CN112510768A - Power supply system - Google Patents
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- CN112510768A CN112510768A CN202011327182.5A CN202011327182A CN112510768A CN 112510768 A CN112510768 A CN 112510768A CN 202011327182 A CN202011327182 A CN 202011327182A CN 112510768 A CN112510768 A CN 112510768A
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- 238000004146 energy storage Methods 0.000 claims abstract description 74
- 238000010248 power generation Methods 0.000 claims abstract description 71
- 238000012544 monitoring process Methods 0.000 claims description 47
- 238000003491 array Methods 0.000 claims description 20
- 230000007958 sleep Effects 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 210000000352 storage cell Anatomy 0.000 abstract 1
- 238000007726 management method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000013473 artificial intelligence Methods 0.000 description 3
- 230000005059 dormancy Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as AC or DC
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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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- 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
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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
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates in particular to power supply systems. The power supply system comprises one or more high-voltage direct current systems, one or more photovoltaic power generation systems, one or more energy storage batteries, an alternating current power supply system and an energy management system; one or more photovoltaic power generation systems are used for providing power to corresponding high-voltage direct-current systems; one or more energy storage cells for providing power to and/or receiving power from a corresponding high voltage direct current system; the alternating current power supply system is used for supplying power to one or more high-voltage direct current systems; one or more high voltage direct current systems for providing power to corresponding IT loads; the energy management system is used for controlling one or more photovoltaic power generation systems, one or more high-voltage direct current systems, one or more energy storage batteries and an alternating current power supply system. The invention realizes the hybrid power supply of high-voltage direct current and photovoltaic and can be used for a large-scale A-level data center.
Description
Technical Field
The invention relates in particular to power supply systems.
Background
As the size of data centers has increased, so has the power consumption. The huge electricity consumption brings huge pressure to the construction and operation of a data center and the operation of a power grid. The data center is a typical AC/DC high-energy consumption load center. The electricity generated by the photovoltaic system is direct current, and the output of the photovoltaic cell is supplied to the direct current electric equipment, so that the links of electric energy conversion can be reduced, and the power distribution efficiency is improved. The Zhang Bei data port uses the AC-DC hybrid power distribution network and the flexible transformer substation, and the electric energy is sent out by the centralized photovoltaic power station, and is transmitted to the flexible transformer substation after being boosted to 10kV through DC. The flexible transformer substation can output direct current 750V, alternating current 380V, direct current 10kV and alternating current 10kV, and electric energy can flow in two directions among ports, so that flexible distribution of electric energy in a power distribution network is realized. Patent CN206807028U proposes a photovoltaic power supply system for large data center, which mixes photovoltaic power generation and commercial power to supply power, and at the same time, configures a flywheel energy storage device to store energy. Patent CN205646845U proposes a system for supplying power to a data center by using clean energy entirely, which includes an ac power generating device and a dc power generating device, and supplies power to an ac load and a dc load through an ac bus and a dc bus, respectively. A converter is arranged between the AC/DC buses for realizing the conversion between AC and DC.
The centralized photovoltaic power station and the flexible transformer substation are adopted, the power companies need to participate together, the construction period is long, and the data center needing to be deployed quickly is not beneficial to large-scale application. The power supply systems provided by patents CN206807028U and CN205646845U cannot meet the requirements of a class a machine room in the power supply and distribution framework, and a large amount of energy storage batteries are required as backup power sources, thereby increasing the construction and operation investment.
Disclosure of Invention
The invention aims to provide a power supply system, which realizes the hybrid power supply of high-voltage direct current and photovoltaic and can be used for a large-scale A-level data center.
The embodiment of the invention discloses a power supply system, which comprises one or more high-voltage direct current systems, one or more photovoltaic power generation systems, one or more energy storage batteries, an alternating current power supply system and an energy management system;
the one or more photovoltaic power generation systems are respectively connected with the one or more high-voltage direct current systems and used for providing power for the corresponding high-voltage direct current systems;
the one or more energy storage batteries are respectively connected with the one or more high-voltage direct current systems and used for providing power to the corresponding high-voltage direct current systems and/or receiving power from the corresponding high-voltage direct current systems;
the alternating current power supply system is connected with the one or more high-voltage direct current systems and is used for supplying power to the one or more high-voltage direct current systems;
the one or more high-voltage direct current systems are respectively connected with one or more IT loads and used for providing power for the corresponding IT loads;
the energy management system is connected with the one or more photovoltaic power generation systems and the one or more high-voltage direct current systems and is used for controlling the one or more photovoltaic power generation systems, the one or more high-voltage direct current systems, the one or more energy storage batteries and the alternating current power supply system.
