CN109901079B - Remote capacity checking method and system for storage battery of electric direct-current power supply - Google Patents
Remote capacity checking method and system for storage battery of electric direct-current power supply Download PDFInfo
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Abstract
The invention provides a remote capacity checking method and a remote capacity checking system for a storage battery of a power direct-current power supply. The remote capacity checking method and the remote capacity checking system can obtain the corresponding capacity checking result of the storage battery pack in real time without long-time on-site attendance of workers at a transformer substation, and can effectively utilize energy generated by the storage battery in the capacity checking process.
Description
Technical Field
The invention relates to the technical field of power system storage battery capacity checking, in particular to a remote capacity checking method and system for a storage battery of an electric direct-current power supply.
Background
The power system power supply transformer substation is provided with corresponding power transformer equipment, and is also provided with a direct-current power supply system for supplying power for the control protection equipment, a direct-current power supply system for supplying power for the communication equipment and the like, and the direct-current power supply systems are generally provided with a large number of storage batteries, so that when the mains supply fails to supply power normally due to failure, the storage batteries can be used as a backup power supply to supply power for loads such as the control protection equipment and the communication equipment, the control protection equipment and the communication equipment of the power system can continuously and normally work, and a major power failure accident is avoided. Generally, a dc power supply system for controlling a protection device in a power system supply substation generally uses a storage battery pack in which 55-node 2V storage batteries are connected in series to form 110V, a storage battery pack in which 110-node 2V storage batteries are connected in series to form 220V, or a combination of storage batteries of other specifications, and the like, while a dc power supply system for a communication device in a power system supply substation generally uses a storage battery pack in which 24-node 2V storage batteries are connected in series to form 48V, or a combination of storage batteries of other specifications, and the like.
Although storage batteries are widely used as dc power supply systems for power supply substations of power systems, such storage batteries present different risk problems during use. For example, a storage battery pack is damaged by changes of using environment conditions, which means that various storage batteries respectively have corresponding normal operating environment temperature and humidity ranges, the using environment of the storage battery pack cannot meet the corresponding normal operating condition requirements due to restriction of field conditions of a power system or changes of the environment conditions, and particularly, the storage batteries may have different problems of cracking, increased internal resistance, open circuit of an internal circuit, overheating in operation, reduced storage performance, too low power supply voltage and the like under the condition of overhigh temperature or overlow temperature; the change of the use environment condition can also cause the deterioration of the internal material of the storage battery to cause the damage of the storage battery, and particularly, after the internal material of a certain section of storage battery is deteriorated, the internal material of the storage battery can influence the integral power supply performance of the storage battery in which the storage battery is arranged; in addition, when the number of charging and discharging times of the storage battery reaches the corresponding number of life times, or when the storage battery is overcharged or overdischarged in the use process (namely, the voltage of the storage battery exceeds the upper limit voltage when the storage battery is charged or the voltage of the storage battery exceeds the lower limit voltage when the storage battery is discharged), and other improper use conditions exist, the storage battery can be seriously damaged, and the storage battery cannot normally work. In order to overcome the problem that the capacity of the storage battery pack cannot reach the expected capacity due to the different problems in the using process of the storage battery pack, a power company needs to check whether the capacity of the storage battery pack meets the requirement or not by checking the capacity regularly, generally, the capacity is checked once every two years in the first four years of a new storage battery pack, and the capacity is checked once every year after four years.
Disclosure of Invention
At present, in the operation of checking the capacity of the storage battery, a power company usually adopts a discharge instrument to perform discharge and capacity checking operation on a substation site, and specifically, current constant-current discharge is continuously performed for 10 hours according to the capacity of the storage battery of 0.1C, and then corresponding parameters such as current and voltage are recorded to calculate the capacity of the storage battery. Because general discharge appearance equipment adopts resistive load to generate heat and fan refrigeration heat dissipation, the work heat of discharge appearance equipment can disperse in the inner space of transformer substation, and the work heat of discharge appearance equipment is big to the staff need watch for 10 hours at every transformer substation scene, this very easy emergence heat accident. In addition, the nuclear capacity method described above also has the problem that the heat generated by the operation of the discharge instrument equipment is dissipated into the air, the heat is not fully utilized, and thus the energy is wasted, the staff needs to watch for 10 hours on each substation site, and the number of the substations is huge. It can be seen that the existing method for checking the capacity of the storage battery in the transformer substation is realized on the basis of manual work for a long time one by one, the method for checking the capacity not only costs huge manpower and material resources, but also has huge energy waste in the process of checking the capacity, and the checking capacity efficiency is extremely low, so that the method is not suitable for the construction and maintenance requirements of increasingly developed complete power supply networks.
