CN114221369B - High-voltage direct-current power supply system based on optical storage direct-current micro-grid and energy management method thereof - Google Patents
High-voltage direct-current power supply system based on optical storage direct-current micro-grid and energy management method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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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- 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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The system comprises a photovoltaic power generation module, an alternating current power grid and a hybrid energy storage module; the photovoltaic power generation module is connected with the direct current bus through the first DC/DC converter; the alternating current power grid is connected with a direct current bus through a bidirectional AC/DC converter; the hybrid energy storage module comprises a storage battery and a super capacitor, and the storage battery and the super capacitor are respectively connected with a direct current bus through a second DC/DC converter and a third DC/DC converter. The direct current bus is connected with a load. The high-voltage direct current power supply system based on the light storage direct current micro-grid integrates the advantages of a UPS power supply system, and can reduce the operation cost and the energy consumption; greatly improves the efficiency and the safety and the reliability of a power supply system.
Description
Technical Field
The invention relates to the technical field of direct current power supply, in particular to a high-voltage direct current power supply system based on an optical storage direct current micro-grid and an energy management method thereof.
Background
With the rapid development of intelligent industries such as big data and 5G, a huge amount of data is generated, and a huge data center needs to be established for processing the data. However, the problem of energy consumption of data centers is also an important concern today. On the basis of considering the development of high-speed informatization of bearing, further searching for a more energy-saving power supply mode is a problem to be solved in the current data center. The traditional-48V direct current power supply system of the data center supplies power to the IT system after alternating current/direct current conversion, and is typically characterized by adopting-48V direct current power supply, and the system has the advantages of low voltage level, large current, short power supply distance and small voltage fluctuation; the 220VUPS system supplies power to IT system equipment after AC/DC and DC/AC conversion, and is typically characterized by using 220V alternating current power supply, higher voltage level, smaller current and longer power supply distance.
The currently used UPS hosts are mainly of an on-line double-conversion type, and when the load rate is gradually increased, the conversion efficiency of the switch can achieve a similar effect as that of a power supply switch, but in specific applications and re-operation, the switch often suffers from some fluctuation, and in general, the maximum load rate of a single machine design of the UPS is thirty percent to forty percent, but as the influence of back-end equipment, the system usually reaches the corresponding load rate in the middle and later stages, and if the long-term re-load rate is extremely low, the conversion efficiency reaches eighty percent, and possibly lower levels. The basic architecture of the UPS power supply system depends on the reliability of the system overall, and meanwhile, the reliability of the overall system is lower than that of a single accessory, so that in order to solve the problems of low reliability and the like, a power supply mode capable of connecting multiple machines in parallel is needed to solve the problem of high operation cost of the system, and meanwhile, the problems of specific supply and load are also solved.
Disclosure of Invention
The invention provides a high-voltage direct current power supply system based on an optical storage direct current micro-grid, which integrates the advantages of a UPS power supply system and can reduce the operation cost and the energy consumption; greatly improves the efficiency and the safety and the reliability of a power supply system.
The technical scheme adopted by the invention is as follows:
high-voltage direct current power supply system based on light stores up direct current micro-grid, this system includes: the system comprises a photovoltaic power generation module, an alternating current power grid and a hybrid energy storage module;
the photovoltaic power generation module is connected with a direct current bus L0 through a first DC/DC converter;
the alternating current power grid is connected with a direct current bus L0 through a bidirectional AC/DC converter;
the hybrid energy storage module comprises a storage battery and a super capacitor, the storage battery and the super capacitor are respectively connected with a direct current bus L0 through a second DC/DC converter and a third DC/DC converter, and the storage battery adopts a lithium battery.
The direct current bus is connected with a load.
The photovoltaic power generation module comprises a plurality of photovoltaic power generation units, the photovoltaic power generation units form a photovoltaic array in parallel, and the photovoltaic array is connected into a 336V direct current bus through a boost DC/DC converter.
The load comprises a CPU, a hard disk, a fan and an air conditioner;
the direct current bus L0 is connected through a fourth DC/DC converter;
the direct current bus L0 is connected with the hard disk through a fifth DC/DC converter;
the direct current bus L0 is connected with a fan through a sixth DC/DC converter;
the direct current bus L0 is connected with an air conditioner through a DC/AC converter.
