CN119182212B - Control method and related device of DC-DC converter - Google Patents
Control method and related device of DC-DC converter Download PDFInfo
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- CN119182212B CN119182212B CN202411660914.0A CN202411660914A CN119182212B CN 119182212 B CN119182212 B CN 119182212B CN 202411660914 A CN202411660914 A CN 202411660914A CN 119182212 B CN119182212 B CN 119182212B
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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
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
Abstract
本申请提供了一种直流‑直流变换器的控制方法及相关装置，应用于直流‑直流变换器，所述方法包括：获取直流母线电压；若直流母线电压大于第一预设电压，则判断是否符合第一预设条件，第一预设条件是指直流‑直流变换器对应的同组电池组存在充电需求、且其他直流‑直流变换器的工作模式均为热备份模式；若符合，则切换自身的工作模式为充电模式；若不符合，则切换自身的工作模式为热备份模式，热备份模式下主功率MOS管保持常断状态。如此，既能够降低MOS管的开关损耗，又能快速响应传能需求及时切换工作模式，同时也能避免多组电池组同时充电导致直流母线过载的情况，提高系统安全性和稳定性。
The present application provides a control method and related device for a DC-DC converter, which is applied to a DC-DC converter, and the method includes: obtaining a DC bus voltage; if the DC bus voltage is greater than a first preset voltage, determining whether it meets a first preset condition, the first preset condition being that the battery pack of the same group corresponding to the DC-DC converter has a charging demand, and the working modes of other DC-DC converters are all hot backup modes; if it meets the requirements, switching its own working mode to a charging mode; if it does not meet the requirements, switching its own working mode to a hot backup mode, and the main power MOS tube remains in a normally off state in the hot backup mode. In this way, the switching loss of the MOS tube can be reduced, and the working mode can be switched in time in response to the energy transmission demand quickly, and the situation of DC bus overload caused by charging multiple battery packs at the same time can be avoided, thereby improving the safety and stability of the system.
Description
Technical Field
The present application relates to the field of electronic power, and in particular, to a method and an apparatus for controlling a dc-dc converter.
Background
Along with the rapid development of power electronics technology, the application of bidirectional direct current-direct current (DC-DC) converters is more and more, for example, in a DC bus power supply system, the main purpose of the bidirectional direct current-direct current (DC-DC) converter is to support the DC bus voltage through a battery pack in time when the DC bus is powered down, ensure the normal operation of a DC load, and charge the battery pack when the DC bus voltage is normal.
However, the bidirectional dc-dc converter in the prior art has a large switching loss in light load and no-load states, and the charge and discharge control of the bidirectional dc-dc converter in the prior art is not reasonable, for example, when the charging requirement sent by the Battery management system (Battery MANAGEMENT SYSTEM, BMS) of the same Battery pack is detected, the bidirectional dc-dc converter is immediately switched to a charging mode to charge the Battery packs, so that the system has a situation that multiple Battery packs are charged simultaneously. When a plurality of groups of battery packs are charged simultaneously, if a rated direct current load is suddenly added so that the direct current load side reaches the rated output capacity of the direct current bus, the direct current bus is in overload and voltage drop risk.
Disclosure of Invention
The embodiment of the application provides a control method and a related device of a direct current-direct current converter, which are used for optimizing control logic of the direct current-direct current converter, reducing switching loss of MOS (metal oxide semiconductor) tubes, avoiding overload of a direct current bus caused by simultaneous charging of a plurality of groups of battery packs and improving safety and stability of a system.
In a first aspect, an embodiment of the present application provides a control method of a dc-dc converter, which is applied to a dc-dc converter in a dc bus power supply system, where the dc bus power supply system includes a plurality of dc-dc converters, a plurality of battery packs, and a dc load, the plurality of dc-dc converters and the plurality of battery packs are connected in one-to-one correspondence, and each dc-dc converter is connected to the dc load through a dc bus, and the method includes:
obtaining a direct current bus voltage;
If the voltage of the direct current bus is larger than a first preset voltage, judging whether the voltage meets a first preset condition, wherein the first preset condition refers to that the same group of battery packs corresponding to the direct current-direct current converter have a charging requirement, and the working modes of other direct current-direct current converters are all hot backup modes, the working modes comprise a hot backup mode, a charging mode and a discharging mode, the hot backup mode refers to the working mode that the MOS tube of the direct current-direct current converter keeps a normally-off state, the charging mode refers to the working mode that the MOS tube of the direct current-direct current converter keeps a normally-on state so that energy flows to the same group of battery packs, and the discharging mode refers to the working mode that the MOS tube of the direct current-direct current converter keeps a normally-on state so that energy flows to the direct current bus;
if yes, switching the working mode of the charging device to be the charging mode;
If not, the working mode of the device is switched to be the hot backup mode.
