CN113872264B - 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
CN113872264B
CN113872264B CN202110961574.5A CN202110961574A CN113872264B CN 113872264 B CN113872264 B CN 113872264B CN 202110961574 A CN202110961574 A CN 202110961574A CN 113872264 B CN113872264 B CN 113872264B
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China
Prior art keywords
charging
state
frequency
current
charging module
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CN202110961574.5A
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CN113872264A (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 application 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 charging device, and the high-frequency 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 an acquisition unit, a processing unit and a control unit; the acquisition unit is used for acquiring the output current of each charging module in an enabling 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 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 an enabling state to a hot standby state according to the first control instruction so that the average current-load ratio of the adjusted high-frequency charging device is located in a preset interval. By correspondingly adjusting each charging module when the average current-load ratio is too small, faults caused by low-load operation of each charging module can be avoided.

Description

Charging monitoring device and direct-current charging system
Technical Field
The application belongs to the technical field of 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 power plant and transformer substation power supply system, and has important influence on safe operation of a power grid and stable national development. The power supply of the direct current power supply system mainly comprises a rectifying and charging device and a storage battery pack. Under normal conditions, the direct-current power supply system supplies power to the direct-current load through the rectification charging device by the alternating-current power supply for the station, and simultaneously charges the storage battery.
The high-frequency charging device is a rectifying charging device which adopts a power semiconductor device as a high-frequency conversion switch and converts alternating current into direct current through the isolation of a high-frequency transformer. High-frequency charging devices are used in power dc power systems to charge batteries and provide dc power. In order to ensure the stable operation of the power direct-current power supply system, the high-frequency charging device needs to be overhauled.
At present, a manual regular inspection and maintenance mode is generally adopted to carry out maintenance on the high-frequency charging device. However, the monitoring force of the maintenance mode on the high-frequency type charging device is weak, and the failure rate of the high-frequency type charging device is high.
Disclosure of Invention
In view of the above, the present application provides a charging monitoring device and a dc charging system, which aim to solve the problem of high failure rate of a high-frequency charging device.
A first aspect of an embodiment of the present application provides a charging monitoring device, where the charging monitoring device is configured to be connected to a high-frequency charging device, where the high-frequency charging device includes a plurality of charging modules, where the plurality of charging modules are connected in parallel between an ac power supply and an output dc bus; the charging monitoring device includes: the device comprises an acquisition unit, a processing unit and a control unit;
the acquisition unit is used for acquiring the output current of each charging module in an enabled 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, a first control instruction is sent 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 an average current-load ratio of the adjusted high-frequency charging device is located in 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 application provides a dc charging system, including: at least one charge monitoring device as described in the first aspect above 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 connected with an alternating current power supply respectively; each high-frequency charging device is connected with the output end direct current bus.
The charging monitoring device and the direct current charging system provided by the embodiment of the application are used for being connected with a high-frequency charging device, wherein the high-frequency 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 an acquisition unit, a processing unit and a control unit; the acquisition unit is used for acquiring the output current of each charging module in an enabled state and sending the output current to the processing unit; a processing unit for calculating an average current-to-load ratio of the high-frequency 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 an enabling state to a hot standby state according to the first control instruction so that the average current load ratio of the adjusted high-frequency charging device is positioned in a preset interval, wherein the lower limit value of the preset interval is larger than or equal to a first preset threshold value. By correspondingly adjusting each charging module in the high-frequency charging device when the average current load ratio is too small, faults 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 of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a charging monitoring device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a charging monitoring device according to another embodiment of the present application;
fig. 3 is a schematic circuit diagram of a dc charging system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a dc charging system according to an embodiment of the present application;
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 application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application 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 application with unnecessary detail.
