CN106921210B - A flow battery auxiliary power supply device and its working method - Google Patents
A flow battery auxiliary power supply device and its working method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
Description
技术领域technical field
本发明涉及液流电池技术领域，具体为一种液流电池辅助供电装置及其工作方法。The invention relates to the technical field of liquid flow batteries, in particular to a liquid flow battery auxiliary power supply device and a working method thereof.
背景技术Background technique
液流电池一般通过储能逆变器连接交流电网以完成其谷电峰用、平衡负荷或提高电能质量等功能。图1示出了现有技术的液流电池的供电示意图，参考图1所示，液流电池在运行和工作时，与储能逆变器2相连接的储能逆变器2控制器、以及与液流电池本体3相连接的电池辅助设备和电池管理系统均与UPS4输出端相连接，UPS4输入端经由变压器1连接交流母线，当交流母线正常供电时，UPS4对交流母线电压经变压器1进行电压变换后得到的电压进行稳压后供应给储能逆变器2控制器、电池辅助设备和电池管理系统使用，当交流母线供电中断时，UPS4直接将电池的直流电能通过逆变零切换的方法向储能逆变器2控制器、电池辅助设备和电池管理系统继续供应电能，这里的液流电池本体3包括电堆、正极电解液储罐、负极电解液储罐和电解液循环管路；所述电池辅助设备是维持电解液循环的必不可少的装置，至少包括循环泵和电解液循环管路上的电动阀门，以上方式存在如下问题：UPS通常包含主机和电池本体等多个设备，所需空间较大，价格昂贵；当交流电网异常或失电时，液流电池运行时间取决于UPS容量，备电时间非常短；液流电池停机之后，电堆内遗留的电能会以漏电的形式释放，电能损失多，降低电池效率。The flow battery is generally connected to the AC grid through the energy storage inverter to complete its functions such as valley power consumption, load balancing or power quality improvement. FIG. 1 shows a schematic diagram of the power supply of a flow battery in the prior art. Referring to FIG. 1 , when the flow battery is running and working, the controller of the energy storage inverter 2 connected to the energy storage inverter 2 , And the battery auxiliary equipment and the battery management system connected with the flow battery body 3 are all connected with the output end of the UPS4, and the input end of the UPS4 is connected to the AC bus through the transformer 1. The voltage obtained after the voltage conversion is regulated and supplied to the energy storage inverter 2 controller, battery auxiliary equipment and battery management system. When the AC bus power supply is interrupted, the UPS4 directly switches the DC power of the battery through the inverter zero switching. The method continues to supply electric energy to the energy storage inverter 2 controller, battery auxiliary equipment and battery management system, where the flow battery body 3 includes a stack, a positive electrolyte storage tank, a negative electrolyte storage tank and an electrolyte circulation pipe. The battery auxiliary equipment is an indispensable device for maintaining the electrolyte circulation, at least including the circulating pump and the electric valve on the electrolyte circulation pipeline. The above methods have the following problems: UPS usually includes multiple devices such as the host and the battery itself. , the space required is large and the price is expensive; when the AC grid is abnormal or power outage, the running time of the flow battery depends on the capacity of the UPS, and the backup time is very short; after the flow battery is stopped, the electric energy left in the stack will leak electricity. In the form of release, more power is lost and the battery efficiency is reduced.
发明内容SUMMARY OF THE INVENTION
本发明针对以上问题的提出，而研制一种液流电池辅助供电装置及其工作方法。In view of the above problems, the present invention develops a flow battery auxiliary power supply device and a working method thereof.
