CN115498753A - Independent control method of direct current power supply and related device - Google Patents

Independent control method of direct current power supply and related device Download PDF

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Publication number
CN115498753A
CN115498753A CN202211216370.XA CN202211216370A CN115498753A CN 115498753 A CN115498753 A CN 115498753A CN 202211216370 A CN202211216370 A CN 202211216370A CN 115498753 A CN115498753 A CN 115498753A
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China
Prior art keywords
current
bus
value
power supply
tie
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CN202211216370.XA
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Chinese (zh)
Inventor
刘雄航
苏晓琳
上官志渊
林凯
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Xiamen Huaruisheng Intelligent Technology Co ltd
Kehua Data Co Ltd
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Xiamen Huaruisheng Intelligent Technology Co ltd
Kehua Data Co Ltd
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Priority to CN202211216370.XA priority Critical patent/CN115498753A/en
Publication of CN115498753A publication Critical patent/CN115498753A/en
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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
    • 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
    • H02J9/061—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 for DC powered loads
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection

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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)

Abstract

The invention provides an independent control method of a direct current power supply and a related device, wherein the method comprises the following steps: acquiring the actual battery current of a battery module corresponding to the current power supply device in the current period; calculating the difference between the actual battery current and the set value of the average charging current to obtain the battery current difference; acquiring a bus-tie current actual value of a bus-tie section between at least two rectifier cabinets in the current period, and judging whether the bus-tie current actual value meets a preset condition or not; if the actual value of the bus tie current meets the preset condition, calculating a bus tie reference value of the current period based on the actual value of the bus tie current; and calculating a preset voltage value of the current period based on the battery current difference value and the bus-tie reference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period. According to the method and the device, when the current of the bus connection section does not meet the preset condition, the bus current is controlled on the basis of the uniform charging logic, so that the overcurrent problem of the battery current is avoided.

Description

Independent control method of direct current power supply and related device
Technical Field
The present invention relates to the field of power supply technologies, and in particular, to an independent control method for a dc power supply and a related apparatus.
Background
The core of the data center Power supply System architecture is an Uninterruptible Power System (Uninterruptible Power System), and main devices constituting the System are an alternating Current (ac) Power System (UPS) or a Direct Current (High Voltage Direct Current (HVDC)). In order to meet the power supply requirements of different reliability levels of a data center, different solutions of an uninterruptible power supply architecture are adopted in the industry at present.
In order to ensure the power supply reliability of a medium-voltage direct power supply, at present, a bus coupler device is generally considered to be added on the low-voltage sides of at least two rectifier cabinets, so that the reliability of equipment is improved. The bus coupler at the low-voltage side is divided into an alternating current bus coupler and a direct current bus coupler. Aiming at a direct current bus-bar connection structure, the current overcurrent problem of one group of battery modules is often caused by the existing control method when the battery capacities of two rectifier cabinets are inconsistent.
Disclosure of Invention
In view of this, the present invention provides an independent control method and a related device for a dc power supply, which can solve the problem of battery overcurrent caused by inconsistent battery capacities of two rectifier cabinets in a medium-voltage dc power supply with a bus coupler device at a low-voltage side.
In a first aspect, an embodiment of the present invention provides an independent control method for a dc power supply, where the dc power supply includes a dc bus coupler and at least two power supply devices, and each power supply device includes a rectifier cabinet, a battery module, and a monitoring unit;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus coupler is connected between the direct current output ends of at least two rectifier cabinets;
the method is applied to a monitoring unit corresponding to any power supply device, and comprises the following steps:
acquiring the actual battery current of a battery module corresponding to the current power supply device in the current period;
calculating the difference between the actual battery current and the set value of the average charging current to obtain the battery current difference;
acquiring a bus-coupled current actual value of a bus-coupled section between at least two rectifier cabinets in a current period, and judging whether the bus-coupled current actual value meets a preset condition or not;
if the actual value of the bus tie current meets the preset condition, calculating a bus tie reference value of the current period based on the actual value of the bus tie current;
and calculating a preset voltage value of the current period based on the battery current difference value and the bus coupler reference value of the current period, and controlling the output voltage of the rectifier cabinet corresponding to the current power supply device based on the preset voltage value of the current period.
