CN110488199B - Alarm response method for battery system of high-capacity battery energy storage power station - Google Patents
Alarm response method for battery system of high-capacity battery energy storage power station Download PDFInfo
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Abstract
本发明提供了一种大容量电池储能电站电池系统告警响应方法，在优化EMS、PCS和BMS通讯机制的基础上，有机的通过双路甚至三路冗余告警响应通道，实现EMS和PCS对告警信号的分级快速处理，通过多样化的通讯路径，使得储能电站能量管理系统和储能变流系统同步做出相应的动作效果，在促使告警信号得到可靠响应的基础上，确保储能电站能量管理系统、储能变流系统和电池管理系统的状态同步及安全稳定运行。
The invention provides an alarm response method for a battery system of a large-capacity battery energy storage power station. On the basis of optimizing the communication mechanism of EMS, PCS and BMS, the two-way or even three-way redundant alarm response channels are used to realize the EMS and PCS. The hierarchical and fast processing of alarm signals enables the energy management system of the energy storage power station and the energy storage conversion system to perform corresponding actions synchronously through diversified communication paths. The state synchronization and safe and stable operation of the energy management system, energy storage converter system and battery management system.
Description
Technical Field
The invention relates to the technical field of high-capacity battery energy storage power stations, in particular to a high-reliability warning response method for a battery system of a high-capacity battery energy storage power station.
Background
The energy storage system has the capability of time-space migration of power and energy, is an effective measure for solving the inherent problems of intermittent new energy power output fluctuation, intermittence and the like, and is rapidly developed along with the wide popularization and application of new energy technologies such as wind power generation, photovoltaic power generation and the like. Compared with energy storage modes such as a flywheel, pumped storage, compressed air, a super capacitor and the like, the battery energy storage power station has the advantages of high energy storage density, flexible site selection, convenience in installation, capability of running smoothly and stably in four quadrants and the like, and has a small construction scale at both the power supply side and the load side in the domestic wide construction stage. The power grid side battery energy storage power station has the functions of participating in peak clipping and valley filling, frequency adjustment, reactive power support, emergency control and the like of a power grid, and the flexibility, stability, economy and cleanliness of system operation can be effectively improved after large-scale construction.
At present, an energy storage carrier of a power grid side battery energy storage power station is mainly a lithium iron phosphate battery, and the capacity and the voltage of a battery monomer are small. The battery energy storage power station on the power grid side is often large in capacity, and comprises a large number of battery monomers above megawatt level. The single batteries sequentially pass through a battery pack, a battery cluster and a battery stack in a serial-parallel connection mode to form an energy storage system in a step-by-step integration mode. In recent years, battery energy storage power stations have better development situations, but also face a severe safety situation, lithium ion batteries have inherent fire problems in principle, and severe events that the energy storage power stations fire and affect the operation of a power grid occur in China, the United states, Korea and other countries. In order to improve the safe and stable operation level of the battery system of the energy storage power station and the energy storage station, a complete, reliable and effective battery system alarm response mechanism needs to be constructed urgently.
The battery energy storage power station adopts a PWM rectification technology and has higher response speed. On the basis of optimizing EMS, PCS and BMS communication mechanisms, rapid processing of alarm signals by the EMS and the PCS is realized through two-way or even three-way redundant alarm response channels, real-time on-line reliable monitoring and isolation of battery system faults can be realized, and the operation safety of the battery system and the energy storage power station is improved.
Disclosure of Invention
Based on the problems, the invention discloses a battery system alarm response method for a high-capacity battery energy storage power station, and the battery energy storage power station adopts a PWM (pulse-width modulation) rectification technology and has higher response speed. On the basis of optimizing EMS, PCS and BMS communication mechanisms, the alarm signals are organically and rapidly processed in a grading mode through two-way or even three-way redundant alarm response channels, the energy management system and the energy storage converter system of the energy storage power station synchronously make corresponding action effects through diversified communication paths, and on the basis of promoting the alarm signals to be reliably responded, the state synchronization and safe and stable operation of the energy management system, the energy storage converter system and the battery management system of the energy storage power station are ensured.
