CN114784785A - Energy storage and high-voltage direct-current coupling power supply and control system for data center - Google Patents

Energy storage and high-voltage direct-current coupling power supply and control system for data center Download PDF

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Publication number
CN114784785A
CN114784785A CN202210409523.6A CN202210409523A CN114784785A CN 114784785 A CN114784785 A CN 114784785A CN 202210409523 A CN202210409523 A CN 202210409523A CN 114784785 A CN114784785 A CN 114784785A
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China
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energy storage
storage battery
voltage
direct current
power
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朱华
李典林
张川燕
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Everything Xinneng Shenzhen Technology Co ltd
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Everything Xinneng Shenzhen Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • 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
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • 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

Abstract

The invention provides an energy storage and high-voltage direct-current coupling power supply and control system for a data center, which comprises an energy management system, an alternating-current input power distribution system, high-voltage direct-current equipment, a backup storage battery and a battery management system thereof, a column head cabinet (containing a multifunctional electric measuring instrument) for load power distribution and an energy storage system; the energy storage and high-voltage direct-current coupling power supply architecture and control disclosed by the invention not only solve the problem of uninterrupted power supply of a data center load, but also fully utilize an energy storage system to carry out peak-valley arbitrage, demand side response, frequency modulation and peak regulation and the like.

Description

Energy storage and high-voltage direct-current coupling power supply and control system for data center
Technical Field
The invention relates to an energy storage and high-voltage direct-current coupling power supply and control system for a data center.
Background
A large amount of intermittent new energy such as photovoltaic power generation, wind power generation and the like is connected into a power grid, and great challenges are brought to the safety and the stability of the power grid. The stored energy plays a key role in ensuring the power supply safety of a power grid, adjusting frequency and peak, absorbing new energy and the like, and the energy storage construction of a user side can be increased on a large scale. At present, in order to solve the safety problem of energy storage at a user side, the energy storage construction form at the user side generally adopts container outdoor arrangement, and low-voltage alternating current or high-voltage alternating current is used for grid-connected operation at a power distribution system at the user side through a PCS. As shown in fig. 1 and fig. 2 below, schematic diagrams of the user-side energy storage system operating in a high-voltage and low-voltage ac grid-connected mode are shown. The energy storage converter, power conversion system, abbreviated as PCS, is a device for connecting a battery system and a power grid (and/or load) to realize bidirectional power conversion, and the default is generally alternating current to direct current conversion.
The energy storage system form at the user side does not consider special user conditions such as a data center which mainly use direct current and have high power supply safety requirements. The data center is used as a scene of a user side, is used for installing and operating electronic information equipment, the electric load of the data center mainly comprises the electronic information equipment such as a server and a switch, the finally used electricity of the data center mainly comprises direct current, meanwhile, the reliability and the safety of power supply of the data center have high requirements, and generally, an uninterrupted power supply or high-voltage direct-current equipment is required to be adopted in a power supply framework of the data center, so that the continuous and stable power supply can be ensured after the power failure of a mains supply. Particularly, with the increasing demand for energy saving in recent years, high voltage direct current has become more and more widely applied to data centers due to its low loss. The high voltage direct current equipment used in the data center is the conversion of alternating current and direct current. The energy storage battery in the energy storage system is also direct current, and the PCS in the energy storage system is also bidirectional conversion of alternating current and direct current. The application of the energy storage system can well solve the problems of green energy consumption, peak clipping and valley filling, demand side response, frequency modulation and peak regulation and the like. If couple energy storage and HVDC system, solve data center's power supply guarantee problem, realize the support to novel electric power system simultaneously. . However, to realize the coupling of the energy storage system and the data center high-voltage direct-current system, more problems need to be solved, the energy storage system and the high-voltage direct-current device need to be deconstructed and recombined, and a new control system is provided according to the application scenario of the data center.
