CN110829584B - Uninterrupted power source dynamic power distribution system based on battery state - Google Patents
Uninterrupted power source dynamic power distribution system based on battery state Download PDFInfo
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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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- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The invention discloses a dynamic power distribution system of an uninterruptible power supply based on a battery state, wherein the system comprises: the system comprises an uninterruptible power supply, a three-phase commercial power, a central controller, a two-phase output end, a bus and a high-power load; the uninterruptible power supply is connected with the three-phase commercial power based on three-phase lines, and is connected with the two-phase output end based on two-phase lines; the uninterruptible power supply is connected with the bus based on the bus interface; the two-phase output end is connected with the high-power load; the central controller is connected with the bus. In the embodiment of the invention, the output power instruction applied to each power supply unit can be dynamically adjusted according to the state of the uninterrupted power supply, so that the rapid aging of power-shortage and high-temperature power supply units is avoided, the service life of the system is prolonged, and the maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of uninterruptible power supplies, in particular to an uninterruptible power supply dynamic power distribution system based on a battery state.
Background
A medium-and-small-Power Uninterruptible Power Supply (UPS) often supplies Power to important instruments and equipment in a parallel networking manner, so as to ensure that the instruments and equipment always operate normally when a mains Supply is powered off or a single UPS fails.
When the commercial power is disconnected, each power supply node is provided with electric energy by the battery pack equipped with the power supply node. However, the capacity, the service life, the quality, the working environment and other factors of each unit device are often difficult to unify, and the most different and most influential factors are the battery performance and the state. After a period of device use, the battery status of each device in the microgrid may vary widely. Based on the traditional power sharing strategy, all uninterruptible power supplies in the microgrid have the same output power requirement, and therefore power supply units with poor states are necessarily aged quickly. This increases the operation and maintenance costs of the microgrid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a dynamic power distribution system of an uninterruptible power supply based on a battery state, which can dynamically adjust output power instructions applied to each power supply unit according to the state of the uninterruptible power supply, avoid the rapid aging of power-shortage and high-temperature power supply units, prolong the service life of the system and reduce the maintenance cost.
In order to solve the above problems, the present invention provides a dynamic power distribution system for an uninterruptible power supply based on a battery state, the system comprising: the system comprises an uninterruptible power supply, a three-phase commercial power, a central controller, a two-phase output end, a bus and a high-power load; the uninterruptible power supply is connected with the three-phase commercial power based on three-phase lines, and is connected with the two-phase output end based on two-phase lines; the uninterruptible power supply is connected with the bus based on the bus interface; the two-phase output end is connected with the high-power load; the central controller is connected with the bus.
Optionally, the number of the uninterruptible power supplies is at least 2, and the uninterruptible power supplies are connected to the three-phase mains supply, the bus, and the two-phase output terminal in parallel.
Optionally, the uninterruptible power supply includes: the device comprises a rectifier, a storage battery, an inverter, a filter inductor, a filter capacitor and a unit controller; wherein,
the input end of the inverter is connected with the output end of the rectifier based on two phase lines, and the output end of the inverter is connected with the filter inductor based on a single phase line; the storage battery is arranged on a two-phase line between the rectifier and the inverter; one end of the filter inductor is connected with the inverter based on a single-phase line; the other end of the two-phase output terminal is connected to one phase of the two-phase output terminal based on a single-phase line; one end of the filter capacitor is connected to the output end of the filter inductor, and the other end of the filter capacitor is grounded and connected to the other phase of the two-phase output end; the input end of the rectifier is connected to the three-phase commercial power based on three-phase lines; the unit controller is respectively connected with the inverter and the connection point between the filter inductor and the filter capacitor.
Optionally, the uninterruptible power supply further includes: an inductive current sensor and an output current sensor; wherein,
the inductive current sensor is arranged on a single-phase line between the inverter and the filter inductor and is connected with the unit controller; the output current sensor is arranged on the output end of the filter inductor and connected with the bus interface.
Optionally, the power output requirement of the ups is allocated according to the state of the storage battery of each ups in the ups dynamic power allocation system, and the specific allocation is as follows:
for the situation that n uninterrupted power supplies exist in the uninterrupted power supply dynamic power distribution system, the number of the uninterrupted power supplies is
Wherein f isi(SOCi,Ti) Representing an evaluation factor based on the battery state of the power supply unit; i.e. iloadRepresents the total load current of the high power load; SOC represents the charge of the battery; t represents the temperature of the storage battery; n is a positive integer of 1 or more.