本发明的技术手段如下：The technical means of the present invention are as follows:
一种液流电池辅助供电装置，所述液流电池包括液流电池本体、与液流电池本体相连接的电池辅助设备和电池管理系统；所述液流电池本体与储能逆变器直流侧相连接，所述储能逆变器连接有储能逆变器控制器，所述装置包括：A flow battery auxiliary power supply device, the flow battery includes a flow battery body, a battery auxiliary device connected to the flow battery body, and a battery management system; the flow battery body and the DC side of an energy storage inverter connected, the energy storage inverter is connected with an energy storage inverter controller, and the device includes:
连接所述液流电池的电力电容器和DC/DC变换器；所述电力电容器作为所 述液流电池本体的启动电源，用于当电网无法供电时输出电能给所述电池辅助设备和电池管理系统供电；当电网无法供电时，在所述液流电池本体启动之后，所述电力电容器不再输出电能给所述电池辅助设备和电池管理系统，所述DC/DC变换器对液流电池本体所储存的电能进行DC-DC变换后输出电能给所述电池辅助设备、电池管理系统和所述储能逆变器控制器供电；Connect the power capacitor of the flow battery and the DC/DC converter; the power capacitor is used as the starting power source of the flow battery body to output electric energy to the battery auxiliary equipment and the battery management system when the power grid cannot supply power Power supply; when the power grid cannot supply power, after the flow battery body is started, the power capacitor no longer outputs electric energy to the battery auxiliary equipment and the battery management system, and the DC/DC converter has no effect on the flow battery body. After the stored electric energy is converted into DC-DC, the electric energy is output to supply power to the battery auxiliary equipment, the battery management system and the energy storage inverter controller;
进一步地，所述储能逆变器通过变压器连接交流母线，当电网无法供电时，所述电池管理系统发送黑启动模式控制指令给所述储能逆变器控制器，在所述储能逆变器控制器得电后，所述储能逆变器控制器控制所述储能逆变器进入V/F控制模式，储能逆变器调整输出电压使得变压器升压后得到的电压满足电能质量国家标准所规定的电能质量要求；Further, the energy storage inverter is connected to the AC bus through a transformer. When the power grid cannot supply power, the battery management system sends a black start mode control command to the energy storage inverter controller. After the inverter controller is powered, the energy storage inverter controller controls the energy storage inverter to enter the V/F control mode, and the energy storage inverter adjusts the output voltage so that the voltage obtained after the transformer is boosted meets the electrical energy. The power quality requirements stipulated in the national quality standards;
另外，所述装置还包括置于所述液流电池本体和电力电容器之间的第一可控开关；在所述液流电池本体启动之后和所述液流电池本体停机之后，所述液流电池本体经由所述第一可控开关给电力电容器充电，当电力电容器充满电后，所述第一可控开关断开；In addition, the device further includes a first controllable switch placed between the flow battery body and the power capacitor; after the flow battery body is started and the flow battery body is stopped, the flow battery The battery body charges the power capacitor through the first controllable switch, and when the power capacitor is fully charged, the first controllable switch is turned off;
进一步地，根据液流电池本体启动所需时间来调节所述电力电容器的容值；Further, the capacitance value of the power capacitor is adjusted according to the time required for the start-up of the flow battery body;
进一步地，所述电池管理系统包括：Further, the battery management system includes:
位于远程的人机接口和CPU模块；Remotely located human-machine interface and CPU module;
位于现场，用于采集液流电池运行参数的采集模块；A collection module located on site, used to collect the operating parameters of the flow battery;
布置于所述液流电池附近的分布式I/O站点；所述采集模块通过分布式I/O站点将采集到的液流电池运行参数传输给CPU模块；所述CPU模块判断接收到的液流电池运行参数是否异常，以及输出液流电池运行状态控制信号并通过分布式I/O站点传输给液流电池；所述CPU模块通过现场总线连接所述分布式I/O站点，以及连接所述储能逆变器；A distributed I/O station arranged near the flow battery; the acquisition module transmits the collected flow battery operating parameters to the CPU module through the distributed I/O station; the CPU module judges the received liquid flow battery Whether the flow battery operating parameters are abnormal, and output the flow battery operating state control signal and transmit it to the flow battery through the distributed I/O site; the CPU module is connected to the distributed I/O site through the field bus, and is connected to all the energy storage inverter;
进一步地，所述电池辅助设备、电池管理系统和储能逆变器控制器均为直流用电设备；所述电池辅助设备和电池管理系统，与电力电容器之间通过直流母线相互连接；Further, the battery auxiliary equipment, the battery management system and the energy storage inverter controller are all DC electrical equipment; the battery auxiliary equipment and the battery management system are connected to the power capacitors through a DC bus;
另外，所述装置还包括：In addition, the device also includes:
与所述电力电容器相连接，用于检测所述电力电容器充电状态的第一检测器；a first detector connected to the power capacitor for detecting the state of charge of the power capacitor;
用于检测电网供电状态的第二检测器；a second detector for detecting the state of grid power;
串接在所述电力电容器与电池辅助设备、电池管理系统之间的第二可控开 关；当电网无法供电时所述第二可控开关闭合，此时电力电容器经由第二可控开关输出电能给电池辅助设备和电池管理系统，在所述液流电池本体启动之后所述第二可控开关断开；A second controllable switch connected in series between the power capacitor, the battery auxiliary equipment, and the battery management system; the second controllable switch is closed when the power grid cannot supply power, and the power capacitor outputs electrical energy through the second controllable switch at this time For battery auxiliary equipment and battery management systems, the second controllable switch is turned off after the flow battery body is activated;
与第一检测器、第二检测器、第一可控开关和第二可控开关相连接的控制系统；所述控制系统用于根据检测到的电力电容器充电状态对电力电容器是否充满电进行判断，根据检测到的电网供电状态对电网是否能够正常供电进行判断；所述控制系统还用于当电网无法供电时控制所述第二可控开关闭合，当所述液流电池本体启动完成后控制所述第二可控开关断开，当电力电容器充满电后控制所述第一可控开关断开。a control system connected with the first detector, the second detector, the first controllable switch and the second controllable switch; the control system is used for judging whether the power capacitor is fully charged according to the detected charging state of the power capacitor , according to the detected power supply state of the power grid to determine whether the power grid can supply power normally; the control system is also used to control the second controllable switch to close when the power grid cannot supply power, and control the flow battery body after the start of the flow battery is completed. The second controllable switch is turned off, and when the power capacitor is fully charged, the first controllable switch is controlled to be turned off.
