CN-121984232-A - Data interconnection method, energy management system and box transformer measurement and control device

CN121984232ACN 121984232 ACN121984232 ACN 121984232ACN-121984232-A

Abstract

The application discloses a data interconnection method, an energy management system and a box transformer measurement and control device. The method comprises the steps of sending a data request instruction to a box transformer measurement and control device to enable the box transformer measurement and control device to transmit first total power of a low-voltage side of a box to an energy management system, determining a power set value of each energy storage converter according to the first total power, and transmitting the power set value to the corresponding energy storage converter so that the energy storage converters can adjust current power according to the power set value, and accordingly, the total power of the low-voltage side of the box is taken as a regulation reference to calculate and distribute the power set value in a centralized manner, so that multi-PCS load balancing regulation is achieved, the possibility of faults of variable-length expiration carrier operation of the box can be reduced, and energy conversion efficiency can be improved. When a tripping signal of the box transformer measurement and control device is obtained, an emergency stop instruction is sent to the energy storage converter so as to stop the energy storage converter, thereby rapidly cutting off a PCS operation loop when a fault occurs, avoiding further damaging energy storage equipment and improving the safety of the equipment.

Inventors

YANG XUAN
LIU PENG
XIAO RONG

Assignees

广东首航智慧新能源科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1. The data interconnection method is applied to an energy management system, and the energy management system is respectively in communication connection with a box transformer measurement and control device and a plurality of energy storage converters, and is characterized by comprising the following steps: Transmitting a data request instruction to the box transformer substation measurement and control device so that the box transformer substation measurement and control device transmits first total power of a low-voltage side of a box to the energy management system; Determining a power set value of each energy storage converter according to the first total power, and transmitting the power set value to the corresponding energy storage converter so that the energy storage converter can adjust the current power according to the power set value; when a tripping signal of the box transformer measurement and control device is obtained, an emergency shutdown instruction is sent to the energy storage converter so as to shutdown the energy storage converter.
2. The method of claim 1, wherein determining a power setting for each of the energy storage converters based on the first total power and transmitting the power setting to the corresponding energy storage converter to cause the energy storage converter to adjust a current power based on the power setting comprises: calculating the product of the safety coefficient and the rated power of the box transformer as a safety power threshold; And when the first total power is greater than a safe power threshold, determining the power set value of each energy storage converter according to the safe power threshold so that the sum of the powers of the energy storage converters is smaller than or equal to the safe power threshold.
3. The method of claim 1, wherein upon acquisition of a trip signal of the tank transformer measurement and control device, sending an emergency shutdown command to the energy storage converter to shutdown the energy storage converter, comprising: acquiring state data of the box transformer measurement and control device in a polling mode; Generating an emergency stop instruction when a tripping signal is acquired based on the state data; broadcasting the emergency shutdown command to all the energy storage converters in parallel with the highest priority, so that the energy storage converters respond to the emergency shutdown command to shutdown, and feeding back confirmation information to the energy management system; And generating an event log according to the confirmation information when the confirmation information is received.
4. The method according to claim 1, wherein the method further comprises: When receiving a power-off signal of the box transformer measurement and control device, controlling an energy storage converter to start as a host, so that the host outputs stable micro-grid voltage and frequency reference; issuing a brake-separating instruction to the box transformer measurement and control device so as to enable the box transformer measurement and control device to control a breaker of a box transformer to be brake-separated; and controlling the rest energy storage converters to be started as slaves, and synchronizing to the micro-grid voltage and the frequency reference so as to form a micro-grid power supply end with the master machine to supply power to a load.
5. The method of claim 1, wherein the energy management system is further coupled to an external device through an industrial firewall, the method further comprising: when the communication data is connected with external equipment, the communication data of the external equipment is filtered through the industrial firewall based on the minimum authority principle, wherein the communication data comprises at least one of a communication address, a communication port and a function code.
6. The method according to claim 1, wherein the method further comprises: Sending a first temperature instruction to the box transformer measurement and control device to acquire the winding temperature of the box transformer through the box transformer measurement and control device; sending a second temperature instruction to the energy storage converter so as to obtain the temperature of the power tube through the energy storage converter; Calculating the daily rate of change of the temperature of the box transformer winding according to the winding temperatures at different times; And when the daily change rate exceeds a preset threshold value and lasts for a preset time, if the temperature of the power tube of at least one energy storage converter is abnormally increased synchronously, generating early warning information, wherein the early warning information is used for prompting to check a public heat dissipation channel or environmental factors.
7. The utility model provides a data interconnection method, is applied to case change measurement and control device, case change measurement and control device and energy management system communication connection, energy management system still with a plurality of energy storage converters communication connection, its characterized in that, the method includes: Acquiring total power data of a low-voltage side of the box in real time; Transmitting the total power data to the energy management system in response to a data request instruction sent by the energy management system, so that the energy management system determines a power set value of each energy storage converter according to the total power data; when an abnormal state of the box transformer is detected, the circuit breaker of the box transformer is controlled to trip, and a tripping signal is reported to the energy management system, so that the energy management system sends an emergency shutdown instruction to the energy storage converter according to the tripping signal, wherein the abnormal state comprises at least one of overvoltage, overcurrent, short circuit and island.
8. The method of claim 7, wherein the method further comprises: when the power failure of the power grid is detected, a power failure signal is sent to the energy management system, so that the energy management system issues a brake-off instruction; and responding to a brake opening instruction of the energy management system, and controlling a breaker of a box transformer to open so as to physically isolate the power grid from the energy storage converter.
9. An energy management system, comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.
10. The utility model provides a case becomes measurement and control device which characterized in that includes: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of claim 7 or 8.