In a second aspect, an embodiment of the present invention provides an independent control device for a dc power supply, where the dc power supply includes a dc bus coupler and at least two power supply devices, and the power supply devices include a rectifier cabinet, a battery module, and a monitoring unit;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus coupler is connected between the direct current output ends of at least two rectifier cabinets;
the independent control device of the direct current power supply is applied to a monitoring unit corresponding to any power supply device, and comprises:
the actual battery current acquisition module is used for acquiring the actual battery current of the battery module corresponding to the current power supply device in the current period;
the battery current difference value calculating module is used for calculating the difference value between the actual battery current and the set value of the average charging current to obtain a battery current difference value;
the bus current judgment module is used for acquiring the actual bus-tie current value of a bus-tie section between at least two rectifier cabinets in the current period and judging whether the actual bus-tie current value meets a preset condition or not;
the bus tie reference value calculating module is used for calculating a bus tie reference value of the current period based on the actual value of the bus tie current if the actual value of the bus tie current meets a preset condition;
and the voltage control module is used for calculating a preset voltage value of the current period based on the battery current difference value and the bus coupler reference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period.
In a third aspect, an embodiment of the present invention provides a monitoring unit, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to any one of the possible implementation manners of the first aspect when executing the computer program.
In a fourth aspect, the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of the method according to any one of the possible implementation manners of the first aspect.
In a fifth aspect, an embodiment of the present invention provides a dc power supply, including: the direct current bus coupler device comprises a direct current bus coupler device and at least two power supply devices, wherein each power supply device comprises a rectifier cabinet, a battery module and the monitoring unit of the third aspect;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus coupler is connected between the direct current output ends of at least two rectifier cabinets.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the embodiment of the invention obtains the actual battery current of the battery module corresponding to the current power supply device in the current period; calculating the difference between the actual battery current and the set value of the average charging current to obtain the battery current difference; acquiring a bus-tie current actual value of a bus-tie section between at least two rectifier cabinets in the current period, and judging whether the bus-tie current actual value meets a preset condition or not; if the actual value of the bus-tie current meets the preset condition, calculating a bus-tie reference value of the current period based on the actual value of the bus-tie current; and calculating a preset voltage value of the current period based on the battery current difference value and the bus-tie reference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period. According to the method and the device, when the current of the bus connection section does not meet the preset condition, the bus current is controlled on the basis of the uniform charging logic, so that the overcurrent problem of the battery current is avoided.
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 dc power supply according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dc power supply according to an embodiment of the present invention;
fig. 3 is a flowchart of an implementation of an independent control method for a dc power supply according to an embodiment of the present invention;
fig. 4 is a control block diagram of an independent control method of a dc power supply according to an embodiment of the present invention;
fig. 5 is a schematic diagram of simulation data provided by an embodiment of the present application, wherein fig. 5a shows a schematic diagram of a simulation curve of a sum of actual battery currents of two battery modules; FIG. 5b is a diagram illustrating a simulation curve of an actual value of the bus tie current; fig. 5c shows a diagram of the actual cell current for a cell module with a low cell capacity, and fig. 5d shows a diagram of the actual cell current for a cell module with a high cell capacity;
fig. 6 is a schematic structural diagram of an independent control device of a dc power supply according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a monitoring unit provided by an embodiment of the invention;
fig. 8 is a schematic structural diagram of a dc power supply including a plurality of monitoring devices according to an 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.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 and fig. 2 respectively show a schematic structural diagram of a dc power supply including two power supply devices provided in an embodiment of the present invention, and fig. 8 shows a schematic structural diagram of a dc power supply in which a plurality of power supply devices provided in an embodiment of the present invention are connected by a dc bus-bar device. Referring to fig. 1, 2 and 8, the dc power supply includes: the direct-current bus coupler comprises a direct-current bus coupler device and at least two power supply devices, wherein each power supply device comprises a rectifier cabinet, a battery module and a monitoring unit;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus coupler is connected between the direct current output ends of at least two rectifier cabinets.
As shown in fig. 1 or fig. 2, the power supply apparatus further includes a phase-shift transformer and a power distribution unit. Specifically, the mains supply is connected with the high-voltage side of the phase-shifting transformer, the low-voltage side of the phase-shifting transformer is connected with the alternating-current end of the rectifier cabinet, the direct-current output end of the rectifier cabinet is connected with the battery module and the power distribution unit respectively, and at least two rectifier cabinets are connected through the direct-current bus coupler.