Optionally, each high-voltage direct-current system comprises a direct-current bus, a BMS module, a main monitoring module, and a rectification module;
the BMS module is connected with the corresponding energy storage battery;
the main monitoring module is connected with the BMS module and the rectifying module;
the rectification module is connected with the direct current bus;
and the direct current bus is connected with the corresponding IT load.
Optionally, each photovoltaic power generation system comprises one or more photovoltaic arrays, one or more DC/DC converters, a direct current distribution panel;
the one or more photovoltaic arrays are respectively connected with the one or more DC/DC converters;
the one or more DC/DC converters are connected with the direct current distribution panel;
the direct current distribution panel is connected with the direct current bus of the corresponding high-voltage direct current system.
Optionally, the energy storage battery is connected with the corresponding dc bus of the high-voltage dc system.
Optionally, the ac power supply system includes a utility power supply, a diesel generator set, a first ac bus, a power transformer, and a second ac bus;
the commercial power supply is connected with the first alternating current bus;
the diesel generator set is connected with the first alternating current bus;
the power transformer is connected with the first alternating current bus and the second alternating current bus;
the second ac bus is connected to the rectifier modules of the one or more hvdc systems.
Optionally, the energy management system includes a photovoltaic power generation power prediction module, an IT load power consumption prediction module, an energy storage battery acquisition module, a voltage monitoring module, and a power control module;
the photovoltaic power generation power prediction module is connected with the one or more photovoltaic power generation systems and the power control module and is used for receiving photovoltaic power generation power P from the one or more photovoltaic power generation systemsPVAnd sending the photovoltaic power generation power P to the power control modulePV；
The IT load power consumption prediction module is connected with the one or more IT loads and the power control module and is used for receiving IT load power consumption P from the one or more IT loadsITAnd sending the IT load power P to the power control moduleIT；
The energy storage battery acquisition module is connected with the BMS modules and the power control module of the one or more high-voltage direct current systems and is used for receiving the state of charge (SOC) of the energy storage battery from the corresponding energy storage battery through the BMS modulesbatAnd sending the state of charge (SOC) of the energy storage battery to the power control modulebat；
The voltage monitoring module is connected with the direct current bus and the power control module of the one or more high-voltage direct current systems and is used for receiving direct current bus voltage U from the direct current busDCAnd sending the DC bus voltage U to the power control moduleDC；
The power control module is connected with the main monitoring module of one or more high-voltage direct current systems and is used for generating power P based on the photovoltaic powerPVThe electric power P for the IT loadITThe state of charge SOCbatThe DC bus voltage UDCAnd sending a rectifier module sleep instruction or a rectifier module awakening instruction to the main monitoring module so as to sleep or awaken the corresponding rectifier module.
Optionally, the power control module is further connected with the one or more DC/DC converters of the one or more photovoltaic power generation systems for generating power P based on the photovoltaic powerPVThe electric power P for the IT loadITThe state of charge SOCbatThe DC bus voltage UDCAnd sending an energy storage battery charging instruction or an energy storage battery discharging instruction to the main monitoring module so as to charge or discharge the corresponding energy storage battery through the BMS module, and sending a photovoltaic array constant power mode instruction or a photovoltaic array MPPT mode instruction to the one or more DC/DC converters so as to enable the corresponding one or more photovoltaic arrays to work in a constant power mode or an MPPT mode.
Optionally, when the photovoltaic power generation power PPVIs greater than the IT load power PITWhen the temperature of the water is higher than the set temperature,
if the state of charge SOCbatIf the current value is greater than the upper limit threshold value, sending a rectifier module sleep instruction to all the main monitoring modules to sleep all the rectifier modules, and sending a photovoltaic array constant power mode instruction to the one or more DC/DC converters to enable the corresponding one or more photovoltaic arrays to work in a constant power mode;
if the state of charge SOCbatIf the maximum power supply voltage is less than the upper limit threshold, sending a rectifier module sleep instruction to all the main monitoring modules to sleep all the rectifier modules, sending a photovoltaic array MPPT mode instruction to the one or more DC/DC converters to enable the corresponding one or more photovoltaic arrays to work in the MPPT mode, and sending an energy storage battery charging instruction to the main monitoring modules to enable the corresponding energy storage batteries to be charged through the BMS modules.
