The three-level linkage control strategy between the battery management system (BMS), energy storage converter (PCS), and energy management system (EMS) in the energy storage system is the key to ensuring efficient and safe operation of the system.

1. Linkage between BMS and PCS: Charge and discharge management

set to 200kW to ensure that the battery will not be damaged due to overcharging.

set to 300kW to meet the demand for fast response during peak hours.

usually maintained between 20% -80% to avoid the impact of deep charging and discharging on battery life.

2. Linkage between BMS and PCS: Temperature Management

For example, 50 degree C, measures should be taken to protect the battery when this temperature is exceeded.

such as 0 degree C, to prevent low temperature from affecting chemical reaction efficiency.

The maximum allowable temperature difference between adjacent batteries is set to 5 degree C, and a warning will be issued if exceeded.

3. Collaborative work of BMS, PCS, and EMS: optimizing scheduling

EMS is responsible for overall energy management and scheduling decisions, and can develop optimal charging and discharging plans based on real-time electricity prices, weather forecasts, and other factors.

4. Security protection mechanism of BMS and PCS

In order to further enhance the security of the system, a multi-layer protection mechanism has been established between BMS and PCS. For example, when BMS detects any abnormal situation (such as short circuit, overvoltage/undervoltage), it will immediately notify PCS to stop the relevant operation and may trigger an emergency disconnect device to cut off the power supply. In addition, there are hardware level protective measures such as fuses and relays to cope with fault isolation in extreme situations.

set to 1.5 times the rated current to prevent damage caused by excessive current.

1. Deep integration with EMS (Energy Management System)

Based on data from BMS, EMS can more accurately predict the trend of battery state changes, thereby better planning charge and discharge plans. For example, arranging charging when electricity prices are low and releasing stored energy during peak hours to earn a price difference. In addition, EMS optimizes long-term energy scheduling strategies by analyzing historical data to ensure maximum economic benefits of the system.

2. Integration of smart home and building automation systems

In addition to simple monitoring functions, smart home systems can also achieve linkage control with BMS/PCS. For example, when no one is detected at home, it automatically enters energy-saving mode to reduce unnecessary power consumption; Before family members return home, turn on high-power appliances such as air conditioning to ensure a comfortable living environment.

3. Role in microgrids

In a typical microgrid environment, in addition to energy storage devices, there are also various distributed power sources such as solar panels and wind turbines. At this point, BMS/PCS not only needs to consider its own working status, but also need to effectively coordinate and cooperate with other power sources to jointly maintain the supply-demand balance within the microgrid. For example, when there is an excess of electricity generated by photovoltaic arrays, PCS chooses to store the excess energy instead of directly feeding it back to the main grid.

4. Support for cloud platforms and big data analysis

With the development of cloud computing technology, more and more enterprises are using cloud platforms for large-scale data processing and model training. For energy storage systems, this means uploading locally collected data to cloud servers, utilizing powerful computing resources to mine and analyze massive amounts of information, and obtaining more refined operational recommendations.