Installation of guide rails for dual DC energy meters connected to 1500V energy storage power stations

The necessity of DC side metering in energy storage power plants:

The DC side metering of energy storage power stations is a key link in ensuring the safe, efficient, and economical operation of power stations. Its necessity is reflected in multiple dimensions, which not only relates to the daily operation and maintenance of power stations, but also affects power grid coordination, cost accounting, and policy compliance.

1、 Ensure the safe operation of the battery system

Real time monitoring of battery statusThe charging and discharging process of energy storage batteries (such as lithium batteries) is mainly completed on the DC side, and abnormal parameters such as voltage, current, and power may indicate the risk of overcharging, overdischarging, short circuit, or thermal runaway of the battery. DC side metering can capture these parameters in real time, providing data support for BMS (Battery Management System), triggering protection mechanisms in a timely manner (such as cutting off circuits), and avoiding safety accidents.

Accurately evaluate the health of batteriesBy accumulating the charging and discharging power on the DC side and combining it with time dimension data, the actual capacity degradation rate (SOH) of the battery can be calculated to determine whether the battery is aging or needs to be replaced, and to avoid safety hazards caused by battery performance degradation in advance.

2、 Improve the operational efficiency of energy storage systems

• Optimize charging and discharging strategiesThe DC side measurement data can reflect the actual charging and discharging efficiency of the battery (such as energy loss), and can dynamically adjust the charging and discharging plan based on the fluctuation of peak and valley electricity prices or new energy generation in the power grid. For example, when the DC side detects low charging efficiency, it can pause charging and investigate the cause (such as excessive line loss) to reduce ineffective energy consumption.

• Reduce system lossesThe DC side of the energy storage system includes devices such as battery packs, combiner boxes, DC/DC converters, etc. The measurement data can locate high loss links (such as abnormal internal resistance of a certain group of batteries), providing a basis for equipment maintenance or upgrading and improving overall energy conversion efficiency.

3、 Supporting grid coordination and scheduling

• Realize precise matching of "source storage load"When the energy storage power station is linked with new energy generation systems such as photovoltaic and wind power, the DC side metering can directly obtain real-time interactive data of new energy DC output and energy storage charging and discharging, helping the power grid dispatch center determine whether the energy storage consumes new energy electricity as needed (such as smoothing wind and solar power curtailment), or whether it discharges to the power grid according to instructions (such as peak shaving).

• Meet the response requirements of the power grid for energy storageSome power grids require energy storage stations to have millisecond level response capabilities (such as frequency regulation), and high-frequency data measured on the DC side (such as 10ms/time) can quickly feedback the actual output of energy storage, ensuring that its response speed and accuracy meet grid standards.

Ankrui provides solutions for DC side metering of energy storage power plants:

DJSF1352-RN-6 is launched by Ankerui ElectricInstallation of guide rails for dual DC energy meters connected to 1500V energy storage power stationsIt has dual DC inputs and is mainly designed for applications such as telecommunications base stations, DC charging stations, solar photovoltaics, etc. It can measure voltage, current, power, and forward and reverse electrical energy in DC systems

Model Description

Technical Specifications

Installation of guide rails for dual DC energy meters connected to 1500V energy storage power stationsThe specific introduction is as follows:

• Main functions：

• High precision measurementThe power accuracy can reach up to level 0.5, and the overload capacity can reach up to 120% (maximum), which can accurately measure the relevant parameters of the DC system. It also supports time-sharing electricity statistics, which can accurately track peak electricity consumption and provide a basis for electricity cost management and energy efficiency optimization.

• Intelligent diagnosis and protectionMonitor abnormal states such as overvoltage, undervoltage, and overcurrent through register addresses. Once an abnormality is triggered, optional relays will quickly alarm and output to ensure system safety. In addition, it can also store 16 sets of relay action logs, making it convenient for operation and maintenance personnel to quickly locate the source of the fault.

• Data recording and viewingOne click view of the maximum/minimum values and occurrence time of voltage, current, and power, supporting instantaneous freezing (3 times) and timed freezing (12 times) of energy data, with multiple rate statistics function, can query total energy, hourly energy (peak and valley), and historical months.

• Technical Specifications：

• Voltage and current inputVoltage coverage of 0-1500V, current support for shunt (0-75mV) or Hall sensor (0-5V) connection.

• communication protocolRS485 communication supports mainstream protocols such as Modbus RTU and DLT645, making it easy to connect to energy management systems.

• Operating TemperatureThe working temperature range is -25 ℃~+65 ℃, which can cope with harsh outdoor environments.

• Power SpecificationsThe power supply is AC/DC 85-265V or DC24V or DC 48V (P1).

• Overall dimensionsThe size is 94mm × 71mm × 72mm, and it is installed using DIN standard rails. The wiring terminals are clearly labeled with dual input/output, communication, and switch interfaces, and support "plug and play".