The direct-current bus coupling device comprises an air-opening normally-closed direct-current bus coupling device and a fuse normally-closed direct-current bus coupling device. As shown in fig. 1, the direct current bus coupler device in an air-open normally-closed form includes an air-open switch K1, and the air-open switch is in a normally-closed state. As shown in fig. 2, the dc bus device in the form of a fuse normally closed is a fuse PUSE.
When the direct-current bus coupler device operates normally, at least two power supply devices output simultaneously, information exchange can be carried out when the at least two power supply devices operate, and when any one path of commercial power is abnormally powered off, the other path of commercial power can directly realize the power supply continuity of the load through the bus coupler section.
Specifically, the winding angles of the phase-shifting transformers of at least two power supply devices in the bus-coupled mode can be consistent, or can be in a form of 72 pulses formed by interleaving and connecting in parallel, and from the using angle, the output ripple wave of the 72 pulse form formed by interleaving and connecting in parallel is smaller than the connection mode of 36 pulses in the same angle. In order to ensure the consistency of the structural forms, at least two rectifier cabinets are provided with a fuse wire PUSE and a current Hall sensor HL at the bus connection section. The current Hall sensor is used for acquiring the actual bus-tie current value of the bus-tie section and sending the actual bus-tie current value to the monitoring unit in the cabinet.
Specifically, each rectifier cabinet comprises a plurality of rectifier modules, and the plurality of rectifier modules are connected in parallel for output.
In this embodiment, a dc bus-bar device with a large line resistance can be selected, and the larger the line resistance is, the smaller the current of the dc bus-bar section is, and the smaller the mutual influence between the cabinets is.
Referring to fig. 3, it shows a flowchart of an implementation of an independent control method for a dc power supply provided in an embodiment of the present invention, where the control method is applied to a monitoring unit in the dc power supply, and is detailed as follows:
s101: and acquiring the actual battery current of the battery module corresponding to the current power supply device in the current period.
In this embodiment, each monitoring unit is used to independently control its corresponding power supply device.
Firstly, for each monitoring unit, the monitoring unit collects the actual battery current in the power supply device through a Hall current sensor.
S102: and calculating the difference between the actual battery current and the set value of the average charging current to obtain the battery current difference.
In this embodiment, a set value of an equalizing charge current of the power supply apparatus is preset in each monitoring apparatus, and is used for controlling a battery module in the power supply apparatus by using an equalizing charge logic.
Specifically, as shown in fig. 4, fig. 4 shows an independent control block diagram of the dc power supply provided in this embodiment. The embodiment adopts a setting value I of the equalizing charge current bat_ret Subtracting the actual battery current I of the current cycle bat_fb And obtaining the battery current difference value of the current period.
S103: acquiring the actual value of the bus-tie current of the bus-tie section between at least two rectifier cabinets in the current period, and judging whether the actual value of the bus-tie current meets the preset condition.
In this embodiment, when each power device is independently controlled by the equalizing logic, if the battery capacities corresponding to each power device are consistent, even if the load amounts are inconsistent, the battery module can still correctly execute the equalizing logic, but when the battery capacities are inconsistent, the output of the rectifier cabinet with lower capacity is not performed due to the difference of 2% between the capacities, because the charging current is provided by the rectifier cabinet of another power device, and the charging current exceeds the equalizing current, so that when the power device is controlled according to the equalizing logic, the voltage is reduced, and finally, the voltage is reduced to the lowest point 220V of the set voltage.
In practical system operation, the battery capacities of the two power devices are necessarily different, so that it is not feasible to adopt logic for controlling the charging of the two power devices independently. The reason why the above control is not possible in the present embodiment is that each of the two power supply devices has only one setting value of the equalized charge current as a control target, which affects the control of the other power supply device. On this basis, because there is the direct current interaction of bus tie section between two cabinets, consequently this embodiment can increase the electric current of bus tie section to the control loop in, revise the loop, increase the control of bus tie electric current, guarantee that bus tie electric current does not overrun, and bus tie section voltage approaches to zero.
In one possible embodiment, as shown in fig. 4, the preset condition is the actual value I of the bus tie current bus_fb Is greater than a predetermined current value I bus_H 。
Specifically, if the actual value of the bus-tie current I bus_fb Is greater than a predetermined current value I bus_H To say thatThe bus-tie current is out of limit, so the bus-tie current control needs to be added into the equalizing charge control logic.