Disclosure of Invention
The purpose of the invention is as follows: the high-voltage direct-current equipment of the data center is coupled with the energy storage system, so that the application problem of the energy storage system, the functions of energy storage peak clipping and valley filling, demand side response, new energy consumption, frequency modulation and peak regulation and the like are solved, meanwhile, the problem of uninterrupted power supply of the data center is solved, and the overall system cost is reduced.
In order to solve the technical problem, the invention discloses an Energy storage and high-voltage direct-current coupling power supply and control system for a data center, which comprises an Energy Management System (EMS), an alternating current input power distribution system, a high-voltage direct-current device, a direct current output power distribution system, a backup storage battery management system (BMS # 1), a head cabinet for supplying power to a user load and an Energy storage system;
the alternating current input power distribution is a commercial power input end of the power supply and control system and is used as commercial power supply input of the power supply and control system, and the lower end of the alternating current input power distribution is connected with high-voltage direct current equipment;
the high-voltage direct current equipment comprises a high-voltage direct current rectifier module and a direct current bus, wherein commercial power is rectified by the high-voltage direct current rectifier module and then converted into high-voltage direct current, and the high-voltage direct current is subjected to electric energy distribution through the direct current bus; a direct current bus inside the high-voltage direct current equipment is connected with an energy storage system, a backup storage battery and direct current output power distribution in parallel; the high-voltage direct current rectifier module (AC/DC rectifier module) is a rectifier module device for converting alternating current into direct current;
the direct current output power distribution is connected with a column head cabinet powered by a user load, and is used for supplying power to the load;
a multifunctional electric meter for load monitoring is arranged in the column head cabinet for supplying power to the user load;
when the mains supply is interrupted, the backup storage battery can discharge instantaneously and supply power to the load through a direct current bus of the high-voltage direct current equipment, so that the interruption of the power supply of the load is avoided;
and the backup storage battery management system (1# BMS) collects parameters (current, voltage, temperature, internal resistance and the like) of the backup storage battery, and monitors and manages the parameters.
The energy storage system comprises a DC/DC bidirectional converter, a direct current cable, an energy storage container, an energy storage battery management system (2# BMS) and a direct current convergence cabinet;
the energy storage system is connected with a direct current bus of the high-voltage direct current equipment through a DC/DC bidirectional converter, the DC/DC bidirectional converter converts the applicable voltage of the high-voltage direct current equipment into the applicable voltage of an energy storage battery, the DC/DC bidirectional converter is connected with a direct current convergence cabinet through the lower end of a direct current cable, and the lower end of the direct current convergence cabinet is connected with the energy storage battery; a DC/DC bidirectional converter (DC/DC power conversion system, DC/DC PCS for short) which connects the battery system and the grid (and/or load) to realize bidirectional power conversion, and is a device for converting direct current and direct current;
the energy storage battery management system (2# BMS) monitors and manages the running state (including battery current, voltage, temperature, SOC, SOH and the like) of the energy storage battery; soc (state of charge), battery state of charge, which is used to reflect the remaining capacity of the battery, and is numerically defined as the ratio of the remaining capacity to the battery capacity, and is expressed by percentage; soh (state of health), battery state of health, the ratio of the energy released by the battery discharging to the cut-off voltage at a certain rate under the standard under-condition from the full-charged state to the nominal rated energy corresponding thereto;
and the Energy Management System (EMS) monitors and manages the state parameters of the high-voltage direct current equipment, the backup storage battery management system (1# BMS), the DC/DC bidirectional converter, the energy storage battery management system (2# BMS) and the multifunctional electric meter.
The DC/DC bidirectional converter carries out bidirectional conversion on the direct current, changes the voltage input and output by the DC/DC bidirectional converter, records the voltage of the input direct current as an L side, records the voltage of the output direct current as an H side, and has the voltage of 273V (which can be in the range of 240V-288V) on the L side and 750V (which can be in the range of 600V-900V) on the H side. The L side is connected with an output direct current bus of the high-voltage direct current equipment, the H side is connected with the direct current confluence cabinet and the energy storage battery to form a parallel structure of the energy storage system and a backup battery of the high-voltage direct current equipment, and the parallel point is located on the direct current bus of the high-voltage direct current equipment.
