CN111934414B - Control method of standby power control system of power change station and power change station - Google Patents
Control method of standby power control system of power change station and power change station Download PDFInfo
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- CN111934414B CN111934414B CN202010690615.7A CN202010690615A CN111934414B CN 111934414 B CN111934414 B CN 111934414B CN 202010690615 A CN202010690615 A CN 202010690615A CN 111934414 B CN111934414 B CN 111934414B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/80—Exchanging energy storage elements, e.g. removable batteries
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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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a control method of a standby power control system of a power change station and the power change station, wherein the control method of the standby power control system comprises the following steps: when the power exchanging station works, the standby power control system initializes self-checking; waiting for a battery pack in the battery replacement station; continuously detecting whether the power grid is in a grid-connected state; when a power grid is in a grid-connected state, detecting the state of the battery pack, and electrifying or monitoring the battery pack according to the state of the battery pack; when the power grid is in an off-grid state, the state of the power battery is detected, and the electric quantity in the battery pack can be selectively used as a backup power supply in the power conversion station according to the state of the battery pack. Therefore, when the power swapping station is in an off-grid state, the electric quantity in the battery pack can be used as a backup power source of the power swapping station to maintain the operation of the power swapping station, and therefore the electric quantity in the battery pack is reasonably utilized. Meanwhile, the mode of taking the electric quantity in the battery pack as a back-up power supply is pollution-free and has strong loading capacity.
Description
Technical Field
The application relates to the technical field of power supply of power changing stations, in particular to a control method of a power supply control system of a power changing station and the power changing station.
Background
At present, the emission of automobile exhaust is still an important factor of the environmental pollution problem, and electric automobiles have been popularized in order to treat automobile exhaust. The current electric vehicles mainly comprise a direct charging type electric vehicle and a quick-changing type electric vehicle. The power battery of the electric automobile is quickly replaced through the battery replacement station.
In the related art, in the operation process of the battery replacement station, the battery replacement process is interrupted due to power interruption, and the risk that the battery pack is fully charged but has high-voltage electrification exists in the charging process in the battery replacement station by guiding the battery pack in a discharging mode through an energy recovery mode, so that the charging safety of the battery pack cannot be ensured. Moreover, under the condition of power interruption of a power grid, the power switching station cannot continue the power switching action, and the power switching process of the electric automobile is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control method of a standby power control system of a power conversion station, which can use the electric quantity in a battery pack as a standby power supply in the power conversion station when a power grid is in an off-grid state and has high safety.
The invention further provides a power swapping station.
The control method of the standby power control system of the power change station comprises the following steps: when the power exchanging station works, the standby power control system initializes self-checking; waiting for a battery pack in the battery replacement station; continuously detecting whether the power grid is in a grid-connected state or not; when a power grid is in a grid-connected state, detecting the state of the battery pack, and electrifying or monitoring the battery pack according to the state of the battery pack; when the power grid is in an off-grid state, the state of the power battery is detected, and the electric quantity in the battery pack can be selectively used as a backup power supply in the power conversion station according to the state of the battery pack.
According to the control method of the standby power control system provided by the embodiment of the invention, when the power exchange station is in an off-grid state, the electric quantity in the battery pack can be used as a standby power supply of the power exchange station to maintain the operation of the power exchange station, so that the electric quantity in the battery pack is reasonably utilized. Meanwhile, the mode of using the electric quantity in the battery pack as a back-up power supply has no pollution and strong loading capacity.
According to some embodiments of the invention, the detecting the state of the battery pack comprises: and judging whether the battery pack has a fault or not and whether the battery pack is in a working position or not, and when the battery pack does not have the fault and is positioned in the working position, electrifying the battery pack at low voltage by the battery management system.
According to some embodiments of the invention, after the battery pack is powered on at low voltage, whether the battery pack is matched with a battery replacement station is judged, and when the battery pack is matched, the national standard high voltage of the battery pack is powered on; and when the battery packs are not matched, switching to a state of waiting for the battery packs.
According to some embodiments of the invention, the step of determining whether the battery pack is matched with a battery swapping station comprises: judging whether the types of the battery packs are matched or not; judging whether the battery pack codes are matched or not; and when the battery pack and the battery pack meet the matching requirement at the same time, performing national standard high-voltage power-on the battery pack.