Optionally, when the photovoltaic power generation powerPPVIs less than the IT load electric power PITWhen the MPPT mode command is sent to the one or more DC/DC converters, the one or more photovoltaic arrays are operated in the MPPT mode, and
if the state of charge SOCbatIf the current value is greater than the lower limit threshold value, sending an energy storage battery discharging instruction to the BMS module so that the corresponding energy storage battery is discharged, and sending a rectification module awakening instruction to part of the main monitoring modules so as to awaken the corresponding rectification module;
if the state of charge SOCbatAnd if the current value is less than the lower limit threshold value, sending an energy storage battery charging instruction to the BMS module so as to charge the corresponding energy storage battery, and sending a rectification module awakening instruction to part of the main monitoring modules so as to awaken the corresponding rectification module.
Optionally, the DC/DC converter includes a Boost circuit, a PWM controller, and a PI controller.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
the power supply system of the invention fully utilizes the roof space of the data center and the top of the container equipment to arrange the photovoltaic power generation system, the electric energy generated by the photovoltaic power generation system is connected into the high-voltage direct current system to be directly consumed by the direct current equipment, and the alternating current equipment is supplied with power by the alternating current power supply system, thus the consumption of the data center to the electric energy of the commercial power can be reduced. In addition, the power supply system adopts a photovoltaic power generation system to directly supply direct current equipment, so that the power conversion times can be reduced, and the power consumption is reduced. Meanwhile, the power supply system is additionally provided with an energy management system, and the photovoltaic power generation system, the high-voltage direct-current system, the energy storage battery and the alternating-current power supply system are managed and controlled in a unified manner, so that the conflict between the high-voltage direct-current system and the photovoltaic power generation system can be avoided. The power distribution framework can preferentially utilize solar power generation to the greatest extent, reduces consumption of fossil energy, can meet the power supply reliability requirement of an A-level machine room, and can meet the construction period and rapid delivery requirements of a data center.
Drawings
Fig. 1 shows a schematic configuration of a power supply system according to the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Fig. 1 shows a schematic configuration of a power supply system according to the present invention.
As shown in fig. 1, the power supply system includes one or more high voltage direct current systems, one or more photovoltaic power generation systems, one or more energy storage batteries, an alternating current power supply system, and an energy management system; one or more photovoltaic power generation systems are respectively connected with one or more high-voltage direct current systems and used for providing power for the corresponding high-voltage direct current systems; the one or more energy storage batteries are respectively connected with one or more high-voltage direct current systems and used for providing power to the corresponding high-voltage direct current systems and/or receiving power from the corresponding high-voltage direct current systems; the alternating current power supply system is connected with one or more high-voltage direct current systems and is used for supplying power to the one or more high-voltage direct current systems; the one or more high-voltage direct current systems are respectively connected with one or more IT loads and used for providing power for the corresponding IT loads; the energy management system is connected with one or more photovoltaic power generation systems and one or more high-voltage direct current systems and is used for controlling the one or more photovoltaic power generation systems, the one or more high-voltage direct current systems, the one or more energy storage batteries and the alternating current power supply system.
The power supply system of the invention fully utilizes the roof space of the data center and the top of the container equipment to arrange the photovoltaic power generation system, the electric energy generated by the photovoltaic power generation system is connected into the high-voltage direct current system to be directly consumed by the direct current equipment, and the alternating current equipment is supplied with power by the alternating current power supply system, thus the consumption of the data center to the electric energy of the commercial power can be reduced. In addition, the power supply system adopts a photovoltaic power generation system to directly supply direct current equipment, so that the power conversion times can be reduced, and the power consumption is reduced. Meanwhile, the power supply system is additionally provided with an energy management system, and the photovoltaic power generation system, the high-voltage direct-current system, the energy storage battery and the alternating-current power supply system are managed and controlled in a unified manner, so that the conflict between the high-voltage direct-current system and the photovoltaic power generation system can be avoided. The power distribution framework can preferentially utilize solar power generation to the greatest extent, reduces consumption of fossil energy, can meet the power supply reliability requirement of an A-level machine room, and can meet the construction period and rapid delivery requirements of a data center.
