CN110880811B - Communication device and method for battery energy storage power station - Google Patents

Abstract

The invention discloses a communication device and a method for a battery energy storage power station, which comprise station control layer equipment, spacer layer equipment and energy storage unit layer equipment.

Description

A battery energy storage power station communication device and method

Technical Field

The present invention relates to the field of power control, and in particular to a communication device and method for a battery energy storage power station.

Background technique

With the rapid development of new energy technologies, the necessity of energy storage technology application has been widely recognized in the industry in order to solve the stability and friendliness of new energy high penetration grid access. The future development trend of energy interconnection and energy complementarity provides a broad application space for energy storage technology. Energy storage has become the key in the process of developing renewable clean energy.

Battery energy storage power stations have become an important measure to solve the problems of new energy consumption, peak load regulation and frequency regulation in power systems due to their short construction period and rapid response. As a key link in command transmission, the communication architecture of the energy storage station plays a decisive role in the performance of the entire station. In order to ensure the safe and stable operation of battery energy storage power stations, it is an urgent issue to formulate a scientific system communication solution to make the data transmission within the station real-time and reliable.

Summary of the invention

In order to solve the technical problem that there is currently no scientific system communication solution for battery energy storage power stations, resulting in delays and instability in data transmission within the station, the present invention provides a reliable battery energy storage power station communication device and method.

In order to achieve the above technical purpose, the technical solution of the present invention is:

A communication device for a battery energy storage power station comprises a station control layer device, an interval layer device and an energy storage unit layer device, wherein the station control layer device is connected to the energy storage unit layer device via the interval layer device communication, the station control layer device comprises a station control layer switch, and a monitoring host, a data communication gateway and a network security monitoring device mutually connected in parallel to the station control layer switch; the interval layer device comprises an interval layer switch, and a public measurement and control device, a 10kV optical differential protection measurement and control device, a station transformer protection measurement and control device, an anti-islanding protection device and a frequency and voltage emergency control device mutually connected in parallel to the interval layer switch; the energy storage unit layer device comprises an energy storage unit layer switch, and a converter secondary system, a battery management system and an on-site monitoring system mutually connected in parallel to the energy storage unit layer switch.

The battery energy storage power station communication device, the station control layer equipment also includes a printer and a historical data server connected in parallel to the station control layer switch.

The battery energy storage power station communication device described above, the station control layer equipment also includes a synchronization time system, the synchronization time system is connected to the station control layer switch, and obtains time information through the GPS system and the Beidou satellite system.

In the communication device of the battery energy storage power station, the spacer layer equipment is directly connected to the monitoring host by a network cable, and the IEC61850 communication protocol is adopted; the converter secondary system and the battery management system are directly connected to the monitoring host by a network cable, and the IEC61850 communication protocol is adopted; the converter secondary system is directly connected to the battery management system by a shielded twisted pair cable, and the Modbus communication protocol is adopted, and a pair of hard contacts are connected at the same time; the converter secondary system is directly connected to the local monitoring system by a dual network cable, and the IEC61850 communication protocol is adopted; the battery management system is directly connected to the local monitoring by a network cable, and the Modbus communication protocol is adopted.

In the battery energy storage power station communication device, the station control layer switch, the bay layer switch and the energy storage unit layer switch all include at least two independent switch networks.

A battery energy storage power station communication method, using the battery energy storage power station communication device, comprises the following steps:

The data of the interval layer equipment is directly connected to the station control layer switch, the data of the energy storage unit layer equipment is collected by the interval layer switch and then connected to the station control layer switch, the inverter secondary system data is sent to the monitoring host and the local monitoring system respectively in concurrent mode, the battery management system sends all the data to the local monitoring system, and sends the pre-set important data in the data to the monitoring host at the same time, the battery management system uses shielded twisted pair cables to transmit protection control parameters to the inverter secondary system, and uses hard contacts to send shutdown commands to the inverter secondary system.

In the battery energy storage power station communication method, when a network disconnection failure occurs, the response steps include:

When the converter secondary system detects a network interruption with the monitoring host, it immediately takes shutdown measures;

When the monitoring host detects that the network with the battery management system is disconnected, it will send a shutdown command to the energy storage converter corresponding to the battery management system after a certain delay;

When the battery management system detects that the communication with the converter secondary system is interrupted, it immediately sends a shutdown command to the converter secondary system through a hard contact.

The technical effect of the present invention is that, by combining the three-layer two-network architecture of the current substation, a networking method, communication protocol, data transmission strategy, and network disconnection response strategy suitable for the battery energy storage power station are proposed, which can effectively ensure the communication reliability, real-time performance, and operational safety of the battery energy storage power station.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a diagram of the battery energy storage power station communication solution architecture.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in Figure 1, the implementation method of the method provided by the present invention is described based on the common equipment configuration of the current battery energy storage power station. The equipment of the battery energy storage power station is logically divided into station control layer equipment, spacer layer equipment and energy storage unit layer equipment.

The station control layer equipment includes a monitoring host, a historical data server, a data communication gateway machine in zone I, a printer, a network security monitoring device, etc. The bay layer equipment includes a bay layer switch, a public measurement and control device, a 10kV optical differential protection measurement and control device, a station transformer protection measurement and control device, an anti-islanding protection device, and a frequency and voltage emergency control device. The energy storage unit layer equipment includes an energy storage unit layer switch, a converter secondary system, a battery management system, and an on-site monitoring system. The station control layer equipment is connected to the energy storage unit layer equipment through the bay layer equipment communication. The station control layer equipment includes a station control layer switch, and a monitoring host, a data communication gateway machine, and a network security monitoring device connected in parallel to the station control layer switch; the bay layer equipment includes a bay layer switch, and a public measurement and control device, a 10kV optical differential protection measurement and control device, a station transformer protection measurement and control device, an anti-islanding protection device, and a frequency and voltage emergency control device connected in parallel to the bay layer switch; the energy storage unit layer equipment includes an energy storage unit layer switch, and a converter secondary system, a battery management system, and an on-site monitoring system connected in parallel to the energy storage unit layer switch.