一种如上所述液流电池辅助供电装置的工作方法，其特征在于所述方法包括如下步骤：A working method of the above-mentioned flow battery auxiliary power supply device, characterized in that the method comprises the following steps:
步骤1：第二检测器检测电网供电状态，执行步骤2；Step 1: the second detector detects the power supply state of the power grid, and executes Step 2;
步骤2：控制系统判断电网是否能够正常供电，是则返回步骤1，否则执行步骤3；Step 2: The control system determines whether the power grid can supply power normally, if yes, return to Step 1, otherwise, go to Step 3;
步骤3：控制系统控制第二可控开关闭合，执行步骤4；Step 3: The control system controls the second controllable switch to close, and executes Step 4;
步骤4：电力电容器作为所述液流电池本体的启动电源，输出电能给所述电池辅助设备和电池管理系统供电，执行步骤5；Step 4: The power capacitor is used as the starting power source of the flow battery body, and outputs electric energy to supply power to the battery auxiliary equipment and the battery management system, and step 5 is performed;
步骤5：控制系统判断液流电池本体是否启动完成，是则执行步骤6，否则返回步骤5；Step 5: The control system judges whether the start-up of the flow battery body is completed, if so, go to Step 6, otherwise return to Step 5;
步骤6：控制系统控制所述第二可控开关断开，执行步骤7；Step 6: the control system controls the second controllable switch to be turned off, and executes Step 7;
步骤7：DC/DC变换器对液流电池本体所储存的电能进行DC-DC变换后输出电能给所述电池辅助设备、电池管理系统和所述储能逆变器控制器供电；Step 7: The DC/DC converter performs DC-DC conversion on the electrical energy stored in the flow battery body and outputs electrical energy to supply power to the battery auxiliary equipment, the battery management system and the energy storage inverter controller;
另外，所述工作方法还包括如下步骤：In addition, the working method also includes the following steps:
当电网无法供电时，所述电池管理系统发送黑启动模式控制指令给所述储能逆变器控制器，在所述储能逆变器控制器得电后，所述储能逆变器控制器控制所述储能逆变器进入V/F控制模式，储能逆变器调整输出电压使得变压器升压后得到的电压满足电能质量国家标准所规定的电能质量要求；When the power grid cannot supply power, the battery management system sends a black start mode control command to the energy storage inverter controller. After the energy storage inverter controller is powered, the energy storage inverter controls The energy storage inverter controls the energy storage inverter to enter the V/F control mode, and the energy storage inverter adjusts the output voltage so that the voltage obtained after the transformer is boosted meets the power quality requirements specified in the national standard for power quality;
另外，所述工作方法还包括如下步骤：在所述液流电池本体启动之后和所述液流电池本体停机之后，所述液流电池本体经由所述第一可控开关给电力电容器充电，当电力电容器充满电后，控制系统控制所述第一可控开关断开。In addition, the working method further includes the following steps: after the flow battery body is started and after the flow battery body is stopped, the flow battery body charges the power capacitor through the first controllable switch, and when the flow battery body is turned off After the power capacitor is fully charged, the control system controls the first controllable switch to be turned off.
由于采用了上述技术方案，本发明提供的一种液流电池辅助供电装置及其 工作方法，与现有技术相比具有如下优点：Owing to adopting the above-mentioned technical scheme, a kind of liquid flow battery auxiliary power supply device and its working method provided by the present invention have the following advantages compared with the prior art:
1、将电力电容器配套为给液流电池供电的电网失电后的启动电源，保证了液流电池的瞬时启动和后期稳定运行，具有成本低、启动迅速的优点。1. The power capacitor is matched as the starting power supply after the power grid powering the flow battery loses power, which ensures the instantaneous start and stable operation of the flow battery in the later period, and has the advantages of low cost and rapid start.