Each high-voltage direct-current System comprises a direct-current bus, a Battery Management System (BMS) module, a main monitoring module and a rectifying module; the BMS module is connected with the corresponding energy storage battery; the main monitoring module is connected with the BMS module and the rectifying module; the rectification module is connected with the direct current bus; the direct current bus is connected with the corresponding IT load.
The high-voltage direct-current system can adopt a discrete type or a combined type, and the direct-current bus can be a direct-current 240V/336V bus.
Each photovoltaic power generation system comprises one or more photovoltaic arrays, one or more DC/DC converters and a direct current distribution panel; one or more photovoltaic arrays are respectively connected with one or more DC/DC converters; one or more DC/DC converters are connected with the direct current distribution panel; the direct current distribution panel is connected with a direct current bus of a corresponding high-voltage direct current system.
The photovoltaic power generation system takes a photovoltaic array as a power generation component, grouping is carried out through reasonable series-parallel connection, the capacity of a single set of photovoltaic power generation system is matched with the capacity of a single set of high-voltage direct-current system, the fault tolerance of the system can be improved, the operation and maintenance cost of the system is reduced, and the range of the capacity of the single set can be 120kw to 480 kw.
The DC/DC converter comprises a Boost circuit, a PWM controller and a PI controller, and can realize two modes of constant power control and MPPT control. Under the constant power control mode, the output power of the photovoltaic array is compared with the reference power, and the PI controller is used for tracking the reference power in real time to enable the photovoltaic array to output the constant power to balance the power of the system. When the IT load is low in the early period of the project, the DC/DC converter can be operated in a constant power control mode. The MPPT control mode is realized by adopting a variable step conductance incremental method, the maximum power tracking control is carried out on the output of each group of photovoltaic arrays, and the maximum power output of each group of photovoltaic arrays is ensured when the external environment changes.
Wherein the dc distribution panel converges the output of the photovoltaic array and connects the output to a dc bus connection of the high voltage dc system.
The energy storage battery is connected with a direct current bus of the corresponding high-voltage direct current system.
The energy storage battery can be a lead-acid battery or a lithium battery.
The alternating current power supply system comprises a mains supply, a diesel generator set, a first alternating current bus, a power transformer and a second alternating current bus; the commercial power supply is connected with the first alternating current bus; the diesel generator set is connected with the first alternating current bus; the power transformer is connected with the first alternating current bus and the second alternating current bus; the second alternating current bus is connected with one or more rectifier modules of the high-voltage direct current system.
Wherein the first ac bus may be an ac 10kV bus and the second ac bus may be an ac 380V bus.
The energy management system comprises a photovoltaic power generation power prediction module, an IT load power consumption prediction module, an energy storage battery acquisition module, a voltage monitoring module and a power control module; the photovoltaic power generation power prediction module is connected with one or more photovoltaic power generation systems and the power control module and is used for receiving photovoltaic power generation power P from the one or more photovoltaic power generation systemsPVAnd sends the photovoltaic power generation power P to the power control modulePV(ii) a The IT load power consumption prediction module is connected with one or more IT loads and the power control module and is used for receiving the IT load power consumption P from one or more IT loadsITAnd sends the power P for IT load to the power control moduleIT(ii) a The energy storage battery acquisition module is connected with one or more BMS modules and power control modules of the high-voltage direct current system and is used for transmitting power to the BMS modulesThe block receives the state of charge SOC of the energy storage battery from the corresponding energy storage batterybatAnd sending the state of charge (SOC) of the energy storage battery to the power control modulebat(ii) a The voltage monitoring module is connected with one or more direct current buses and power control modules of the high-voltage direct current system and used for receiving direct current bus voltage U from the direct current busesDCAnd sends a DC bus voltage U to the power control moduleDC(ii) a The power control module is connected with one or more main monitoring modules of the high-voltage direct-current system and used for generating power P based on photovoltaic powerPVAnd electric power P for IT loadITSOC of the batterybatDC bus voltage UDCAnd sending a rectifier module sleep instruction or a rectifier module awakening instruction to the main monitoring module so as to sleep or awaken the corresponding rectifier module.