The direct current power supply system is an important component of power plant and transformer substation power supply system, and provides reliable power supply for secondary systems and equipment of plant stations such as relay control protection devices, automatic control devices, breaker opening and closing mechanisms, metering, communication, accident lighting and the like. Along with the continuous construction and development of modern large-scale power projects such as large-scale unit power plants, ultra-high voltage substations and the like, the system is taken as a direct current power supply system of a large-scale station power supply pulse, and has important influence on the safe operation of a power grid and the stable development of the country. The power supply of the direct current power supply system mainly comprises a rectifying and charging device and a storage battery pack, and under normal conditions, the direct current power supply system supplies power to a direct current load through the rectifying and charging device by an alternating current power supply for a station and simultaneously charges the storage battery pack in a floating way. The charging device is used as one of the most core components in the 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 and converts alternating current into direct current through isolation of a high-frequency transformer. In an electric dc power system for charging a battery and providing dc power. In recent years, high-frequency charging devices have been phased out of phase-control charging devices, which have become the first choice for power dc power systems, due to their relatively advanced technology, good performance, and redundant configuration of charging modules.
According to the scale and voltage level of the plant, 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 triple-charging. The single-storage single-charging power supply mode is that the direct current power supply system adopts a single bus for power supply, a set of high-frequency charging device and a set of storage battery are configured, and 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 is used for supplying power to the direct current bus. A 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 incoming line to switch between the main power supply and the standby power supply. The double-storage double-charging power supply mode, namely the direct current power supply system adopts a two-section single-bus power supply mode, each section bus is provided with a set of high-frequency charging device and a set of storage batteries, and the configuration condition of the charging device of each section bus is the same as that of the single-storage single-charging power supply mode. The double-storage and three-charging power supply mode is that a set of standby high-frequency charging device is additionally arranged on the basis of the double-storage and double-charging power supply mode and is used for maintenance and fault standby.
Although the high-frequency type charging device improves the power supply reliability of the power direct-current power supply system, the current power supply mode still has the following problems from the practical operation experience, 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 is out of power, the standby alternating current power supply cannot be timely and correctly put into power because the alternating current switching device fails or is not switched in place, so that the whole set of high-frequency charging device is out of power. And each charging device is formed by connecting a plurality of high-frequency charging modules of the same type in parallel in a redundant configuration, but at present, most of power engineering do not have a separate incoming line breaker for each high-frequency charging module, so that when a single module fails or is put into and out of service, the whole set of high-frequency charging device is required to be powered off. At present, each high-frequency charging module is additionally provided with an incoming line breaker. However, when the module fails or is in switching, manual operation is still needed, and an automatic switching function is lacking. Thirdly, the charging module of the main charging device runs for a long time due to the lack of an active rotation switching operation and maintenance strategy of the charging module, and the charging module of the standby charging device is placed for a long time, so that the standby charging device can only be manually put into the charging device, and the whole healthy running of the charging device is not facilitated. And fourthly, the input and output of the charging module cannot be effectively monitored and the fault is alarmed.
Aiming at the problems, the application provides a charging monitoring device and a direct current charging system, which realize intelligent switching of single or multiple charging modules, on-line monitoring and fault alarming 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 charging monitoring device according to an embodiment of the present application. As shown in fig. 1, the charging monitoring device 1 is used for being connected with a high-frequency charging device, and the high-frequency charging device comprises a plurality of charging modules which are connected in parallel between an ac power supply and an output end dc bus. The charging monitoring device 1 includes: the device comprises an acquisition 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 charging device; and sends a first control instruction to the control unit 13 when the average current load ratio is below 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 an average current-to-load ratio of the adjusted high-frequency charging device is located in 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 acquisition unit 11 may acquire 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 a high-frequency dc charger, and is not limited herein. The output voltage of each charging module can be adjusted. Alternatively, the first preset threshold may be 0.2. Adjusting the charging module in the enabled state to a hot standby state is: and regulating down the output voltage of the charging module to make the output voltage smaller than the voltage of the direct current bus at the output end, and stopping the output state of the output module at the moment. When the charging module is adjusted to the hot standby state, the original running 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 quickly started at any time. Alternatively, the preset interval may be [0.3,0.6]. When the charging module operates in a preset interval, a more stable working state and a longer service life are provided.