2、本发明电力电容器的容量只需满足液流电池启动所需时间即可，当液流电池启动后，电池辅助设备供电完全由液流电池自身给电池辅助设备、电池管理系统和储能逆变器控制器供电，充分利用液流电池电量，提高电池利用率。2. The capacity of the power capacitor of the present invention only needs to meet the time required for the start-up of the flow battery. After the flow battery is started, the power supply of the battery auxiliary equipment is completely supplied by the flow battery itself to the battery auxiliary equipment, the battery management system and the energy storage inverter. The inverter controller supplies power, makes full use of the power of the flow battery, and improves the battery utilization rate.
3、液流电池运行完毕需要进行停机操作时，电堆内的遗留电能首选为电力电容器充电，在消耗电堆内剩余电量的同时满足了电力电容器的容量需求，大大提高了电池效率和利用率。3. When the flow battery needs to be shut down after the operation, the residual electric energy in the stack is firstly used to charge the power capacitor, which can satisfy the capacity requirement of the power capacitor while consuming the remaining power in the stack, and greatly improve the battery efficiency and utilization rate. .
4、与现有技术相比，有效解决了目前钒液流电池无法完全自启动问题。4. Compared with the prior art, it effectively solves the problem that the current vanadium redox flow battery cannot be fully self-started.
附图说明Description of drawings
图1是本发明现有技术的液流电池的供电示意图；Fig. 1 is the power supply schematic diagram of the flow battery of the prior art of the present invention;
图2是本发明所述装置的结构框图；Fig. 2 is the structural block diagram of the device of the present invention;
图3是本发明所述电池管理系统与液流电池和储能逆变器之间的连接示意图；3 is a schematic diagram of the connection between the battery management system according to the present invention, the flow battery and the energy storage inverter;
图4是当电网无法供电时电力电容器输出电能给所述电池辅助设备和电池管理系统供电的示意图；4 is a schematic diagram of the power capacitor outputting power to supply power to the battery auxiliary equipment and the battery management system when the power grid cannot supply power;
图5是当电网无法供电时，在液流电池启动之后的液流电池供电示意图；FIG. 5 is a schematic diagram of the power supply of the flow battery after the start of the flow battery when the power grid cannot supply power;
图6是本发明所述方法的流程图。Figure 6 is a flow chart of the method of the present invention.
图中：1、变压器，2、储能逆变器，3、液流电池本体，4、UPS，5、人机接口，6、CPU模块，7、现场总线，8、分布式I/O站点。In the picture: 1. Transformer, 2. Energy storage inverter, 3. Flow battery body, 4. UPS, 5. Human-machine interface, 6. CPU module, 7. Fieldbus, 8. Distributed I/O station .
具体实施方式Detailed ways
如图2和图3所示的一种液流电池辅助供电装置，所述液流电池包括液流电池本体3、与液流电池本体3相连接的电池辅助设备和电池管理系统；所述液流电池本体3与储能逆变器2直流侧相连接，所述储能逆变器2连接有储能逆变器控制器，所述装置包括：连接所述液流电池的电力电容器和DC/DC变换器；所述电力电容器作为所述液流电池本体3的启动电源，用于当电网无法供电时输出电能给所述电池辅助设备和电池管理系统供电；当电网无法供电时，在所述液流电池本体3启动之后，所述电力电容器不再输出电能给所述电池辅助设备和电池管理系统，所述DC/DC变换器对液流电池本体3所储存的电能进行DC-DC变换后输出电能给所述电池辅助设备、电池管理系统和所述储能逆变器 控制器供电；进一步地，所述储能逆变器2通过变压器1连接交流母线，当电网无法供电时，所述电池管理系统发送黑启动模式控制指令给所述储能逆变器控制器，在所述储能逆变器控制器得电后，所述储能逆变器控制器控制所述储能逆变器2进入V/F控制模式，储能逆变器2调整输出电压使得变压器1升压后得到的电压满足电能质量国家标准所规定的电能质量要求；另外，所述装置还包括置于所述液流电池本体3和电力电容器之间的第一可控开关；在所述液流电池本体3启动之后和所述液流电池本体3停机之后，所述液流电池本体3经由所述第一可控开关给电力电容器充电，当电力电容器充满电后，所述第一可控开关断开；进一步地，根据液流电池本体3启动所需时间来调节所述电力电容器的容值；进一步地，所述电池管理系统包括：位于远程的人机接口5和CPU模块6；位于现场，用于采集液流电池运行参数的采集模块；布置于所述液流电池附近的分布式I/O站点8；所述采集模块通过分布式I/O站点8将采集到的液流电池运行参数传输给CPU模块6；所述CPU模块6判断接收到的液流电池运行参数是否异常，以及输出液流电池运行状态控制信号并通过分布式I/O站点8传输给液流电池；所述CPU模块6通过现场总线7连接所述分布式I/O站点8，以及连接所述储能逆变器2；进一步地，所述电池辅助设备、电池管理系统和储能逆变器控制器均为直流用电设备；所述电池辅助设备和电池管理系统，与电力电容器之间通过直流母线相互连接；另外，所述装置还包括：与所述电力电容器相连接，用于检测所述电力电容器充电状态的第一检测器；用于检测电网供电状态的第二检测器；串接在所述电力电容器与电池辅助设备、电池管理系统之间的第二可控开关；当电网无法供电时所述第二可控开关闭合，此时电力电容器经由第二可控开关输出电能给电池辅助设备和电池管理系统，在所述液流电池本体3启动之后所述第二可控开关断开；与第一检测器、第二检测器、第一可控开关和第二可控开关相连接的控制系统；所述控制系统用于根据检测到的电力电容器充电状态对电力电容器是否充满电进行判断，根据检测到的电网供电状态对电网是否能够正常供电进行判断；所述控制系统还用于当电网无法供电时控制所述第二可控开关闭合，当所述液流电池本体3启动完成后控制所述第二可控开关断开，当电力电容器充满电后控制所述第一可控开关断开；所述液流电池本体3包括电堆、正极电解液储罐、负极电解液储罐和电解液循环管路；所述液流电池本体3启动所需时间是指从循环泵启动至液流电池本体3输出电压达到储能逆变器2最低工作电压的时间，该时间最长为2 分钟；当液流电池本体3输出电压达到储能逆变器2最低工作电压时，认为液流电池本体3启动完成；另外，电池辅助设备、电池管理系统和储能逆变器控制器均有相应的直流用电设备和交流用电设备，现有技术中的液流电池的供电结构中，所采用的电池辅助设备、电池管理系统和储能逆变器控制器为交流用电设备，本发明中的电池辅助设备、电池管理系统和储能逆变器控制器为直流用电设备；本发明所述电池辅助设备和电池管理系统，与电力电容器之间通过直流母线相互连接。