CN113872264A - Charging monitoring device and direct current charging system - Google Patents

Charging monitoring device and direct current charging system Download PDF

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Publication number
CN113872264A
CN113872264A CN202110961574.5A CN202110961574A CN113872264A CN 113872264 A CN113872264 A CN 113872264A CN 202110961574 A CN202110961574 A CN 202110961574A CN 113872264 A CN113872264 A CN 113872264A
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China
Prior art keywords
charging
state
frequency
unit
current
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CN113872264B (en
Inventor
杜旭浩
李秉宇
贾伯岩
苗俊杰
李博
赵俊蕾
邢超
郭小凡
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—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
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a charging monitoring device and a direct current charging system, wherein the charging monitoring device is used for being connected with a high-frequency type charging device, and the high-frequency type charging device comprises a plurality of charging modules which are connected in parallel between an alternating current power supply and an output end direct current bus; the charge monitoring device includes: the device comprises a collecting unit, a processing unit and a control unit; the acquisition unit is used for acquiring the output current of each charging module in the starting state and sending the output current to the processing unit; the processing unit is used for calculating the average current load ratio of the high-frequency type charging device and sending a first control instruction to the control unit when the average current load ratio is lower than a first preset threshold value; the control unit is used for adjusting one or more charging modules in the starting state to a hot standby state according to a first control instruction so that the average current load ratio of the adjusted high-frequency type charging device is in a preset interval. Through carrying out corresponding adjustment to each module of charging when average current load ratio is undersize, can avoid each module of charging low load operation trouble that leads to.

Description

Charging monitoring device and direct current charging system
Technical Field
The application belongs to the technical field of electric power systems, and particularly relates to a charging monitoring device and a direct-current charging system.
Background
The direct-current power supply system is an important component of a power plant and a transformer substation power supply system, and has important influence on safe operation of a power grid and stable development of the country. The power supply of the direct current power supply system mainly comprises a rectifying charging device and a storage battery pack. Under normal conditions, the DC power supply system supplies power to a DC load through a rectification charging device by a station AC power supply and simultaneously charges a storage battery pack.
The high-frequency charging device is a rectifying charging device which adopts a power semiconductor device as a high-frequency conversion switch, is isolated by a high-frequency transformer and converts alternating current into direct current. A high-frequency type charging device is used in an electric dc power supply system for charging a secondary battery and supplying dc power. In order to ensure stable operation of the power dc power supply system, the high-frequency charging device needs to be overhauled.
At present, the high-frequency charging device is usually overhauled in a manual regular inspection and overhaul mode. However, the monitoring of the high-frequency charging device by this maintenance method is weak, and the failure rate of the high-frequency charging device is high.
Disclosure of Invention
In view of this, the present invention provides a charging monitoring device and a dc charging system, and aims to solve the problem of high failure rate of a high-frequency charging device.
A first aspect of an embodiment of the present invention provides a charging monitoring apparatus, where the charging monitoring apparatus is configured to be connected to a high-frequency charging apparatus, where the high-frequency charging apparatus includes a plurality of charging modules, and the plurality of charging modules are connected in parallel between an ac power supply and an output-side dc bus; the charge monitoring device includes: the device comprises a collecting unit, a processing unit and a control unit;
the acquisition unit is used for acquiring the output current of each charging module in a starting state and sending the output current to the processing unit;
the processing unit is used for calculating the average current load ratio of the high-frequency type charging device; when the average current load ratio is lower than a first preset threshold value, sending a first control instruction to the control unit;
the control unit is configured to adjust one or more charging modules in an enabled state to a hot standby state according to the first control instruction, so that the average current-to-load ratio of the adjusted high-frequency charging device is within a preset interval, where a lower limit value of the preset interval is greater than or equal to a first preset threshold value.
A second aspect of an embodiment of the present invention provides a dc charging system, including: at least one charge monitoring device as described above in the first aspect and at least one high-frequency type charging device; wherein each charging monitoring device is connected with one high-frequency type charging device; each high-frequency charging device is respectively connected with an alternating current power supply; each high-frequency charging device is connected with an output end direct current bus.