In this embodiment, the charging monitoring device 1 is used for being connected with a high-frequency charging device, and 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 charging monitoring device 1 includes: the device comprises an acquisition unit 11, a processing unit 12 and a control unit 13; the acquisition unit 11 is used for acquiring the output current of each charging module in an enabled state and sending the output current to the processing unit 12; a processing unit 12 for calculating an average current-load ratio of the high-frequency charging device; and when the average current load ratio is lower than a first preset threshold value, 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 an average current-to-load ratio of the adjusted high-frequency charging device is located in a preset interval, where a lower limit value of the preset interval is greater than or equal to a first preset threshold value. By correspondingly adjusting each charging module in the high-frequency charging device when the average current load ratio is too small, faults 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 with each charging module and the processing unit 12 of the high-frequency type charging device; the control unit 13 is connected to each of the charging modules and the processing unit 12 of the high-frequency charging device.
The average current-to-load ratio is the ratio of the sum of the output currents of each of the charging modules in the enabled state to the sum of the rated currents.
In this embodiment, the expression of the average current-load ratio is as follows:
wherein F is Average of For average current-to-load ratio, itotal is the sum of the output currents of each charging module in the active state, n is the total number of charging modules in the high-frequency charging device, x is the number of charging modules in the hot standby state, I N Is 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 when the average current-to-load ratio is lower than a first preset threshold value during each voltage limiting period.
The processing unit 12 is 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 enabled 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 this embodiment, by adopting the voltage limiting period, each charging module can be subjected to alternate standby rest in each voltage limiting period, so that the service life of the charging module can be effectively prolonged.
In some embodiments, the collecting unit 11 is further configured to collect temperature values of each charging module in the enabled state and send the temperature values to the processing unit 12.
The processing unit 12 is further configured to calculate, for each charging module in an enabled state, a current-to-load ratio of the charging module; the current load ratio is the ratio of the output current to the rated current.
The first priority of the charging module in the starting state is determined according to the magnitude of 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 are present, determining a second priority of the charging modules with the same first priority according to the magnitude of 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 a charging module to be adjusted according to the first priority and the second priority of each charging module, and control the control unit 13 to adjust the charging module to be adjusted to a hot standby state, so that the average current-load ratio of the adjusted high-frequency charging device is located in a preset interval.
In this embodiment, the second priority may be a sub-level of the first priority. For example, let the numbers of the first priorities be 1, 2, 3, …, n, the smaller the number indicates the higher the priority, the number of a certain group of second priorities may be 2.1, 2.2, 2.3, and the adjustment sequence 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 a first serial number of the charging module in the enabled state according to the magnitude of the temperature value; and 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 sequentially select one or more charging modules in an enabled state as a charging module to be adjusted according to a weighted sum of the first serial number and the second serial number from small to large, and control the control unit to adjust the charging module to be adjusted to a hot standby state, so that an average current load ratio of the adjusted high-frequency charging device is located in a preset interval.
In this embodiment, the smaller the temperature, the smaller the first serial number. The smaller the current-load ratio, the smaller the second sequence number. The expression of the weighted sum is as follows:
W＝n 1 ·α+n 2 ·β (2)
wherein W is a weighted sum, n 1 For the first sequence number, n 2 And alpha is the weight of the first sequence number, and beta is the weight of the second sequence number.
In this embodiment, through the charging module that the priority adjustment temperature is high, the current load ratio is little, can prevent effectively that the charging module from overheated and the high-load operation, can effectively reduce the fault rate of charging module, improve the life of charging module, improve the power supply stability of charging module.
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-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 the second control instruction, so that an average current-load ratio of the adjusted high-frequency charging device is located in a preset interval, where an upper limit value of the preset interval is less than or equal to a third preset threshold value.
In this embodiment, by adjusting the charging device when the average current-load ratio is too high, unstable power supply and faults caused by continuous high-load operation of the charging module can be effectively prevented, and the service life and power supply stability of the charging module are effectively improved.