S104: and if the actual value of the bus-coupled current meets the preset condition, calculating a bus-coupled reference value of the current period based on the actual value of the bus-coupled current.
S105: and calculating a preset voltage value of the current period based on the battery current difference value and the bus coupler reference value of the current period, and controlling the output voltage of the rectifier cabinet corresponding to the current power supply device based on the preset voltage value of the current period.
In this embodiment, after the preset voltage value of the current period is obtained through calculation, the preset voltage value is sent to the rectifying module corresponding to the power supply device, so that the rectifying module controls the output voltage of the power supply device based on the preset voltage value.
According to the embodiment, when the current of the bus connection section does not meet the preset condition, the bus current can be controlled on the basis of the charging logic, so that the current of the bus connection section is zero, and the overcurrent problem of the battery current is avoided.
In one possible embodiment, as shown in fig. 4, the specific implementation flow of S104 includes:
setting the current of the bus-tie I bus_ret Subtracting the actual value I of the bus tie current bus_fb Obtaining a bus-coupled current difference value of the current period;
and inputting the bus tie current difference value into a first PI controller to obtain a bus tie reference value of the current period.
Specifically, in this step, because the current flow directions of the bus-tie segments are different under different conditions, in this embodiment, only the value of the set value of the bus-tie current may be prestored in the monitoring unit, when it is determined that the actual value of the bus-tie current meets the preset condition, the current sign of the actual value of the bus-tie current is obtained, and the current sign of the actual value of the bus-tie current is used as the sign of the set value of the bus-tie current, that is, the value of the set value of the bus-tie current is multiplied by the current sign of the actual value of the bus-tie current to obtain the set value of the bus-tie current, and then the actual value of the bus-tie current is subtracted from the set value of the bus-tie current to obtain the difference value of the bus-tie current, and the difference value of the bus-tie current is input to the first PI controller to obtain the reference value of the bus-tie.
In a possible embodiment, as shown in fig. 4, after S103, the method provided in this embodiment further includes:
if the actual value I of the bus-tie current bus_fb And if the preset condition is not met, setting the bus-tie reference value to be zero.
In this embodiment, if the actual value I of the bus-tie current is bus_fb Is not more than a preset current value I bus_H It is explained that the difference between the battery capacities of the two power supply devices is not large, and therefore, the bus tie reference value is set to zero without considering the bus tie current.
In one possible embodiment, as shown in fig. 4, the specific implementation flow of S105 includes:
inputting the battery current difference value of the current period into a second PI controller to obtain a first voltage value of the current period;
subtracting the first voltage value of the current period from the preset voltage value of the previous period to obtain a preset voltage difference value;
adding the preset voltage difference value and the bus-tie reference value to obtain a preset voltage value U of the current period ret 。
In a possible embodiment, after obtaining the preset voltage value of the current period, the method provided in this embodiment further includes:
and carrying out amplitude limiting on the preset voltage value of the current period.
In a possible embodiment, the independent control method for a dc power supply provided by this embodiment further includes:
if a power-down signal of another power supply device is monitored, judging whether the actual battery current of the current period is greater than the lower limit value of the equalized charging current, and if the actual battery current of the current period is greater than the lower limit value of the equalized charging current, keeping the set value of the equalized charging current unchanged;
if the actual battery current in the current period is less than or equal to the lower limit value of the equalizing charge current, taking the actual battery current in the current period as the setting value of the equalizing charge current;
calculating a difference value between the actual battery current and the set value of the equalized charging current to obtain a battery current difference value, calculating a preset voltage value of the current period based on the battery current difference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period.
In this embodiment, a dry contact of the mains supply power failure may be newly added to each power supply device, a monitoring unit of one power supply device acquires a dry contact signal of the mains supply power failure of another power supply device, and if the power supply device monitors a mains supply power failure signal of another power supply device, the independent control logic of S101 to S105 is not executed any more, but the dry contact signal is switched to the uniform charging control logic of a single power supply device. In the process of executing the equalizing charge control logic of a single power supply device, if the actual battery current in the current period is greater than the equalizing charge lower limit value, keeping the current equalizing charge current set value unchanged; if the actual battery current in the current period is smaller than or equal to the lower limit value of the equalizing charge current, taking the actual battery current in the current period as the set value of the equalizing charge current, keeping the set value of the equalizing charge current unchanged, and calculating the preset voltage value in the subsequent period until the actual battery current is larger than the lower limit value of the equalizing charge current.
