed and put into operation, it brought the following results:
(1) Energy storage power stations store electricity when electricity demand is low and release it when electricity demand is high, thus achieving efficient use of energy. By building and operating energy storage power stations, energy waste can be reduced and energy efficiency of cement plants can be improved. (2) Energy storage power stations can store electricity when electricity supply exceeds demand and release stored energy when electricity supply is insufficient, thereby balancing the supply and demand of electricity and improving the stability of energy consumption in cement plants. (3) Energy storage power stations enhance the risk resistance of cement plant power grids. When the external power grid fails or a sudden natural disaster causes a power outage in the factory, the energy storage power station can be used as an emergency backup power source, quickly put into use and provide a stable power supply, thereby improving the safety of the factory power grid. (4) When the load power consumption of the cement plant is at its peak, the energy storage power station can replace part of the transformer capacity, reduce the overall capacity demand of the factory, and thus achieve the purpose of reducing capacity electricity charges.
5.Acrel-2000ES Energy Storage Cabinet Energy Management System
5.1 System Overview
Acrel-2000ES, an energy storage EMS specially developed for industrial and commercial energy storage cabinets and energy storage containers, has complete energy storage monitoring and management functions, covering detailed information of energy storage system equipment (PCS, BMS, electric meters, fire protection, air conditioning, etc.), and realizes data collection, data processing, data storage, data query and analysis, visual monitoring, alarm management, statistical reports and other functions. It supports energy scheduling in advanced applications, and has control functions such as planning curves, peak shaving and valley filling, demand control, and backflow prevention.
5.2 System Structure
Acrel-2000ES can connect the equipment inside the energy storage cabinet or energy storage container to the system through direct purchase or communication management or serial port server. The system structure is as follows:
5.3 System Functions
5.3.1 Real-time monitoring
The system has a friendly human-machine interface, which can display the operating status of the energy storage cabinet, monitor PCS, BMS and environmental parameter information in real time, such as electrical parameters, temperature, humidity, etc. It can also display relevant information such as faults, alarms, and benefits in real time.
5.3.2 Equipment Monitoring
The system can monitor the operating status and operation mode of PCS, BMS, electric meters, air conditioners, fire protection, dehumidifiers and other equipment in real time.
PCS monitoring: meet the parameter and limit settings of the energy storage converter; set the operation mode; collect and display the voltage, current, power and charge and discharge parameters of the AC and DC sides of the energy storage converter; and monitor the PCS communication status, start and stop status, switch status, abnormal alarm and other status.
BMS monitoring: Meet the parameters and limit settings of the battery management system; monitor the temperature, voltage, and current of the battery cells and battery clusters of the energy storage battery; and provide alarms for abnormal battery charging and discharging status, voltage, current, and temperature.
Air conditioning monitoring: To meet the needs of ambient temperature monitoring, the air conditioning temperature can be adjusted in linkage according to the set threshold, and the operating status and temperature and humidity data of the air conditioner can be monitored in real time and displayed in the form of a curve.
UPS monitoring: Meet the requirements of UPS operating status and related electrical parameter monitoring.
5.3.3 Curve Report
The system can query and display PCS charging and discharging power curves, SOC conversion curves, and historical curves such as voltage, current, and temperature.
5.3.4 Policy Configuration
Meet the configuration of energy storage system equipment parameters, the setting of electricity price parameters and time periods, and the selection of control strategies. Currently supported control strategies include planning curves, peak shaving and valley filling, demand control, etc. 5.3.5 Real-time alarm
The energy storage management system has a real-time alarm function. The system can issue alarms for events such as energy storage charging and discharging exceeding limits, temperature exceeding limits, equipment failure or communication failure.
5.3.6 Event Query Statistics
The energy storage management system can store and manage records of remote signal changes, temperature and humidity, voltage over-limit and other events, making it convenient for users to trace the history of system events and alarms, query statistics and conduct accident analysis.
5.3.7 Remote control operation
The red button under each device can be used to control the PCS, fan, dehumidifier, air conditioning controller, lighting and other equipment accordingly, but when the device is not communicating, the control button will show an invalid status.
5.3.8 User Rights Management
The energy storage energy management system has set up a user rights management function to ensure the safe and stable operation of the system. User rights management can prevent unauthorized operations (such as remote control operations, database modifications, etc.). You can define the login names, passwords and operating permissions of users of different levels to provide reliable security for system operation, maintenance and management.
6. Hardware selection list for related platform deployment
|
equipment |
model |
picture |
illustrate |
|
Energy storage and energy management system |
Acrel-2000ES |
|
Realize data collection and monitoring of energy storage equipment, statistical analysis, abnormal alarm, optimization control, data forwarding, etc.; Strategic control: planning curve, demand control, peak shaving and valley filling, backup power supply, etc. |
|
Touch screen computer |
PPX-133L |
|
1) Undertake system software 2) Visual display: display system operation information |
|
AC Meter |
DTSD1352 |
|
Integrates power parameters and energy measurement and assessment management, and provides various types of energy data statistics. It has harmonic and total harmonic content detection, with switch input and switch output to realize "remote signal" and "remote control" functions, and has alarm output. With RS485 communication interface, MODBUS-RTU or DL/T645 protocol can be selected. |
|
DC Meter |
DJSF1352 |
|
The meter can measure the voltage, current, power, and forward and reverse electric energy in the DC system; it has an infrared communication interface and an RS-485 communication interface, and supports Modbus-RTU protocol and DLT645 protocol; it can have relay alarm output and switch input functions. |
|
Temperature online monitoring device |
ARTM-8 |
|
It is suitable for multi-channel temperature measurement and control, and supports 8-channel temperature measurement; each channel temperature measurement corresponds to 2-stage alarm, and the relay output can set the alarm direction and alarm value arbitrarily. |
|
Communication management machine |
ANet-2E8S1 |
|
It can collect and summarize data from water meters, gas meters, electricity meters, microcomputer protection and other equipment terminals according to different collection protocols; provide multiple functions such as protocol conversion, transparent forwarding, data encryption and compression, data conversion, edge computing, etc.; real-time multi-task parallel processing of data collection and data forwarding, and can send data to the platform through multiple links. |
|
Serial Device Server |
Aport |
|
Function: Convert the status data of the "auxiliary system" and feed it back to the energy management system. 1) Switch the air conditioner on and off, adjust the temperature, and completely cut off the power (realized by the secondary switch); 2) Upload the circuit breaker signals of each distribution cabinet; 3) Upload the internal power information of the UPS; 4) Connect to the electric meter, BSMU and other equipment Reference address：A brief discussion on the application of energy storage power stations in cement plants
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