The invention provides a remote capacity checking method and a remote capacity checking system for a storage battery of a power direct-current power supply, aiming at the defects in the prior art. The remote capacity checking method and the remote capacity checking system can obtain the corresponding capacity checking result of the storage battery pack in real time without long-time on-site attendance of workers at a transformer substation, and can effectively utilize energy generated by the storage battery in the capacity checking process. Therefore, the remote capacity checking method and the remote capacity checking system have the advantages of high capacity checking efficiency, simple operation, safety and reliability, and fully recycle energy, which is obviously superior to the capacity checking mode in the prior art.
The invention provides a remote capacity checking method for a storage battery of an electric direct-current power supply, which is characterized by comprising the following steps of:
detecting and acquiring a first parameter of a storage battery pack, simultaneously acquiring a field video signal and a field sound signal of a place where the storage battery pack is located, transmitting and feeding back the first parameter, the field video signal and the field sound signal, and judging whether the first parameter of the storage battery pack is normal or not according to the first parameter, the field video signal and the field sound signal;
step (2), obtaining a judgment result of whether the first parameter is normal or not, if the first parameter is abnormal, performing repair operation on the storage battery pack, and if the first parameter is normal, performing discharge operation on the storage battery pack and judging whether the discharge operation is normal or not;
step (3), obtaining a judgment result whether the discharging operation is normal or not, if the discharging operation is abnormal, executing replacement operation on the storage battery pack, and if the discharging operation is normal, performing charging operation on the storage battery pack and judging whether the charging operation is normal or not;
step (4), obtaining a judgment result whether the charging operation is normal or not, if the charging operation is abnormal, executing replacement operation on the storage battery pack, and switching on and combining a switch of the storage battery pack into an original running direct current system power grid to finish the remote capacity checking operation of the storage battery pack at present;
further, in the step (1), acquiring a first parameter of the storage battery pack, wherein the first parameter comprises at least one of total voltage, total current, voltage of a single battery, internal resistance and temperature of the storage battery pack; or, the first parameter, the live video signal and the live sound signal are transmitted and fed back through an internal network, and when the internal network is abnormal, the first parameter, the live video signal and the live sound signal are transmitted and fed back through a 4G or 5G standby network;
further, in the step (2), if the first parameter is abnormal, performing repair operation on the storage battery pack and repeating the step (1) again until the first parameter is normal; if the first parameter is normal, the discharging operation specifically comprises the steps of disconnecting a switch corresponding to the storage battery pack, enabling the storage battery pack to be separated from a bus, discharging the electric quantity of the storage battery pack into a power grid through a bidirectional inverter power supply, simultaneously obtaining a second parameter corresponding to the storage battery pack in the discharging process, a field video signal and a field sound signal corresponding to the discharging process, and judging whether the discharging operation is normal or not according to the second parameter, the field video signal and the field sound signal corresponding to the discharging process;
further, in the step (3), if the discharging operation is abnormal, performing a replacement operation on the storage battery pack until the discharging operation is normal; if the discharging operation is normal, the charging operation specifically comprises the steps of closing a switch corresponding to the storage battery pack, enabling the storage battery pack to be connected to a bus, converting alternating current in a power grid into direct current through a bidirectional inversion battery, charging the storage battery pack through the direct current, simultaneously obtaining a third parameter corresponding to the storage battery pack in a charging process, a field video signal and a field sound signal corresponding to the charging process, and judging whether the charging operation is normal or not according to the third parameter, the field video signal and the field sound signal corresponding to the charging process;
further, in the step (4), if the charging operation is abnormal, the storage battery pack is replaced until the charging operation is normal; if the charging operation is normal, determining that the current battery capacity of the storage battery pack meets the requirement of normal work of the storage battery pack;
further, the transmission feedback of the second parameter, the field video signal and the field sound signal corresponding to the discharging process, or the transmission feedback of the third parameter, the field video signal and the field sound signal corresponding to the charging process is transmission feedback through an internal network, and when the internal network is abnormal, the transmission feedback is performed through a 4G or 5G standby network;
the invention also provides a remote capacity checking system for the electric direct-current power supply storage battery, which comprises a remote management control unit, an internal network unit, a storage battery pack control unit, a grid-connected charging and discharging unit, a parameter monitoring unit, a video acquisition unit, an audio acquisition unit and a storage battery pack, and is characterized in that:
the parameter monitoring unit is used for acquiring a first parameter of the storage battery pack, a second parameter corresponding to the storage battery pack in a discharging process and a third parameter corresponding to the storage battery pack in a charging process;
the video acquisition unit is used for acquiring a field video signal of a place where the storage battery pack is located in the process of acquiring the first parameter, a field video signal of a place where the storage battery pack is located in the discharging process and a field video signal of a place where the storage battery pack is located in the charging process;
the audio acquisition unit is used for acquiring a field sound signal of a place where the storage battery pack is located in the process of acquiring the first parameter, a field sound signal of a place where the storage battery pack is located in the discharging process, and a field sound signal of a place where the storage battery pack is located in the charging process;
the internal network unit is used for transmitting and feeding back the first parameter, the second parameter, the third parameter, all the live video signals and all the live sound signals;
the grid-connected charging and discharging unit is used for performing discharging operation or charging operation on the storage battery pack;
the storage battery pack control unit is used for controlling the working states of the grid-connected charging and discharging unit and the parameter monitoring unit;
the remote management control unit is used for controlling the working states of the storage battery pack control unit, the video acquisition unit and the audio acquisition unit;
further, the remote core content system further includes a 4G or 5G standby network unit, and when the internal network unit is abnormal, the 4G or 5G standby network unit is used to replace the internal network unit to perform transmission feedback on the first parameter, the second parameter, the third parameter, all the live video signals, and all the live sound signals;
further, the remote nuclear capacity system also comprises an electric switch unit, wherein the electric switch unit is used for controlling the switching between the storage battery pack and the bus in a closed state or an open state; the grid-connected charging and discharging unit executes the discharging operation specifically comprises that the storage battery pack control unit instructs the electric switch unit to disconnect the storage battery pack from the bus, and meanwhile, the grid-connected charging and discharging unit puts the electric quantity of the storage battery pack into a power grid through a bidirectional inverter power supply in the grid-connected charging and discharging unit; the grid-connected charging and discharging unit executes the charging operation specifically comprises that the storage battery pack control unit instructs the electric switch unit to close the connection between the storage battery pack and the bus, and meanwhile, the grid-connected charging and discharging unit converts alternating current in a power grid into direct current through a bidirectional inverter power supply in the grid-connected charging and discharging unit and charges the storage battery pack with the direct current;
further, the parameter monitoring unit acquires at least one of total voltage, total current, voltage, internal resistance, and temperature of the battery pack as the first parameter, acquires at least one of total voltage, total current, voltage, and temperature of the battery pack during the discharge process as the second parameter, and acquires at least one of total voltage, total current, voltage, and temperature of the battery pack during the charge process as the third parameter.
Compared with the prior art, the storage battery pack in the transformer substation is remotely controlled and monitored, the working parameters of the storage battery pack in different processes such as discharging and charging and the like and the video signals and the sound signals of the transformer substation in different processes are remotely obtained, and corresponding kernel-volume calculation is carried out according to the remotely obtained working parameters, the video signals and the sound signals. The remote capacity checking method and the remote capacity checking system can obtain the corresponding capacity checking result of the storage battery pack in real time without long-time on-site attendance of workers at a transformer substation, and can effectively utilize energy generated by the storage battery pack in the capacity checking process. Therefore, the remote capacity checking method and the remote capacity checking system have the advantages of high capacity checking efficiency, simple operation, safety and reliability, and fully recycle energy, which is obviously superior to the capacity checking mode in the prior art.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a remote capacity checking method for an electric dc power storage battery according to the present invention;
fig. 2 is a schematic structural diagram of a remote capacity checking system for a storage battery of an electric dc power supply according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a remote capacity checking method for a storage battery of an electric dc power supply according to an embodiment of the present invention. The remote capacity checking method for the storage battery of the electric direct-current power supply can comprise the following steps:
the method comprises the steps of (1) detecting and obtaining a first parameter of a storage battery pack, collecting a field video signal and a field sound signal related to a place where the storage battery pack is located, transmitting and feeding back the first parameter, the field video signal and the field sound signal, and judging whether the first parameter of the storage battery pack is normal or not according to the first parameter, the field video signal and the field sound signal.