After the setting value of the average charging current in the current period is determined, subtracting the actual battery current from the setting value of the average charging current to obtain a battery current difference value in the current period, and then inputting the battery current difference value into a second PI controller to obtain a first voltage value in the current period; subtracting the first voltage value of the current period from the preset voltage value of the previous period to obtain a preset voltage value U ret 。
Specifically, the lower average charging current limit value may be obtained by subtracting a unit preset current value from an initial set average charging current value, and for example, the unit preset current value may be 3A.
By the method, the normal operation of the direct-current power supply can be ensured, and the condition that the battery of one normal power supply device discharges due to the fact that the commercial power of the other normal power supply device is powered off is avoided.
In one embodiment of the present application, the battery capacities of the battery modules of the power supply devices are set to be different, and the simulation is performed by the above method, and the simulation diagrams are shown in fig. 5a to 5d, and it can be seen from the simulation diagrams: after the bus-tie current is brought into control, the charging current of the rectifier cabinet with smaller battery capacity can be controlled to be a set value of the uniform charging current, while the charging current of the rectifier cabinet with higher battery capacity can be controlled to be below the set value of the uniform charging current, and the system can also realize control, thereby ensuring that the current charging of the two cabinets can not have overcurrent.
In an embodiment of the present invention, when performing a battery discharge test and an insulation test on a dc power supply, each power supply device needs to establish a communication connection to implement time-sharing execution of the two tests.
In an embodiment of the present invention, after S102, the method further includes:
judging whether the fuse between the two rectifier cabinets is disconnected, if not, continuing to execute the step S103;
if the fuse between the two rectifier cabinets is disconnected, removing the bus-tie current control loop, and directly executing the following steps:
and calculating a preset voltage value of the current period based on the battery current difference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period.
Specifically, the steps are as follows:
inputting the battery current difference value of the current period into a second PI controller to obtain a first voltage value of the current period;
and summing the first voltage value of the current period and the preset voltage value of the previous period to obtain the preset voltage value of the current period.
It can be known from the above embodiments that the voltage control between the power devices of the present embodiment is independent, the control period is fast, and even if there is a communication failure, the correct control can still be ensured. In addition, by the method provided by the embodiment, the current of the bus-bar section can be guaranteed to be zero under the optimal condition, then the voltage can be clamped, the voltage can be guaranteed to enable the battery module with the lower capacity to achieve the uniform charging current, and the current of the other battery module is not over-current.
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.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 6 is a schematic structural diagram of an independent control device for a dc power supply according to an embodiment of the present invention, where the independent control device for a dc power supply is applied to a monitoring unit corresponding to any power supply device, and for convenience of description, only parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 6, the independent control apparatus 100 for dc power supply includes:
an actual battery current obtaining module 110, configured to obtain an actual battery current of a battery module corresponding to the current power supply device in the current period;
a battery current difference value calculating module 120, configured to calculate a difference value between the actual battery current and a set value of an average charging current, so as to obtain a battery current difference value;
the bus current judgment module 130 is configured to obtain an actual bus tie current value of a bus tie section between at least two rectifier cabinets in a current period, and judge whether the actual bus tie current value meets a preset condition;
a bus tie reference value calculating module 140, configured to calculate a bus tie reference value of a current period based on the actual value of the bus tie current if the actual value of the bus tie current meets a preset condition;
and the voltage control module 150 is configured to calculate a preset voltage value of the current period based on the battery current difference value and the bus tie reference value of the current period, and control the output voltage of the rectifier cabinet corresponding to the current power supply device based on the preset voltage value of the current period.
In one possible embodiment, the buscouple reference value calculation module 140 includes:
subtracting the actual value of the bus-tie current from the set value of the bus-tie current to obtain a bus-tie current difference value of the current period;
and inputting the bus tie current difference value into a first PI controller to obtain a bus tie reference value of the current period.
In one possible embodiment, the independent control device 100 for dc power supply further comprises a bus tie reference value zeroing module for:
and if the actual value of the bus-tie current does not meet the preset condition, setting the reference value of the bus-tie to be zero.