In a second aspect, an embodiment of the present application provides a control device for a dc-dc converter, which is applied to a dc-dc converter in a dc bus power supply system, where the dc bus power supply system includes a plurality of dc-dc converters, a plurality of battery packs, and a dc load, the plurality of dc-dc converters and the plurality of battery packs are connected in one-to-one correspondence, and each dc-dc converter is connected to the dc load through a dc bus, and the device includes:
The acquisition unit is used for acquiring the voltage of the direct current bus;
The judging unit is configured to judge whether a first preset condition is met if the voltage of the dc bus is greater than a first preset voltage, where the first preset condition refers to that a charging requirement exists on the same battery set corresponding to the dc-dc converter, and working modes of other dc-dc converters are all hot standby modes, the working modes include the hot standby mode, a charging mode and a discharging mode, the hot standby mode refers to a working mode in which an MOS transistor of the dc-dc converter is kept in a normally-off state, the charging mode refers to a working mode in which an MOS transistor of the dc-dc converter is kept in a normally-on state so that energy flows to the same battery set, and the discharging mode refers to a working mode in which an MOS transistor of the dc-dc converter is kept in a normally-on state so that energy flows to the dc bus;
And the switching unit is used for switching the working mode of the switching unit to be the charging mode if the working mode of the switching unit is in accordance with the charging mode, and switching the working mode of the switching unit to be the hot backup mode if the working mode of the switching unit is not in accordance with the charging mode.
In a third aspect, an embodiment of the present application provides a dc-dc converter, comprising a controller including a processor, a memory, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps in the first aspect of the embodiment of the present application.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program/instruction which when executed by a processor performs the steps of the first aspect of embodiments of the present application.
It can be seen that in the embodiment of the present application, after the dc-dc converter in the dc bus power supply system obtains the dc bus voltage, if the dc bus voltage is greater than a first preset voltage, it is determined whether the first preset condition is met, where the first preset condition is that the dc-dc converter has a charging requirement corresponding to the same group of battery packs, and the working modes of other dc-dc converters are all hot standby modes, if so, the working mode of the dc-dc converter is switched to be the charging mode, and if not, the working mode of the dc-dc converter is switched to be the hot standby mode. Therefore, under the normal working condition of the commercial power, even if the same group of battery packs have charging requirements, the direct current-direct current converter can not be immediately switched into a charging mode, but the states of other direct current-direct current converters are detected, and the charging mode is switched into the charging mode to charge the same group of battery packs only when the other direct current-direct current converters are in a hot standby mode, otherwise, the charging mode is switched into the hot standby mode, and the main power MOS tube in the hot standby mode is kept in a normally-off state, so that the switching loss of the MOS tube can be reduced, the working mode can be quickly switched in time in response to the energy transmission requirements, meanwhile, the condition that a plurality of groups of battery packs are charged simultaneously to cause overload of a direct current bus can be avoided, and the safety and the stability of the system are improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the 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 block diagram of a dc bus power supply system according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a control method of a dc-dc converter according to an embodiment of the present application;
FIG. 3 is an exemplary schematic diagram of a alternately switched discharge module provided in accordance with an embodiment of the present application;
fig. 4 is a schematic diagram of an energy flow of a dc bus power supply system in a charging mode according to an embodiment of the present application;
Fig. 5 is a schematic diagram of an energy flow of a dc bus power supply system in a discharging mode according to an embodiment of the present application;
Fig. 6 is a schematic diagram of an energy flow of a dc bus power supply system in a hot standby mode according to an embodiment of the present application;
Fig. 7 is a block diagram of a control device of a dc-dc converter according to an embodiment of the present application;
Fig. 8 is a block diagram of a control device of a dc-dc converter according to another embodiment of the present application;
Fig. 9 is a block diagram of a dc-dc converter according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a block diagram of a dc bus power supply system according to an embodiment of the present application. As shown in fig. 1, the dc bus power supply system 10 includes a plurality of dc-dc converters 11, a plurality of battery packs 12, and a dc load 13, the plurality of dc-dc converters 11 and the plurality of battery packs 12 are connected in one-to-one correspondence, and each dc-dc converter 11 is connected to the dc load 13 through a dc bus 14. In the embodiment of the present application, the dc-dc converter 11 specifically refers to a bidirectional dc-dc converter, and controls the energy flow direction by controlling the opening and closing of the MOS transistor. In this example, the dc bus power supply system 10 further includes an ac-dc converter 15, where a first end of the ac-dc converter 15 is connected to a mains supply end, specifically, a three-phase input end connected to the mains supply end through an a-phase, a B-phase, and a C-phase, and is connected to a protection ground line in the mains supply end through a PE, a second end is connected to the dc load 13 through the dc bus 14, and a third end is connected to a monitoring module 17 through a CAN bus 16, where the monitoring module 17 is configured to monitor a state of the dc bus power supply system 10. Wherein, the plurality of DC-DC converters 11 and the plurality of battery packs 12 are connected to the CAN bus to exchange status information in real time.
