The technology of energy storage system mainly includes the bidirectional inverter for energy storage, the management of energy storage batteries, and the reasonable scheduling of system energy by monitoring and scheduling management units.

1. Battery management system

The Battery Management System (BMS) is installed inside the energy storage battery pack, responsible for collecting voltage, temperature, current, capacity and other information, real-time status monitoring and fault analysis of the energy storage battery pack. At the same time, it communicates online with PCS and monitoring and scheduling systems through CAN bus to achieve optimized charging and discharging management control of the battery pack. Each cluster of battery packs in the system is equipped with a battery management system, which can effectively and efficiently use each cluster of energy storage batteries and achieve overall rational allocation.

BMS has functions such as battery voltage balancing, battery pack protection, thermal management, and analysis and diagnosis of battery performance. It is required to be able to measure the voltage, charging and discharging current, temperature, and terminal voltage of the battery module in real time, and calculate the internal resistance of the battery. By analyzing the diagnostic model, the diagnosis of the current or remaining capacity (SOC) of the single battery, the diagnosis of the healthy state (SOH) of the single battery, the evaluation of the battery pack status, and the estimation of the sustainable discharge time in the current state during discharge can be obtained.

2. Monitoring and scheduling management system

The monitoring and scheduling management system is the energy scheduling and management center of the energy storage unit, including the central control system (MGCC) and energy management system (EMS). It is responsible for collecting all battery management system data, energy storage converter data, and distribution cabinet data, issuing control commands to various parts, controlling the operation of the entire energy storage system, and arranging the work of the energy storage converter reasonably; The system can automatically operate according to the preset charging and discharging time, power, and operating mode, and can also accept real-time instructions from the operator.

Among them, the energy management system is the neural control system of the energy storage system. In order to achieve reasonable energy scheduling, according to the characteristics of peak and valley levels in the power grid, it realizes the economic operation of the microgrid, and has functions such as operation optimization, load prediction, power generation prediction, micro source scheduling, and power flow control.

Battery energy storage systems are the trend of the development of the new energy industry in the next five years, with a predicted market size of several trillion yuan both domestically and internationally. Currently, the construction of energy storage power stations is in full swing both domestically and internationally. With nearly 20 years of research and development and service level in photovoltaic power products, Guanlong Power has a rich range of integrated capabilities in the development, design, construction, operation and maintenance of photovoltaic and energy storage power stations. It is a professional enterprise engaged in the research and development, production, and sales of photovoltaic inverters, photovoltaic controllers, and energy storage inverters, as well as the investment, development, construction, and service of photovoltaic power stations and energy storage power stations. In terms of energy storage, we have already taken the forefront of the industry and believe that we will occupy a place in the energy storage market.