According to some embodiments of the invention, when the battery pack is in a national standard high-voltage power-on state, whether a standby power failure exists in the power conversion station is judged, and when the standby power failure exists in the power conversion station, the power conversion station is switched to a state of waiting for the battery pack; when the standby power failure does not exist in the power conversion station, the battery pack is in a charging starting success state.
According to some embodiments of the invention, when the battery pack is charged to a full-power state or the battery replacement station has a battery replacement requirement, the battery pack stops charging, and the battery management system performs low-voltage monitoring on the battery pack.
According to some embodiments of the invention, the battery management system monitoring the full-charge battery pack low voltage comprises: when at least one of a standby power fault, a battery replacement demand and a battery pack power shortage state exists in the battery replacement station, the battery management system is powered down at a low voltage, and when a power grid is in a grid-connected state, the battery management system is switched to a battery pack waiting state; when the charging fault exists in the battery replacement station, the battery replacement station is switched to a state of waiting for the battery pack.
According to some embodiments of the invention, when the power grid is in an off-grid state, whether a standby power failure exists in the power conversion station is judged, and when the standby power failure exists in the power conversion station, the battery pack is powered off at low voltage; when the standby power failure does not exist in the power conversion station, the grid-connected contactor is disconnected by adjusting the PCS control system, and the low-voltage electrification of the battery management system is controlled.
According to some embodiments of the invention, the battery management system low voltage power up step comprises: and the battery management system responds to delay or overtime connection and controls the battery pack to be powered down at low voltage.
According to some embodiments of the invention, the battery management system high voltage is controlled after the battery management system low voltage is powered up.
According to some embodiments of the present invention, a backup power connected load is selected by the PCS control system and powered by the backup power.
According to some embodiments of the invention, in the process of supplying power to the load in the power conversion station through the backup power supply, when at least one of the grid connection state of the power grid recovered from the off-grid state, the insufficient electric quantity of the battery pack and the standby power failure of the power conversion station is met, the standby power control system is controlled to be in the off-grid low-voltage monitoring state.
According to some embodiments of the invention, when the standby power control system is in an off-grid low-voltage monitoring state, the battery pack is controlled to be powered down at low voltage when at least one of a grid connection state, a standby power fault and a discharge fault of the power grid is recovered from the off-grid state is met.
According to some embodiments of the invention, when the battery pack is low-voltage and the power grid is recovered from an off-grid state to a grid-connected state, the battery pack is switched to a state of waiting for the battery pack; when the battery pack is powered down at a low voltage and the standby power failure exists in the power conversion station, the power conversion station is in a failure state.
According to some embodiments of the invention, when the power conversion station is in a fault state, the fault is cleared and the power grid is in a grid-connected state, the power conversion station is switched to a battery pack waiting state.
According to the computer-readable storage medium of an embodiment of the present invention, a control program of a power backup control system is stored thereon, and the control program, when executed by a processor, implements the control method of the power backup control system of the power swapping station as described above.
The power swapping station according to the embodiment of the invention comprises: the station controller is communicated with the cloud end controller; the standby power control system is communicated with the station end controller and executes the control method of the standby power control system; the system comprises a PCS control system and a battery management system, wherein the PCS control system and the battery management system can be respectively communicated with the standby power control system.
According to some embodiments of the invention, the PCS control system comprises: and the control switches are used for controlling the on-off of different loops in the PCS system so as to selectively use the electric quantity of the battery pack as a backup power supply in the battery replacement station.
According to some embodiments of the invention, further comprising: and the AC/DC inverter can use the electric quantity of the power battery as a backup power source in the power conversion station so as to supply power to a load in the power conversion station.
According to some embodiments of the invention, further comprising: the energy storage converter is a converter which flows with bidirectional energy of a power grid and a load.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a swapping station according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a PCS control system according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements can be directly connected with each other or indirectly connected with each other through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A control method of a standby power control system of a power swapping station according to an embodiment of the present invention is described below with reference to fig. 1.
The control method of the standby power control system comprises the following steps: when the power conversion station works, the standby power control system initializes self-checking, waits for a battery pack in the power conversion station, and continuously detects whether a power grid is in a grid-connected state.
When the power grid is in a grid-connected state, detecting the state of the battery pack, and electrifying the battery pack or monitoring the battery pack according to the state of the battery pack; when the power grid is in an off-grid state, the state of the power battery is detected, and the electric quantity in the battery pack can be selectively used as a backup power supply in the battery replacement station according to the state of the battery pack.