The following describes a control method of a dc-dc converter provided by the embodiment of the present application.
Referring to fig. 2, fig. 2 is a flow chart of a control method of a dc-dc converter according to an embodiment of the application, which is applied to the dc-dc converter 11 shown in fig. 1, and as shown in fig. 2, the method includes:
s201, obtaining a direct current bus voltage.
The direct current-direct current converter CAN conduct state information interaction through the CAN bus to obtain the voltage value of the direct current bus.
S202, if the voltage of the direct current bus is larger than a first preset voltage, judging whether the first preset condition is met.
If yes, S203 is executed, and if not, S204 is executed.
The first preset condition is that the same battery pack corresponding to the direct current-direct current converter has a charging requirement, the working modes of other direct current-direct current converters are all hot backup modes, the working modes comprise the hot backup mode, a charging mode and a discharging mode, the hot backup mode is that an MOS tube of the direct current-direct current converter keeps a normally-off state, the charging mode is that the MOS tube of the direct current-direct current converter keeps a normally-on state so that energy flows to the working modes of the same battery pack, and the discharging mode is that the MOS tube of the direct current-direct current converter keeps a normally-on state so that energy flows to the working mode of the direct current bus.
The hot standby mode is essentially a discharging mode without energy transfer, and the main power MOS tube in the hot standby mode is kept in a normally-off state, so that the switching loss can be reduced, the energy transfer requirement can be responded quickly, and the power failure of the direct current bus is avoided.
S203, switching the working mode of the battery to the charging mode.
S204, switching the working mode of the device to the hot standby mode.
The first preset voltage is an empirical value obtained through the prior data statistical analysis and can be used for monitoring the voltage state of the direct current bus. In this example, the dc bus voltage is greater than the first preset voltage, indicating that the dc bus is not powered down, and the dc-dc converter is not required to take power from the battery pack for support. At this time, if it is detected that the same battery pack has a charging requirement and the working modes of the other dc-dc converters are all hot standby modes, the working mode of the converter is switched to be a charging mode, and the same battery pack is charged. If the working modes of other DC-DC converters are not all the hot backup modes, the same group of batteries are not allowed to be charged, and the working modes of the other DC-DC converters are switched to the hot backup modes. For example, when the operation mode of the other dc-dc converter is the charging mode, if the same battery pack is still charged at this time, there may be a case where multiple battery packs are charged simultaneously in the system, which may cause an overload risk of the dc bus.
In other embodiments, under the working condition that the mains supply is powered down, the working mode of other dc-dc converters in the system is a discharging mode for supporting the dc bus, the energy flow direction of the system is from the battery pack to the dc bus, if the battery packs in the same group are still charged at this time, the energy flow direction of the part of the energy flow direction is from the dc bus to the battery pack, that is, the energy flow direction in the system generates conflict, so that the overall energy transmission efficiency of the system becomes low, the dc load side jumps from the light load to the rated dc load, and still the overload risk of the dc bus is caused. In addition, in the design of the dc bus power supply system, an n+1 redundancy backup scheme is generally designed, that is, under the working condition of power failure of the mains supply, the total power of the N dc-dc converters meets the maximum output power of the dc bus, and 1 redundancy dc-dc converter is backed up at the same time, so as to improve the reliability of the system. At this time, if the battery pack is charged, the system is not provided with the n+1 redundancy backup capability.
It can be seen that, in this example, after the dc-dc converter in the dc bus power supply system obtains the dc bus voltage, if the dc bus voltage is greater than a first preset voltage, it is determined whether the first preset condition is met, where the first preset condition is that the dc-dc converter has a charging requirement corresponding to the same group of battery packs, and the working modes of other dc-dc converters are all hot standby modes, if so, the working mode of the dc-dc converter is switched to be the charging mode, and if not, the working mode of the dc-dc converter is switched to be the hot standby mode. Therefore, under the condition that the commercial power is normal, even if the same group of battery packs have charging requirements, the direct current-direct current converter can not be immediately switched into a charging mode, but the states of other direct current-direct current converters are detected, and the charging mode is switched into the charging mode to charge the same group of battery packs only when the other direct current-direct current converters are in a hot standby mode, otherwise, the charging mode is switched into the hot standby mode, and the main power MOS tube in the hot standby mode is kept in a normally-off state, so that the switching loss of the MOS tube can be reduced, the working mode can be quickly switched in time in response to the energy transmission requirements, meanwhile, the condition that a plurality of groups of battery packs are charged simultaneously to cause overload of a direct current bus can be avoided, and the safety and the stability of the system are improved.