According to the charging monitoring device and the direct-current charging system provided by the embodiment of the invention, the charging monitoring device is connected with a high-frequency type charging device, the high-frequency type charging device comprises a plurality of charging modules, and the plurality of charging modules are connected between an alternating-current power supply and an output end direct-current bus in parallel; the charge monitoring device includes: the device comprises a collecting unit, a processing unit and a control unit; the acquisition unit is used for acquiring the output current of each charging module in the starting state and sending the output current to the processing unit; a processing unit for calculating an average current load ratio of the high-frequency type charging device; when the average current load ratio is lower than a first preset threshold value, a first control instruction is sent to the control unit; and the control unit is used for adjusting one or more charging modules in the starting state to a hot standby state according to a first control instruction so as to enable the average current load ratio of the adjusted high-frequency charging device to be in a preset interval, wherein the lower limit value of the preset interval is greater than or equal to a first preset threshold value. Through carrying out corresponding adjustment to each charging module in the high-frequency charging device when the average current load ratio is too small, the fault caused by long-term low-load operation of each charging module can be avoided, and the service life of the high-frequency charging device is effectively prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a charge monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charge monitoring device according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a dc charging system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dc charging system according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of two high-frequency charging devices in a dc charging system according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The direct-current power supply system is an important component of power supply systems of power plants and substations and provides reliable power supply for secondary systems and equipment of the power plants, such as relay control protection devices, automatic control devices, breaker switching-on and switching-off mechanisms, metering, communication, emergency lighting and the like. With the continuous construction and development of modern large-scale power engineering such as large-unit power plants, extra-high voltage substations and the like, the direct-current power supply system serving as a power supply pulse of the large-scale plant station has important influence on the safe operation of a power grid and the stable development of the state. The power supply of the direct current power supply system mainly comprises a rectifying charging device and a storage battery pack, and under the normal condition, the direct current power supply system supplies power to a direct current load through an alternating current power supply for a station through the rectifying charging device and simultaneously supplies floating charge to the storage battery pack. The charging device is one of the most core components in a station direct-current power supply system, and is an important guarantee for the safe and stable operation of the station system.
The high-frequency charging device is a power conversion device which adopts a power semiconductor device as a high-frequency conversion switch, is isolated by a high-frequency transformer and converts alternating current into direct current. In an electric dc power supply system for charging a battery and supplying dc power. In recent years, high frequency type charging devices have been the first choice for power dc power systems because of their relatively advanced technology, good performance and redundant configuration of charging modules, and phase control type charging devices have been eliminated.
According to the scale and the voltage grade of a plant station, the power supply mode configuration of the direct-current power supply system is mainly divided into single-storage single-charging, double-storage double-charging and double-storage three-charging. The single-storage single-charging power supply mode, namely a direct-current power supply system, adopts a single bus to supply power, and is provided with a set of high-frequency charging device and a group of storage batteries, wherein the set of high-frequency charging device is formed by connecting a plurality of high-frequency charging modules of the same type in parallel and supplies power for the direct-current bus. One set of high-frequency charging device is provided with a main alternating current power supply and a standby alternating current power supply, and an alternating current switching device is adopted at an alternating current main inlet wire to carry out switching between the main alternating current power supply and the standby alternating current power supply. The double-storage double-charging power supply mode, namely a direct-current power supply system adopts a two-section single-bus power supply mode, each section of bus is provided with one set of high-frequency charging device and one set of storage battery, and the configuration condition of the charging device of each section of bus is the same as that of the single-storage single-charging power supply mode. The double-storage three-charging power supply mode is characterized in that a set of standby high-frequency charging device is additionally arranged on the basis of the double-storage double-charging power supply mode and is used as a standby mode for maintenance and fault.