It can be understood that, when the power conversion station works, the standby power control system needs to perform self-checking, so that the standby power control system can work normally. The self-checking of the standby power control system comprises self-checking of components in the standby power control system, and can also comprise detection of a device which is communicated with the standby power control system, so that the working reliability of the power conversion station is ensured.
The term "waiting for replacement of a battery pack in a power station" refers to determining the position of the battery pack. Specifically, after the initialization self-check of the standby power control system is finished, the position of the battery pack needs to be judged to detect whether the battery pack is in an electrically connected state with a charging component in the power conversion station, the battery pack can be charged through the charging component only when the charging component is in a connected state with the battery pack, and the electric quantity in the battery pack can be used as a standby power supply of the power conversion station when the power grid is in an off-grid state.
Furthermore, the battery pack can be detected through various detection modes such as communication between the battery management system and the battery pack or detection of a station controller, so that subsequent operations (such as power-on, monitoring, power-off and the like) can be performed on the battery pack.
The power conversion station is connected with a power grid, and the power grid is used for supplying power to the power conversion station so as to meet the operation requirement of the power conversion station.
When the power grid is in a grid-connected state, the power grid can supply power to the power conversion station, and at the moment, a battery pack in the power conversion station can be electrified or monitored through the power grid. The battery pack in a low-power state can be charged, and the battery pack in a full-power state can be monitored.
It will be appreciated that in some special cases, such as: line faults, power failure maintenance in the area where the power change station is located and the like, and the power grid is in an off-grid state, namely the power grid cannot supply power to the power change station. At this time, the charging station may use the electric quantity in the battery pack as a backup power source of the charging station to maintain the operation of the charging station.
The mode of using the amount of electricity in the battery pack as a backup power source is more environmentally friendly than the mode of supplying power to a diesel engine.
According to the control method of the standby power control system provided by the embodiment of the invention, when the power exchange station is in an off-grid state, the electric quantity in the battery pack can be used as a standby power supply of the power exchange station to maintain the operation of the power exchange station, so that the electric quantity in the battery pack is reasonably utilized. Meanwhile, the mode of taking the electric quantity in the battery pack as a back-up power supply is pollution-free and has strong loading capacity.
In some embodiments of the invention, detecting the state of the battery pack comprises: and judging whether the battery pack has a fault or not and whether the battery pack is in a working position or not. When the battery pack has no fault and is located at the working position, the battery management system powers on the battery pack at low voltage. At this time, the grid may be in an off-grid state or in a grid-connected state.
It can be understood that when the battery pack has no fault, the power grid is in a grid-connected state, and the battery pack is located at a position where charging and discharging can be performed, the battery pack can be powered on at low voltage. The "working position" refers to a position where the battery pack can be charged and discharged in the battery replacement station.
In a further embodiment of the present invention, after the battery pack is powered on at a low voltage, it is determined whether the battery pack is matched with the battery replacement station. And when the battery pack is matched with the battery replacement station, the national standard high voltage of the battery pack is electrified so as to charge the battery pack. And when the battery pack is not matched with the battery replacement station, switching to a state of waiting for the battery pack.
Specifically, when the battery pack is matched with the battery replacement station, the battery pack can be charged through the battery replacement station; when the battery pack does not match the battery replacement station, the battery pack is not suitable for charging at the battery replacement station, and therefore the battery pack is adjusted to a waiting state. At this time, the battery pack may be confirmed again by the worker to be handled.
In some embodiments of the present invention, the step of determining whether the battery pack is matched with the battery swapping station includes: and judging whether the models of the battery packs are matched or not and whether the codes of the battery packs are matched or not. And when the battery pack and the battery pack meet the matching requirement at the same time, performing national standard high-voltage power-on the battery pack. And only when the battery pack and the power conversion station meet the matching requirement, the battery pack can be confirmed to be matched with the power conversion station, and the power conversion station can electrify the battery pack according to the national standard.
Further, the battery management system can detect the type of the battery pack, the code of the battery pack and other related information so as to detect whether the battery packs are matched.
In some embodiments of the invention, when the battery pack is in a national standard high-voltage power-on state, whether a standby power fault exists in the power conversion station is judged. When a standby power failure exists in the power conversion station, switching to a state of waiting for a battery pack; when the standby power failure does not exist in the power conversion station, the battery pack is in a charging starting success state.