The energy management system is connected and communicated with an energy storage battery management system (2# BMS), a DC/DC bidirectional converter, high-voltage direct-current equipment, a backup storage battery management system (1# BMS) and a multifunctional electricity meter in a mode of Ethernet or RS485 communication protocol and the like;
the energy management system comprises a data collector and a server, wherein the data collector collects running state parameters (comprising running state, alternating voltage, alternating current, direct voltage, direct current and running output power) of the high-voltage direct-current equipment, state parameters (comprising current, voltage, temperature, internal resistance, SOC and the like) of a backup storage battery, running state parameters (comprising running state, current, voltage, input and output power and the like) of the DC/DC bidirectional converter and running state parameters (comprising current, voltage, temperature, SOC, SOH and the like) of the energy storage battery; monitoring management software is arranged in the server, corresponding data are calculated and logically judged, and system operation strategy management is carried out according to preset logic.
The method for calculating and logically judging the corresponding data and managing the system operation strategy according to the preset logic specifically comprises the following steps:
step 1, the energy storage system sets charging power, charging time and discharging time of a discharging power meter according to peak (including peak), valley, flat price and time of a user side, so as to realize profit sharing of peak-valley price difference;
step 2, when the energy storage system is in a charging state, the energy management system controls the sum of all load powers to be less than or equal to the rated output power of the high-voltage direct-current equipment, and the energy management system controls the charging power P of the energy storage battery through the DC/DC bidirectional convertercSo as to satisfy Pfc+Pl+Pc≤PrWherein P isfcIndicating reserve battery float power, P, for a high-voltage direct-current installationrIndicating the rated output power, P, of the HVDC apparatuscRepresenting the actual charging power, P, of the energy storage cell in the charging statelRepresenting the actual operating power consumed by the load;
step 3, when the energy storage system is in a discharge stateIn the state, the energy management system needs to control the discharge power of the energy storage battery through the DC/DC bidirectional converter so as to meet the requirement of Pd≤Pfc+PlAnd P iso≥0，PoRepresenting the actually captured output power, P, of the HVDC plantdRepresenting the actual discharge power of the energy storage battery in a discharge state;
and 4, when the mains supply is powered off, the high-voltage direct-current equipment does not have input voltage and current parameters, the high-voltage direct-current equipment uses a storage battery to perform instantaneous reverse discharge so as to ensure that the load supplies power uninterruptedly and maintain the output bus voltage of the high-voltage direct-current equipment, and the energy management system needs to judge the charging and discharging states of the energy storage battery and make corresponding control actions.
In step 4, the energy management system needs to determine the charge-discharge state of the energy storage battery and make a corresponding control action, and the method includes: regardless of the state of the energy storage battery, the energy management system directly controls the DC/DC bidirectional converter, so that the energy storage battery is in a standing state and is restarted after the mains supply is recovered.
On the other hand, in step 4, the energy management system needs to determine the charging and discharging state of the energy storage battery and make a corresponding control action, including: if the energy storage battery is in a charging state, the energy management system controls the DC/DC bidirectional converter to enable the energy storage system to stand still, so that the energy storage system is not charged any more; if the energy storage system is in the discharging state, the discharging state is maintained.
In the present invention, the Energy Management System (EMS) needs to collect detailed status parameters of the following operating devices:
1) detailed operating state parameters of the high-voltage direct-current device: including input current, voltage, power, and output voltage, current, power.
2) The operating state parameters of the energy storage battery are collected through a centralized BMS and comprise battery voltage, current, temperature, battery state of charge (SOC) and the like.
3) The operation state parameters of the DC/DC bidirectional converter comprise input current, voltage, power, output current, voltage, power and the like.