Preferably, in the step (1), the first parameter of the storage battery pack is acquired and includes at least one of total voltage, total current, voltage of a single battery, internal resistance and temperature of the storage battery pack; or, the first parameter, the live video signal and the live sound signal are transmitted and fed back through an internal network, and when the internal network is abnormal, the first parameter, the live video signal and the live sound signal are transmitted and fed back through a 4G or 5G standby network. In fact, in step (1), by means of collecting multiple information such as parameter data, video signals and sound signals, the state of the storage battery pack is monitored as if a worker is located at a substation site, the real reliability of the field data information is determined through the video signals, so as to avoid the problem of data distortion caused by interference signals, and meanwhile, whether the operation of the field device is executed in place and the real reliability of action execution are determined through the sound signals, and a corresponding remote processing method is convenient to avoid the occurrence of misoperation or no action problem of the field device caused by the interference signals. In addition, the multivariate information can be integrated on a software page, so that remote control personnel can simultaneously obtain different forms of field monitoring information on the software page, and the remote control personnel can conveniently control the corresponding parameter monitoring units, video acquisition units and audio acquisition units to change different working states in real time. Preferably, data communication is performed through the 4G or 5G standby network when an abnormality occurs in the internal network, so that data transmission smoothness of the remote core content method can be effectively ensured.
And (2) acquiring a judgment result of whether the first parameter is normal or not, if the first parameter is abnormal, performing repair operation on the storage battery pack, and if the first parameter is normal, performing discharge operation on the storage battery pack and judging whether the discharge operation is normal or not.
Preferably, in the step (2), if the first parameter is abnormal, performing a repair operation on the storage battery pack and repeating the step (1) again until the first parameter is normal; if the first parameter is normal, the discharging operation specifically comprises the steps of disconnecting a switch corresponding to the storage battery pack, enabling the storage battery pack to be separated from a bus, discharging the electric quantity of the storage battery pack into a power grid through a bidirectional inverter, simultaneously obtaining a second parameter corresponding to the storage battery pack in the discharging process, a field video signal and a field sound signal corresponding to the discharging process, and judging whether the discharging operation is normal or not according to the second parameter, the field video signal and the field sound signal corresponding to the discharging process.
And (3) acquiring a judgment result of whether the discharging operation is normal or not, if so, executing replacement operation on the storage battery pack, and if not, performing charging operation on the storage battery pack and judging whether the charging operation is normal or not.
Preferably, in the step (3), if the discharging operation is abnormal, the replacement operation is performed on the secondary battery pack until the discharging operation is normal; if the discharging operation is normal, the charging operation specifically comprises the steps of closing a switch corresponding to the storage battery pack, enabling the storage battery pack to be connected to a bus, converting alternating current in a power grid into direct current through a bidirectional inversion battery, charging the storage battery pack through the direct current, simultaneously obtaining a third parameter corresponding to the storage battery pack in the charging process, a field video signal and a field sound signal corresponding to the charging process, and judging whether the charging operation is normal or not according to the third parameter, the field video signal and the field sound signal corresponding to the charging process. It can be seen that the bidirectional inversion battery can discharge the electric quantity of the storage battery into the power grid so as to enable the power grid to fully utilize the electric energy and realize the energy conservation, meanwhile, the bidirectional inversion battery can convert the alternating current of the power grid into the direct current to supply power for the storage battery, and the bidirectional inversion battery can not generate heat for the discharging operation and the charging operation of the storage battery, so that a transformer substation is prevented from generating heat accidents and the like, and the operation can also be provided with an intelligent control interface so as to receive a control signal of a remote monitoring center, so that the remote control operation is facilitated.
And (4) acquiring a judgment result of whether the charging operation is normal or not, if so, executing replacement operation on the storage battery pack, and switching on and combining a switch of the storage battery pack into an originally operated direct current system power grid to finish the remote capacity checking operation on the storage battery pack at present.