According to one aspect of the invention, the invention provides a high-capacity battery energy storage power station battery system alarm response method, which comprises the following steps:
step 1: the method comprises the following steps of constructing perfect communication among an EMS, a PCS and a BMS, carrying out IEC61850 communication among the EMS, the PCS and the BMS, and carrying out Modbus and hard-wired communication among the PCS and the BMS in parallel and redundantly so as to ensure reliable uploading of BMS alarm information;
step 2: establishing a BMS three-level alarm and response mechanism, monitoring the running state of the battery system in real time, and immediately sending a signal to the EMS and the PCS by the BMS when an alarm occurs;
the step 2 specifically comprises:
step 2-1: dividing the state signals of the battery system in the battery compartment into three levels according to the severity, determining the alarm action values of the three levels of the state of each battery system, and ensuring the reliable action and return of the alarm signals of each level;
step 2-2: establishing a BMS alarm signal response mechanism in an EMS system: reducing the operating power of the corresponding energy storage converter when only one level of alarm signal of the state of any battery system is received; when a primary alarm signal and a secondary alarm signal of a certain battery system state are received, a command is issued to stop the corresponding energy storage converter; when receiving a first-level alarm signal, a second-level alarm signal and a third-level alarm signal of a certain battery system state, sending an instruction to enable a corresponding energy storage converter to trip, wherein the trip refers to the PCS shutdown and simultaneously tripping a PCS AC/DC side circuit breaker;
step 2-3: establishing a BMS alarm signal response mechanism in a PCS system, reducing the operating power of a corresponding energy storage converter when only one battery system state primary alarm signal is received, stopping the corresponding energy storage converter by a command when one battery system state primary and secondary alarm signals are received, and tripping the corresponding energy storage converter by a command when one battery system state primary, secondary and tertiary alarm signals are received;
step 2-4: the BMS system of each battery compartment monitors the state of the battery system in the compartment in real time, and when monitoring the alarm signal, the BMS and the PCS system are reported through IEC61850 and Modbus protocol at the same time, and if monitoring the three-level alarm signal, the BMS system sends the alarm signal to the PCS through a hard contact;
and step 3: after receiving the alarm signal sent by BMS, EMS and PCS act synchronously according to established strategy to ensure that BMS alarm signal can still be executed reliably after any communication loop is in fault.
Further, the battery system state signal of step 2-1 includes a voltage, a current, a temperature and/or an insulation signal.
Further, the step 1 comprises:
step 1-1: establishing Ethernet connection between the EMS and the BMS, and uploading BMS states and alarm signals of all levels to the EMS system; for BMS manufacturers without IEC61850 protocol communication functions, a communication protocol conversion device is added on the BMS system side;
step 1-2: establishing Ethernet connection between the EMS and the PCS to realize that an EMS control instruction is issued to the PCS; for PCS manufacturers without IEC61850 protocol communication functions, a communication protocol conversion device is added on a PCS system side.
Step 1-3: establishing Modbus communication connection between the PCS and the BMS, and uploading BMS states and alarm signals at all levels to the PCS system;
step 1-4: and establishing hard contact connection between the PCS and the BMS, and realizing the redundant uploading of BMS three-level alarm signals to the PCS.