In some embodiments, the processing unit 12 is further specifically configured to obtain an executed duration of each charging module in the enabled state, and determine the second priority according to the executed duration;
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 adjusted average current-load ratio of the high-frequency charging device is located in the preset interval.
In this embodiment, by determining the adjustment sequence of the charging modules according to the running duration, it is possible to avoid that the current output by a charging module and other modules is unbalanced and the power supply stability is affected due to the fact that the service time of a certain charging module is too long relative to other charging modules.
Fig. 2 is a schematic structural diagram of a charging monitoring device according to another embodiment of the present application. As shown in fig. 2, in some embodiments, the charging monitoring device 1 further comprises an alarm unit 14. The alarm unit 14 is connected to the processing unit 12.
The acquisition unit 11 is also used for acquiring the output current of the alternating current power supply and the output current of the direct current bus at the output end.
The processing unit 12 is further configured to perform at least one of the following implementations:
in one possible implementation manner, the processing unit 12 determines that the charging module in the activated state is abnormal when the preset condition is met in each preset voltage limiting period, and controls the alarm unit 14 to send out an abnormal alarm signal, and controls the control unit 13 to adjust the abnormal charging modules to the exit state, and adjust all the charging modules in the hot standby state except the abnormal charging modules to the activated state, so as to enter the next voltage limiting period; the preset conditions include that the output current of the alternating current power supply and the output current of the direct current bus at the output end are normal values, the output current of the charging module in an enabling state is zero, and the output voltage of the charging module cannot be adjusted.
In one possible implementation, the processing unit 12 calculates, in each preset voltage limiting period, a current sharing imbalance of each charging module in an enabled state; if the current-sharing unbalance exceeds the charging module in the preset unbalance interval, 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, enters the next voltage limiting period, and the control unit 13 adjusts the state of the charging module with the highest current-sharing unbalance to the hot standby state or the exiting state in the next voltage limiting period.
In one 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 out 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 the 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 exit state in the next voltage limiting period.
In this embodiment, the adjustment of the charging module to the exit state may be to disconnect the incoming line breaker of the charging module. After the charging module exits, an maintainer can conveniently check the charging module. The expression of the current sharing unbalance degree of the charging module in the starting state is as follows:
wherein the ECU i Equalizing the unbalance degree for each charging module in the starting state, I i For the output current of each charging module in the enabled state, I Average of The average value of the output current of each charging module in the enabled state is used.
Alternatively, the preset imbalance interval may be [ -5%,5% ]. Alternatively, the second preset threshold may be 60 degrees celsius.
In this embodiment, by performing corresponding control on an abnormal charging module (for example, a 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 that flow equalizes that monitors each charging module, can prevent effectively that single charging module from transshipping and damaging, improve charging module's life, can also prevent that the power quality of output DC bus that each charging module output current difference caused from becoming low. Through the temperature of each module that charges of monitoring, can effectively prevent the overheat damage of the module that charges, improve life.
In some embodiments, the charging monitoring device further comprises a status monitoring unit 15 and/or a storage unit 16. The state monitoring unit 15 is connected to the processing unit 12. The memory unit 16 is connected to the processing unit 12.
The state monitoring unit 15 is configured to monitor an operation state of each charging module and send the operation state to the processing unit 12.
The processing unit 12 is further configured to control the alarm unit 14 to send out a state switching abnormality alarm signal if there is no switching of the operation state of the charging module.
And the storage unit is used for storing the operation data and 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 circuit breaker corresponding to each charging module, and if the incoming line circuit breaker fails, the control alarm unit 14 sends out a state switching abnormality alarm signal.
Fig. 3 is a schematic circuit diagram of a dc charging system according to an embodiment of the present application. As shown in fig. 3, the dc charging system includes at least one charging monitor 31 and at least one high-frequency type charging device 32. Wherein each charging monitor device 31 is connected to one high-frequency type charging device 32; each high-frequency charging device 32 is connected to an ac power source; each high-frequency charging device 32 is connected to an output 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 application. As shown in fig. 4, in some embodiments, the dc charging system further includes a monitoring terminal 33. The charging 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 monitor terminal 33 may include, but is not limited to, a desktop computer, a notebook computer, a tablet computer, etc., which is not limited herein. The communication unit may be a 485 communication device, an ethernet communication device, or the like, which 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 application. As shown in fig. 5, in some embodiments, the dc charging system may include more than two parallel high frequency charging devices.