Although the high-frequency type charging device improves the power supply reliability of the power direct-current power supply system, from practical operation experience, the following problems still exist in the current power supply mode, and the reliable operation of the high-frequency type charging device is restricted. Firstly, in order to improve the power supply reliability, each set of high-frequency charging device is provided with a main alternating-current power supply and a standby alternating-current power supply, but in actual operation and maintenance, when the main alternating-current power supply loses power, the standby alternating-current power supply cannot be timely and correctly put into use because the alternating-current switching device fails or is not switched in place, and therefore the whole set of high-frequency charging device loses power. Secondly, although each set of charging device is formed by connecting a plurality of high-frequency charging modules of the same type in parallel in a redundant configuration mode, each high-frequency charging module in most of the existing electric power engineering is not provided with an independent incoming line breaker, so that the power of the whole set of high-frequency charging device is required to be cut off when a single module fails or is put on or off for maintenance. At present, each high-frequency charging module is additionally provided with an incoming line breaker. However, when the module is in failure or is switched on and off, manual operation is still needed, and the automatic switching-on and off function is lacked. And thirdly, the charging module active alternation switching operation and maintenance strategy is lacked, so that the charging module of the main charging device runs for a long time, the charging module of the standby charging device is placed for a long time, and the standby charging device can only be manually switched on, which is not beneficial to the overall healthy running of the charging device. Fourthly, the input and output of the charging module cannot be effectively monitored and the fault alarm cannot be realized.
In order to solve the problems, the invention provides a charging monitoring device and a direct current charging system, which realize intelligent switching of a single or a plurality of charging modules, online monitoring and fault warning of incoming and outgoing lines of the charging modules, and improve the service life and power supply stability of a high-frequency direct current charging device.
Fig. 1 is a schematic structural diagram of a charge monitoring device according to an embodiment of the present invention. As shown in fig. 1, the charge monitoring apparatus 1 is used for connecting with a high-frequency type charging apparatus including a plurality of charging modules connected in parallel between an ac power supply and an output terminal dc bus. The charge monitoring device 1 includes: acquisition unit 11, processing unit 12, control unit 13.
The collecting unit 11 is configured to collect an output current of each charging module in the enabled state, and send the output current to the processing unit 12.
A processing unit 12 for calculating an average current load ratio of the high-frequency type charging device; and sends a first control instruction to the control unit 13 when the average current-to-load ratio is lower than a first preset threshold.
The control unit 13 is configured to adjust one or more charging modules in an enabled state to a hot standby state according to a first control instruction, so that the average current-to-load ratio of the adjusted high-frequency charging device is within a preset interval, where a lower limit value of the preset interval is greater than or equal to a first preset threshold value.
In this embodiment, the collecting unit 11 may collect voltage and current data of any node in the high-frequency charging device. Each charging module may be a high-frequency dc conversion device, or may be a high-frequency dc charger, which is not limited herein. The output voltage of each charging module can be adjusted. Optionally, the first preset threshold may be 0.2. Adjusting the charging module in the starting state to a hot standby state as follows: and reducing the output voltage of the charging module to make the output voltage of the charging module smaller than the voltage of the direct current bus at the output end, and stopping the output of the output module at the moment. When the charging module is adjusted to the hot standby state, the original operation load of the charging module is borne by other charging modules in the starting state. When the charging module is in a hot standby state, the charging module does not participate in power supply, but does not exit from the circuit, and can be started quickly at any time. Alternatively, the preset interval may be [0.3, 0.6 ]. When the charging module operates in the preset interval, the charging module has a stable working state and a long service life.
In this embodiment, the charging monitoring device 1 is used to connect with a high-frequency charging device, the high-frequency charging device includes a plurality of charging modules, and the plurality of charging modules are connected in parallel between an ac power supply and an output end dc bus; the charge monitoring device 1 includes: the device comprises a collecting unit 11, a processing unit 12 and a control unit 13; the acquisition unit 11 is configured to acquire an output current of each charging module in an enabled state, and send the output current to the processing unit 12; a processing unit 12 for calculating an average current load ratio of the high-frequency type charging device; and when the average current-to-load ratio is lower than a first preset threshold, sending a first control instruction to the control unit 13; the control unit 13 is configured to adjust one or more charging modules in an enabled state to a hot standby state according to a first control instruction, so that the average current-to-load ratio of the adjusted high-frequency charging device is within a preset interval, where a lower limit value of the preset interval is greater than or equal to a first preset threshold value. Through carrying out corresponding adjustment to each charging module in the high-frequency charging device when the average current load ratio is too small, the fault caused by long-term low-load operation of each charging module can be avoided, and the service life of the high-frequency charging device is effectively prolonged.
In some embodiments, the acquisition unit 11 is respectively connected to each charging module of the high-frequency charging device and the processing unit 12; the control unit 13 is connected to each charging module of the high-frequency charging device and the processing unit 12.