In a possible embodiment, the preset condition is that an absolute value of the actual value of the bus-coupled current is greater than a preset current value.
In one possible embodiment, the voltage control module 150 includes:
inputting the battery current difference value of the current period into a second PI controller to obtain a first voltage value of the current period;
subtracting the first voltage value of the current period from the preset voltage value of the previous period to obtain a preset voltage difference value;
and adding the preset voltage difference value and the bus-coupled reference value to obtain a preset voltage value of the current period.
In one possible embodiment, the independent control device 100 for dc power further comprises:
and the amplitude limiting module is used for carrying out amplitude limiting on the preset voltage value of the current period.
The independent control device of the direct-current power supply provided by the embodiment of the invention firstly obtains the actual battery current of the battery module corresponding to the current power supply device in the current period; calculating the difference between the actual battery current and the set value of the average charging current to obtain a battery current difference; acquiring a bus-tie current actual value of a bus-tie section between at least two rectifier cabinets in the current period, and judging whether the bus-tie current actual value meets a preset condition or not; if the actual value of the bus-coupled current meets the preset condition, calculating a bus-coupled reference value of the current period based on the actual value of the bus-coupled current; and finally, calculating a preset voltage value of the current period based on the battery current difference value and the bus coupler reference value of the current period, and controlling the output voltage of the rectifier cabinet corresponding to the current power supply device based on the preset voltage value of the current period. According to the embodiment, when the current of the bus-bar connection section does not meet the preset condition, the bus current is controlled on the basis of the uniform charging logic, so that the current of the bus-bar connection section is zero, and the overcurrent problem of the battery current is avoided.
The independent control device for the dc power supply provided in this embodiment may be used to implement the above-mentioned embodiment of the independent control method for the dc power supply, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic diagram of a monitoring unit according to an embodiment of the present invention. As shown in fig. 7, the monitoring unit 7 of this embodiment includes: a processor 70, a memory 71 and a computer program 72 stored in said memory 71 and executable on said processor 70. The processor 70 implements the steps in the above-mentioned embodiments of the independent control method for each dc power supply, such as the steps S101 to S105 shown in fig. 3, when executing the computer program 72. Alternatively, the processor 70, when executing the computer program 72, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 110 to 150 shown in fig. 6.
Illustratively, the computer program 72 may be partitioned into one or more modules/units that are stored in the memory 71 and executed by the processor 70 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 72 in the monitoring unit 7.
The monitoring unit 7 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The monitoring unit 7 may include, but is not limited to, a processor 70 and a memory 71. It will be appreciated by those skilled in the art that fig. 7 is only an example of the monitoring unit 7, and does not constitute a limitation of the monitoring unit 7, and may include more or less components than those shown, or combine some components, or different components, for example, the monitoring unit may further include an input-output device, a network access device, a bus, etc.
The Processor 70 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 71 may be an internal storage unit of the monitoring unit 7, such as a hard disk or a memory of the monitoring unit 7. The memory 71 may also be an external storage device of the monitoring unit 7, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the monitoring unit 7. Further, the memory 71 may also include both an internal storage unit and an external storage device of the monitoring unit 7. The memory 71 is used for storing the computer program and other programs and data required by the monitoring unit. The memory 71 may also be used to temporarily store data that has been output or is to be output.
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 to perform all or part of the above-mentioned functions. 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 used for distinguishing one functional unit from another, 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 description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any 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 technical 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 invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/monitoring unit and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/monitoring unit are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, 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.
The 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 of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the method for independently controlling each dc power supply may be implemented. 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 the computer program code, recording medium, usb 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 medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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. The independent control method of the direct current power supply is characterized in that the direct current power supply comprises a direct current bus coupler device and at least two power supply devices, wherein each power supply device comprises a rectifier cabinet, a battery module and a monitoring unit;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus coupler is connected between the direct current output ends of at least two rectifier cabinets;
the method is applied to a monitoring unit corresponding to any power supply device, and comprises the following steps:
acquiring the actual battery current of a battery module corresponding to the current power supply device in the current period;
calculating the difference between the actual battery current and the set value of the average charging current to obtain a battery current difference;
acquiring a bus-coupled current actual value of a bus-coupled section between at least two rectifier cabinets in a current period, and judging whether the bus-coupled current actual value meets a preset condition or not;
if the actual value of the bus tie current meets the preset condition, calculating a bus tie reference value of the current period based on the actual value of the bus tie current;
and calculating a preset voltage value of the current period based on the battery current difference value and the bus coupler reference value of the current period, and controlling the output voltage of the rectifier cabinet corresponding to the current power supply device based on the preset voltage value of the current period.