In order to ensure the security of the communication network, the station control layer switch, the bay layer switch and the energy storage unit layer switch each include at least two independent switch networks to form a redundant switch network, and each device is respectively connected to each independent switch network.

The spacer layer equipment is connected to the monitoring host with dual network cables, using the IEC61850 communication protocol; the inverter secondary system is connected to the monitoring host, and the battery management system is connected to the monitoring host with dual network cables, using the IEC61850 communication protocol; the inverter secondary system is connected to the battery management system with a shielded twisted pair, using the Modbus communication protocol, and a pair of hard contacts are connected at the same time; the inverter secondary system is connected to the local monitoring system with dual network cables, using the IEC61850 communication protocol, and the battery management system is connected to the local monitoring with a network cable, using the Modbus communication protocol. The switches are connected with dual optical cables to ensure sufficient transmission capacity.

Combined with the data transmission requirements between devices, and taking into account the real-time, reliability and system security of communication, the data transmission strategy is formulated as follows: the data of the measurement, control and protection device at the interval layer is directly connected to the station control layer switch, the data of the energy storage unit layer equipment is collected by the interval layer switch and then connected to the station control layer switch, the converter secondary system data is sent to the monitoring host and the local monitoring system respectively in concurrent mode, the battery management system sends all data to the local monitoring system, and sends some important data to the monitoring host, the battery management system uses shielded twisted pair cables to transmit protection control parameters to the converter secondary system, and uses hard contacts to send shutdown commands to the converter secondary system.

Since the failure of communication equipment may cause communication interruption between devices, in order to ensure the equipment safety of the energy storage power station, the system's network disconnection response strategy is formulated as follows: when the converter secondary system detects that the network with the monitoring host is disconnected, it immediately takes shutdown measures; when the monitoring host detects that the network with the battery management system is disconnected, it sends a shutdown command to the PCS corresponding to the battery management system after a certain delay; when the battery management system detects that the communication with the converter secondary system is interrupted, it immediately sends a shutdown command to the converter secondary system through a hard contact.

It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A battery energy storage power station communication device, characterized in that it includes a station control layer device, an interval layer device and an energy storage unit layer device, wherein the station control layer device is connected to the energy storage unit layer device through the interval layer device communication, and the station control layer device includes a station control layer switch, and a monitoring host, a data communication gateway and a network security monitoring device connected in parallel to the station control layer switch; the interval layer device includes an interval layer switch, and a public measurement and control device, a 10kV optical differential protection measurement and control device, a station transformer protection measurement and control device, an anti-islanding protection device and a frequency and voltage emergency control device connected in parallel to the interval layer switch; the energy storage unit layer device includes an energy storage unit layer switch, and a converter secondary system, a battery management system and an on-site monitoring system connected in parallel to the energy storage unit layer switch; The station control layer switch, the bay layer switch and the energy storage unit layer switch each include at least two independent switch networks; The described spacer layer equipment is also directly connected to the monitoring host by a network cable, using the IEC61850 communication protocol; the described converter secondary system and battery management system are also directly connected to the monitoring host by a network cable, using the IEC61850 communication protocol; the described converter secondary system is also directly connected to the battery management system by a shielded twisted pair cable, using the Modbus communication protocol, and at the same time connected to a pair of hard contacts; the described converter secondary system is also directly connected to the local monitoring system by a dual network cable, using the IEC61850 communication protocol; the battery management system is also directly connected to the local monitoring by a network cable, using the Modbus communication protocol. 2. A battery energy storage power station communication device according to claim 1, characterized in that the station control layer equipment also includes a printer and a historical data server connected in parallel to the station control layer switch. 3. A battery energy storage power station communication device according to claim 1, characterized in that the station control layer equipment also includes a synchronization time system, the synchronization time system is connected to the station control layer switch, and obtains time information through the GPS system and the Beidou satellite system. 4. A battery energy storage power station communication method, characterized in that a battery energy storage power station communication device according to any one of claims 1 to 3 is used, comprising the following steps: The data of the interval layer equipment is directly connected to the station control layer switch, the data of the energy storage unit layer equipment is collected by the interval layer switch and then connected to the station control layer switch, the inverter secondary system data is sent to the monitoring host and the local monitoring system respectively in concurrent mode, the battery management system sends all the data to the local monitoring system, and sends the pre-set important data in the data to the monitoring host at the same time, the battery management system uses shielded twisted pair cables to transmit protection control parameters to the inverter secondary system, and uses hard contacts to send shutdown commands to the inverter secondary system. 5. A battery energy storage power station communication method according to claim 4, characterized in that when a network disconnection failure occurs, the response step comprises: When the converter secondary system detects a network interruption with the monitoring host, it immediately takes shutdown measures; When the monitoring host detects that the network with the battery management system is disconnected, it will send a shutdown command to the energy storage converter corresponding to the battery management system after a certain delay; When the battery management system detects that the communication with the converter secondary system is interrupted, it immediately sends a shutdown command to the converter secondary system through a hard contact.