The average current load ratio is the ratio of the sum of the output currents of each charging module in the activated state to the sum of the rated currents.
In the present embodiment, the expression of the average current load ratio is as follows:
Figure BDA0003222217370000051
wherein, FAverageFor the average current-to-load ratio, Ialways is the sum of the output currents of each charging module in the active state, n is the total number of the charging modules in the high-frequency type charging device, x is the number of the charging modules in the hot standby state, and INIs the rated current of the charging module.
In some embodiments, the processing unit 12 is specifically configured to send a first control instruction to the control unit 13 in each voltage limiting period when the average current-to-load ratio is lower than a first preset threshold.
A processing unit 12, further configured to: after each voltage limiting period is finished, the control unit 13 adjusts all the charging modules in the hot standby state to the starting state, and enters the next voltage limiting period.
In this embodiment, the voltage limiting period may be adjusted according to actual requirements. Alternatively, the voltage limiting period may be set to 7 days.
In the embodiment, by adopting the voltage limiting period, each charging module can be in standby rest alternately in each voltage limiting period, and the service life of the charging module can be effectively prolonged.
In some embodiments, the acquiring unit 11 is further configured to acquire the temperature value of each charging module in the activated state and send the temperature value to the processing unit 12.
The processing unit 12 is further configured to calculate, for each charging module in the enabled state, a current load ratio of the charging module; the current load ratio is a ratio of the output current to the rated current.
And determining a first priority of the charging module in the enabled state according to the temperature value, wherein the higher the temperature value is, the higher the first priority is. And if the charging modules with the same first priority exist, determining a second priority of the charging modules with the same first priority according to the current load ratio, wherein the larger the current load ratio is, the higher the second priority is.
The processing unit 12 is specifically configured to sequentially select one or more charging modules in an enabled state as charging modules to be adjusted according to the first priority and the second priority of each charging module, and the control unit 13 adjusts the charging modules to be adjusted to a hot standby state, so that the average current load ratio of the adjusted high-frequency charging device is within a preset interval.
In this embodiment, the second priority may be a sub-level of the first priority. For example, if the numbers of the first priorities are 1, 2, 3, …, n, and the smaller the number of the first priority is, the higher the priority is, the number of a certain group of second priorities may be 2.1, 2.2, 2.3, and the adjustment order of the modules to be adjusted is: 1. 2.1, 2.2, 2.3, 3, …, n.
In some embodiments, the processing unit is further configured to determine, according to the size of the temperature value, a first serial number of the charging module in the enabled state; and determining a second serial number of the charging module in the starting state according to the current load ratio.
And the processing unit is specifically used for sequentially selecting one or more charging modules in an enabled state as charging modules to be adjusted according to the weighted sum of the first serial number and the second serial number from small to large, and the control unit is used for adjusting the charging modules to be adjusted to a hot standby state so that the average current load ratio of the adjusted high-frequency charging device is within a preset interval.
In this embodiment, the smaller the temperature, the smaller the first number. The smaller the current duty ratio, the smaller the second order number. The expression for the weighted sum is as follows:
W＝n1·α+n2·β (2)
wherein W is a weighted sum, n1Is the first serial number, n2Is the second sequence number, a is the weight of the first sequence number, and β is the weight of the second sequence number.
In this embodiment, through the charging module that the preferential adjustment temperature is high, current load ratio is little, can prevent effectively that the module of charging is overheated and high load operation, can effectively reduce the fault rate of the module of charging, improve the life of the module of charging, improve the power supply stability of the module of charging.
In some embodiments, the processing unit 12 is further configured to send a second control instruction to the control unit 13 when the average current-to-load ratio is higher than a third preset threshold.
The control unit 13 is further configured to adjust one or more charging modules in a hot standby state to an enabled state according to a second control instruction, so that the average current-to-load ratio of the adjusted high-frequency charging device is within a preset interval, where an upper limit value of the preset interval is less than or equal to a third preset threshold.
In this embodiment, through carrying out corresponding adjustment to charging device when average current load ratio is too high, can effectively prevent to charge the power supply unstability and the trouble that the module lasts high load operation and causes, effectively improve the life and the power supply stability of the module of charging.