Optionally, the unit controller is configured to perform closed-loop control on the output according to an output power instruction distributed by the central controller, a feedback output voltage in the uninterruptible power supply, and a current of the inductive current sensor; wherein, the distribution outer loop that constitutes by electric current, inductive current sensor current and power frequency voltage in the power distribution instruction through virtual impedance calculation offset voltage to and inner loop command voltage, existing:
an active damping inner ring is formed by inner ring command voltage, inductive current sensor current and feedback output voltage, and the output voltage of the inverter is calculated through a proportional-integral controller H, so that the method has the following steps:
wherein i* 1Representing the current in the power distribution command; v. of* o1Represents an inner loop command voltage; v. of50HzRepresenting the power frequency voltage; Δ v represents the compensation voltage calculated by the virtual impedance; zvRepresenting a virtual impedance; i.e. iL1Representing an inductor current sensor current; v. ofo1Representing a feedback output voltage; v. of* invRepresenting an inverter output voltage; h represents a proportional integral controller functionAnd K represents a constant coefficient.
Optionally, the rectifier is a diode rectifier.
Optionally, the system further comprises a load current sensor; the load current sensor is arranged between the two-phase output end and the high-power load and is connected with the central controller.
In the embodiment of the invention, the output power instruction applied to each power supply unit can be dynamically adjusted according to the state of the uninterrupted power supply, so that the rapid aging of power-shortage and high-temperature power supply units is avoided, the service life of the system is prolonged, and the maintenance cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a battery status-based dynamic power distribution system for an uninterruptible power supply according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a current command execution strategy in an ups unit controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
An uninterruptible power supply dynamic power distribution system based on battery status, the system comprising: the system comprises an uninterruptible power supply, a three-phase commercial power, a central controller, a two-phase output end, a bus and a high-power load; the uninterruptible power supply is connected with the three-phase commercial power based on three-phase lines, and is connected with the two-phase output end based on two-phase lines; the uninterruptible power supply is connected with the bus based on the bus interface; the two-phase output end is connected with the high-power load; the central controller is connected with the bus.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dynamic power distribution system of an ups based on battery status according to an embodiment of the present invention.
As shown in fig. 1, a battery state based dynamic power distribution system for an uninterruptible power supply, the system comprising: the system comprises an uninterruptible power supply 1, a three-phase commercial power 2, a central controller 3, a two-phase output end 4, a bus 5 and a high-power load 6; the uninterruptible power supply 1 is connected with the three-phase commercial power 2 based on three-phase lines, and is connected with the two-phase output end 4 based on two-phase lines; the uninterrupted power supply 1 is connected with a bus 5 based on a bus interface 19; the two-phase output end 4 is connected with the high-power load 6; the central controller 3 is connected to the bus 5.
In the specific implementation process of the present invention, the number of the uninterruptible power supplies 1 is at least 2, and the uninterruptible power supplies are respectively connected to the three-phase utility power 2, the bus 5, and the two-phase output terminal 4 in parallel.
Specifically, the plurality of uninterruptible power supplies 1 are connected in parallel to supply power, so that even when one or more of the plurality of uninterruptible power supplies 1 (compared with the number of uninterruptible power supplies 1 connected in parallel) have faults, the high-power load 6 cannot be powered off.
In a specific implementation process of the present invention, the uninterruptible power supply 1 includes: the device comprises a rectifier 11, a storage battery 12, an inverter 13, a filter inductor 14, a filter capacitor 15 and a unit controller 18; the input end of the inverter 13 is connected with the output end of the rectifier 11 based on two phase lines, and the output end is connected with the filter inductor 14 based on a single phase line; the battery 12 is disposed on the two-phase line between the rectifier 11 and the inverter 13; one end of the filter inductor 14 is connected with the inverter 13 based on a single-phase line; the other end is connected to one phase of the two-phase output end 4 based on a single phase line; one end of the filter capacitor 15 is connected to the output end of the filter inductor 14, and the other end of the filter capacitor is grounded and connected to the other phase of the two-phase output end 4; the input end of the rectifier 11 is connected to the three-phase mains supply 2 based on three-phase lines; the unit controller 18 is connected to the inverter 13 and a connection point between the filter inductor 14 and the filter capacitor 15, respectively.
In a specific implementation process of the present invention, the uninterruptible power supply 1 further includes: an inductive current sensor 16 and an output current sensor 17; wherein the inductor current sensor 16 is disposed on a single-phase line between the inverter 13 and the filter inductor 14, and the inductor current sensor 16 is connected to the unit controller 18; the output current sensor 17 is arranged at the output end of the filter inductor 14, and the output current sensor 17 is connected with the bus interface 19.
