Photovoltaic and energy storage integrated monitoring and operation and maintenance solutions

d) Operation information: power conversion system protection action signal, accident alarm signal, etc.

Figure 18 Acrel-2000MG and AcrelEMS power conversion system data acquisition

1. Monitoring and alarming

The monitoring function of the monitoring system shall comply with but not be limited to the following requirements:

a) The operating parameters and equipment status of the main electrical equipment should be monitored through the display;

b) It should be able to monitor and display the communication status and communication messages of each device in real time;

c) The remote measurement and alarm quantity uploaded by the battery management system and power conversion system to the monitoring system must have a dedicated interface display and alarm

Figure 19 Acrel-2000MG and AcrelEMS monitoring and alarm classification

1. Control and regulation

Control scope: AC circuit breakers, power conversion systems and other related important equipment in the station, including power conversion system start/stop, operation/maintenance status switching, grid-connected charging/discharging, off-grid discharge, protection soft pressure plate switching, etc. The monitoring system supports the following application modes according to its functional positioning: peak shaving and valley filling, isolated grid operation, system frequency regulation, voltage support, power quality management, smooth power output, and tracking planned output.

Figure 19 Acrel-2000MG and AcrelEMS energy storage system monitoring

1. Power quality monitoring

Monitor the voltage fluctuation and flicker, three-phase voltage imbalance, voltage swell/sag, short-term interruption, harmonic distortion and other operating conditions of the energy storage system AC circuit, record events and fault waveforms in real time, and provide data sources for power quality analysis and management.

Figure 20 Acrel-2000MG and AcrelEMS power quality analysis

1. Enterprise Microgrid Energy Efficiency Management

In addition to providing monitoring and alarms for energy storage systems, the AcrelEMS enterprise microgrid energy efficiency management platform is also an integrated management platform for the source, grid, load, storage, charging, and operation and maintenance within the enterprise. It provides comprehensive monitoring, optimization control, equipment management, operation and maintenance management, analysis reports, etc. for the energy efficiency management of enterprise microgrids, and provides data services and abnormal alarms based on WEB and APP.

The platform can provide enterprises with microgrid operation data based on their photovoltaic power generation data, energy storage control strategies, and load fluctuations, and formulate electricity optimization plans to help enterprises reduce electricity costs and promote clean energy consumption while improving the safety of microgrid operation.

Figure 21 AcrelEMS Enterprise Microgrid Energy Efficiency Management Platform

• 1. Selection of secondary equipment for monitoring and operation management system of electrochemical energy storage power station

Ankerui provides electrochemical energy storage power station monitoring and operation management software, data gateways and protection measurement and control units, multi-function instruments and related sensors, and is equipped with power quality monitoring and management devices to ensure the efficient operation of energy storage power stations and enterprise microgrids.

Table 3 Selection of energy storage power station monitoring and operation management system

1. Conclusion

Driven by the dual carbon goals and grid operation safety requirements, photovoltaic power generation and supporting energy storage systems will receive more and more policy support in the future. It is conceivable that more and more capital investment will promote the rapid development of the industry in the future, thereby improving the safety of grid operation and improving the efficiency of electricity use. However, the operation safety of microgrid systems, especially photovoltaic power stations and energy storage power stations, cannot be ignored. It is necessary to strictly follow the standards and establish a photovoltaic and energy storage monitoring and operation management system to monitor, warn, control and operate photovoltaic power stations and energy storage systems to ensure safe production.

In the future new power systems, the interaction within the enterprise's photovoltaic storage and charging microgrid and between the enterprise's microgrid and the large power grid will become more and more frequent. This requires a unified platform to monitor and manage the enterprise's "source-grid-load-storage-charging" and operation and maintenance in a unified manner. Only in this way can the efficient operation of the enterprise's microgrid be guaranteed, thereby promoting the new power system to move towards a stable, reliable, and low-carbon virtuous cycle.