In some embodiments, the processing unit 12 is further specifically configured to obtain an already-running time length of each charging module in the enabled state, and determine the second priority according to the already-running time length;
if the average current load ratio is higher than the third preset threshold, the control unit 13 adjusts one or more charging modules in the hot standby state to the enabled state according to the second priority, so that the average current load ratio of the adjusted high-frequency charging device is within the preset interval.
In this embodiment, by determining the adjustment sequence of the charging modules according to the running time, it can be avoided that the current output by the charging module and the current output by other modules are unbalanced and the power supply stability is affected due to the fact that a certain charging module has too long service time relative to other charging modules.
Fig. 2 is a schematic structural diagram of a charge monitoring device according to another embodiment of the present invention. As shown in fig. 2, in some embodiments, the charge monitoring device 1 further comprises an alarm unit 14. The alarm unit 14 is connected to the processing unit 12.
The collecting unit 11 is further configured to collect an output current of the ac power supply and an output current of the output terminal dc bus.
A processing unit 12, further configured to perform at least one of the following implementations:
in a possible implementation manner, the processing unit 12 determines that the charging module in the enabled state is abnormal when a preset condition is met in each preset voltage limiting period, controls the alarm unit 14 to send an abnormal alarm signal, controls the control unit 13 to adjust the abnormal charging module to the quit state, adjusts all the charging modules in the hot standby state except the abnormal charging module to the enabled state, and enters the next voltage limiting period; the preset conditions comprise that the output current of the alternating current power supply and the output current of the output end direct current bus are both normal values, the output current of the charging module in the starting state is zero, and the output voltage of the charging module cannot be adjusted.
In a possible implementation manner, the processing unit 12 calculates, in each preset voltage limiting period, a current sharing imbalance of each charging module in the enabled state; if the charging module with the current-sharing unbalance degree exceeding the preset unbalance degree range exists, the control alarm unit 14 sends out an unbalance alarm signal, the control unit 13 adjusts all the charging modules in the hot standby state to the starting state, the next voltage limiting period is entered, and the control unit 13 is controlled to adjust the state of the charging module with the highest current-sharing unbalance degree to the hot standby state or the quitting state in the next voltage limiting period.
In a possible implementation manner, in each preset voltage limiting period, if the temperature value of the charging module in the enabled state is greater than the second preset threshold value, the processing unit 12 controls the alarm unit 14 to send an overheat alarm signal, controls the control unit 13 to adjust all the charging modules in the hot standby state to the enabled state, enters a next voltage limiting period, and controls the control unit 13 to adjust the state of the charging module with the highest temperature value to the hot standby state or the quit state in the next voltage limiting period.
In this embodiment, adjusting the charging module to the exit state may be disconnecting the incoming line breaker of the charging module. After the charging module is withdrawn, the charging module can be conveniently checked by a maintainer. The expression of the current sharing unbalance degree of the charging module in the activated state is as follows:
Figure BDA0003222217370000071
wherein, the ECUiFor each charging module in the active state, equalizing the current imbalance, IiFor the output current, I, of each charging module in the activated stateAverageFor the levelling of the output currents of the individual charging modules in the active stateAnd (4) average value.
Alternatively, the predetermined unbalance interval may be [ -5%, 5% ]. Optionally, the second preset threshold may be 60 degrees celsius.
In this embodiment, by correspondingly controlling the abnormal charging module (for example, short circuit of the charging module), the influence of the abnormality of the single charging module on the high-frequency charging device can be effectively prevented, and the power supply stability is effectively improved. Through the unbalance degree of flow equalizing of monitoring each module of charging, can prevent effectively that single module of charging from transshipping the damage, improve the life of the module of charging, can also prevent that the power supply quality of the output direct current generating line that each module of charging output current difference caused from becoming low. Through the temperature of monitoring each module of charging, can effectively prevent the overheated damage of the module of charging, improve life.
In some embodiments, the charge monitoring device further comprises a status monitoring unit 15 and/or a storage unit 16. The condition monitoring unit 15 is connected to the processing unit 12. The storage unit 16 is connected to the processing unit 12.
And the state monitoring unit 15 is used for monitoring the operating state of each charging module and sending the operating state to the processing unit 12.