In one possible example, before the determining whether the first preset condition is met, the method further includes adjusting a set voltage on a dc bus side of the dc-dc converter to the first preset voltage to enable the dc-dc converter to increase energy transfer efficiency when the dc bus voltage is less than the first preset voltage.
The set voltage of the DC bus side of the DC-DC converter is a voltage which can be adjusted in real time, and different voltage states of the DC bus voltage are monitored by adjusting the voltage in real time. In this example, the voltage state of the dc bus is in a normal state, the voltage is set to a first preset voltage to continuously monitor whether the voltage of the dc bus drops, and after the voltage of the dc bus drops, the dc-dc converter can increase the energy transfer in time to pull the voltage of the dc bus up to a normal level due to the voltage difference on both sides of the dc bus.
In this example, when the voltage state of the dc bus is in the normal state, the dc-dc converter adjusts the set voltage on the dc bus side to the first preset voltage before determining whether the first preset condition is met, so that the state of the dc bus voltage can be continuously monitored, and further, after the dc bus voltage drops, the energy transfer can be timely increased to pull the dc bus voltage up to the normal level, so that the normal operation of the dc load is ensured.
In one possible example, after the dc bus voltage is obtained, the method further includes judging whether a discharge prohibiting instruction of the same group of battery packs is received if the dc bus voltage is smaller than or equal to the first preset voltage, if yes, switching an operation mode of the same group of battery packs to be the hot standby mode, if not, switching the operation mode of the same group of battery packs to be the discharge mode, sending output power of the same to a target dc-dc converter in the dc-dc converters, so that the target dc-dc converter generates a plurality of control signals corresponding to the dc-dc converters one by one according to the output power of each dc-dc converter, and receiving a target control signal from the target dc-dc converter and switching the operation mode of the same according to the target control signal.
When the voltage of the direct current bus is smaller than or equal to a first preset voltage, the direct current bus is indicated to be powered down or has a power failure risk, at the moment, the mains supply end is abnormal or powered down, and the direct current-direct current converter is required to take electricity from the battery pack to support the direct current bus so as to ensure the normal work of the direct current load. In this example, after detecting that the dc bus voltage is less than or equal to the first preset voltage, the dc-dc converter first determines whether a discharge prohibiting instruction of the same battery pack is received. The battery pack comprises a full-power state, a non-full-power state, an under-voltage state and a protection state. The full-power state is used for representing that the battery pack is allowed to discharge and has no charging requirement, the non-full-power state is used for representing that the battery pack is allowed to discharge and has charging requirement, the under-voltage state is used for representing that the battery pack is forbidden to discharge and has charging requirement, and the protection state is used for representing that the battery pack is forbidden to discharge and has no charging requirement. When the battery pack is in an under-voltage state or a protection state, the BMS uploads a discharge prohibition instruction to the CAN bus, so that the direct current-direct current converter CAN receive the discharge prohibition instruction through the CAN bus.
If the same group of battery packs allow discharge, the direct current-direct current converter is immediately switched to a discharge mode to support the direct current bus, the output voltage and current of the direct current-direct current converter are in a steady state after a period of time, and the direct current-direct current converter sends the output power of the direct current-direct current converter to the target direct current-direct current converter through the CAN bus. Wherein the transmitted output power specifically comprises the rated power of the DC-DC converter and the actual output power in the current state. The target DC-DC converter is a main module which is preset in the DC-DC converters and is used for integrally combining the charging and discharging behaviors of the DC-DC converters. Specifically, the definition may be based on the number of the dc-dc converter, for example, the dc-dc converter with the number 1 is the master module, and the dc-dc converters with other numbers are all slave modules. In this example, the target dc-dc converter is capable of receiving the output powers of the dc-dc converters for which all the battery packs are permitted to discharge, and generating a plurality of control signals corresponding to the plurality of dc-dc converters one by one based thereon. Wherein the control signal is used for indicating discharge or non-discharge. It will be appreciated that the master module takes some time to generate the control signal based on the output power uploaded by the respective slave module. During this period, the dc-dc converter will continue to maintain the discharge mode to support the dc bus that has been powered down, ensuring that the ability to support the bus is sufficient until the target control signal from the target dc-dc converter is received, and then switch its own operating mode according to the target control signal.