4) The power, current, voltage, power factor, etc. of the load carried by the high voltage direct current device.
5) Battery state for high voltage direct current devices.
The invention has the following beneficial effects:
1) the high-voltage direct-current equipment and the high-voltage direct-current equipment are coupled by the storage battery and the energy storage system through the output bus of the high-voltage direct-current equipment, so that functions of uninterrupted power supply, peak-valley arbitrage, demand side response, frequency modulation and peak regulation and the like of the energy storage system can be realized.
2) When the energy storage system discharges, the direct current side is used for supplying power, so that conversion is reduced, and the efficiency of a power supply system is improved.
3) The DC/DC converter is arranged outdoors, the energy storage battery is connected to the DC/DC converter on the indoor side through direct current voltage, the direct current voltage from the outdoor to the indoor section is generally 750V (which can be in the range of 600-900V), and the voltage range can effectively reduce direct current loss and reduce current specification type selection.
4) The outdoor side energy storage is arranged according to container prefabrication mode, arranges the energy storage battery outdoors with the mode of container, and the overall arrangement has improved the security, reaches modularization and expansibility requirement simultaneously.
Drawings
The foregoing and/or other advantages of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a high-voltage grid-connection schematic diagram of a household-side energy storage system.
Fig. 2 is a low-voltage grid-connection schematic diagram of a household-side energy storage system.
FIG. 3 is a diagram of system device components, connections, and EMS.
Fig. 4 is a schematic diagram of embodiment 1 of the high-voltage direct-current device with a single storage battery.
Fig. 5 is a schematic diagram of an embodiment 2 of the high-voltage direct-current device without a separate storage battery.
Detailed Description
The invention discloses an Energy storage and high-voltage direct-current coupling power supply and control system for a data center, which comprises an Energy Management System (EMS), an alternating current input power distribution system, a high-voltage direct-current device, a direct current output power distribution system, a backup storage battery management system (BMS 1#, BMS for battery management system), a head cabinet for supplying power to a user load and an Energy storage system;
the alternating current input power distribution is a commercial power input end of the power supply and control system and is used as commercial power supply input of the power supply and control system, and the lower end of the alternating current input power distribution is connected with high-voltage direct current equipment;
the high-voltage direct-current equipment comprises a high-voltage direct-current rectifier module and a direct-current bus, commercial power is rectified by the high-voltage direct-current rectifier module and then converted into high-voltage direct current, and the high-voltage direct current is subjected to electric energy distribution through the direct-current bus; a direct current bus inside the high-voltage direct current equipment is connected with an energy storage system, a backup storage battery and direct current output power distribution in parallel; the high-voltage direct current rectifier module (AC/DC rectifier module) is a rectifier module device for converting alternating current into direct current;
the direct current output power distribution is connected with a column head cabinet powered by a user load, and is used for supplying power to the load;
a multifunctional electric meter for load monitoring is arranged in the column head cabinet for supplying power to the user load;
when the mains supply is interrupted, the backup storage battery can discharge instantaneously and supply power to the load through a direct current bus of the high-voltage direct current equipment, so that the interruption of the power supply of the load is avoided;
and the backup storage battery management system (1# BMS) collects parameters (current, voltage, temperature, internal resistance and the like) of the backup storage battery and monitors and manages the parameters.