The processing unit 12 is further configured to control the alarm unit 14 to send a state switching abnormal alarm signal if there is a situation that the operating state of the charging module cannot be switched.
And the storage unit is used for storing the operation data and the fault data of each charging module sent by the processing unit.
In this embodiment, the state monitoring unit 15 is specifically configured to monitor the on-off condition of the incoming line breaker corresponding to each charging module, and if the incoming line breaker fails, the control alarm unit 14 sends a state switching abnormal alarm signal.
Fig. 3 is a schematic circuit diagram of a dc charging system according to an embodiment of the present invention. As shown in fig. 3, the dc charging system includes at least one charging monitoring device 31 and at least one high-frequency type charging device 32. Wherein each of the charge monitoring devices 31 is connected to one of the high-frequency type charging devices 32; each high-frequency type charging device 32 is connected to an ac power supply; each high-frequency type charging device 32 is connected to an output-side dc bus.
In this embodiment, Tn is each charging module, and Sn and J are incoming line breakers.
Fig. 4 is a schematic structural diagram of a dc charging system according to an embodiment of the present invention. As shown in fig. 4, in some embodiments, the dc charging system further includes a monitoring terminal 33. The charge monitoring device 31 further includes a communication unit. The monitoring terminal 33 is connected with the communication unit; the communication unit is connected with the processing unit.
In this embodiment, the monitoring terminal 33 may include, but is not limited to, a desktop computer, a notebook computer, a tablet computer, and the like. The communication unit may be a 485 communication device, an ethernet communication device, etc., and is not limited herein.
Fig. 5 is a schematic circuit diagram of two high-frequency charging devices in a dc charging system according to an embodiment of the present invention. As shown in fig. 5, in some embodiments, the dc charging system may include more than two parallel high frequency type charging devices.
The charging monitoring device 31 is configured to transmit the operation data, the fault data, and the alarm signal of the corresponding high-frequency charging device 32 to the monitoring terminal 33.
The monitoring terminal 33 is configured to perform at least one of the following implementations:
in a possible implementation manner, the monitoring terminal 33 calculates the current sharing unbalance of each high-frequency charging device 32 in the enabled state in each preset voltage limiting period; if the high-frequency charging device 32 with the current-sharing unbalance degree exceeding the preset unbalance degree range exists, sending an unbalance alarm signal, adjusting all the high-frequency charging devices 32 in the hot standby state to the starting state, entering the next voltage-limiting period, and adjusting the state of the high-frequency charging device 32 with the highest current-sharing unbalance degree to be in the hot standby state or the quitting state in the next voltage-limiting period;
in a possible implementation, the monitoring terminal 33 is used when the control unit in the high-frequency charging device 32 needs to perform the step of adjusting the charging module in the hot standby state to the enabled state, and there is no charging module in the hot standby state in the high-frequency charging device 32; if there is a charging module in the hot standby state in the other high-frequency charging devices 32, the charging monitoring device 31 corresponding to the high-frequency charging device 32 in the hot standby state is controlled to adjust one or more charging modules in the hot standby state in the high-frequency charging devices 32 in the hot standby state to the enabled state.
In one possible implementation, the monitoring terminal 33 monitors each ac power supply during each preset voltage limiting period; if the alternating current power supply loses power, sending a power loss alarm, and adjusting the state of the high-frequency charging device 32 corresponding to the alternating current power supply to be in a quitting state; adjusting all the high-frequency charging devices 32 in the hot standby state except the high-frequency charging device 32 to the starting state, and entering the next voltage limiting period;
in one possible implementation, the monitoring terminal 33 sends a power state switching alarm signal if the state of the ac power supply cannot be switched.
In a possible implementation manner, the monitoring terminal 33 adjusts the state of each corresponding high-frequency charging device 32 or a part of the charging modules in each high-frequency charging device 32 to an exiting state according to a preset round-trip strategy in each preset round-trip period; after the round of retreating period is finished, the charging module in the retreating state in the round of retreating period is adjusted to be in the starting state, and the next round of retreating period is entered.
In this embodiment, the preset rotation-back period may be 7 days or one month, which is not limited herein. The preset round trip strategy may be that the number of charging modules per round trip is less than or equal to 1/4 of the total number of charging modules in the high frequency type charging device 32.