The photovoltaic power generation power prediction module can be communicated with a photovoltaic power generation system, combines the current sunshine type, irradiance, ambient temperature and the like as parameters, takes hours as a time scale, and adopts an artificial intelligence algorithm to predict the short-term power.
The IT load power utilization prediction module can be communicated with the IT load through a power monitoring system for monitoring the IT load, and adopts an artificial intelligence algorithm to predict the short-term power according to historical power utilization data and by taking hours as a time scale.
Wherein, the energy storage battery acquisition module can communicate with the BMS module to receive an energy storage battery state of charge.
The voltage monitoring module comprises a voltage signal acquisition module, a communication module and the like, can monitor whether the actual voltage of the direct current bus is stable or not, can set the voltage fluctuation range to be +/-10% of a rated value, and feeds a monitoring result back to the power control module.
The power control module is provided with RS485, RS232 or Ethernet interfaces, can be communicated with the photovoltaic power generation power prediction module, the IT load power consumption prediction module, the energy storage battery acquisition module and the voltage monitoring module, and calculates the charging and discharging power P of the current energy storage batterybatFor photovoltaic power generation power PPVAnd IT load power PITAnd stored energy electricityCharge and discharge power P of the cellbatAnd the sum is compared and fed back to a main monitoring module of the high-voltage direct-current system to control the dormancy or awakening of a rectifying module in the high-voltage direct-current system.
The power control module is also connected with one or more DC/DC converters of one or more photovoltaic power generation systems and is used for generating power P based on photovoltaic powerPVAnd electric power P for IT loadITSOC of the batterybatDC bus voltage UDCAnd sending an energy storage battery charging instruction or an energy storage battery discharging instruction to the main monitoring module so as to charge or discharge the corresponding energy storage battery through the BMS module, and sending a photovoltaic array constant power mode instruction or a photovoltaic array MPPT mode instruction to the one or more DC/DC converters so as to enable the corresponding one or more photovoltaic arrays to work in a constant power mode or an MPPT mode.
When photovoltaic power generation power PPVIs greater than the electric power P for IT loadITWhen, if the state of charge SOCbatIf the power supply voltage is larger than the upper limit threshold, sending rectifier module sleep instructions to all the main monitoring modules to sleep all the rectifier modules, and sending photovoltaic array constant power mode instructions to one or more DC/DC converters to enable the corresponding one or more photovoltaic arrays to work in a constant power mode; if state of charge SOCbatAnd if the maximum power supply voltage is less than the upper limit threshold, sending a rectifier module sleep instruction to all the main monitoring modules to sleep all the rectifier modules, sending a photovoltaic array MPPT mode instruction to one or more DC/DC converters to enable the corresponding one or more photovoltaic arrays to work in the MPPT mode, and sending an energy storage battery charging instruction to the main monitoring modules to charge the corresponding energy storage batteries through the BMS module.
When photovoltaic power generation power PPVLess than IT load electric power PITAt the time, sending a photovoltaic array MPPT mode instruction to one or more DC/DC converters to cause the corresponding one or more photovoltaic arrays to operate in the MPPT mode, and if the state of charge SOC is in the MPPT modebatIf the voltage is greater than the lower limit threshold value, an energy storage battery discharging instruction is sent to the BMS module so that the corresponding energy storage battery is discharged and part of the energy storage batteries are dischargedThe main monitoring module sends a rectification module awakening instruction to awaken the corresponding rectification module; wherein the power of the awakened high-voltage direct-current system is PHVDC＝|PIT-PPV-PbatL, |; if state of charge SOCbatIf the current value is less than the lower limit threshold value, sending an energy storage battery charging instruction to the BMS module so as to charge the corresponding energy storage battery, and sending a rectification module awakening instruction to part of main monitoring modules so as to awaken the corresponding rectification module; wherein the power of the awakened high-voltage direct-current system is PHVDC＝|PIT-PPV+Pbat|。
The energy management system adopts a layered control architecture.
The first layer is photovoltaic power generation power prediction, IT load power consumption prediction and energy storage battery charging and discharging power calculation.
The second layer is power control, and according to the predicted photovoltaic power generation power, the predicted IT load power consumption power and the charge-discharge power required by the battery, the required electric power for the commercial power side can be calculated and fed back to the main monitoring module of the high-voltage direct-current system. The main monitoring module calculates the capacity of the rectifier module which needs to work normally according to the actual power load and the redundancy module, so that the rest rectifier modules are in dormancy.