In the specific implementation process of the present invention, the power output requirement of the ups 1 is allocated according to the state of the storage battery 12 of each ups 1 in the ups dynamic power allocation system, and the specific allocation is as follows:
for the situation that n uninterruptible power supplies 1 exist in the dynamic power distribution system of the uninterruptible power supplies, the dynamic power distribution system of the uninterruptible power supplies has
Wherein f isi(SOCi,Ti) Representing an evaluation factor based on the battery state of the power supply unit; i.e. iloadRepresents the total load current of the high power load; SOC represents the charge of the battery; t represents the temperature of the storage battery; n is a positive integer of 1 or more.
Specifically, each ups 1 in the operation of the ups dynamic power distribution system sends the battery state of its own battery 12 to the central controller 3 in real time, and the central controller calculates the output power requirement of each ups 1 in real time according to the total load current of the high-power load and the electric quantity SOC and temperature T of the battery 12 of each ups, as follows:
for the situation that n uninterrupted power supplies exist in the uninterrupted power supply dynamic power distribution system, the number of the uninterrupted power supplies is
Wherein f isi(SOCi,Ti) Representing an evaluation factor based on the battery state of the power supply unit; i.e. iloadRepresents the total load current of the high power load; SOC represents the charge of the battery; t represents the temperature of the storage battery; n is a positive integer of 1 or more.
fi(SOCi,Ti) The function structure of (2) can be set according to requirements, and is not unique, for example:
it can be seen that the higher the electric quantity of the storage battery 12 is, the higher the output power command is, and otherwise, the lower the output power command is; the higher the temperature of the battery 12, the lower the output power command, and vice versa.
In the specific implementation process of the invention, the unit controller is used for carrying out closed-loop control on the output according to the output power instruction distributed by the central controller, the feedback output voltage in the uninterrupted power supply and the current of the inductive current sensor; wherein, the distribution outer loop that constitutes by electric current, inductive current sensor current and power frequency voltage in the power distribution instruction through virtual impedance calculation offset voltage to and inner loop command voltage, existing:
an active damping inner ring is formed by inner ring command voltage, inductive current sensor current and feedback output voltage, and the output voltage of the inverter is calculated through a proportional-integral controller H, so that the method has the following steps:
wherein i* 1Representing the current in the power distribution command; v. of* o1Represents an inner loop command voltage; v. of50HzRepresenting the power frequency voltage; Δ v represents the compensation voltage calculated by the virtual impedance; zvRepresenting a virtual impedance; i.e. iL1Representing an inductor current sensor current; v. ofo1Representing a feedback output voltage; v. of* invRepresenting an inverter output voltage; h denotes a proportional integral controller function and K denotes a constant coefficient.
In the implementation of the present invention, the rectifier 11 is a diode rectifier.
In the implementation of the present invention, the system further includes a load current sensor 21; the load current sensor 21 is arranged between the two-phase output end 4 and the high-power load 6 and is connected with the central controller 3; the load current sensor 21 is used to measure the load current of the high power load 6 and output the load current to the central controller 3.
Specifically, during operation, each parallel uninterruptible power supply 1 sends the respective battery state to the central controller 3 in real time, the battery state is sent through the bus 4, the load current of the high-power load 6 of the mobile phone of the central controller 3 and the battery electric quantity SOC of each parallel uninterruptible power supply 1iAnd temperature TiThe output power requirement of each parallel uninterruptible power supply 1 is calculated in real time, and the output power instruction is dynamically adjusted according to the actual battery state change of each parallel uninterruptible power supply 1. The output power of each parallel uninterrupted power supply 1 can be controlled, and the higher the specific battery electric quantity is, the higher the output power instruction is, and otherwise, the lower the output power instruction is; electric powerThe higher the pool temperature, the lower the output power command and vice versa.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a current command execution strategy in an ups unit controller according to an embodiment of the present invention.
The unit controller 18 is used for carrying out closed-loop control on output according to an output power instruction distributed by the central controller, feedback output voltage in the uninterrupted power supply and current of the inductive current sensor; wherein, the distribution outer loop that constitutes by electric current, inductive current sensor current and power frequency voltage in the power distribution instruction through virtual impedance calculation offset voltage to and inner loop command voltage, existing:
an active damping inner ring is formed by inner ring command voltage, inductive current sensor current and feedback output voltage, and the output voltage of the inverter is calculated through a proportional-integral controller H, so that the method has the following steps:
wherein i* 1Representing the current in the power distribution command; v. of* o1Represents an inner loop command voltage; v. of50HzRepresenting the power frequency voltage; Δ v represents the compensation voltage calculated by the virtual impedance; zvRepresenting a virtual impedance; i.e. iL1Representing an inductor current sensor current; v. ofo1Representing a feedback output voltage; v. of* invRepresenting an inverter output voltage; h denotes a proportional integral controller function and K denotes a constant coefficient.