Description

Data interconnection method, energy management system and box transformer measurement and control device Technical Field The application relates to the technical field of energy storage, in particular to a data interconnection method, an energy management system and a box transformer measurement and control device. Background A tank transformer is an indispensable key node for an energy storage system, which is capable of raising the voltage to be incorporated into a high voltage power grid when the energy storage is partially discharged, and lowering the voltage to adapt to the charging demand of the energy storage device, etc. when the power grid charges the energy storage system. However, the traditional energy storage system generally adopts a framework combining the box transformer and the discrete PCS, a large number of cables are needed to be connected, a real-time data interaction and cooperative control mechanism is often lacking between the box transformer and the PCS in a software layer, and real-time interconnection and intercommunication are also lacking, so that the box transformer is easy to run in a long-term overload mode, the response speed of the system is low, fault isolation is not timely, and the overall safety of the system is easily affected when abnormal conditions occur. Disclosure of Invention The application aims to provide a system for solving the technical problem of low safety caused by the lack of real-time interconnection of the existing energy storage system. In a first aspect, the application provides a data interconnection method, which is applied to an energy management system, wherein the energy management system is respectively in communication connection with a box transformer measurement and control device and a plurality of energy storage converters; the method comprises the steps of determining a power set value of each energy storage converter according to the first total power, transmitting the power set value to the corresponding energy storage converter so that the energy storage converter can adjust the current power according to the power set value, and sending an emergency shutdown instruction to the energy storage converter when a tripping signal of the box transformer measurement and control device is obtained so that the energy storage converter is stopped. In some embodiments, determining a power set value of each energy storage converter according to the first total power, and transmitting the power set value to the corresponding energy storage converter so that the energy storage converter adjusts current power according to the power set value, wherein the method comprises the steps of calculating the product of a safety coefficient and a rated power of a box transformer as a safety power threshold, and determining the power set value of each energy storage converter according to the safety power threshold when the first total power is larger than the safety power threshold so that the sum of the powers of the energy storage converters is smaller than or equal to the safety power threshold. In some embodiments, when a tripping signal of the box-type substation measurement and control device is acquired, an emergency shutdown instruction is sent to the energy storage converter to shutdown the energy storage converter, the method comprises the steps of acquiring state data of the box-type substation measurement and control device in a polling mode, generating the emergency shutdown instruction when the tripping signal is acquired based on the state data, broadcasting the emergency shutdown instruction to all the energy storage converters in parallel with the highest priority, enabling the energy storage converter to shutdown in response to the emergency shutdown instruction, feeding back confirmation information to the energy management system, and generating an event log according to the confirmation information when the confirmation information is received. In some embodiments, the method further comprises the steps of controlling one energy storage converter to be started as a host computer when a power-down signal of the box transformer measurement and control device is received, enabling the host computer to output stable micro-grid voltage and frequency reference, sending a switching-off instruction to the box transformer measurement and control device, enabling the box transformer measurement and control device to control a circuit breaker of a box transformer to switch off, controlling other energy storage converters to be started as slaves, and synchronizing to the micro-grid voltage and the frequency reference, so that a micro-grid power supply end is formed with the host computer to supply power for a load. In some embodiments, the energy management system is further connected to an external device through an industrial firewall, and the method further comprises filtering communication data of the external device through the industrial firewal