Meanwhile, the predicted power and the actual value have certain deviation, and the output of the photovoltaic power generation system fluctuates, so that the voltage monitoring module is arranged to monitor the direct-current bus voltage in real time. By controlling the voltage of the direct current bus to be kept constant, energy balance between the power supply side and the load side can be realized, and the reliability of power supply is guaranteed. If the voltage of the direct-current bus is monitored to be increased to be more than 10% of the rated value, the photovoltaic power generation power and the power grid input power are larger than the power demand of a load side, the power control module sends an instruction to the main monitoring module, and the rectifier modules in part of working states are dormant until the voltage of the direct-current bus is recovered to be stable; if the direct-current bus voltage is monitored to be reduced to 90% or below the rated value, the photovoltaic power generation power and the power grid input power cannot meet the power requirement of the load side, the power control module sends an instruction to the main monitoring module, and the partially dormant rectifying module is awakened until the direct-current bus voltage is recovered to be stable.
The third layer is energy optimization operation, an optimization strategy is formulated by adopting an artificial intelligence algorithm according to information such as photovoltaic power generation system power, IT load power consumption, market price and the like, an energy storage battery and photovoltaic power generation are adopted to supply power to the IT load as far as possible when the peak price is reached, the energy storage battery is charged by using commercial power and the IT load is supplied with power when the valley price is reached, and flexible scheduling of the photovoltaic power supply, the commercial power, the energy storage battery and the IT load is realized.
It should be noted that, each unit/module mentioned in each device embodiment of the present invention is a logical unit/module, and physically, one logical unit may be one physical unit, or may be a part of one physical unit, or may be implemented by a combination of multiple physical units, and the physical implementation manner of these logical units itself is not the most important, and the combination of the functions implemented by these logical units is the key to solve the technical problem provided by the present invention. Furthermore, the above-mentioned embodiments of the apparatus of the present invention do not introduce elements that are less relevant for solving the technical problems of the present invention in order to highlight the innovative part of the present invention, which does not indicate that there are no other elements in the above-mentioned embodiments of the apparatus.
It is to be noted that in the claims and the description of the present patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A power supply system is characterized by comprising one or more high-voltage direct current systems, one or more photovoltaic power generation systems, one or more energy storage batteries, an alternating current power supply system and an energy management system;
the one or more photovoltaic power generation systems are respectively connected with the one or more high-voltage direct current systems and used for providing power for the corresponding high-voltage direct current systems;
the one or more energy storage batteries are respectively connected with the one or more high-voltage direct current systems and used for providing power to the corresponding high-voltage direct current systems and/or receiving power from the corresponding high-voltage direct current systems;
the alternating current power supply system is connected with the one or more high-voltage direct current systems and is used for supplying power to the one or more high-voltage direct current systems;
the one or more high-voltage direct current systems are respectively connected with one or more IT loads and used for providing power for the corresponding IT loads;
the energy management system is connected with the one or more photovoltaic power generation systems and the one or more high-voltage direct current systems and is used for controlling the one or more photovoltaic power generation systems, the one or more high-voltage direct current systems, the one or more energy storage batteries and the alternating current power supply system.
2. The power supply system of claim 1, wherein each said high voltage dc system comprises a dc bus, a BMS module, a main monitoring module, a rectifier module;
the BMS module is connected with the corresponding energy storage battery;
the main monitoring module is connected with the BMS module and the rectifying module;
the rectification module is connected with the direct current bus;
and the direct current bus is connected with the corresponding IT load.
3. The power supply system of claim 2, wherein each of said photovoltaic power generation systems comprises one or more photovoltaic arrays, one or more DC/DC converters, a DC distribution panel;
the one or more photovoltaic arrays are respectively connected with the one or more DC/DC converters;
the one or more DC/DC converters are connected with the direct current distribution panel;
the direct current distribution panel is connected with the direct current bus of the corresponding high-voltage direct current system.
4. The power supply system of claim 3, wherein the energy storage battery is connected to the corresponding DC bus of the HVDC system.
5. The power supply system of claim 4, wherein the AC power supply system comprises a mains power supply, a diesel generator set, a first AC bus, a power transformer, a second AC bus;
the commercial power supply is connected with the first alternating current bus;
the diesel generator set is connected with the first alternating current bus;
the power transformer is connected with the first alternating current bus and the second alternating current bus;
the second ac bus is connected to the rectifier modules of the one or more hvdc systems.