In this embodiment, the high-frequency charging devices 32 are adjusted according to the current sharing unbalance of each high-frequency charging device 32 in the enabled state, so that the output current of the single high-frequency charging device 32 can be effectively prevented from being too high or too low, the power supply stability is improved, and the device life is prolonged. By calling the charging devices of other high-frequency charging devices 32 when a certain high-frequency charging device 32 has no idle charging module, flexible power supply can be realized, and the service life is prolonged. Through monitoring alternating current power supply and the circuit breaker that corresponds, can effectively improve power supply stability. By the periodic round of retreating in the absence of a failure, the charging modules in the respective high-frequency type charging devices 32 can be alternately corrected, and the life of the respective high-frequency type charging devices 32 can be improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A charging monitoring device is characterized in that the charging monitoring device is used for being connected with a high-frequency type charging device, the high-frequency type charging device comprises a plurality of charging modules, and the charging modules are connected between an alternating current power supply and an output end direct current bus in parallel; the charge monitoring device includes: the device comprises a collecting unit, a processing unit and a control unit;
the acquisition unit is used for acquiring the output current of each charging module in a starting state and sending the output current to the processing unit;
the processing unit is used for calculating the average current load ratio of the high-frequency type charging device; when the average current load ratio is lower than a first preset threshold value, sending a first control instruction to the control unit;
the control unit is configured to adjust one or more charging modules in an enabled state to a hot standby state according to the first control instruction, so that the average current-to-load ratio of the adjusted high-frequency charging device is within a preset interval, where a lower limit value of the preset interval is greater than or equal to a first preset threshold value.
2. The charging monitoring device according to claim 1, wherein the collecting unit is connected to each charging module of the high-frequency charging device and the processing unit; the control unit is respectively connected with each charging module of the high-frequency charging device and the processing unit;
the average current load ratio is the ratio of the sum of the output currents of each charging module in the activated state to the sum of the rated currents.
3. The charge monitoring device according to claim 1, wherein the processing unit is configured to send the first control instruction to the control unit in each voltage limiting period when the average current-to-load ratio is lower than a first preset threshold;
the processing unit is further configured to: and after each voltage limiting period is finished, controlling the control unit to adjust all the charging modules in the hot standby state to the starting state, and entering the next voltage limiting period.
4. The charging monitoring device according to claim 1, wherein the collecting unit is further configured to collect temperature values of the charging modules in the enabled states and send the temperature values to the processing unit;
the processing unit is further used for calculating the current load ratio of each charging module in the starting state; wherein the current load ratio is the ratio of the output current to the rated current;
determining a first priority of the charging module in the starting state according to the temperature value, wherein the higher the temperature value is, the higher the first priority is; if the charging modules with the same first priority exist, determining a second priority of the charging modules with the same first priority according to the current load ratio, wherein the larger the current load ratio is, the higher the second priority is;
the processing unit is specifically configured to select one or more charging modules in an enabled state as charging modules to be adjusted in sequence according to the first priority and the second priority of each charging module, and control the control unit to adjust the charging modules to be adjusted to a hot standby state, so that the average current-to-load ratio of the adjusted high-frequency charging device is within a preset interval.
5. The charge monitoring device of claim 4, wherein the processing unit is further configured to determine a first serial number of the charging module in the enabled state according to the magnitude of the temperature value; determining a second serial number of the charging module in the starting state according to the current load ratio;
the processing unit is specifically configured to select one or more charging modules in an enabled state as charging modules to be adjusted in sequence according to the weighted sum of the first sequence number and the second sequence number from small to large, and control the control unit to adjust the charging modules to be adjusted to a hot standby state, so that the average current load ratio of the adjusted high-frequency charging device is within a preset interval.