The invention discloses a high-voltage direct current power supply system based on an optical storage direct current micro-grid and an energy management method thereof, which have the following technical effects:
1) The middle links are greatly reduced, so that the energy loss is greatly reduced, the working efficiency is greatly improved, the power supply system is not difficult to operate in the operation process, a large number of modules can be connected in parallel, and the utilization rate of other modules is improved. In addition, the system of the high-voltage direct current does not have a static bypass switch and a plurality of specific processors, so that devices on a host are reduced, the performance of the host is greatly improved, and the running cost is reduced.
2) The high-voltage direct-current power supply system can be used under the condition of reloading by the storage battery pack when the system fails, so that the safety and the reliability of the power supply system can be improved greatly technically.
3) The high-voltage direct-current power supply system adopts a modularized structure, so that the conversion efficiency of equipment can be kept at a higher level in specific operation.
4) The invention adopts a multi-source power supply mode, preferentially adopts renewable energy sources to generate power and a power grid to supply power, takes the hybrid energy storage module as a standby, can be connected with a three-phase alternating current power grid, and can greatly improve the reliability of the power supply of the data center.
5) The lithium battery and the super capacitor are combined to be used as the hybrid energy storage module, so that the advantage of high capacity of the lithium battery can be exerted, and the high power density of the super capacitor can be utilized to the greatest extent. When the micro-grid load changes, the hybrid energy storage module is put into operation, the super capacitor is used for fast response, high-capacity power is provided in a short time, stability of system voltage is guaranteed, and then the lithium battery is used for power support to bear the change of full-capacity load power.
Drawings
Fig. 1 is a schematic diagram of a power supply system according to the present invention.
FIG. 2 is a schematic diagram of the power management control of the power supply system of the present invention.
FIG. 3 (1) is a schematic diagram of a control portion of a photovoltaic module;
FIG. 3 (2) is a schematic diagram of a hybrid energy storage control section;
fig. 3 (3) is a schematic diagram of a power grid interface control part.
FIG. 4 (1) is a schematic diagram of a control circuit of a power grid interface unit converter;
FIG. 4 (2) is a schematic diagram of a photovoltaic power module interface converter control circuit;
fig. 4 (3) is a schematic diagram of a hybrid energy storage unit inverter control circuit.
Detailed Description
The high-voltage direct current power supply is a novel power supply system based on a-48V direct current power supply system, and the advantages of the UPS power supply system are concentrated. And concentrates the classification of UPS power systems into 336V high voltage direct current (High Voltage Direct Current, HVDC) systems and 240V HVDC systems according to their voltage levels. The 336V and 240V HVDC have similar principles, but are different in voltage level, and the 336V direct current PSU (Power Supply Unit, power supply device) has higher power supply efficiency because of one less rectifying link compared with the 240V direct current PSU. However, the 336V high-voltage direct-current voltage level is higher, and the operating current of the 336V HVDC system is about 40% lower than that of the 240V HVDC system under the same power condition, so that the nonferrous metal consumption, the energy loss and the machine occupied area can be saved.
As shown in fig. 1, a high-voltage dc power supply system based on an optical storage dc micro-grid, the system comprising: the photovoltaic power generation system comprises a photovoltaic power generation module A, an alternating current power grid B, a hybrid energy storage module C and a load D. The alternating current power grid B, the hybrid energy storage module C, the photovoltaic power generation module A and the positive electrode and the negative electrode of the load D are respectively connected in a common mode, and the common node of the positive electrode is A; the common node of the cathode electrode is B, the potential of the common node electrode is the same, and the specific connection mode is as follows:
the photovoltaic power generation module A is connected with the direct current bus L0 through the first DC/DC converter 1, the photovoltaic power generation module A comprises a plurality of photovoltaic power generation units a, the photovoltaic power generation units a form a photovoltaic array in parallel connection, and the photovoltaic array is connected into a 336V direct current bus through the boost DC/DC converter. P in FIG. 1 pv Representing the energy flow of the photovoltaic array.
The AC power grid B is connected to the DC bus L0 via a bidirectional AC/DC converter 2. When the energy stored by the photovoltaic power generation module A and the hybrid energy storage module C can not meet the requirement of the load D, the bidirectional AC/DC converter 2 is in a rectification mode; when the energy generated by the photovoltaic power generation module a is far greater than the demand of the load D, the bidirectional AC/DC converter 2 is in an inversion mode, and the surplus energy is fed into the large power grid. P (P) grid Representing the power grid exchanging power with the dc bus.