As shown in FIG. 2 and FIG. 3, the flow battery auxiliary power supply device includes a flow battery body 3, a battery auxiliary device connected to the flow battery body 3, and a battery management system; The flow battery body 3 is connected to the DC side of the energy storage inverter 2, and the energy storage inverter 2 is connected with an energy storage inverter controller. The device includes: a power capacitor connected to the flow battery and a DC /DC converter; the power capacitor is used as the starting power source of the flow battery body 3 to output electric energy to supply power to the battery auxiliary equipment and the battery management system when the power grid cannot supply power; After the flow battery body 3 is started, the power capacitor no longer outputs electric energy to the battery auxiliary equipment and the battery management system, and the DC/DC converter performs DC-DC conversion on the electric energy stored in the flow battery body 3 Then, the electric energy is output to supply power to the battery auxiliary equipment, the battery management system and the energy storage inverter controller; further, the energy storage inverter 2 is connected to the AC bus through the transformer 1. When the power grid cannot supply power, the energy storage inverter 2 The battery management system sends a black start mode control command to the energy storage inverter controller, and after the energy storage inverter controller is powered on, the energy storage inverter controller controls the energy storage inverter controller. The transformer 2 enters the V/F control mode, and the energy storage inverter 2 adjusts the output voltage so that the voltage obtained after the transformer 1 is boosted meets the power quality requirements specified by the national standard for power quality; The first controllable switch between the flow battery body 3 and the power capacitor; after the flow battery body 3 is started and the flow battery body 3 is stopped, the flow battery body 3 passes through the first controllable switch. A controllable switch charges the power capacitor, and when the power capacitor is fully charged, the first controllable switch is turned off; further, the capacitance value of the power capacitor is adjusted according to the time required for the start-up of the flow battery body 3; further The battery management system includes: a human-machine interface 5 and a CPU module 6 located remotely; an acquisition module located on site for collecting operating parameters of the flow battery; a distributed I/O arranged near the flow battery Site 8; the collection module transmits the collected flow battery operating parameters to the CPU module 6 through the distributed I/O site 8; the CPU module 6 judges whether the received flow battery operating parameters are abnormal, and the output fluid The flow battery operating state control signal is transmitted to the flow battery through the distributed I/O station 8; the CPU module 6 is connected to the distributed I/O station 8 through the field bus 7, and is connected to the energy storage inverter 2. Further, the battery auxiliary equipment, the battery management system, and the energy storage inverter controller are all DC electrical equipment; the battery auxiliary equipment and the battery management system are connected to the power capacitor through a DC bus; In addition, the device further comprises: a first detector connected to the power capacitor for detecting the charging state of the power capacitor; a second detector for detecting the power supply state of the grid; connected in series with the power capacitor with battery assist A second controllable switch between the equipment and the battery management system; when the power grid cannot supply power, the second controllable switch is closed, and the power capacitor outputs power to the battery auxiliary equipment and the battery management system through the second controllable switch at this time. After the flow battery body 3 is started, the second controllable switch is disconnected; the control system connected with the first detector, the second detector, the first controllable switch and the second controllable switch; the control The system is used to judge whether the power capacitor is fully charged according to the detected charging state of the power capacitor, and to judge whether the power grid can supply power normally according to the detected power supply status of the power grid; the control system is also used to control the power supply when the power grid cannot supply power. The second controllable switch is closed, when the flow battery body 3 is started, the second