It can be understood that the battery replacing station has the function of replacing the battery pack, and the replacement of the battery pack mainly comprises transferring the battery pack through a stacking machine, a battery transferring device and the like. "backup power failure" refers to the failure of components used for realizing the transportation of the battery pack in the power conversion station, such as: stacker crane faults, battery transfer device faults, sensor faults, and the like.
Further, "backup power failure" may also include: faults related to personal safety, such as: fire alarm failure, etc. It should be noted that different "backup power failures" exist in the hierarchy, such as: the faults of the stacker crane and the battery transfer device can be three-level faults, and the 'standby power faults' related to personal safety can be four-level faults. And measures made by the power change station are different aiming at different standby power faults.
When the standby power failure does not exist in the battery replacement station, the battery pack with the power shortage can be charged through the battery replacement station, and the battery pack is in a state of successful charging starting.
In a further embodiment of the present invention, when the battery pack is charged to a full-power state or the battery replacement station has a battery replacement requirement, the battery pack stops charging, and the battery management system performs low-voltage monitoring on the battery pack.
It can be understood that when the battery pack is charged to the full-charge state, the battery pack does not need to be continuously charged, so that the charging of the battery pack by the battery replacement station can be stopped, and the battery pack in the full-charge state is monitored by the battery management system.
Further, when the power station has the demand of replacing batteries, the battery pack that needs to be transported stops charging, and the device waiting for replacing the battery pack in the power station transports the battery pack, and in the waiting process, the battery pack that needs to be transported can be monitored through the battery management system, so that the reliability of replacing the battery pack in the power station is improved.
Optionally, when the battery is in a charging state, and the power grid is off-grid or a standby power failure occurs, the battery pack may also be monitored by the battery management system at low voltage.
In the process of monitoring the low voltage of the battery pack through the battery management system, when a charging fault occurs, the charging of the battery pack is stopped, and the battery pack is switched to a state of waiting for the battery pack. "charging failure" includes: failure of charging equipment and associated equipment, such as: charging motor failure, plug connector failure, etc.
In some embodiments of the present invention, the battery management system monitoring the low voltage of the fully charged battery pack comprises: when at least one of a standby power fault, a battery replacement demand and a battery pack power shortage state exists in the battery replacement station, the battery management system is powered down at a low voltage, and when a power grid is in a grid-connected state, the battery management system is switched to a battery pack waiting state.
When the problem of standby power failure exists in the battery replacement station, the battery replacement station cannot transfer the battery pack, and the battery management system does not need to monitor the battery pack, so that the low-voltage power-down of the battery management system is controlled, and the battery pack is adjusted to a state of waiting for the battery pack. Meanwhile, after the standby power failure is eliminated, the battery replacement station can execute actions such as battery pack charging and battery replacement again.
When the battery pack needs to be transported, the battery management system does not monitor the battery pack which is transported.
At the in-process of battery management system to full electric battery package low pressure control, trade the power station and do not charge to full electric battery package, when the battery package is in not charged state for a long time, its inside electric quantity can run off to the battery package can become insufficient voltage state by full electric state, and the battery package reaches the condition of restarting this moment, and then switches the battery package to waiting for the battery package state.
In the control method of the standby power control system in the embodiment of the invention, when the power grid is in an off-grid state, whether a standby power fault exists in the power conversion station is judged.
Specifically, when the standby power failure exists in the power conversion station, the battery pack is powered down at low voltage; when the standby power failure does not exist in the power conversion station, the grid-connected contactor is disconnected by adjusting the PCS control system, and the low-voltage electrification of the battery management system is controlled.
It can be understood that when the grid is switched from the grid-connected state to the off-grid state, the battery management system is in the power-off state, and when the operation of the power conversion station needs to be maintained, the battery management system needs to be activated again, that is, the battery management system is controlled to be powered on at a low voltage.
It should be noted that, when there is a standby power failure in the battery replacement station, the battery replacement station cannot perform a battery replacement operation, and at this time, the electric quantity in the battery pack is not used as a backup power source, and the battery replacement station may stop working.