The energy storage system comprises a DC/DC bidirectional converter, a direct current cable, an energy storage container, an energy storage battery management system (2# BMS) and a direct current junction cabinet;
the energy storage system is connected with a direct current bus of the high-voltage direct current equipment through a DC/DC bidirectional converter, the DC/DC bidirectional converter converts the applicable voltage of the high-voltage direct current equipment into the applicable voltage of an energy storage battery, the DC/DC bidirectional converter is connected with a direct current convergence cabinet through the lower end of a direct current cable, and the lower end of the direct current convergence cabinet is connected with the energy storage battery; a DC/DC bidirectional converter (DC/DC power conversion system, DC/DC PCS for short) connecting the battery system and the power grid (and/or load) to realize power bidirectional conversion, and all are devices for direct current and direct current conversion;
the energy storage battery management system (2# BMS) monitors and manages the running state (including battery current, voltage, temperature, SOC, SOH and the like) of the energy storage battery; SOC (State of charge), the state of charge of the battery, which is used for reflecting the residual capacity of the battery, and is defined as the ratio of the residual capacity to the battery capacity on the numerical value, and the common percentage is expressed; soh (late of health), battery state of health, the ratio of the energy released by the battery discharging from full charge state to cut-off voltage under standard conditions to its corresponding nominal rated energy;
and the Energy Management System (EMS) monitors and manages the state parameters of the high-voltage direct current equipment, the backup storage battery management system (1# BMS), the DC/DC bidirectional converter, the energy storage battery management system (2# BMS) and the multifunctional electric meter.
The DC/DC bidirectional converter carries out bidirectional conversion on the direct current, changes the voltage input and output by the DC/DC bidirectional converter, records the voltage of the input direct current as an L side, records the voltage of the output direct current as an H side, and has the voltage of 273V (which can be in the range of 240V-288V) at the L side and 750V (which can be in the range of 600V-900V) at the H side. The L side is connected with an output direct current bus of the high-voltage direct current equipment, the H side is connected with the direct current confluence cabinet and the energy storage battery to form a parallel structure of the energy storage system and a backup battery of the high-voltage direct current equipment, and the parallel point is located on the direct current bus of the high-voltage direct current equipment.
The energy management system is connected and communicated with an energy storage battery management system (2# BMS), a DC/DC bidirectional converter, high-voltage direct-current equipment, a backup storage battery management system (1# BMS) and a multifunctional electric quantity meter in modes such as Ethernet or RS485 communication protocol;
the energy management system comprises a data collector and a server, wherein the data collector collects running state parameters (comprising running state, alternating voltage, alternating current, direct voltage, direct current and running output power) of the high-voltage direct-current equipment, backup storage battery state parameters (comprising current, voltage, temperature, internal resistance, SOC and the like), running state parameters (comprising running state, current, voltage, input and output power and the like) of the DC/DC bidirectional converter, and running state parameters (comprising current, voltage, temperature, SOC, SOH and the like) of the energy storage battery; monitoring management software is arranged in the server, corresponding data are calculated and logically judged, and system operation strategy management is carried out according to preset logic.
The method for calculating and logically judging the corresponding data and managing the system operation strategy according to the preset logic specifically comprises the following steps:
step 1, the energy storage system sets charging power, charging time and discharging time of a discharging power meter according to peak (including peak), valley, flat price and time of a user side, so as to realize profit sharing of peak-valley price difference;
step 2, when the energy storage system is in a charging state, the energy management system controls the sum of all load powers to be less than or equal to the rated output power of the high-voltage direct-current equipment, and controls the charging power P of the energy storage battery through the DC/DC bidirectional convertercSo that P is satisfiedfc+Pl+Pc≤PrWherein, PfcIndicating reserve battery float power, P, for a high-voltage direct-current installationrIndicating rated output power, P, of the HVDC apparatuscRepresenting the actual charging power, P, of the energy storage cell in the charging statelActual operating power representing load consumption;
step 3, when the energy storage system is in a discharging state, the energy management system needs to control the discharging power of the energy storage battery through the DC/DC bidirectional converter so as to meet the requirement of Pd≤Pfc+PlAnd P iso≥0，PoRepresenting the actually captured output power, P, of the HVDC plantdRepresenting the actual discharge power of the energy storage battery in a discharge state;
and 4, when the mains supply is powered off, the high-voltage direct-current equipment does not have input voltage and current parameters, the high-voltage direct-current equipment uses a storage battery to perform instantaneous reverse discharge so as to ensure that the load supplies power uninterruptedly and maintain the output bus voltage of the high-voltage direct-current equipment, and the energy management system needs to judge the charging and discharging states of the energy storage battery and make corresponding control actions.