The hybrid energy storage module C comprises a storage battery 3 and a super capacitor 4, and the storage battery 3 and the super capacitor 4 are respectively connected with a direct current bus L0 through a second DC/DC converter 5 and a third DC/DC converter 6. The structure can better control the hybrid energy storage module C, and the external power requirement can be met. P (P) bat 、P sc The exchange power of the storage battery, the super capacitor and the direct current bus is respectively shown.
The direct current bus is connected with a load D of the data center, and the load D comprises a CPU, a hard disk D1, a fan D2 and an air conditioner D3;
the direct current bus L0 is connected with the CPU through a fourth DC/DC converter 7; the bus voltage firstly reduces +336V to about +24V through the fourth DC/DC converter 7, and secondly supplies power to the CPU by about +1.2V through the voltage divider.
The DC bus L0 is connected to the hard disk d1 through a fifth DC/DC converter 8. The power supply mode of the hard disk d1 is to reduce +336V to +12V or +5V through two-stage power conversion.
The DC bus L0 is connected to the fan d2 via a sixth DC/DC converter 9. The power supply mode of the fan d2 is to reduce +336V to about +220V by the sixth DC/DC converter 9.
The DC bus L0 is connected to the air conditioner d3 through the DC/AC converter 10. The air conditioner d3 supplies power by inverting +336V to about 220V single-phase AC through the DC/AC converter 10.
In fig. 1, #2, #3, and #13 each represent a power meter, so that the voltage, current, and power of each path can be monitored in real time.
The energy management method of the 336V direct-current high-voltage direct-current power supply system is shown in fig. 2, and comprises an energy management mode of a photovoltaic power generation module A, an alternating-current power grid B and a hybrid energy storage module C, wherein each module adopts a proper control mode, so that the voltage of a direct-current bus L0 is stable, and the stability and the reliable operation of the whole energy power supply system of the system are coordinated.
In fig. 2, a control module E is included, where the control module E includes a photovoltaic module control portion, a hybrid energy storage control portion, and a grid interface control portion. The schematic diagrams of the photovoltaic module control part, the hybrid energy storage control part and the power grid interface control part are respectively shown in fig. 3 (1), fig. 3 (2) and fig. 3 (3).
The switches S1-S3 all adopt hysteresis control to prevent each control part from being frequently switched in different modes.
The control process comprises the following steps:
the 336V direct current bus is connected with the photovoltaic power generation module A, the hybrid energy storage module C and the alternating current power grid B, and the magnitude and the transformation trend of the bus voltage can approximately reflect the energy condition of the system. If the voltage of the direct current bus L0 rises, the input energy of the system is larger than the output energy; whereas the system input energy is less than the output energy. The balance of system energy can be achieved by controlling the bus voltage.
The energy sources of the power supply system of the invention are three: an alternating current power grid B, a hybrid energy storage module C (a lithium battery and a super capacitor 4) and a photovoltaic array. Stabilization of the dc bus L0 voltage requires coordinated control of the individual power supply sections.
According to the grid-connected and island running states, the system load demands and the hybrid energy storage states of the system, the power supply system is divided into 8 working states:
working mode 1: the alternating current power grid B fails, the photovoltaic power generation module A and the storage battery 3 work simultaneously and cannot provide energy required by the load D, at the moment, the super capacitor 4 works in a constant voltage mode and provides high-frequency power required by stabilizing direct current side voltage, the direct current side voltage is stabilized rapidly, the storage battery 3 supports power, and the fluctuation of full load is borne;
working mode 2: the alternating current power grid B works normally, the photovoltaic power generation module A and the storage battery 3 run simultaneously and are insufficient to provide energy required by the load D, in the mode, the power grid interface unit converter works in a rectification mode, and the voltage of the direct current bus L0 is stabilized; the photovoltaic power generation module interface converter works in a maximum power tracking mode, the storage battery interface unit works in a boosting mode or in standby mode, and the super capacitor energy storage unit converter does not work.