controllable switch is controlled to open, and when the power capacitor is fully charged, the first controllable switch is controlled to open; the liquid The flow battery body 3 includes a stack, a positive electrode electrolyte storage tank, a negative electrode electrolyte storage tank and an electrolyte circulation pipeline; the time required for the start of the flow battery body 3 refers to the time from the start of the circulation pump to the output of the flow battery body 3 The time when the voltage reaches the minimum working voltage of the energy storage inverter 2, and the maximum time is 2 minutes; when the output voltage of the flow battery body 3 reaches the minimum working voltage of the energy storage inverter 2, it is considered that the flow battery body 3 has been started up. ; In addition, battery auxiliary equipment, battery management system and energy storage inverter controller all have corresponding DC power equipment and AC power equipment. In the power supply structure of the flow battery in the prior art, the battery auxiliary power The equipment, the battery management system and the energy storage inverter controller are AC electrical equipment, and the battery auxiliary equipment, the battery management system and the energy storage inverter controller in the present invention are DC electrical equipment; the battery auxiliary equipment of the present invention The equipment and battery management system are interconnected with the power capacitors through the DC bus.
如图6所示的一种如上所述液流电池辅助供电装置的工作方法，其特征在于所述方法包括如下步骤：As shown in FIG. 6, a working method of the above-mentioned flow battery auxiliary power supply device is characterized in that the method comprises the following steps:
步骤1：第二检测器检测电网供电状态，执行步骤2；Step 1: the second detector detects the power supply state of the power grid, and executes Step 2;
步骤2：控制系统判断电网是否能够正常供电，是则返回步骤1，否则执行步骤3；Step 2: The control system determines whether the power grid can supply power normally, if yes, return to Step 1, otherwise, go to Step 3;
步骤3：控制系统控制第二可控开关闭合，执行步骤4；Step 3: The control system controls the second controllable switch to close, and executes Step 4;
步骤4：电力电容器作为所述液流电池本体3的启动电源，输出电能给所述电池辅助设备和电池管理系统供电，执行步骤5；Step 4: The power capacitor is used as the starting power source of the flow battery body 3 to output electric energy to supply power to the battery auxiliary equipment and the battery management system, and step 5 is performed;
步骤5：控制系统判断液流电池本体3是否启动完成，是则执行步骤6，否则返回步骤5；Step 5: The control system judges whether the flow battery body 3 has been started up, and if so, executes Step 6, otherwise returns to Step 5;
步骤6：控制系统控制所述第二可控开关断开，执行步骤7；Step 6: the control system controls the second controllable switch to be turned off, and executes Step 7;
步骤7：DC/DC变换器对液流电池本体3所储存的电能进行DC-DC变换后输出电能给所述电池辅助设备、电池管理系统和所述储能逆变器控制器供电；Step 7: The DC/DC converter performs DC-DC conversion on the electrical energy stored in the flow battery body 3 and outputs electrical energy to supply power to the battery auxiliary equipment, the battery management system and the energy storage inverter controller;
另外，所述工作方法还包括如下步骤：当电网无法供电时，所述电池管理系统发送黑启动模式控制指令给所述储能逆变器控制器，在所述储能逆变器控制器得电后，所述储能逆变器控制器控制所述储能逆变器2进入V/F控制模式，储能逆变器2调整输出电压使得变压器1升压后得到的电压满足电能质量国家标准所规定的电能质量要求；另外，所述工作方法还包括如下步骤：在所述液流电池本体3启动之后和所述液流电池本体3停机之后，所述液流电池本体3经由所述第一可控开关给电力电容器充电，当电力电容器充满电后，控制系统控制所述第一可控开关断开。In addition, the working method further includes the following steps: when the power grid cannot supply power, the battery management system sends a black start mode control instruction to the energy storage inverter controller, and the energy storage inverter controller obtains a After the power is turned on, the energy storage inverter controller controls the energy storage inverter 2 to enter the V/F control mode, and the energy storage inverter 2 adjusts the output voltage so that the voltage obtained after the transformer 1 is boosted meets the power quality requirements. The power quality requirements specified in the standard; in addition, the working method further includes the following steps: after the flow battery body 3 is started and the flow battery body 3 is stopped, the flow battery body 3 passes through the The first controllable switch charges the power capacitor, and when the power capacitor is fully charged, the control system controls the first controllable switch to turn off.