6. The charge monitoring device according to any one of claims 1 to 5, further comprising an alarm unit; the alarm unit is connected with the processing unit;
the acquisition unit is also used for acquiring the output current of the alternating current power supply and the output current of the output end direct current bus;
the processing unit is further configured to perform at least one of: in each preset voltage limiting period, when a preset condition is met, judging that the charging module in the starting state is abnormal, controlling the alarm unit to send an abnormal alarm signal, controlling the control unit to adjust the abnormal charging module to the quitting state, adjusting all the charging modules in the hot standby state except the abnormal charging module to the starting state, and entering the next voltage limiting period; the preset conditions comprise that the output current of the alternating current power supply and the output current of the output end direct current bus are both normal values, the output current of the charging module in the starting state is zero, and the output voltage of the charging module cannot be adjusted;
in each preset voltage limiting period, calculating the current sharing unbalance degree of each charging module in the starting state; if the charging module with the current-sharing unbalance degree exceeding a preset unbalance degree range exists, the alarm unit is controlled to send an unbalance alarm signal, the control unit is controlled to adjust all the charging modules in the hot standby state to the starting state, the next voltage limiting period is entered, and the control unit is controlled to adjust the state of the charging module with the highest current-sharing unbalance degree to the hot standby state or the quitting state in the next voltage limiting period;
in each preset voltage limiting period, if the temperature value of the charging module in the starting state is greater than a second preset threshold value, the alarm unit is controlled to send an overheating alarm signal, the control unit is controlled to adjust all the charging modules in the hot standby state to the starting state, the next voltage limiting period is entered, and the control unit is controlled to adjust the state of the charging module with the highest temperature value to the hot standby state or the quitting state in the next voltage limiting period.
7. The charge monitoring device according to claim 6, wherein the device further comprises a status monitoring unit and/or a storage unit; the state monitoring unit is connected with the processing unit; the storage unit is connected with the processing unit;
the state monitoring unit is used for monitoring the running state of each charging module and sending the running state to the processing unit;
the processing unit is also used for controlling the alarm unit to send out a state switching abnormal alarm signal if the running state of the charging module cannot be switched;
and the storage unit is used for storing the operation data and the fault data of each charging module, which are sent by the processing unit.
8. A dc charging system comprising at least one charging monitoring device according to any one of claims 1 to 7 and at least one high-frequency type charging device; wherein each charging monitoring device is connected with one high-frequency type charging device; each high-frequency charging device is respectively connected with an alternating current power supply; each high-frequency charging device is connected with an output end direct current bus.
9. The dc charging system of claim 8, wherein the system further comprises a monitor terminal; the charging monitoring device further comprises a communication unit; the monitoring terminal is connected with the communication unit; the communication unit is connected with the processing unit.
10. The direct-current charging system according to claim 9, wherein the charging monitoring device is configured to send operation data, fault data, and an alarm signal of the corresponding high-frequency charging device to the monitoring terminal;
the monitoring terminal is used for executing at least one of the following: in each preset voltage limiting period, calculating the current sharing unbalance degree of each high-frequency charging device in the starting state; if the high-frequency charging device with the current-sharing unbalance degree exceeding the preset unbalance degree range exists, sending an unbalance alarm signal, adjusting all the high-frequency charging devices in the hot standby state to the starting state, entering the next voltage-limiting period, and adjusting the state of the high-frequency charging device with the highest current-sharing unbalance degree to be in the hot standby state or exiting state in the next voltage-limiting period;
when the control unit in the high-frequency type charging apparatus needs to perform the step of adjusting the charging module in the hot standby state to the enabled state, and there is no charging module in the hot standby state in the high-frequency charging apparatus; and if the charging modules in the hot standby state exist in other high-frequency charging devices, controlling the charging monitoring device corresponding to the high-frequency charging device in the hot standby state, and adjusting one or more charging modules in the hot standby state in the high-frequency charging devices in the hot standby state to be in the starting state.
Monitoring each alternating current power supply in each preset voltage limiting period; if the alternating current power supply loses power, sending a power loss alarm, and adjusting the state of the high-frequency charging device corresponding to the alternating current power supply to be in an exit state; adjusting all the high-frequency charging devices in the hot standby state except the high-frequency charging device to the starting state, and entering the next voltage limiting period;
and if the state of the alternating current power supply cannot be switched, sending a power supply state switching alarm signal.
In each preset round retreating period, adjusting the state of each corresponding high-frequency type charging device or part of charging modules in each high-frequency type charging device to a retreating state according to a preset round retreating strategy; after the round of retreating period is finished, the charging module in the retreating state in the round of retreating period is adjusted to be in the starting state, and the next round of retreating period is entered.
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