When the power grid is in a grid-connected state, the battery replacing station can charge the battery pack and can execute a battery replacing action. Because the standby power system in the power conversion station continuously detects whether the power grid is in a grid-connected state, namely the power grid is likely to be switched from the grid-connected state to an off-grid state at any time. Such as: the method comprises the following steps that a battery management system monitors the low voltage of a battery pack, charges the battery pack according to the national standard, waits for the battery pack and the like. Therefore, when the power grid is switched from the grid-connected state to the off-grid state, the power conversion station is also switched from the grid-connected working state to the off-grid working state.
In some embodiments of the present invention, the standby power failure detection action is also an action performed continuously, that is, there is a possibility that a standby power failure occurs at any time, and the power conversion station may take corresponding measures according to its current operating state. Such as: when the battery pack is in a national standard charging state, a standby power failure in the battery replacement station is detected, the battery pack stops charging, and the battery pack is switched to a state of waiting for the battery pack.
In some embodiments of the invention, the battery management system low voltage power up step comprises: and when the response of the battery management system is delayed or the connection is overtime, the battery pack is controlled to be powered down at low voltage. It can be understood that when the response delay or connection timeout occurs in the battery management system, it indicates that the connection of the battery management system is failed at low voltage, and the power of the battery pack is not used as a backup power source of the power swapping station.
In some embodiments of the present invention, after the low-voltage power-on of the battery management system is successful, the high-voltage power-on of the battery management system is controlled, and the rechargeable battery management system is in an off-grid high-voltage power-on state.
In a further embodiment of the invention, a backup power connected load is selected and powered through the backup power by adjusting the PCS control system. It can be understood that after the battery management system is powered on at high voltage, the electric quantity in the battery pack can be used as a backup power source of the power conversion station.
The standby power control system can manage and control the PCS control system, and controls the PCS to charge the power battery when the power grid is in a grid-connected state; when the power grid is in an off-grid state, the standby power control system controls the PCS control system to invert so as to supply the electric energy of the battery pack to the power conversion station, and the electric energy is used as a standby power supply of the power conversion station to replace the operation of the power station in place.
Further, the PCS control system may select a supply target of electric energy of the battery pack, such as: devices for transporting the battery packs, and the like.
In some embodiments of the invention, in the process of supplying power to the load in the power conversion station through the backup power supply, when at least one of the grid connection state of the power grid is recovered from the off-grid state, the standby power failure of the power conversion station and the insufficient electric quantity of the battery pack is met, the standby power control system is controlled to be in the off-grid low-voltage monitoring state.
It can be understood that when the grid is recovered from the off-grid state to the grid-connected state, the electric quantity of the battery pack does not need to be used as a backup power supply, and therefore the backup power control system can be in the off-grid low-voltage monitoring state until the battery pack is powered off at low voltage, and waits for the power conversion station to be switched from the off-grid working state to the grid-connected working state again.
When the standby power failure exists in the power conversion station, the power conversion station cannot perform power conversion action, and therefore the standby power control system can be in an off-grid low-voltage monitoring state.
When the electric quantity of the battery pack is insufficient, the electric quantity of the battery pack is insufficient to maintain the operation of the battery replacement station, so that the standby power control system is adjusted to a low-voltage monitoring state.
In a further embodiment of the present invention, when the standby power control system is in an off-grid low voltage monitoring state. And when the condition that the grid is recovered from the off-grid state to at least one of the grid-connected state, the standby power fault and the discharging fault is met, controlling the battery pack to be powered down at low voltage. The step is a subsequent control step for adjusting the standby power control system to be in a low-voltage monitoring state.
It can be understood that, when the grid is recovered from the off-grid state to the grid-connected state, the standby power failure exists in the power conversion station, and the electric quantity of the battery pack is insufficient, the standby power control system is adjusted to the off-grid low-voltage monitoring state. After the standby power control system is adjusted to the off-grid low-voltage monitoring state, when the power grid recovers the grid-connected state and the power conversion station has standby power failure and discharge failure, the battery pack can be controlled to be powered down at low voltage, and at the moment, the electric quantity in the battery pack is no longer used as a standby power supply.
In some embodiments of the invention, when the battery pack is powered down at low voltage and the grid is recovered from the off-grid state to the grid-connected state, the battery pack is switched to a state of waiting for the battery pack; when the battery pack is powered off at low voltage and the standby power failure exists in the power switching station, the power switching station is in a failure state.