Further, the step 3 comprises:
step 3-1: the EMS immediately sends a power reduction instruction to the corresponding PCS after receiving the primary alarm signal sent by the BMS, the PCS immediately reduces the power to operate after receiving the power reduction instruction sent by the EMS or the primary alarm signal sent by the BMS, and the communication between the PCS and the EMS or the BMS can ensure the reliable execution of the power reduction instruction only if one of the PCS and the EMS is intact;
step 3-2: after receiving the secondary alarm signal sent by the BMS, the EMS immediately sends a shutdown instruction to the corresponding PCS, and the PCS immediately shuts down after receiving the shutdown instruction sent by the EMS or the secondary alarm signal sent by the BMS;
step 3-3: after receiving the three-level alarm signal sent by the BMS, the EMS immediately sends a tripping command to the corresponding PCS, and the PCS immediately trips after receiving the tripping command sent by the EMS or the three-level alarm signal sent by the BMS through a Modbus or a hard wire;
step 3-4: in extreme cases, when the first-level alarm signal is not reliably executed, the fault is continuously developed and then acted by a second-level alarm response mechanism; if the secondary alarm signal is not reliably executed, the fault continues to develop and is acted by a tertiary alarm response mechanism; if IEC61850 and Modbus communication all when breaking down, realize tripping by the hard wire between BMS and the PCS, ensure system safety.
In another aspect, the invention also discloses an alarm response system for a battery system of a high-capacity battery energy storage power station, which is characterized by comprising the following components:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the alert response method of any of the above.
In another aspect, the present invention also discloses a non-transitory computer-readable storage medium, characterized in that the non-transitory computer-readable storage medium stores computer instructions that cause the computer to perform the alarm response method according to any one of the above.
The invention has the advantages that the invention provides the warning response method for the battery system of the high-capacity battery energy storage power station, and the battery energy storage power station adopts the PWM rectification technology and has higher response speed. On the basis of optimizing EMS, PCS and BMS communication mechanisms, the hierarchical rapid processing of alarm signals by the EMS and the PCS is realized organically through two-way or even three-way redundant alarm response channels, the real-time online reliable monitoring and isolation of battery system faults can be realized, and the operation safety of a large-capacity battery system and an energy storage power station is improved.
Drawings
FIG. 1 is a schematic diagram of a communication architecture of three major systems of a battery energy storage power station according to the present invention;
fig. 2 is a flow chart of a battery system three-level alarm response mechanism of the alarm response method of the battery system of the high-capacity battery energy storage power station.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings and examples, in which the technical problems and advantages of the present invention are solved, wherein the described examples are only intended to facilitate the understanding of the present invention, and are not to be construed as limiting in any way.
As shown in fig. 1-2, the monitoring System of the large-capacity Battery Energy storage Power station of the present invention mainly comprises three systems, namely, BMS (Energy Management System), PCS (Power Conversion System), and EMS (Battery Management System).
The BMS is responsible for monitoring the state in the battery compartment and emergently isolating serious faults of the battery system; the PCS is responsible for power conversion of the energy storage converter; the EMS is responsible for the state monitoring and power control of the whole station. The EMS is located in the main cabin, and the PCS and the BMS are respectively located in the on-site PCS cabin and the battery cabin, namely the whole energy storage station comprises one set of EMS and a plurality of sets of PCS and BMS.
When the battery system of the battery compartment is abnormal or has faults, the abnormal state of the battery system can be classified according to the severity by representing the states of battery voltage, battery pack pressure difference, current, temperature, insulation and the like and setting reasonable fixed values. At present, most battery systems of manufacturers adopt a three-level alarm mechanism, and part of manufacturers further subdivide the first-level alarm to realize multi-level current limiting, so that response strategies can be respectively established on an EMS (energy management system) and a PCS (personal communications system) system based on the three-level alarm mechanism of the energy storage power station, and then a redundant and reliable battery system alarm response mechanism is established based on the communication relations among the EMS, the PCS and the BMS. For the first-level alarm and the second-level alarm, reliable response of an alarm mechanism is realized through two redundant channels of IEC61850 protocol communication of BMS- > EMS- > PCS and Modbus protocol communication of BMS- > PCS; corresponding to the third level of alarm, due to serious fault, besides the BMS can act in time to trip off the direct current outlet circuit breaker of the battery stack, a hard contact communication channel of BMS- > PCS is additionally added, and the PCS is reliably stopped when the communication channel is in fault. The battery system fault has an accumulative effect, the primary fault can develop to the secondary fault, the secondary fault can develop to the tertiary fault, and the final safety defense line of the whole system is obtained by processing the tertiary fault.