2. The independent control method of the direct current power supply according to claim 1, wherein the calculating the current cycle of the bus tie reference value based on the actual value of the bus tie current comprises:
subtracting the actual value of the bus-tie current from the set value of the bus-tie current to obtain a bus-tie current difference value of the current period;
and inputting the bus tie current difference value into a first PI controller to obtain a bus tie reference value of the current period.
3. The independent control method of a direct current power supply according to claim 1, wherein after said determining whether the actual value of the bus tie current satisfies a preset condition, the method further comprises:
and if the actual value of the bus-tie current does not meet the preset condition, setting the reference value of the bus-tie to be zero.
4. The independent control method of a direct current power supply according to claim 1, wherein the preset condition is that an absolute value of the actual value of the bus tie current is larger than a preset current value.
5. The independent control method of the DC power supply according to claim 1, wherein the calculating the preset voltage value of the current cycle based on the battery current difference value of the current cycle and the bus-coupled reference value comprises:
inputting the battery current difference value of the current period into a second PI controller to obtain a first voltage value of the current period;
subtracting the first voltage value of the current period from the preset voltage value of the previous period to obtain a preset voltage difference value;
and adding the preset voltage difference value and the bus-coupled reference value to obtain a preset voltage value of the current period.
6. The method of independent control of a dc power supply of claim 5, further comprising:
if a power failure signal of another power supply device is monitored, judging whether the actual battery current of the current period is greater than the lower limit value of the equalized charging current, and if the actual battery current of the current period is greater than the lower limit value of the equalized charging current, keeping the set value of the equalized charging current unchanged;
if the actual battery current in the current period is less than or equal to the lower limit value of the equalizing charge current, taking the actual battery current in the current period as the setting value of the equalizing charge current;
calculating a difference value between the actual battery current and the set value of the equalized charging current to obtain a battery current difference value, calculating a preset voltage value of the current period based on the battery current difference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period.
7. The independent control device of the direct current power supply is characterized in that the direct current power supply comprises a direct current bus coupler device and at least two power supply devices, wherein each power supply device comprises a rectifier cabinet, a battery module and a monitoring unit;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus coupler is connected between the direct current output ends of at least two rectifier cabinets;
the independent control device of the direct current power supply is applied to a monitoring unit corresponding to any power supply device, and comprises:
the actual battery current acquisition module is used for acquiring the actual battery current of the battery module corresponding to the current power supply device in the current period;
the battery current difference value calculating module is used for calculating the difference value between the actual battery current and the set value of the average charging current to obtain a battery current difference value;
the bus current judgment module is used for acquiring the actual bus-tie current value of a bus-tie section between at least two rectifier cabinets in the current period and judging whether the actual bus-tie current value meets a preset condition or not;
the bus tie reference value calculating module is used for calculating a bus tie reference value of the current period based on the actual bus tie current value if the actual bus tie current value meets a preset condition;
and the voltage control module is used for calculating a preset voltage value of the current period based on the battery current difference value and the bus coupler reference value of the current period, and controlling the output voltage of the current power supply device corresponding to the rectifier cabinet based on the preset voltage value of the current period.
8. A monitoring unit comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the memory is adapted to store the computer program and the processor is adapted to call and execute the computer program stored in the memory, performing the method according to any of claims 1 to 6.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
10. A direct current power supply, comprising: a dc bus tie device and at least two power supply devices, the power supply devices including a rectifier cabinet, a battery module and a monitoring unit as claimed in claim 8;
the direct current output end of each rectifier cabinet is connected with the corresponding battery module, and the direct current bus connection device is connected between the direct current output ends of at least two rectifier cabinets.
CN202211216370.XA 2022-09-30 2022-09-30 Independent control method of direct current power supply and related device Pending CN115498753A (en)

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CN202211216370.XA CN115498753A (en) 2022-09-30 2022-09-30 Independent control method of direct current power supply and related device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211216370.XA CN115498753A (en) 2022-09-30 2022-09-30 Independent control method of direct current power supply and related device

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CN115498753A true CN115498753A (en) 2022-12-20

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