The charging monitoring device 31 is configured to send operation data, fault data, and alarm signals 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 one possible implementation, 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 type charging device 32 with the current sharing unbalance degree exceeding the preset unbalance degree interval exists, an unbalance alarm signal is sent, all the high-frequency type charging devices 32 in the hot standby state are adjusted to be in an enabling state, a next voltage limiting period is entered, and the state of the high-frequency type charging device 32 with the highest current sharing unbalance degree is adjusted to be in the hot standby state or to be out of the state in the next voltage limiting period;
in one possible implementation, the control unit of the monitoring terminal 33 in the high-frequency type charging device 32 needs to perform the step of adjusting the charging module in the hot standby state to the enabled state, and when the charging module in the hot standby state does not exist in the high-frequency type charging device 32; if there is a charging module in the hot standby state in the other high-frequency charging devices 32, the charging monitor 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 device 32 in the hot standby state to the activated state.
In one possible implementation, the monitoring terminal 33 monitors the respective ac power supply for each preset voltage limiting period; if the alternating current power supply is in a power failure state, a power failure alarm is sent out, and the state of the high-frequency charging device 32 corresponding to the alternating current power supply is adjusted to an exit state; adjusting all the high-frequency charging devices 32 in the hot standby state except the high-frequency charging device 32 to an enabled 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 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 charging modules in each high-frequency charging device 32 to an exit state according to a preset round-trip strategy in each preset round-trip period; and after the wheel-back period is finished, the charging module in the exit state in the wheel-back period is adjusted to be in a starting state, and the next wheel-back period is entered.
In this embodiment, the preset cycle 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 of a single round trip is less than or equal to 1/4 of the total number of charging modules in the high frequency charging device 32.
In this embodiment, by adjusting each high-frequency charging device 32 according to the current sharing imbalance of each high-frequency charging device 32 in the activated state, the output current of a single high-frequency charging device 32 can be effectively prevented from being too high or too low, and the power supply stability and the device lifetime can be improved. By calling the charging device of the other high-frequency type charging device 32 when a certain high-frequency type charging device 32 has no idle charging module, flexible power supply can be realized, and the service life can be prolonged. By monitoring the alternating current power supply and the corresponding circuit breaker, the power supply stability can be effectively improved. By periodically reversing the charging modules in each of the high-frequency type charging devices 32 when there is no failure, the charging modules can be alternately corrected, and the life of each of the high-frequency type charging devices 32 can be increased.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
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 solution. 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 application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (8)

1. The charging monitoring device is characterized by being connected with a high-frequency charging device, wherein the high-frequency 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 charging monitoring device includes: the device comprises an acquisition unit, a processing unit and a control unit;
the acquisition unit is used for acquiring the output current of each charging module in an enabled 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, a first control instruction is sent 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 an average current-load ratio of the adjusted high-frequency charging device is located in a preset interval, where a lower limit value of the preset interval is greater than or equal to a first preset threshold value;
the acquisition unit is respectively connected with each charging module and the processing unit of the high-frequency charging device; the control unit is respectively connected with each charging module and the processing unit of the high-frequency charging device;
the average current load ratio is the ratio of the sum of the output currents of each charging module in an enabled state to the sum of rated currents;
the average current-to-load ratio is expressed as follows:
wherein F is Average of For average current-to-load ratio, itotal is the sum of the output currents of each charging module in the active state, n is the total number of charging modules in the high-frequency charging device, x is the number of charging modules in the hot standby state, I N Rated current for the charging module;
the acquisition unit is also used for acquiring the temperature value of each charging module in an enabled state and sending the temperature value 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 an enabled state according to the magnitude of 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 sequentially select one or more charging modules in an enabled state as a charging module to be adjusted according to the first priority and the second priority of each charging module, and control the control unit to adjust the charging module to be adjusted to a hot standby state, so that an average current-load ratio of the adjusted high-frequency charging device is located in a preset interval.