Specifically, when the power grid is switched from the off-grid state to the on-grid state, the PCS control system is required to control the on-grid contactor to be closed so as to switch the off-grid working state of the battery replacement station to the on-grid working state, at this time, the working process of the battery replacement station can be switched to a state of waiting for a battery pack, and the battery replacement station recovers the on-grid working state.
When the battery pack is powered down at a low voltage, a standby power failure exists in the power conversion station, and the power conversion station is in a state of being incapable of working, so that the power conversion station is in a failure state. When the power swapping station is in a fault state, the power swapping station does not work.
In a further embodiment of the invention, when the power conversion station is in a fault state, the fault is cleared and the power grid is in a grid-connected state, the power conversion station is switched to a battery pack waiting state. It can be understood that when the power conversion station is in a fault state, the fault in the power conversion station needs to be cleared so as to meet basic conditions of operation of the power conversion station, and meanwhile, when the power grid is in a grid-connected state, the power conversion station can recover the grid-connected working state.
According to the control method of the standby power controller provided by the embodiment of the invention, the power conversion station is in a normal non-fault state (a power grid is in a grid-connected state), and the control system in the power conversion station is communicated with the charging module and the battery management system to acquire the equipment state, so that the battery pack is guided to enter a high-voltage power-on state, and the battery pack enters a national standard charging state after being successfully powered on at high voltage. The process is stopped when the power grid is off the grid, the battery replacing demand exists in the battery replacing station, the battery pack is fully charged and the like, and then the battery pack is monitored in a low-voltage mode through the battery management system. And if the power grid is disconnected during the period, the power conversion station enters the off-grid working state.
Further, when the power conversion station is in a fault-free state, after the power conversion station enters an off-grid working state, high-voltage discharge can be carried out through the battery pack, and the electric quantity of the battery pack is used as a backup power supply of the power conversion station to be practical, so that the operation of the power conversion station is maintained until the backup power controller enters a low-voltage monitoring state. During the period, when the discharging fault and the standby power fault exist in the power conversion station, the grid connection is recovered, and the like, the power supply of the battery pack is stopped.
Further, when the power conversion station judges that the power of the power grid is recovered, the working state of the power grid is switched from the off-grid working state to the on-grid working state, and the power supply of the power conversion station is supplied by the power grid.
It should be noted that, referring to fig. 2, the control method for the backup power control system according to the present application is not limited thereto, and the backup power control system may detect the states (grid connection and grid disconnection) of the power grid in real time, and reasonably switch the grid connection working state and the grid disconnection working state of the power conversion station according to the actual application requirements.
According to the computer readable storage medium of the embodiment of the invention, the control program of the standby power control system is stored, and the control program is executed by the processor to realize the control method of the standby power control system of the power change station. By the control method, when the power grid is in an off-grid state, the backup power control system controls the PCS control system to invert so as to use the electric quantity in the battery pack as a backup power supply of the power conversion station, and the operation of the power conversion station is maintained.
According to the power swapping station of the embodiment of the invention, the power swapping station comprises: the system comprises a station end controller and a standby power control system, wherein the station end controller is communicated with a cloud end controller; and the standby power control system is communicated with the station end controller and executes the control method of the standby power control system. Therefore, the standby power control system can use the electric quantity in the battery pack as a standby power supply of the power switching station to maintain the operation of the power switching station.
Further, trade power station still includes: PCS control system and battery management system, PCS control system and battery management system can be used for the communication of the standby power control system.
It should be noted that the backup power control system can manage and control the PCS control system and the battery management system, and the backup power control system can respectively and independently manage the PCS control system and the battery pack, and the backup power control system can operate and can be controlled by the station-side controller in a unified manner.
Specifically, when the power grid normally supplies power, the standby power control system controls the PCS control system to charge the battery pack until the battery pack is charged to a full power state or the battery replacement station has a requirement for replacing the battery pack or a fault exists in the battery replacement station, and the standby power control system can enter a monitoring state.
When the power grid is in an off-grid state, the standby power control system can control the PCS control system to invert so that the electric quantity in the battery pack is used as a standby power supply of the power conversion station to output energy to the power conversion station for the power conversion station to use, and the operation of the power conversion station is maintained.
As shown in fig. 3, the PCS control system includes: and the control switches are used for controlling the on-off of different loops in the PCS system so as to selectively use the electric quantity of the battery pack as a backup power supply in the battery replacement station.