6. The power supply system of claim 5, wherein the energy management system comprises a photovoltaic power generation power prediction module, an IT load power consumption prediction module, an energy storage battery collection module, a voltage monitoring module, and a power control module;
the photovoltaic power generation power prediction module is connected with the one or more photovoltaic power generation systems and the power control module and is used for receiving photovoltaic power generation power P from the one or more photovoltaic power generation systemsPVAnd sending the photovoltaic power generation power P to the power control modulePV；
The IT load power consumption prediction module is connected with the one or more IT loads and the power control module and is used for receiving IT load power consumption P from the one or more IT loadsITAnd sending the IT load power P to the power control moduleIT；
The energy storage battery acquisition module is connected with the BMS modules and the power control module of the one or more high-voltage direct current systems and is used for receiving the state of charge (SOC) of the energy storage battery from the corresponding energy storage battery through the BMS modulesbatAnd sending the state of charge (SOC) of the energy storage battery to the power control modulebat；
The voltage monitoring module is connected with the direct current bus and the power control module of the one or more high-voltage direct current systems and is used for receiving direct current bus voltage U from the direct current busDCAnd sending the DC bus voltage U to the power control moduleDC；
The power control module is connected with the main monitoring module of one or more high-voltage direct current systems and is used for generating power P based on the photovoltaic powerPVThe electric power P for the IT loadITThe state of charge SOCbatThe DC bus voltage UDCAnd sending a rectifier module sleep instruction or a rectifier module awakening instruction to the main monitoring module so as to sleep or awaken the corresponding rectifier module.
7. The power supply system of claim 6, wherein the power control module is further coupled to the one or more DC/DC converters of the one or more photovoltaic power generation systems for generating power P based on the photovoltaic power generationPVThe IT negativeElectric power P for loadITThe state of charge SOCbatThe DC bus voltage UDCAnd sending an energy storage battery charging instruction or an energy storage battery discharging instruction to the main monitoring module so as to charge or discharge the corresponding energy storage battery through the BMS module, and sending a photovoltaic array constant power mode instruction or a photovoltaic array MPPT mode instruction to the one or more DC/DC converters so as to enable the corresponding one or more photovoltaic arrays to work in a constant power mode or an MPPT mode.
8. The power supply system of claim 7, wherein when said photovoltaic power P is generatedPVIs greater than the IT load power PITWhen the temperature of the water is higher than the set temperature,
if the state of charge SOCbatIf the current value is greater than the upper limit threshold value, sending a rectifier module sleep instruction to all the main monitoring modules to sleep all the rectifier modules, and sending a photovoltaic array constant power mode instruction to the one or more DC/DC converters to enable the corresponding one or more photovoltaic arrays to work in a constant power mode;
if the state of charge SOCbatIf the maximum power supply voltage is less than the upper limit threshold, sending a rectifier module sleep instruction to all the main monitoring modules to sleep all the rectifier modules, sending a photovoltaic array MPPT mode instruction to the one or more DC/DC converters to enable the corresponding one or more photovoltaic arrays to work in the MPPT mode, and sending an energy storage battery charging instruction to the main monitoring modules to enable the corresponding energy storage batteries to be charged through the BMS modules.
9. The power supply system of claim 7, wherein when said photovoltaic power P is generatedPVIs less than the IT load electric power PITWhen the MPPT mode command is sent to the one or more DC/DC converters, the one or more photovoltaic arrays are operated in the MPPT mode, and
if the state of charge SOCbatIf the current value is greater than the lower limit threshold value, sending an energy storage battery discharging instruction to the BMS module so that the corresponding energy storage battery is discharged, and sending a rectification module awakening instruction to part of the main monitoring modules so as to awaken the corresponding rectification module;
if the state of charge SOCbatAnd if the current value is less than the lower limit threshold value, sending an energy storage battery charging instruction to the BMS module so as to charge the corresponding energy storage battery, and sending a rectification module awakening instruction to part of the main monitoring modules so as to awaken the corresponding rectification module.
10. The power supply system of claim 7, wherein the DC/DC converter comprises a Boost circuit, a PWM controller, a PI controller.
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