2. The charge monitoring device according to claim 1, wherein the processing unit is specifically configured to send the first control instruction to the control unit when the average current-to-load ratio is lower than a first preset threshold value in each voltage limiting period;
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.
3. The charge monitoring device of claim 1, wherein the processing unit is further configured to determine a first serial number of the charge module in the enabled state according to the magnitude of the temperature value; determining a second serial number of the charging module in an enabled state according to the current load ratio;
the processing unit is specifically configured to sequentially select one or more charging modules in an enabled state as a charging module to be adjusted according to a 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 module to be adjusted to a hot standby state, so that an average current load ratio of the adjusted high-frequency charging device is located in a preset interval.
4. A charging monitoring device according to any one of claims 1-3, characterized in that the charging monitoring device further comprises 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 preset conditions are 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 modules to an exiting state, adjusting all the charging modules in a hot standby state except the abnormal charging modules 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 direct current bus at the output end are normal values, the output current of a charging module in an enabling 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 an enabled state; if the current-sharing unbalance degree exceeds the charging module in the preset unbalance degree interval, the alarm unit is controlled to send out 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 exiting state in the next voltage limiting period;
and in each preset voltage limiting period, if the temperature value of the charging module in the starting state is larger than a second preset threshold value, controlling the alarm unit to send out an overheat alarm signal, controlling the control unit to adjust all the charging modules in the hot standby state to the starting state, entering the next voltage limiting period, and controlling the control unit to adjust the state of the charging module with the highest temperature value to the hot standby state or the exiting state in the next voltage limiting period.
5. The charging monitoring device according to claim 4, further comprising 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 further 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;
the storage unit is used for storing the operation data and the fault data of each charging module sent by the processing unit.
6. A direct current charging system comprising at least one charging monitoring device according to any one of claims 1-5 and at least one high frequency charging device; wherein each charging monitoring device is connected with one high-frequency type charging device; each high-frequency charging device is connected with an alternating current power supply respectively; each high-frequency charging device is connected with the output end direct current bus.
7. The direct current charging system of claim 6, wherein the system further comprises a monitoring 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.
8. The direct current charging system according to claim 7, wherein the charging monitoring device is configured to send operation data, fault data, and alarm signals 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 an enabled state; if the high-frequency type charging devices with the current sharing unbalance degree exceeding the preset unbalance degree interval exist, an unbalance alarm signal is sent out, all the high-frequency type charging devices in the hot standby state are adjusted to be in an enabling state, a next voltage limiting period is entered, and the state of the high-frequency type charging device with the highest current sharing unbalance degree is adjusted to be in the hot standby state or an exiting state in the next voltage limiting period;
when the control unit in the high-frequency type charging device needs to perform the step of adjusting the charging module in the hot standby state to the enabled state, and the charging module in the hot standby state is not present in the high-frequency type charging device; if the charging module in the hot standby state exists in the other high-frequency charging devices, controlling a 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 device in the hot standby state to an enabling state;
monitoring each alternating current power supply in each preset voltage limiting period; if the alternating current power supply is in power failure, a power failure alarm is sent out, and the state of the high-frequency charging device corresponding to the alternating current power supply is adjusted to be in an exit state; adjusting all the high-frequency charging devices except the high-frequency charging device in a hot standby state to an enabling state, and entering a next voltage limiting period;
if the state of the alternating current power supply cannot be switched, a power supply state switching alarm signal is sent;
in each preset wheel-backing period, the state of each corresponding high-frequency type charging device or part of charging modules in each high-frequency type charging device is adjusted to an exit state according to a preset wheel-backing strategy; and after the wheel-back period is finished, the charging module in the exit state in the wheel-back period is adjusted to be in a starting state, and the next wheel-back period is entered.
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