Preferably, in the step (4), if the charging operation is abnormal, a replacement operation is performed on the secondary battery pack until the charging operation is normal; and if the charging operation is normal, determining that the current battery capacity of the storage battery pack meets the requirement of normal operation of the storage battery pack.
Preferably, the transmission feedback of the second parameter, the live video signal and the live sound signal corresponding to the discharging process, or the transmission feedback of the third parameter, the live video signal and the live sound signal corresponding to the charging process is transmission feedback through an internal network, and when an abnormality occurs in the internal network, the transmission feedback is performed through a 4G or 5G standby network.
Accordingly, referring to fig. 2, a schematic structural diagram of a remote storage capacity verification system for a power dc power supply battery according to an embodiment of the present invention is shown. Preferably, the remote capacity checking system is used for implementing the remote capacity checking method for the electric direct current power supply storage battery as shown in fig. 1. The remote nuclear capacity system can comprise a remote management control unit, an internal network unit, a storage battery pack control unit, a grid-connected charging and discharging unit, a parameter monitoring unit, a video acquisition unit, an audio acquisition unit and a storage battery pack.
Preferably, the parameter monitoring unit is configured to acquire a first parameter of the battery pack, a second parameter corresponding to the battery pack in a discharging process, and a third parameter corresponding to the battery pack in a charging process.
Preferably, the video acquisition unit is configured to acquire a field video signal of a location where the storage battery pack is located in a process of acquiring the first parameter, a field video signal of a location where the storage battery pack is located in a process of discharging, and a field video signal of a location where the storage battery pack is located in a process of charging.
Preferably, the audio acquisition unit is configured to acquire a field sound signal of a location where the battery pack is located in a process of acquiring the first parameter, a field sound signal of a location where the battery pack is located in a process of discharging, and a field sound signal of a location where the battery pack is located in a process of charging.
Preferably, the internal network unit is configured to transmit feedback of the first parameter, the second parameter, the third parameter, all the live video signals, and all the live sound signals.
Preferably, the grid-connected charge and discharge unit is configured to perform a discharge operation or a charge operation on the secondary battery pack.
Preferably, the storage battery pack control unit is used for controlling the working states of the grid-connected charging and discharging unit and the parameter monitoring unit.
Preferably, the remote management control unit is used for controlling the working states of the storage battery pack control unit, the video acquisition unit and the audio acquisition unit.
Preferably, the remote core content system further comprises a 4G or 5G standby network unit, and when the internal network unit is abnormal, the 4G or 5G standby network unit is configured to transmit and feed back the first parameter, the second parameter, the third parameter, all the live video signals and all the live audio signals instead of the internal network unit.
Preferably, the remote nuclear capacity system further comprises an electric switch unit, wherein the electric switch unit is used for controlling the switching between the storage battery pack and the bus in a closed state or an open state; the grid-connected charging and discharging unit executes the discharging operation specifically comprises that the storage battery pack control unit instructs the electric switch unit to disconnect the storage battery pack from the bus, and meanwhile, the grid-connected charging and discharging unit puts the electric quantity of the storage battery pack into a power grid through a bidirectional inverter power supply in the grid-connected charging and discharging unit; the grid-connected charging and discharging unit executes the charging operation specifically comprises that the storage battery pack control unit instructs the electric switch unit to close the connection between the storage battery pack and the bus, and meanwhile, the grid-connected charging and discharging unit converts alternating current in a power grid into direct current through a bidirectional inverter power supply in the grid-connected charging and discharging unit and charges the storage battery pack through the direct current.
Preferably, the parameter monitoring unit acquires at least one of total voltage, total current, voltage, internal resistance and temperature of the battery pack as the first parameter, acquires at least one of total voltage, total current, voltage and temperature of a single battery of the battery pack in the discharging process as the second parameter, and acquires at least one of total voltage, total current, voltage and temperature of a single battery of the battery pack in the charging process as the third parameter; or after the storage battery pack finishes discharging or charging, simultaneously acquiring the voltage, the internal resistance or the temperature of each battery in the storage battery pack as corresponding monitoring parameters.