Working mode 3: the alternating current power grid B works normally, the photovoltaic power generation module A and the storage battery 3 run simultaneously to meet the energy required by the load D, and at the moment, the power grid interface unit converter works in a current limiting mode or does not work; the photovoltaic power generation module interface converter works in a maximum power tracking mode, the storage battery interface unit works in a boosting mode, and the voltage of the direct current bus L0 is stabilized;
working mode 4: the photovoltaic power generation module a operates enough to supply the energy required by the load D, and the surplus energy charges the storage battery 3. In this mode, the grid interface unit converter is not operating; the photovoltaic power generation module interface converter works in a maximum power tracking mode, the storage battery interface unit works in a step-down mode, and the voltage of the direct current bus L0 is stabilized. In order to prevent the overcharge of the accumulator 3, the supercapacitor 4 is put into operation at this time;
working mode 5: the photovoltaic power generation module A is operated to provide energy required by the load D, meanwhile, the storage battery 3 is fully charged, the residual energy is fed back to the alternating current power grid B, and in the mode, the power grid interface unit converter is operated in an inversion mode to stabilize the voltage of the direct current bus L0; the photovoltaic power generation module interface converter works in an MPPT mode, and the storage battery interface unit is subjected to current limiting charging or standby;
working mode 6: the ac grid B fails and the photovoltaic power module a operates sufficiently to supply the energy required by the load D while the battery 3 is fully charged, in which mode the grid interface unit converter is not operating; the photovoltaic power generation module interface converter exits from the MPPT mode, and the voltage of the direct current bus L0 is stabilized; the storage battery interface unit and the super capacitor interface unit do not work;
working mode 7: the alternating current power grid B breaks down, the photovoltaic power generation module A does not generate enough energy required by the load D, the photovoltaic power generation module A works in an MPPT mode, and the hybrid energy storage module C works in a discharging voltage stabilizing mode.
Working mode 8: the alternating current power grid B breaks down, the photovoltaic power generation module A generates enough energy required by the load D, the photovoltaic power generation module A works in an MPPT mode, and the hybrid energy storage module C works in a charging voltage stabilizing mode.
The control circuit schematic diagram of the power grid interface unit converter is shown in fig. 4 (1), and the power grid is connected into a direct current bus L0 by a bidirectional AC/DC converter 2 after being filtered by an RLC parallel branch through a three-phase step-down transformer.
The Boost chopper circuit (Boost circuit) adopted by the control circuit schematic diagram of the photovoltaic power generation module interface converter is connected with the direct current bus L0, and the structure of the Boost circuit is shown in fig. 4 (2).
In the invention, a storage battery 3 and a super capacitor 4 are both a Buck-Boost bidirectional DC/DC converter and are composed of Boost and Buck converters, the schematic diagram of the control circuit of the hybrid energy storage unit converter is shown in fig. 4 (3), and the structure diagram is shown in fig. 4 (3) and is provided with a switch tube S 1 And S is 2 Adopts a fully-controlled insulated bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), D 1 And D 2 Freewheel diode, U dc The direct-current bus voltage is C, the output side capacitance and L, the energy storage inductance.
In addition, all install intelligent sensor and power caliber at each to power supply part, converter part and load, generating line, voltage size and power size and the flow direction that can the actual monitoring node, pass through 5G technique with data upload to the high in the clouds, be convenient for the monitoring and the management of operating personnel.
In consideration of the complexity of the system, the intelligent sensor is mainly a bus and cable temperature monitor, when the temperature is too high, the intelligent sensor transmits collected data to the intelligent terminal in a wireless mode, and after the system receives temperature data analysis, an alarm process is started and related staff are notified. The intelligent sensor model is: HIH-3602 has the function of transmitting temperature information in real time.