After a redundant alarm response mechanism is established, the PCS receives two to three alarm signals which reflect the same event at the same time, and from the angle of improving the operation stability of the total station, the PCS delays 1s to execute power reduction after receiving the primary alarm signal sent by the BMS, and receives the power reduction signal sent by the EMS to execute in time, so that the EMS has enough time to redistribute the power of the total station.
As shown in fig. 2, the invention provides a response method based on a three-level alarm response mechanism for a high-capacity battery energy storage power station monitoring system integrating three communication modes of IEC61850, Modbus and hard wiring, so as to realize real-time online reliable monitoring and isolation of battery system faults and improve the operation safety of the high-capacity battery system and the energy storage power station.
The invention relates to a battery system alarm response method of a high-capacity battery energy storage power station, which comprises the following specific steps of:
step 1: the method comprises the following steps of constructing perfect communication among the EMS, the PCS and the BMS, carrying out IEC61850 communication among the EMS, the PCS and the BMS, and carrying out Modbus and hard-wired communication among the PCS and the BMS in parallel and redundantly, so that reliable uploading of BMS alarm information is ensured;
step 2: establishing a BMS three-level alarm and response mechanism, monitoring the running state of the battery system in real time, and immediately sending a signal to the EMS and the PCS by the BMS when an alarm occurs;
and step 3: after receiving the alarm signal sent by BMS, EMS and PCS act synchronously according to established strategy to ensure that BMS alarm signal can still be executed reliably after any communication loop is in fault.
In one embodiment, the step 1 includes:
step 1-1: and establishing Ethernet connection between the EMS and the BMS, and uploading the BMS state and all levels of alarm signals to the EMS system. For BMS manufacturers without IEC61850 protocol communication functions, a communication protocol conversion device is added on the BMS system side;
step 1-2: and establishing Ethernet connection between the EMS and the PCS to realize that the EMS control instruction is issued to the PCS. For PCS manufacturers without IEC61850 protocol communication functions, a communication protocol conversion device is added on a PCS system side;
step 1-3: establishing Modbus communication connection between the PCS and the BMS, and uploading BMS states and alarm signals at all levels to the PCS system;
step 1-4: and establishing hard contact connection between the PCS and the BMS, and realizing the redundant uploading of BMS three-level alarm signals to the PCS.
In one embodiment, the step 2 includes:
step 2-1: dividing battery system state signals such as battery voltage, current, temperature and insulation in the battery compartment into three levels according to severity, determining alarm action values of the three levels of the states of each battery system, and ensuring reliable action and return of the alarm signals of each level;
step 2-2: establishing a BMS alarm signal response mechanism in an EMS system: reducing the operating power of the corresponding energy storage converter when only one level of alarm signal of the state of any battery system is received; when a primary alarm signal and a secondary alarm signal of a certain battery system state are received, a command is issued to stop the corresponding energy storage converter; when receiving a first-level alarm signal, a second-level alarm signal and a third-level alarm signal of a certain battery system state, sending an instruction to enable a corresponding energy storage converter to trip (trip means PCS shutdown, and simultaneously tripping a PCS AC/DC side circuit breaker);
step 2-3: establishing a BMS alarm signal response mechanism in a PCS system, reducing the operating power of a corresponding energy storage converter when only one battery system state primary alarm signal is received, stopping the corresponding energy storage converter by a command when one battery system state primary and secondary alarm signals are received, and tripping the corresponding energy storage converter by a command when one battery system state primary, secondary and tertiary alarm signals are received;
step 2-4: and the BMS system of each battery cabin monitors the state of the battery system in the cabin in real time, reports to the EMS and the PCS system through the IEC61850 and Modbus protocol when monitoring the alarm signal, and sends the alarm signal to the PCS through a hard contact if monitoring the three-level alarm signal.