如图2所示，本发明所述液流电池本体3和所述电力电容器之间还串接有用于防止倒充的二极管VD1；所述第二检测器与交流母线相连接；在电网正常供电时，本发明储能逆变器控制器控制储能逆变器2工作在PQ控制方式，在电 网无法供电时，电池管理系统发送黑启动模式控制指令给所述储能逆变器控制器(电池管理系统与储能逆变器控制器之间的连接图1中未示出)，则储能逆变器2由PQ控制模式改变为V/F控制模式，储能逆变器2能够实现并网和离网的无缝切换。As shown in FIG. 2 , a diode VD1 for preventing reverse charging is also connected in series between the flow battery body 3 and the power capacitor of the present invention; the second detector is connected to the AC bus; the power supply is normally supplied in the grid When the energy storage inverter controller of the present invention controls the energy storage inverter 2 to work in the PQ control mode, when the power grid cannot supply power, the battery management system sends a black start mode control command to the energy storage inverter controller ( The connection between the battery management system and the energy storage inverter controller is not shown in Figure 1), then the energy storage inverter 2 is changed from the PQ control mode to the V/F control mode, and the energy storage inverter 2 can realize Seamless switching between on-grid and off-grid.
图3是本发明所述电池管理系统与液流电池和储能逆变器2之间的连接示意图，如图3所示，电池管理系统所包括的CPU模块6通过现场总线7与储能逆变器2相连接，便于了解储能逆变器2交流侧的电网参数、储能逆变器2的工作状态；所述采集模块可以为信号传感器、信号变送器和一些信号转换模块；所述分布式I/O站点8与液流电池之间还具有驱动模块，该驱动模块根据接收到的液流电池启动信号驱动所述液流电池具有的多个电动阀和循环泵运行，该驱动模块根据接收到的液流电池停止信号驱动所述液流电池具有的多个电动阀和循环泵停止；所述液流电池运行状态控制信号至少包括液流电池启动信号、液流电池停止信号和液流电池充放电功率设置信号；液流电池运行参数包括电解液流量、电解液压力、电解液温度、电解液液位状态等；本发明所述电能质量国家标准具体可以为《GB/T12325-2008电能质量供电电压偏差》和《GB/T 14549-1993电能质量公用电网谐波》。FIG. 3 is a schematic diagram of the connection between the battery management system according to the present invention, the flow battery and the energy storage inverter 2. As shown in FIG. 3, the CPU module 6 included in the battery management system communicates with the energy storage inverter through the field bus 7. The inverter 2 is connected to each other, which is convenient to know the grid parameters of the AC side of the energy storage inverter 2 and the working state of the energy storage inverter 2; the acquisition module can be a signal sensor, a signal transmitter and some signal conversion modules; There is also a drive module between the distributed I/O station 8 and the flow battery, and the drive module drives a plurality of electric valves and circulating pumps of the flow battery to operate according to the received flow battery start signal. The module drives a plurality of electric valves and circulating pumps of the flow battery to stop according to the received flow battery stop signal; the flow battery operating state control signal at least includes a flow battery start signal, a flow battery stop signal and The charging and discharging power setting signal of the flow battery; the operating parameters of the flow battery include the electrolyte flow rate, the electrolyte pressure, the electrolyte temperature, the electrolyte liquid level status, etc. 2008 Power Quality Supply Voltage Deviation" and "GB/T 14549-1993 Power Quality Harmonics of Public Grid".