In some embodiments of the invention, the PCS control system further comprises: and the AC/DC inverter can use the electric quantity of the power battery as a backup power supply in the power conversion station so as to supply power to a load in the power conversion station. When the power conversion station loses power supply from the power grid, the AC/DC inverter is controlled to be switched to the independent inversion mode, and the corresponding switches are switched off to realize differential power supply, so that the electric quantity of the battery pack can be output to the load.
In some optional embodiments of the invention, the PCS control system further comprises: the energy storage converter is a converter which can flow energy in two directions with a power grid and a load. It will be appreciated that when the grid is normally supplying power, the battery pack may be charged by the charging module and the energy storage converter, and the load power in the station is supplied by the grid. When the power grid loses power and still needs to work continuously, the energy storage converter is controlled to be switched to an independent inversion mode, and corresponding switches are disconnected so as to realize differential power supply.
It should be noted that "differential power supply" refers to outputting the electric quantity of the battery pack to different loads by adjusting the on and off of the control switch, so as to meet the working requirements of different loads, thereby improving the emergency treatment capability of the power switching station, and still meeting the operation requirements of the power switching station for the working state of power grid power loss.
Referring to fig. 3, the PCS control system includes a plurality of control switches. Specifically, when S1 is closed, the power conversion station is in a normal power supply state of the power grid, wherein one or more of S2, S3, and S4 may be selectively closed according to different work requirements, such as: when S2 is closed, the power grid may supply power to the power battery.
When S1 is turned off, the battery pack is used as a power source to supply power to different loads by controlling the PCS or the AD/DC inverter. Further, when S2 is closed, the battery pack may supply power to the first type of load; when S2, S3 are closed, the battery pack may simultaneously power the first type of load and the third type of load; when S4 is closed, the battery pack may supply power to a third type of load; when S2, S4 are open, the battery pack may only power the second type of load.
It should be noted that the first type of load, the second type of load, and the third type of load do not represent a single component, and are classified according to the level of demand for the backup power source. Such as: the first type of load can be a load with low use demand of a backup power supply by a lighting lamp; the second type of load can be a load with high use requirement on a backup power supply, such as a battery transfer device; the third type of load may be a load with a higher demand for the use of a backup power source, such as a high-power motor.
In some embodiments of the invention, the PCS control system further comprises: a UPS (Uninterruptible Power System/Uninterruptible Power Supply) Power source, i.e., an Uninterruptible Power Supply. When the power grid loses power, the controller in the power conversion station can use the UPS as a backup power supply to ensure the work of a control system in the power conversion station.
In some embodiments of the present invention, the power swapping station further comprises: and when the battery pack in the battery replacement station cannot be used as a backup power supply to provide electric energy, the diesel generator can be used for generating electricity. Compared with diesel engine power generation, the mode of using the electric quantity of the battery pack of the power conversion station as a backup power supply is more environment-friendly.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (13)
1. A control method of a standby power control system of a power conversion station is characterized by comprising the following steps:
when the power exchanging station works, the standby power control system initializes self-checking;
waiting for a battery pack in the battery replacement station;
continuously detecting whether the power grid is in a grid-connected state;
when the power grid is in a grid-connected state, detecting the state of the battery pack, judging whether the battery pack has a fault or not and whether the battery pack is in a working position or not, and electrifying or monitoring the low voltage of the battery pack according to the state of the battery pack when the battery pack does not have the fault and is in the working position;
when the power grid is in an off-grid state, detecting the state of the power battery, and selectively taking the electric quantity in the battery pack as a backup power supply in a power changing station according to the state of the battery pack;
when the power grid is in an off-grid state, whether a standby power failure exists in the power conversion station is also judged;
when the standby power failure does not exist in the power conversion station, the grid-connected contactor is disconnected by adjusting the PCS control system, the low-voltage electrification of the battery management system is controlled, and the high-voltage electrification of the battery management system is controlled after the low-voltage electrification of the battery management system; selecting a load connected with a backup power supply by adjusting the PCS control system, and supplying power to the load through the backup power supply;
in the process of supplying power to a load in a power conversion station through a backup power supply, when at least one of a grid connection state of a power grid recovered from an off-grid state, insufficient electric quantity of a battery pack and a standby power failure of the power conversion station is met, controlling a standby power control system to be in an off-grid low-voltage monitoring state;
when the standby power control system is in an off-grid low-voltage monitoring state, the battery pack is controlled to be powered down under low voltage when at least one of a grid connection state, a standby power fault and a discharge fault of the power grid is recovered from the off-grid state is met.