Preferably, for different parameters obtained from the storage battery pack, whether the different parameters are normal or not can be judged according to the field video signal and the field sound signal; when determining whether the first parameter is normal, the process of determining that the first parameter is normal can be implemented based on the following equation by determining whether the first parameter exceeds the maximum value of the battery pack acceptable for the first parameter (such as the sum of voltages) or is lower than the minimum value of the battery pack acceptable for the first parameter, and whether the first parameter has a small difference from the return value corresponding to the previous time
Vmin≤vt≤Vmax and|1-vt/vt-1|≤0.1
In the above equation, vtThe voltage value v corresponding to the first parameter returned at the current momentt-1A voltage value V corresponding to the first parameter returned at the previous momentmaxMaximum voltage value, V, acceptable for the battery packminIs the minimum voltage value acceptable for the battery pack.
When judging whether the second parameter and the third parameter are normal, the change conditions of the corresponding parameters in the combined charging process and the discharging process of the storage battery need to be considered; wherein, the calculation process of the theoretical voltage value returned by each battery in the charging process and the discharging process of the storage battery pack is as follows
S＝rt/rs
v＝vt-1+dvt
In the above calculation process, rtMeasured internal resistance, r, for each cell before the start of the charging or discharging processsIs the nominal internal resistance value, C, of each cellsThe theoretical capacity of each battery before the charging process or the discharging process is started, and t is the costThe total times of voltage value data return in the sub-charging process or the current discharging process, delta t is the time interval of two adjacent current value data returns, v is the theoretical voltage value returned at the current momentt-1The voltage value corresponding to the first parameter returned at the previous moment, i is the working current of the DC storage battery pack, S, Cs1、Ct、ii、dvtAre all intermediate parameters.
When the second parameter and the third parameter are judged and determined to be abnormal, comparing a theoretical voltage value obtained by calculation in the charging process and the discharging process of the storage battery with voltage value data obtained by returning, judging whether the current charging process and the current discharging process are normal or not by the following abnormal comparison formula as the situation that the theoretical voltage value obtained by calculation is different from the actual voltage value due to the fact that abnormality occurs in the last time period in the returning process of the voltage value data possibly exists, and determining that the current charging process and the current discharging process are normal if the following abnormal comparison formula is met
|vt-(v+vt-1)/2|<0.1*(v+vt-1)/2
In the above abnormal comparison formula, v is a theoretical voltage value returned at the current time, vtThe voltage value v corresponding to the first parameter returned at the current momentt-1The voltage value corresponding to the first parameter returned at the previous moment.
The above-described judgment process not only fully considers whether the abnormal condition is processed at the last moment, but also defines the specific method involved in the abnormal condition judgment processing, so that the abnormal judgment at each moment is not required to be manually carried out, the time cost of the abnormal judgment is saved, and the influence of artificial subjective factors on the abnormal judgment is reduced.
The working process and function of the different internal functional units in the remote core content system can refer to the working process mentioned above with respect to the remote core content method, and repeated description thereof is omitted here.
It can be seen from the above embodiments that, by remotely controlling and monitoring the storage battery pack in the substation, and remotely acquiring the operating parameters of the storage battery pack in different processes such as discharging and charging and the video signals and sound signals of the substation site in the different processes, corresponding kernel capacity calculation is performed according to the remotely acquired operating parameters, video signals and sound signals. The remote capacity checking method and the remote capacity checking system can obtain the corresponding capacity checking result of the storage battery pack in real time without long-time on-site attendance of workers at a transformer substation, and can effectively utilize energy generated by the storage battery pack in the capacity checking process. Therefore, the remote capacity checking method and the remote capacity checking system have the advantages of high capacity checking efficiency, simple operation, safety and reliability, and fully recycle energy, which is obviously superior to the capacity checking mode in the prior art.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A remote capacity checking method for an electric direct current power supply storage battery is characterized by comprising the following steps:
detecting and acquiring a first parameter of a storage battery pack, simultaneously acquiring a field video signal and a field sound signal of a place where the storage battery pack is located, transmitting and feeding back the first parameter, the field video signal and the field sound signal, and judging whether the first parameter of the storage battery pack is normal or not according to the first parameter, the field video signal and the field sound signal;