In step 4, the energy management system needs to determine the charge-discharge state of the energy storage battery and make a corresponding control action, and the method includes: regardless of the state of the energy storage battery, the energy management system directly controls the DC/DC bidirectional converter, so that the energy storage battery is in a standing state and is restarted after the commercial power is recovered.
Or, in step 4 of the present invention, the energy management system needs to determine the charge/discharge state of the energy storage battery and make a corresponding control action, including: if the energy storage battery is in a charging state, the energy management system controls the DC/DC bidirectional converter to enable the energy storage system to stand still, so that the energy storage system is not charged any more; if the energy storage system is in the discharge state, the continuous discharge state is maintained.
Example 1
As shown in fig. 3, 4 and 5, 1 is a high voltage DC device, 1-1 is an AC/DC rectifier module, 1-2 is a DC bus, 1-3 is a DC output power distribution, 1-4 is a high voltage DC device monitoring module, 2-1 is a battery switch box for a backup battery, 2-2 is a backup battery for the high voltage DC device, 2-3 is a backup battery monitoring system (BMS # 1), 3 is an AC input power distribution, 4 is a column head cabinet (containing a multifunctional power meter for load monitoring) for load power distribution, 4-1 is a power distribution breaker in the column head cabinet, 4-2 is a multifunctional power meter in the column head cabinet, 5 is a DC/DC bidirectional converter, 5-1 is a converter module, 5-2 is a monitoring unit in the DC/DC bidirectional converter, 6 is the direct current cable, 7 is the direct current collection flow cabinet, 8 is the energy storage battery, 9 is the container, 10 is energy storage battery monitoring management system (2# BMS system for short), 11 is EMS (energy management system), 12 is communication protocols such as ethernet or RS485, 13 is the energy storage cabin (by 7, 8, 9, 10 constitutions). The energy storage system is composed of 5, 5-1, 5-2, 6, 7, 8, 9 and 10.
As shown in fig. 3, the present invention includes: the high-voltage direct current devices 1 and 2-3 are backup battery monitoring systems, a column head cabinet (including load monitoring) 4 for load power distribution, a DC/DC bidirectional converter 5, an energy storage battery management system (2# BMS) 10 and an EMS system (energy management system) 11 which are connected through communication protocols 12 such as Ethernet or RS485 and the like, so that the EMS system can monitor relevant parameters in real time and carry out operation logic control, and detailed control logic is as described above.
The high-voltage direct-current equipment 1 of the embodiment is independently provided with the storage battery 2, and the storage battery is a lead-acid storage battery generally, so that 15-minute uninterrupted power supply of a terminal load is met.
When the commercial power is normally supplied, the commercial power sequentially passes through the alternating current input power distribution 3 and then passes through the rectifier module 1-1 of the high-voltage direct current equipment 1 to output direct current, the bus voltage of the high-voltage direct current equipment 1 is maintained at about 273V, and the load power is supplied through the direct current output power distribution 1-3 and the column head cabinet 4. The direct current is simultaneously used for charging the storage battery 2, and the storage battery 2 is kept in a floating charging state. When the energy storage system is in a charging state, the direct current is simultaneously supplied to the energy storage battery 8 for charging, and the direct current passes through the DC/DC bidirectional converter 5, the direct current cable 6, the direct current combiner cabinet 7 and the energy storage battery 8 in sequence, and converts the electric energy into chemical energy to be stored in the energy storage battery 8. When the energy storage battery 8 is in a standing state, the EMS11 controls the energy storage battery 8 not to be charged or discharged through the DC/DC bidirectional converter 5. If the energy storage system is in a discharging state, the energy storage battery supplies power and maintains the voltage of about 273V of the direct current bus 1-2, the power is supplied to the load and the storage battery 2 is charged in a floating mode, and the electric energy of the commercial power supplied to the load through the alternating current input power distribution 3 is reduced.