In one embodiment, the step 3 includes:
step 3-1: the EMS immediately sends a power reduction instruction to the corresponding PCS after receiving the primary alarm signal sent by the BMS, the PCS immediately reduces the power to operate after receiving the power reduction instruction sent by the EMS or the primary alarm signal sent by the BMS, and the communication between the PCS and the EMS or the BMS can ensure the reliable execution of the power reduction instruction only if one of the PCS and the EMS is intact;
step 3-2: after receiving the secondary alarm signal sent by the BMS, the EMS immediately sends a shutdown instruction to the corresponding PCS, and the PCS immediately shuts down after receiving the shutdown instruction sent by the EMS or the secondary alarm signal sent by the BMS;
step 3-3: after receiving the three-level alarm signal sent by the BMS, the EMS immediately sends a tripping command to the corresponding PCS, and the PCS immediately trips after receiving the tripping command sent by the EMS or the three-level alarm signal sent by the BMS through a Modbus or a hard wire;
step 3-4: in extreme cases, when the first-level alarm signal is not reliably executed, the fault is continuously developed and then acted by a second-level alarm response mechanism; if the secondary alarm signal is not reliably executed, the fault continues to develop and is acted by a tertiary alarm response mechanism; if IEC61850 and Modbus communication all when breaking down, realize tripping by the hard wire between BMS and the PCS, ensure system safety. Hard wiring between the BMS and the PCS is the last line of defense for ensuring the safety of the battery system, and the validity and the reliability of the signal need to be verified and checked in an important way during field debugging and operation and maintenance.
It is worth mentioning that the alarm response method of the invention is particularly suitable for the redundant system of the battery of the high-capacity battery energy storage power station in fig. 1, has low requirement on hardware and small progress rate of software change, and ensures real-time online reliable monitoring and isolation of the battery system fault from multiple angles by establishing a three-level alarm mechanism on the high-capacity battery energy storage power station monitoring system organically integrating three communication modes of IEC61850, Modbus and hard wiring, thereby improving the operation safety of the high-capacity battery system and the energy storage power station.
Finally, the description is as follows: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A warning response method for a battery system of a high-capacity battery energy storage power station is characterized by comprising the following steps:
step 1: establishing perfect communication among the EMS, the PCS and the BMS, wherein the EMS, the PCS and the BMS respectively carry out IEC61850 communication, and the PCS and the BMS carry out Modbus and hard-wired communication in parallel and redundantly so as to ensure reliable uploading of BMS alarm information;
step 2: establishing a BMS three-level alarm and response mechanism, monitoring the running state of the battery system in real time, and immediately sending a signal to the EMS and the PCS by the BMS when an alarm occurs;
the step 2 specifically comprises:
step 2-1: dividing the state signals of the battery system in the battery compartment into three levels according to the severity, determining the alarm action values of the three levels of the state of each battery system, and ensuring the reliable action and return of the alarm signals of each level;
step 2-2: establishing a BMS alarm signal response mechanism in an EMS system: reducing the operating power of the corresponding energy storage converter when only one level of alarm signal of the state of any battery system is received; when a primary alarm signal and a secondary alarm signal of a certain battery system state are received, a command is issued to stop the corresponding energy storage converter; when receiving a first-level alarm signal, a second-level alarm signal and a third-level alarm signal of a certain battery system state, sending an instruction to enable a corresponding energy storage converter to trip, wherein the trip refers to the PCS shutdown and simultaneously tripping a PCS AC/DC side circuit breaker;
step 2-3: establishing a BMS alarm signal response mechanism in a PCS system, reducing the operating power of a corresponding energy storage converter when only one battery system state primary alarm signal is received, stopping the corresponding energy storage converter by a command when one battery system state primary and secondary alarm signals are received, and tripping the corresponding energy storage converter by a command when one battery system state primary, secondary and tertiary alarm signals are received;
step 2-4: the BMS system of each battery compartment monitors the state of the battery system in the compartment in real time, and when monitoring the alarm signal, the BMS and the PCS system are reported through IEC61850 and Modbus protocol at the same time, and if monitoring the three-level alarm signal, the BMS system sends the alarm signal to the PCS through a hard contact;
and step 3: after receiving the alarm signal sent by BMS, EMS and PCS act synchronously according to established strategy to ensure that BMS alarm signal can still be executed reliably after any communication loop is in fault.