图4示出了当电网无法供电时电力电容器输出电能给所述电池辅助设备和电池管理系统供电的示意图，如图4所示，其中C为电力电容器的容值，RL为负荷(电池辅助设备和电池管理系统)的电阻值，则根据公式Uc＝U0*e[-1/(RL*C)]可知，电力电容器的电压Uc是按照指数规律衰减的，衰减速度取决于1/(RL*C),经过一个RL*C时间后，电力电容器的电压Uc衰减了63.2％，约为原值的36.8％，因此通过调节容值C来保证电力电容器的供电时间；图5示出了当电网无法供电时，在液流电池启动之后的液流电池供电示意图，如图5所示，液流电池相当于一个恒压源，Us为该恒压源的输出电压、Rs为内阻，C为电力电容器的容值，RL为负荷(电池辅助设备和电池管理系统)的电阻值，则根据公式Uc＝Us*RL/(Rs+RL)，由于Rs<<RL，故Uc≈Us。Figure 4 shows a schematic diagram of the power capacitor outputting power to supply power to the battery auxiliary equipment and the battery management system when the power grid cannot supply power, as shown in Figure 4, where C is the capacitance of the power capacitor, and RL is the load (battery auxiliary equipment). and the resistance value of the battery management system), according to the formula Uc=U0*e[-1/(RL*C)], the voltage Uc of the power capacitor decays exponentially, and the decay speed depends on 1/(RL* C), after a RL*C time, the voltage Uc of the power capacitor is attenuated by 63.2%, which is about 36.8% of the original value, so the power supply time of the power capacitor is guaranteed by adjusting the capacitance value C; Figure 5 shows when the power grid When the power supply cannot be supplied, the schematic diagram of the flow battery power supply after the flow battery is started, as shown in Figure 5, the flow battery is equivalent to a constant voltage source, Us is the output voltage of the constant voltage source, Rs is the internal resistance, and C is the The capacitance value of the power capacitor, RL is the resistance value of the load (battery auxiliary equipment and battery management system), then according to the formula Uc=Us*RL/(Rs+RL), since Rs<<RL, Uc≈Us.
与现有技术相比具有如下优点：Compared with the existing technology, it has the following advantages:
1、将电力电容器配套为给液流电池供电的电网失电后的启动电源，保证了液流电池的瞬时启动和后期稳定运行，具有成本低、启动迅速的优点。1. The power capacitor is matched as the starting power supply after the power grid powering the flow battery loses power, which ensures the instantaneous start and stable operation of the flow battery in the later period, and has the advantages of low cost and rapid start.
2、本发明电力电容器的容量只需满足液流电池启动所需时间即可，当液流电池启动后，电池辅助设备供电完全由液流电池自身给电池辅助设备、电池管 理系统和储能逆变器控制器供电，充分利用液流电池电量，提高电池利用率。2. The capacity of the power capacitor of the present invention only needs to meet the time required for the start-up of the flow battery. After the flow battery is started, the power supply of the battery auxiliary equipment is completely supplied by the flow battery itself to the battery auxiliary equipment, the battery management system and the energy storage inverter. The inverter controller supplies power, makes full use of the power of the flow battery, and improves the battery utilization rate.
3、液流电池运行完毕需要进行停机操作时，电堆内的遗留电能首选为电力电容器充电，在消耗电堆内剩余电量的同时满足了电力电容器的容量需求，大大提高了电池效率和利用率。3. When the flow battery needs to be shut down after the operation, the residual electric energy in the stack is firstly used to charge the power capacitor, which can satisfy the capacity requirement of the power capacitor while consuming the remaining power in the stack, and greatly improve the battery efficiency and utilization rate. .
4、与现有技术相比，有效解决了目前钒液流电池无法完全自启动问题。4. Compared with the prior art, it effectively solves the problem that the current vanadium redox flow battery cannot be fully self-started.
另外，考虑到若电池辅助设备和电池管理系统采用交流供电，则液流电池本体即使有电，也无法自启动，本发明电池辅助设备和电池管理系统均采用直流供电，直流母线连接电力电容器，通过电力电容器实现液流电池自启动；与液流电池本体连接的储能逆变器控制器采用直流供电，即储能逆变器控制器的用电经由DC/DC变换器取自储能逆变器直流侧，当储能逆变器直流侧电压满足要求时，储能逆变器正常工作，实现液流电池在完全无交流供电情况下正常工作。In addition, considering that if the battery auxiliary equipment and the battery management system use AC power supply, the flow battery body will not be able to start automatically even if there is electricity. The self-starting of the flow battery is realized by the power capacitor; the energy storage inverter controller connected to the flow battery body adopts DC power supply, that is, the power of the energy storage inverter controller is taken from the energy storage inverter through the DC/DC converter. On the DC side of the inverter, when the DC side voltage of the energy storage inverter meets the requirements, the energy storage inverter works normally, and the flow battery can work normally without AC power supply at all.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.
Claims (9)
Priority Applications (1)
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| CN109037738B (en) * | 2018-07-25 | 2021-03-30 | 合肥工业大学 | Black start method of megawatt all-vanadium redox flow battery system device |
| CN112769242B (en) * | 2020-12-30 | 2022-12-06 | 漳州科华技术有限责任公司 | Energy storage system starting method, device, equipment and system |
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