In this example, when the voltage of the dc bus is less than or equal to the first preset voltage, the battery pack is required to discharge and support the dc bus, at this time, the dc-dc converter determines whether a discharge prohibiting instruction of the same battery pack is received, if yes, it is switched to a hot standby mode, if not, the working mode of the dc converter is immediately switched to a discharge mode and supports the dc bus, and after the output voltage and current are stable, the dc converter sends its output power to the target dc-dc converter to wait for generating a control signal, and after receiving the target control signal, the working mode of the dc converter is switched according to the target control signal. When the system needs the battery pack to discharge and support the direct current bus, the direct current-direct current converter can firstly judge the state of the battery packs in the same group, and maintain a hot standby mode when the discharging is forbidden, so that the main power MOS tube keeps a normally-off state, the switching loss of the MOS tube can be reduced, the working mode can be quickly switched in response to the energy transmission requirement, meanwhile, the system can be immediately switched to the discharging mode to support the direct current bus when the discharging is allowed, and the power is transmitted to the main module after the output is stable, and the main module integrally manages the discharging control of each direct current-direct current converter, so that the discharging control of the system is more reasonable, the integral loss of the system is reduced, and the service life of the system is prolonged.
In other possible examples, after the fact that the discharge prohibition instruction of the same battery pack is not received is determined, the method further comprises the steps of switching the working mode of the method to be the discharge mode, sending output power of the method to a target direct current-direct current converter in the plurality of direct current-direct current converters, and switching the working mode of the method to be the hot standby mode if a control signal of the target direct current-direct current converter is not detected when the count of the discharge timer reaches a preset value. The preset value is an empirical value obtained through statistical analysis in advance and is used for representing the time required from the time when the power failure of the DC bus voltage is detected to the time when the target DC-DC converter outputs a control signal. In this example, when the dc bus voltage is greater than a first preset voltage, the discharge timer in the dc bus power supply system is assigned to 0, and when it is detected that the dc bus voltage is less than or equal to the first preset voltage, that is, the dc bus is powered down, the discharge timer is controlled to start counting, so that the discharge time of each dc-dc converter after the dc bus is powered down is counted in real time, and when the count of the discharge timer reaches a preset value and no control signal is detected, the dc-dc converter defaults to determine that the target dc-dc converter does not indicate discharge.
In one possible example, the switching of the self-operating mode according to the target control signal includes switching the self-operating mode to the discharging mode if the target control signal indicates discharging, adjusting a set voltage on a dc bus side of the dc-dc converter to a second preset voltage if the target control signal does not indicate discharging, and switching the self-operating mode to the hot standby mode, and switching the self-operating mode to the discharging mode when the dc bus voltage is less than or equal to the second preset voltage.
If the target control signal indicates discharge, that is, indicates that the target dc-dc converter takes electricity from the battery pack to support the dc bus after calculation overall, the target dc-dc converter continues to maintain its working mode as discharge mode. If the target control signal does not indicate discharge, namely the target DC-DC converter is indicated to take electricity from the battery pack to support the DC bus after calculation overall, the set voltage on the DC bus side is adjusted to be a second preset voltage, and the battery pack is switched to a hot standby mode. The second preset voltage is similar to the first preset voltage in function, and is used for continuously monitoring whether the voltage of the direct current bus drops further or not and increasing energy transmission in time after the voltage drops. In this example, the dc bus has been powered down, and the target dc-dc converter does not instruct itself to discharge, at this time, the dc-dc converter switches to the hot standby mode, but still needs to continuously monitor whether the dc bus voltage will drop further, and when the dc bus voltage drops further, that is, when the dc bus voltage is less than or equal to the second preset voltage, the dc bus is switched to the discharge mode to support the dc bus. It will be appreciated that the second preset voltage is less than the first preset voltage, in this example, the second preset voltage is equal to the first preset voltage minus a secondary hot standby mode differential voltage, the secondary hot standby mode differential voltage being used to characterize the extent to which the dc bus is further powered down.
In this example, when a control signal indicating discharge is received, the self working mode is switched to a discharge mode, when a control signal not indicating discharge is received, the set voltage on the side of the self direct current bus is adjusted to a second preset voltage, and the self working mode is switched to a hot standby mode, so as to continuously monitor whether the direct current bus voltage is further powered down, and when the direct current bus voltage is less than or equal to the second preset voltage, the self working mode is switched to the discharge mode to support the direct current bus. Therefore, the direct current-direct current converter can respond to the instruction issued by the target direct current-direct current converter after calculation overall, further power failure of the direct current bus can be avoided, and the safety and stability of the system are improved.