When the commercial power is abnormally cut off, the EMS system 11 controls the DC/DC bidirectional converter 5 to switch the energy storage battery 8 from the original state (charging, discharging or standing) to the standing state. The storage battery 2 supplies power reversely, maintains the bus voltage of about 273V, and ensures that the load supplies power uninterruptedly.
Example 2
As shown in fig. 5, in the embodiment, the high voltage dc device 1 is not configured with a storage battery separately, and the configured capacity of the energy storage battery 8 is reserved to meet 15 minutes of capacity of uninterrupted power supply of a load and is not limited to the capacity requirement, in addition to performing peak-valley arbitrage, demand side response, frequency modulation and peak regulation. Meanwhile, the DC/DC bidirectional converter 5 meets the switching time within 10ms, namely when the mains supply is powered off and the alternating current input switch 3 does not input the mains supply, the DC/DC bidirectional converter 5 completes the switching from the charging state to the discharging state within 10ms, and the uninterrupted power supply requirement of the load is met. The rest was the same as in example 1.
The present invention provides an energy storage and high voltage direct current coupling power supply and control system for a data center, and a plurality of methods and ways for implementing the technical scheme are provided, the above description is only a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, a plurality of improvements and modifications may be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All the components not specified in this embodiment can be implemented by the prior art.

Claims (7)

1. An energy storage and high-voltage direct-current coupling power supply and control system for a data center is characterized by comprising an energy management system, an alternating-current input power distribution system, high-voltage direct-current equipment, a direct-current output power distribution system, a backup storage battery management system, a first row cabinet for supplying power to a user load and an energy storage system;
the alternating current input power distribution is a commercial power input end of the power supply and control system and is used as commercial power supply input of the power supply and control system, and the lower end of the alternating current input power distribution is connected with high-voltage direct current equipment;
the high-voltage direct current equipment comprises a high-voltage direct current rectifier module and a direct current bus, wherein commercial power is rectified by the high-voltage direct current rectifier module and then converted into high-voltage direct current, and the high-voltage direct current is subjected to electric energy distribution through the direct current bus; a direct current bus in the high-voltage direct current equipment is connected with an energy storage system, a backup storage battery and a direct current output power distribution in parallel; the high-voltage direct current rectifier module is a rectifier module device for converting alternating current into direct current;
the direct current output power distribution is connected with a column head cabinet powered by a user load, and is used for supplying power to the load;
a multifunctional electric meter for load monitoring is arranged in the column head cabinet for supplying power to the user load;
when the mains supply is interrupted, the backup storage battery can discharge instantaneously and supply power to the load through a direct current bus of the high-voltage direct current equipment, so that the interruption of the power supply of the load is avoided;
and the backup storage battery management system collects the parameters of the backup storage battery and monitors and manages the parameters.
2. The system of claim 1, wherein the energy storage system comprises a DC/DC bidirectional converter, a DC cable, an energy storage container, an energy storage battery management system, a DC combiner box;
the energy storage system is connected with a direct current bus of the high-voltage direct current equipment through a DC/DC bidirectional converter, the DC/DC bidirectional converter converts the applicable voltage of the high-voltage direct current equipment into the applicable voltage of an energy storage battery, the DC/DC bidirectional converter is connected with a direct current convergence cabinet through the lower end of a direct current cable, and the lower end of the direct current convergence cabinet is connected with the energy storage battery;
the energy storage battery management system monitors and manages the running state of the energy storage battery;
the energy management system monitors state parameters of the high-voltage direct-current equipment, the backup storage battery management system, the DC/DC bidirectional converter, the energy storage battery management system and the multifunctional electric meter and manages operation strategies.