2. The control method of the power standby control system of the power swapping station as claimed in claim 1, wherein after the battery pack is powered on at a low voltage, whether the battery pack is matched with the power swapping station is judged,
when the battery packs are matched, electrifying the national standard high voltage of the battery packs;
when the battery packs are not matched, the state of waiting for the battery packs is switched.
3. The control method of the power standby control system of the power swapping station as claimed in claim 2, wherein the step of determining whether the battery pack is matched with the power swapping station comprises:
judging whether the types of the battery packs are matched or not;
judging whether the battery pack codes are matched or not;
and when the battery pack and the battery pack meet the matching requirement at the same time, performing national standard high-voltage power-on the battery pack.
4. The control method of the power supply control system of the power switching station as claimed in claim 2, wherein when the battery pack is in a state of being powered on at a high voltage according to a national standard, whether a power supply fault exists in the power switching station is determined,
when a standby power failure exists in the power conversion station, switching to a state of waiting for a battery pack;
when the standby power failure does not exist in the power conversion station, the battery pack is in a charging starting success state.
5. The control method of the power standby control system of the power swapping station as claimed in claim 4, wherein when the battery pack is charged to a full power state or the power swapping station has a power swapping requirement, the battery pack stops being charged, and the battery management system monitors the battery pack at a low voltage.
6. The control method of the power backup control system of the power swapping station as claimed in claim 5, wherein the monitoring of the full-charge battery pack low voltage by the battery management system comprises:
when at least one of a standby power fault, a battery replacement demand and a battery pack power shortage state exists in the battery replacement station, the battery management system is powered down at a low voltage, and when a power grid is in a grid-connected state, the battery management system is switched to a battery pack waiting state;
and when the charging fault exists in the battery replacement station, switching to a state of waiting for the battery pack.
7. The control method of the standby power control system of the power change station according to claim 1,
when the battery pack is pressed down at a low voltage and the grid connection state of the power grid is recovered from the off-grid state, switching to a state of waiting for the battery pack;
when the battery pack is powered down at a low voltage and the standby power failure exists in the power conversion station, the power conversion station is in a failure state.
8. The control method of the standby power control system of the power conversion station according to claim 7, characterized in that when the power conversion station is in a fault state, the fault is cleared and the power grid is in a grid-connected state, the power conversion station is switched to a battery pack waiting state.
9. A computer-readable storage medium, on which a control program of a power backup control system is stored, the control program, when executed by a processor, implementing a control method of the power backup control system of a power swapping station according to any one of claims 1 to 8.
10. A power swapping station, comprising:
the station-end controller is communicated with the cloud-end controller;
a power backup control system that communicates with the station-side controller and that performs the control method of the power backup control system according to any one of claims 1 to 8;
the system comprises a PCS control system and a battery management system, wherein the PCS control system and the battery management system can be respectively communicated with the standby power control system.
11. The swapping station of claim 10, wherein the PCS control system comprises:
and the control switches are used for controlling the on-off of different loops in the PCS system so as to selectively use the electric quantity of the battery pack as a backup power supply in the battery replacement station.
12. The swapping station of claim 10, further comprising: and the AC/DC inverter can use the electric quantity of the power battery as a backup power supply in the power conversion station so as to supply power to a load in the power conversion station.
13. The swapping station of claim 10, further comprising: the energy storage converter is a converter which can flow energy in two directions with a power grid and a load.
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| CN114537204A (en) * | 2022-02-28 | 2022-05-27 | 蔚来汽车科技(安徽)有限公司 | Control device and method for power swapping station |
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| CN103414202B (en) * | 2013-07-18 | 2016-04-27 | 南方电网科学研究院有限责任公司 | The management method of the management system of the electric automobile battery replacing station in a kind of microgrid |
| CN103730952A (en) * | 2014-01-26 | 2014-04-16 | 国家电网公司 | Emergency power supply device and method for electric vehicle swapping station |
| CN106130171A (en) * | 2016-07-21 | 2016-11-16 | 蔚来汽车有限公司 | Light fills storage and changes one station and distribution method thereof |
| CN206135505U (en) * | 2016-11-07 | 2017-04-26 | 三峡大学 | Little electric wire netting suitable for electric automobile difference demand of charging |
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