In one possible example, the sending the output power of the target dc-dc converter to the target dc-dc converters of the dc-dc converters to enable the target dc-dc converter to generate a plurality of control signals corresponding to the dc-dc converters one by one according to the output power of each dc-dc converter includes sending the output power of the target dc-dc converter to enable the target dc-dc converter to perform operations of calculating a total output power according to the output power of each dc-dc converter, calculating a minimum required number according to the total output power and the rated power of each dc-dc converter, generating X first control signals and Y second control signals, wherein y=n-X, X is the minimum required number, N is the number of dc-dc converters in the dc power supply system, and the first control signals indicate that the discharge is not indicated by the second control signals.
After receiving the actual output power and rated power of each direct current-direct current converter, the target direct current-direct current converter calculates total output power, wherein the total output power specifically refers to the actual output power sum of each direct current-direct current converter. And further, the minimum required quantity X which needs to work in the current discharging activity is calculated according to the total output power and the rated power of each DC-DC converter, so that X first control signals indicating discharging and (N-X) second control signals not indicating discharging are generated, and the discharging control of each DC-DC converter is managed in an overall mode, so that the discharging control of the system is more reasonable.
In this example, after the dc-dc converter sends its own output power to the target dc-dc converter, the target dc-dc converter calculates the total output power of the system, further calculates the minimum required number of dc-dc converters that need to be switched to the discharge mode, and generates a corresponding number of first control signals indicating discharge and a remaining number of second control signals not indicating discharge. Therefore, N DC-DC converters in the system are not required to be switched into a discharge mode, and only the least DC-DC converters are used for supporting the DC bus, so that the overall loss of the system is effectively reduced, and the service life of the system is prolonged.
In one possible example, the rated power of each dc-dc converter is the same, and the minimum required number is calculated by the target dc-dc converter according to the total output power and the rated power of each dc-dc converter by the following formula that x=ceiling (P1/P2).
Wherein, CEILING () is an upward rounding function, P1 is the total output power, and P2 is the rated power of each DC-DC converter. For example, assuming that P1 is 2500W and P2 is 300W, the minimum required number X is calculated to be 9, that is, at least 9 dc-dc converters are required to be switched to the discharging mode to take electricity from the corresponding battery pack to support the dc bus. In other embodiments, the minimum required number X may also be calculated using a ROUNDUP function, which is not limited only herein.
In this example, the target dc-dc converter calculates the minimum required number of dc-dc converters to be switched to the discharge mode in the current discharge activity by calling the discharging function, thereby improving the accuracy of the calculation result.
In one possible example, the target DC-DC converter further performs an operation of dividing the plurality of DC-DC converters into a first queue and a second queue after generating X first control signals and Y second control signals, the first queue including X DC-DC converters and the second queue including Y DC-DC converters, transmitting the first control signals to each DC-DC converter in the first queue and the second queue, transmitting the second control signals to each DC-DC converter in the second queue, moving a first DC-DC converter in the first queue to a last queue of the second queue after a preset time period, and moving a first DC-DC converter in the second queue to a last queue of the first queue to update the first and the second queues, and repeating the operations until the first queue is at a high voltage.
The dividing the plurality of dc-dc converters into the first queue and the second queue may specifically be performed by dividing the plurality of dc-dc converters into a first queue and a second queue according to a number of each dc-dc converter. For example, the dc-dc converters numbered 1 to X are placed in a first queue, and the dc-dc converters numbered x+1 to N are placed in a second queue, i.e., the first queue includes the first X dc-dc converters and the second queue includes the last Y dc-dc converters. After the queue is divided, X first control signals are sent to X DC-DC converters in the first queue so that the X DC-DC converters can switch the working modes of the X DC-DC converters to be a discharging mode according to the first control signals, Y second control signals are sent to Y DC-DC converters in the second queue so that the Y DC-DC converters can adjust the set voltage of the DC bus side of the Y DC-DC converters to be a second preset voltage according to the second control signals and switch the working modes of the Y DC-DC converters to be a hot standby mode, and whether the DC buses are further powered down or not is continuously monitored.