step (2), obtaining a judgment result of whether the first parameter is normal or not, if the first parameter is abnormal, performing repair operation on the storage battery pack, and if the first parameter is normal, performing discharge operation on the storage battery pack and judging whether the discharge operation is normal or not;
step (3), obtaining a judgment result whether the discharging operation is normal or not, if the discharging operation is abnormal, executing replacement operation on the storage battery pack, and if the discharging operation is normal, performing charging operation on the storage battery pack and judging whether the charging operation is normal or not;
step (4), obtaining a judgment result whether the charging operation is normal or not, if the charging operation is abnormal, executing replacement operation on the storage battery pack, and switching on and combining a switch of the storage battery pack into an original running direct current system power grid to finish the remote capacity checking operation of the storage battery pack at present;
in the step (2), if the first parameter is abnormal, performing repair operation on the storage battery pack and repeating the step (1) again until the first parameter is normal; if the first parameter is normal, the discharging operation specifically comprises the steps of disconnecting a switch corresponding to the storage battery pack, enabling the storage battery pack to be separated from a bus, discharging the electric quantity of the storage battery pack into a power grid through a bidirectional inverter power supply, simultaneously obtaining a second parameter corresponding to the storage battery pack in the discharging process, a field video signal and a field sound signal corresponding to the discharging process, and judging whether the discharging operation is normal or not according to the second parameter, the field video signal and the field sound signal corresponding to the discharging process;
in the step (3), if the discharging operation is abnormal, performing replacement operation on the storage battery pack until the discharging operation is normal; if the discharging operation is normal, the charging operation specifically comprises the steps of closing a switch corresponding to the storage battery pack, enabling the storage battery pack to be connected to a bus, converting alternating current in a power grid into direct current through a bidirectional inversion battery, charging the storage battery pack through the direct current, simultaneously obtaining a third parameter corresponding to the storage battery pack in a charging process, a field video signal and a field sound signal corresponding to the charging process, and judging whether the charging operation is normal or not according to the third parameter, the field video signal and the field sound signal corresponding to the charging process;
when determining whether the first parameter is normal, only by determining whether the first parameter exceeds the maximum value of the battery pack acceptable for the first parameter or is lower than the minimum value of the battery pack acceptable for the first parameter, and whether the first parameter has a small difference from the return value corresponding to the previous time, the process of determining that the first parameter is normal can be implemented based on the following equation
Vmin≤vt≤Vmax and |1-vt/vt-1|≤0.1
In the above equation, vtThe voltage value v corresponding to the first parameter returned at the current momentt-1A voltage value V corresponding to the first parameter returned at the previous momentmaxMaximum voltage value, V, acceptable for the battery packminA minimum voltage value acceptable for the battery pack;
when judging whether the second parameter and the third parameter are normal, the change conditions of the corresponding parameters in the combined charging process and the discharging process of the storage battery need to be considered; wherein, the calculation process of the theoretical voltage value returned by each battery in the charging process and the discharging process of the storage battery pack is as follows
S＝rt/rs
v＝vt-1+dvt
In the above calculation process, rtFor charging or dischargingMeasured internal resistance, r, for each cell before the start of the electrical processsIs the nominal internal resistance value, C, of each cellsThe theoretical capacity of each battery before the charging process or the discharging process is started, t is the total number of times of voltage value data return in the charging process or the discharging process, delta t is the time interval of two adjacent current value data return, v is the theoretical voltage value returned at the current momentt-1The voltage value corresponding to the first parameter returned at the previous moment, i is the working current of the direct current storage battery pack, S, Cs1、Ct、ii、dvtAre all intermediate parameters;
when the second parameter and the third parameter are judged and determined to be abnormal, comparing a theoretical voltage value obtained by calculation in the charging process and the discharging process of the storage battery with voltage value data obtained by returning, judging whether the current charging process and the current discharging process are normal or not by the following abnormal comparison formula as the situation that the theoretical voltage value obtained by calculation is different from the actual voltage value due to the fact that abnormality occurs in the last time period in the returning process of the voltage value data possibly exists, and determining that the current charging process and the current discharging process are normal if the following abnormal comparison formula is met
|vt-(v+vt-1)/2|<0.1*(v+vt-1)/2
In the above abnormal comparison formula, v is a theoretical voltage value returned at the current time, vtThe voltage value v corresponding to the first parameter returned at the current momentt-1The voltage value corresponding to the first parameter returned at the previous moment.