In the embodiment of the invention, the output power instruction applied to each power supply unit can be dynamically adjusted according to the state of the uninterrupted power supply, so that the rapid aging of power-shortage and high-temperature power supply units is avoided, the service life of the system is prolonged, and the maintenance cost is reduced.
The above detailed description is provided for the dynamic power distribution system of the ups based on the battery status according to the embodiment of the present invention, and the principle and the implementation manner of the present invention are explained by using a specific example, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (5)
1. An uninterruptible power supply dynamic power distribution system based on battery status, the system comprising: the system comprises an uninterruptible power supply, a three-phase commercial power, a central controller, a two-phase output end, a bus and a high-power load; the uninterruptible power supply is connected with the three-phase commercial power based on three-phase lines, and is connected with the two-phase output end based on two-phase lines; the uninterruptible power supply is connected with the bus based on the bus interface; the two-phase output end is connected with the high-power load; the central controller is connected with the bus;
the uninterruptible power supply includes: the device comprises a rectifier, a storage battery, an inverter, a filter inductor, a filter capacitor and a unit controller; wherein,
the input end of the inverter is connected with the output end of the rectifier based on two phase lines, and the output end of the inverter is connected with the filter inductor based on a single phase line; the storage battery is arranged on a two-phase line between the rectifier and the inverter; one end of the filter inductor is connected with the inverter based on a single-phase line; the other end of the two-phase output terminal is connected to one phase of the two-phase output terminal based on a single-phase line; one end of the filter capacitor is connected to the output end of the filter inductor, and the other end of the filter capacitor is grounded and connected to the other phase of the two-phase output end; the input end of the rectifier is connected to the three-phase commercial power based on three-phase lines; the unit controller is respectively connected with the inverter and a connection point between the filter inductor and the filter capacitor;
the uninterruptible power supply further includes: an inductive current sensor and an output current sensor; wherein,
the inductive current sensor is arranged on a single-phase line between the inverter and the filter inductor and is connected with the unit controller; the output current sensor is arranged on the output end of the filter inductor and is connected with the bus interface;
the power output requirement of the uninterruptible power supply is distributed according to the state of the storage battery of each uninterruptible power supply in the dynamic power distribution system of the uninterruptible power supply, and the specific distribution is as follows:
for the situation that n uninterrupted power supplies exist in the uninterrupted power supply dynamic power distribution system, the number of the uninterrupted power supplies is
Wherein f isi(SOCi,Ti) Representing an evaluation factor based on the battery state of the power supply unit; i.e. iloadRepresents the total load current of the high power load; SOC represents the charge of the battery; t represents the temperature of the storage battery; n is a positive integer of 1 or more.
2. The dynamic uninterruptible power supply power distribution system of claim 1, wherein the number of uninterruptible power supplies is at least 2, and the uninterruptible power supplies are connected in parallel to the three-phase utility power, the bus, and the two-phase output, respectively.
3. The dynamic uninterruptible power supply power distribution system of claim 1, wherein the unit controller is configured to perform closed-loop control on the output according to the output power command distributed by the central controller and the feedback output voltage and the inductor current sensor current in the uninterruptible power supply; wherein, the distribution outer loop that constitutes by electric current, inductive current sensor current and power frequency voltage in the power distribution instruction through virtual impedance calculation offset voltage to and inner loop command voltage, existing:
an active damping inner ring is formed by inner ring command voltage, inductive current sensor current and feedback output voltage, and the output voltage of the inverter is calculated through a proportional-integral controller H, so that the method has the following steps:
wherein,
representing the current in the power distribution command;
represents an inner loop command voltage; v. of50HzRepresenting the power frequency voltage; Δ v represents the compensation voltage calculated by the virtual impedance; zvRepresenting a virtual impedance; i.e. iL1Representing an inductor current sensor current; v. ofo1Representing a feedback output voltage;
representing an inverter output voltage; h denotes a proportional integral controller function and K denotes a constant coefficient.
4. The ups dynamic power distribution system of claim 1, wherein the rectifier is a diode rectifier.
5. The uninterruptible power supply dynamic power distribution system of claim 1, further comprising a load current sensor; the load current sensor is arranged between the two-phase output end and the high-power load and is connected with the central controller.
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