Claims (3)
1. High voltage direct current power supply system based on optical storage direct current micro-grid, characterized in that the system includes: the photovoltaic power generation system comprises a photovoltaic power generation module (A), an alternating current power grid (B) and a hybrid energy storage module (C);
the photovoltaic power generation module (A) is connected with a direct current bus (L0) through a first DC/DC converter (1);
the alternating current power grid (B) is connected with a direct current bus (L0) through a bidirectional AC/DC converter (2);
the hybrid energy storage module (C) comprises a storage battery (3) and a super capacitor (4), and the storage battery (3) and the super capacitor (4) are respectively connected with a direct current bus (L0) through a second DC/DC converter (5) and a third DC/DC converter (6);
the direct current bus (L0) is connected with a load (D);
the high-voltage direct current power supply system is divided into 8 working states:
working mode 1: the alternating current power grid (B) breaks down, the photovoltaic power generation module (A) and the storage battery (3) work simultaneously and cannot provide energy required by the load (D), at the moment, the super capacitor (4) works in a constant voltage mode and provides high-frequency power required by stabilizing direct current side voltage, the direct current side voltage is quickly stabilized, and the storage battery (3) supports power and bears the fluctuation of full load;
working mode 2: the alternating current power grid (B) works normally, the photovoltaic power generation module (A) and the storage battery (3) run simultaneously and are insufficient to provide energy required by the load (D), in the mode, the bidirectional AC/DC converter (2) works in a rectification mode to stabilize the voltage of the direct current bus (L0); the first DC/DC converter (1) works in a maximum power tracking mode, the second DC/DC converter (5) works in a boosting mode or is standby, and the third DC/DC converter (6) does not work;
working mode 3: the alternating current power grid (B) works normally, the photovoltaic power generation module (A) and the storage battery (3) run simultaneously and can meet the energy required by the load (D), and the bidirectional AC/DC converter (2) works in a current limiting mode or does not work at the moment; the first DC/DC converter (1) works in a maximum power tracking mode, the second DC/DC converter (5) works in a boosting mode, and the voltage of the direct current bus (L0) is stabilized;
working mode 4: the photovoltaic power generation module (A) is operated to provide energy required by the load (D), and the redundant energy charges the storage battery (3); in this mode, the bi-directional AC/DC converter (2) is not operated; the first DC/DC converter (1) works in a maximum power tracking mode, the second DC/DC converter (5) works in a step-down mode, and the voltage of the direct current bus (L0) is stabilized; in order to prevent the phenomenon of overcharging of the storage battery (3), the super capacitor (4) is put into operation at the moment;
working mode 5: the photovoltaic power generation module (A) is operated to provide energy required by the load (D), meanwhile, the storage battery (3) is fully charged, and the residual energy is fed back to the alternating current power grid (B), and in the mode, the bidirectional AC/DC converter (2) is operated in an inversion mode to stabilize the voltage of the direct current bus (L0); the first DC/DC converter (1) works in an MPPT mode, and the second DC/DC converter (5) is in current-limiting charging or standby;
working mode 6: the alternating current network (B) fails, the photovoltaic power generation module (A) operates sufficiently to provide the energy required by the load (D), while the accumulator (3) is fully charged, in which mode the bidirectional AC/DC converter (2) does not operate; the first DC/DC converter (1) exits from the MPPT mode to stabilize the voltage of the direct current bus (L0); the second DC/DC converter (5) and the third DC/DC converter (6) do not work;
working mode 7: the alternating current power grid (B) fails, the photovoltaic power generation module (A) is insufficient in power generation to provide energy required by the load (D), the photovoltaic power generation module (A) works in an MPPT mode, and the hybrid energy storage module (C) works in discharge voltage stabilization;
working mode 8: the alternating current power grid (B) breaks down, the photovoltaic power generation module (A) generates enough energy required by the load (D), the photovoltaic power generation module (A) works in an MPPT mode, and the hybrid energy storage module (C) works in charging voltage stabilization.
2. The high-voltage direct current power supply system based on the optical storage direct current micro-grid according to claim 1, wherein: the photovoltaic power generation module (A) comprises a plurality of photovoltaic power generation units (a), the photovoltaic power generation units (a) form a photovoltaic array in parallel, and the photovoltaic array is connected into a 336V direct current bus through a boost DC/DC converter.
3. The high-voltage direct current power supply system based on the optical storage direct current micro-grid according to claim 1, wherein: the load (D) comprises a CPU, a hard disk (D1), a fan (D2) and an air conditioner (D3);
the direct current bus (L0) is connected with the CPU through a fourth DC/DC converter (7);
the direct current bus (L0) is connected with the hard disk (d 1) through a fifth DC/DC converter (8);
the direct current bus (L0) is connected with a fan (d 2) through a sixth DC/DC converter (9);
the direct current bus (L0) is connected with an air conditioner (d 3) through a DC/AC converter (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111425399.4A CN114221369B (en) | 2021-11-26 | 2021-11-26 | High-voltage direct-current power supply system based on optical storage direct-current micro-grid and energy management method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111425399.4A CN114221369B (en) | 2021-11-26 | 2021-11-26 | High-voltage direct-current power supply system based on optical storage direct-current micro-grid and energy management method thereof |
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| Publication Number | Publication Date |
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| CN114221369A CN114221369A (en) | 2022-03-22 |
| CN114221369B true CN114221369B (en) | 2023-08-25 |
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