2. The remote capacity check method for the storage battery of the electric direct current power supply according to claim 1, wherein: in the step (1), acquiring a first parameter of a storage battery pack, wherein the first parameter comprises at least one of total voltage, total current, voltage, internal resistance and temperature of a single battery of the storage battery pack; or, the first parameter, the live video signal and the live sound signal are transmitted and fed back through an internal network, and when the internal network is abnormal, the first parameter, the live video signal and the live sound signal are transmitted and fed back through a 4G or 5G standby network.
3. The remote capacity check method for the storage battery of the electric direct current power supply according to claim 1, wherein: in the step (4), if the charging operation is abnormal, replacing the storage battery pack until the charging operation is normal; and if the charging operation is normal, determining that the current battery capacity of the storage battery pack meets the requirement of normal operation of the storage battery pack.
4. The remote capacity check method for the storage battery of the electric direct current power supply according to claim 1, wherein: the transmission feedback of the second parameter, the field video signal and the field sound signal corresponding to the discharging process, or the transmission feedback of the third parameter, the field video signal and the field sound signal corresponding to the charging process is transmission feedback through an internal network, and when the internal network is abnormal, the transmission feedback is performed through a 4G or 5G standby network.
5. A remote capacity checking system for implementing the remote capacity checking method for the storage battery of the electric direct current power supply according to any one of claims 1 to 4, wherein the remote capacity checking system comprises a remote management control unit, an internal network unit, a storage battery pack control unit, a grid-connected charging and discharging unit, a parameter monitoring unit, a video acquisition unit, an audio acquisition unit and a storage battery pack, and is characterized in that:
the parameter monitoring unit is used for acquiring a first parameter of the storage battery pack, a second parameter corresponding to the storage battery pack in a discharging process and a third parameter corresponding to the storage battery pack in a charging process;
the video acquisition unit is used for acquiring a field video signal of a place where the storage battery pack is located in the process of acquiring the first parameter, a field video signal of a place where the storage battery pack is located in the discharging process and a field video signal of a place where the storage battery pack is located in the charging process; the audio acquisition unit is used for acquiring a field sound signal of a place where the storage battery pack is located in the process of acquiring the first parameter, a field sound signal of a place where the storage battery pack is located in the discharging process, and a field sound signal of a place where the storage battery pack is located in the charging process; the internal network unit is used for transmitting and feeding back the first parameter, the second parameter, the third parameter, all the live video signals and all the live sound signals;
the grid-connected charging and discharging unit is used for performing discharging operation or charging operation on the storage battery pack; the storage battery pack control unit is used for controlling the working states of the grid-connected charging and discharging unit and the parameter monitoring unit;
the remote management control unit is used for controlling the working states of the storage battery pack control unit, the video acquisition unit and the audio acquisition unit.
6. The remote nuclear capacity system of claim 5, wherein: the remote core content system further comprises a 4G or 5G standby network unit, and when the internal network unit is abnormal, the 4G or 5G standby network unit is used for replacing the internal network unit to transmit and feed back the first parameter, the second parameter, the third parameter, all the live video signals and all the live sound signals.
7. The remote nuclear capacity system of claim 5, wherein: the remote nuclear capacity system also comprises an electric switch unit, wherein the electric switch unit is used for controlling the switching between the storage battery pack and the bus in a closed state or an open state; the grid-connected charging and discharging unit executes the discharging operation specifically comprises that the storage battery pack control unit instructs the electric switch unit to disconnect the storage battery pack from the bus, and meanwhile, the grid-connected charging and discharging unit puts the electric quantity of the storage battery pack into a power grid through a bidirectional inverter power supply in the grid-connected charging and discharging unit; the grid-connected charging and discharging unit executes the charging operation specifically comprises that the storage battery pack control unit instructs the electric switch unit to close the connection between the storage battery pack and the bus, and meanwhile, the grid-connected charging and discharging unit converts alternating current in a power grid into direct current through a bidirectional inverter power supply in the grid-connected charging and discharging unit and charges the storage battery pack through the direct current.
8. The remote nuclear capacity system of claim 5, wherein: the parameter monitoring unit acquires at least one of total voltage, total current, voltage, internal resistance and temperature of the storage battery pack as the first parameter, acquires at least one of total voltage, total current, voltage and temperature of the single battery pack in the discharging process of the storage battery pack as the second parameter, and acquires at least one of total voltage, total current, voltage and temperature of the single battery pack in the charging process of the storage battery pack as the third parameter.
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