3. The system according to claim 2, wherein the DC/DC bidirectional converter performs bidirectional conversion on the DC power, and changes the voltage of the DC/DC bidirectional converter entering and outputting, the voltage of the entering DC power is recorded as L side, and the voltage of the outputting DC power is recorded as H side, where the L side is connected to the output DC bus of the high voltage DC device, the H side is connected to the DC bus cabinet and the energy storage battery, so as to form a parallel connection structure of the energy storage system and the backup battery of the high voltage DC device, and the parallel connection point is located on the DC bus of the high voltage DC device.
4. The system of claim 3, wherein the energy management system is in communication with an energy storage battery management system, a DC/DC bi-directional converter, a high voltage DC device, a backup battery management system, and a multi-function fuel gauge;
the energy management system comprises a data acquisition unit and a server, wherein the data acquisition unit is used for acquiring the running state parameters of the high-voltage direct-current equipment, the state parameters of a backup storage battery, the running state parameters of the DC/DC bidirectional converter and the running state parameters of the energy storage battery; monitoring management software is arranged in the server, corresponding data are calculated and logically judged, and system operation strategy management is carried out according to preset logic.
5. The system of claim 4, wherein the calculating and logic determining of the corresponding data and the system operation policy management according to the preset logic comprise the following steps:
step 1, the energy storage system sets charging power, charging time and discharging time of a discharging power meter according to peak, valley, level price and time of a user side to realize peak-valley price difference arbitrage;
step 2, when the energy storage system is in a charging state, the energy management system controls the sum of all load powers to be less than or equal to the rated output power of the high-voltage direct-current equipment, and controls the charging power P of the energy storage battery through the DC/DC bidirectional convertercSo as to satisfy Pfc+Pl+Pc≤PrWherein, PfcRepresenting reserve battery float power, P, for HVDC installationsrIndicating the rated output power, P, of the HVDC apparatuscRepresenting the actual charging power, P, of the energy storage cell in the charged statelRepresenting the actual operating power consumed by the load;
step 3, when the energy storage system is in a discharging state, the energy management system needs to control the discharging power of the energy storage battery through the DC/DC bidirectional converter so as to meet the requirement of Pd≤Pfc+PlAnd P iso≥0，PoRepresenting the actually captured output power, P, of the HVDC plantdRepresenting the actual discharge power of the energy storage battery in a discharge state;
and 4, when the mains supply is powered off, the high-voltage direct-current equipment does not have input voltage and current parameters, the high-voltage direct-current equipment uses a storage battery to perform instantaneous reverse discharge so as to ensure that the load supplies power uninterruptedly and maintain the output bus voltage of the high-voltage direct-current equipment, and the energy management system needs to judge the charging and discharging states of the energy storage battery and make corresponding control actions.
6. The system according to claim 5, wherein in step 4, the energy management system needs to determine the charging/discharging state of the energy storage battery and perform corresponding control actions, and the method includes: regardless of the state of the energy storage battery, the energy management system directly controls the DC/DC bidirectional converter, so that the energy storage battery is in a standing state and is restarted after the mains supply is recovered.
7. The system according to claim 5, wherein in step 4, the energy management system needs to determine the charging/discharging state of the energy storage battery and perform corresponding control actions, and the method includes: if the energy storage battery is in a charging state, the energy management system controls the DC/DC bidirectional converter to enable the energy storage system to stand still, so that the energy storage system is not charged any more; if the energy storage system is in the discharging state, the discharging state is maintained.
CN202210409523.6A 2022-04-19 2022-04-19 Energy storage and high-voltage direct-current coupling power supply and control system for data center Pending CN114784785A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116494815A (en) * 2023-06-30 2023-07-28 万物新能(深圳)科技有限公司 Energy storage and charging pile integrated system, control method and management control server

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116494815A (en) * 2023-06-30 2023-07-28 万物新能(深圳)科技有限公司 Energy storage and charging pile integrated system, control method and management control server
CN116494815B (en) * 2023-06-30 2023-08-22 万物新能(深圳)科技有限公司 Energy storage and charging pile integrated system, control method and management control server

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