After a preset period of time, the target DC-DC converter moves the first DC-DC converter in the first queue to the end of the second queue, and moves the first DC-DC converter in the second queue to the end of the first queue. For example, the first queue includes the dc-dc converters numbered 1 to X, the second queue includes the dc-dc converters numbered x+1 to N, then, as shown in fig. 3, the dc-dc converter numbered 1 is moved to the last queue position of the second queue, and the dc-dc converter numbered x+1 is moved to the last queue position of the first queue, so as to obtain the updated first queue and the updated second queue, and then, the above procedure is repeated, that is, X first control signals are sent to the updated first queue, and Y second control signals are sent to the updated second queue for a preset duration.
In this example, after dividing the dc-dc converters in the dc bus power supply system into the first queue and the second queue, the target dc-dc converter sends a corresponding control signal to centrally manage the discharging behavior of the system, and alternately switches the discharging modules, so as to balance the working durations of all the dc-dc converters, and effectively prolong the service life of the system.
For a better understanding of the application, the energy flow direction of the dc bus power supply system in the different modes of operation is described below with reference to the drawings. Referring to fig. 4, fig. 4 is an energy flow diagram of a dc bus power supply system in a charging mode according to an embodiment of the present application, as shown in fig. 4, when a dc-dc converter is switched to the charging mode, energy flows from the dc bus to the battery pack, and at the same time, the dc bus normally supplies power to a dc load, and the energy flows from the dc bus to the dc load. Referring to fig. 5, fig. 5 is an energy flow schematic diagram of a dc bus power supply system in a discharging mode, where as shown in fig. 5, when a dc bus is powered down or abnormal, a dc-dc converter is switched to a discharging mode to take electricity from a battery pack to support the dc bus, and energy flows from the battery pack to the dc bus, so that the dc bus voltage is sufficient to ensure normal operation of a dc load, and the energy flows from the dc bus to the dc load. Referring to fig. 6, fig. 6 is an energy flow diagram of a dc bus power supply system in a hot standby mode, as shown in fig. 6, and it is assumed that the present example is a situation that a mains supply end is normal and a dc-dc converter is not required to take power to support, at this time, the working modes of the dc-dc converter in the system are all hot standby modes, no energy flows, and at the same time, the mains supply end normally supplies power to a dc bus through the ac-dc converter, so as to ensure normal operation of a dc load, and energy flows from the dc bus to the dc load.
In accordance with the above-mentioned embodiment, referring to fig. 7, fig. 7 is a block diagram of a control device for a dc-dc converter according to the embodiment of the present application, where the control device for a dc-dc converter is applied to a dc-dc converter 11 shown in fig. 1, and the control device 70 for a dc-dc converter includes an obtaining unit 701 for obtaining a dc bus voltage, a determining unit 702 for determining whether a first preset condition is met if the dc bus voltage is greater than a first preset voltage, where the first preset condition is that a charging requirement exists in a same battery pack corresponding to the dc-dc converter, and the operating modes of other dc-dc converters are all hot standby modes, where the hot standby mode is that an MOS tube of the dc-dc converter is kept in a normally-off state, where the charging mode is that the MOS tube of the dc-dc converter is kept in a normally-on state so as to enable energy to flow to the same battery pack, and where the operating modes of the MOS tube of the dc-dc converter is switched is not kept in a normally-off state, and where the operating modes of the MOS tube of the dc-dc converter is switched to enable the MOS tube of the dc-dc converter to be switched to keep the normally-off state, and the operating modes are not met.
In one possible example, the control device 70 of the dc-dc converter is further configured to adjust the set voltage on the dc bus side of the dc-dc converter to the first preset voltage before the determining whether the first preset condition is met, so that the dc-dc converter can increase the energy transfer efficiency when the dc bus voltage is smaller than the first preset voltage.
In one possible example, after the dc bus voltage is obtained, the control device 70 of the dc-dc converter is further configured to determine whether a discharge prohibiting instruction of the same battery pack is received if the dc bus voltage is less than or equal to the first preset voltage, if yes, switch the operation mode of the dc-dc converter to the hot standby mode, if not, switch the operation mode of the dc-dc converter to the discharge mode, send the output power of the dc-dc converter to a target dc-dc converter of the dc-dc converters, so that the target dc-dc converter generates a plurality of control signals corresponding to the dc-dc converters one by one according to the output power of each dc-dc converter, and receive the target control signals from the target dc-dc converter, and switch the operation mode of the dc-dc converter according to the target control signals.
In one possible example, in the aspect of switching the operation mode of the dc-dc converter according to the target control signal, the control device 70 of the dc-dc converter is specifically configured to switch the operation mode of the dc-dc converter to the discharge mode if the target control signal indicates discharge, adjust the set voltage on the dc bus side of the dc-dc converter to a second preset voltage and switch the operation mode of the dc-dc converter to the hot standby mode if the target control signal does not indicate discharge, and switch the operation mode of the dc-dc converter to the discharge mode when the dc bus voltage is less than or equal to the second preset voltage.