2. The alarm response method according to claim 1, wherein the battery system status signal of step 2-1 comprises a voltage, a current, a temperature and/or an insulation signal.
3. The alarm response method according to claim 1, wherein the step 1 comprises:
step 1-1: establishing Ethernet connection between the EMS and the BMS, and uploading BMS states and alarm signals of all levels to the EMS system; for BMS manufacturers without IEC61850 protocol communication functions, a communication protocol conversion device is added on the BMS system side;
step 1-2: establishing Ethernet connection between the EMS and the PCS to realize that an EMS control instruction is issued to the PCS; for PCS manufacturers without IEC61850 protocol communication functions, a communication protocol conversion device is added on a PCS system side;
step 1-3: establishing Modbus communication connection between the PCS and the BMS, and uploading BMS states and alarm signals at all levels to the PCS system;
step 1-4: and establishing hard contact connection between the PCS and the BMS, and realizing the redundant uploading of BMS three-level alarm signals to the PCS.
4. The alarm response method according to claim 1, wherein the step 3 comprises:
step 3-1: the EMS immediately sends a power reduction instruction to the corresponding PCS after receiving the primary alarm signal sent by the BMS, the PCS immediately reduces the power to operate after receiving the power reduction instruction sent by the EMS or the primary alarm signal sent by the BMS, and the communication between the PCS and the EMS or the BMS can ensure the reliable execution of the power reduction instruction only if one of the PCS and the EMS is intact;
step 3-2: after receiving the secondary alarm signal sent by the BMS, the EMS immediately sends a shutdown instruction to the corresponding PCS, and the PCS immediately shuts down after receiving the shutdown instruction sent by the EMS or the secondary alarm signal sent by the BMS;
step 3-3: after receiving the three-level alarm signal sent by the BMS, the EMS immediately sends a tripping command to the corresponding PCS, and the PCS immediately trips after receiving the tripping command sent by the EMS or the three-level alarm signal sent by the BMS through a Modbus or a hard wire;
step 3-4: in extreme cases, when the first-level alarm signal is not reliably executed, the fault is continuously developed and then acted by a second-level alarm response mechanism; if the secondary alarm signal is not reliably executed, the fault continues to develop and is acted by a tertiary alarm response mechanism; if IEC61850 and Modbus communication all when breaking down, realize tripping by the hard wire between BMS and the PCS, ensure system safety.
5. The utility model provides a large capacity battery energy storage power station battery system reports an emergency and asks for help or increased vigilance response system which characterized in that includes:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to enable execution of the alert response method of any of claims 1 to 4.
6. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the alarm response method according to any one of claims 1 to 4.
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| CN110880811B (en) * | 2019-11-25 | 2024-04-19 | 国网湖南省电力有限公司 | Communication device and method for battery energy storage power station |
| CN110970914A (en) * | 2019-11-26 | 2020-04-07 | 力神动力电池系统有限公司 | Energy storage system with safety protection function |
| KR102371197B1 (en) * | 2020-02-10 | 2022-03-07 | 삼성에스디아이 주식회사 | Protection system of energy storage system |
| CN111308913B (en) * | 2020-03-18 | 2023-06-09 | 国网湖南省电力有限公司 | A hardware-in-the-loop simulation modeling method for large-capacity battery energy storage power stations |
| CN111641261A (en) * | 2020-05-08 | 2020-09-08 | 上海宝准电源科技有限公司 | High-reliability energy storage power station communication architecture and method thereof |
| CN112564225A (en) * | 2020-12-10 | 2021-03-26 | 杭州平旦科技有限公司 | Multi-stage combined protection method suitable for storage type energy storage system |
| CN113489077A (en) * | 2021-05-21 | 2021-10-08 | 蓝谷智慧(北京)能源科技有限公司 | Safety control system of power changing station |
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