In one possible example, in terms of the sending of the output power of the target dc-dc converter to the plurality of dc-dc converters, so that the target dc-dc converter generates a plurality of control signals corresponding to the plurality of dc-dc converters one by one according to the output power of each dc-dc converter, the control device 70 of the dc-dc converter is specifically configured to send the output power of the target dc-dc converter to the plurality of dc-dc converters, so that the target dc-dc converter performs an operation of calculating a total output power according to the output power of each dc-dc converter, calculating a minimum required number according to the total output power and the rated power of each dc-dc converter, and generating X first control signals and Y second control signals, where y=n-X, X is the minimum required number, N is the number of dc-dc converters in the dc bus system, and the first control signals indicate that the discharge is not indicated.
In one possible example, the rated power of each dc-dc converter is the same, and the minimum required number is calculated by the target dc-dc converter according to the total output power and the rated power of each dc-dc converter by the following formula:
X= CEILING(P1/P2);
Wherein, CEILING () is an upward rounding function, P1 is the total output power, and P2 is the rated power of each DC-DC converter.
In one possible example, the target DC-DC converter further performs an operation of dividing the plurality of DC-DC converters into a first queue and a second queue after generating X first control signals and Y second control signals, the first queue including X DC-DC converters and the second queue including Y DC-DC converters, transmitting the first control signals to each DC-DC converter in the first queue and the second queue, transmitting the second control signals to each DC-DC converter in the second queue, moving a first DC-DC converter in the first queue to a last queue of the second queue after a preset time period, and moving a first DC-DC converter in the second queue to a last queue of the first queue to update the first and the second queues, and repeating the operations until the first queue is at a high voltage.
It can be understood that, since the method embodiment and the apparatus embodiment are different presentation forms of the same technical concept, the content of the method embodiment portion in the present application should be synchronously adapted to the apparatus embodiment portion, which is not described herein.
In the case of using an integrated unit, as shown in fig. 8, fig. 8 is a block diagram of a control device for a dc-dc converter according to another embodiment of the present application, and in fig. 8, a control device 70 for a dc-dc converter includes a processing module 72 and a communication module 71. The processing module 72 is configured to control and manage actions of the control device of the dc-dc converter, for example, performing steps of the acquisition unit 701, the determination unit 702, and the switching unit 703, and/or performing other processes of the techniques described herein. The communication module 71 is used to support the interaction between the control means of the dc-dc converter and other devices. As shown in fig. 8, the control device of the dc-dc converter may further include a memory module 73, where the memory module 73 is configured to store program codes and data of the control device of the dc-dc converter.
All relevant contents of each scenario related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein. The control device 70 of the dc-dc converter may perform the control method of the dc-dc converter shown in fig. 2.
Referring to fig. 9, fig. 9 is a block diagram of a dc-dc converter according to an embodiment of the application. As shown in fig. 9, the dc-dc converter 11 includes a controller 90, and the controller 90 may include one or more components including a processor 901, a memory 902 coupled to the processor 901, wherein the memory 902 may store one or more computer programs that may be configured to implement the methods described in the above embodiments when executed by the one or more processors 901. In particular, the controller 90 may be implemented as an MCU (Microcontroller Unit, micro-control unit).
It will be appreciated that the dc-dc converter may include more or fewer structural elements than those shown in the block diagrams described above, and is not limited in this regard.
The embodiments of the present application also provide a computer storage medium having stored thereon a computer program/instruction which, when executed by a processor, performs part or all of the steps of any of the methods described in the method embodiments above.
It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, 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 with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
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 on 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 invention may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
Although the present invention is disclosed above, the present invention is not limited thereto. Variations and modifications, including combinations of the different functions and implementation steps, as well as embodiments of the software and hardware, may be readily apparent to those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
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| CN115882442A (en) * | 2023-02-09 | 2023-03-31 | 阳光氢能科技有限公司 | Power parallel system and direct current bus voltage control method thereof |
| CN117879350A (en) * | 2023-12-22 | 2024-04-12 | 深圳市正浩创新科技股份有限公司 | Control method of bidirectional direct current converter and energy storage equipment |
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| CN115882442A (en) * | 2023-02-09 | 2023-03-31 | 阳光氢能科技有限公司 | Power parallel system and direct current bus voltage control method thereof |
| CN117879350A (en) * | 2023-12-22 | 2024-04-12 | 深圳市正浩创新科技股份有限公司 | Control method of bidirectional direct current converter and energy storage equipment |
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