CN111244961A - High-efficiency power supply system and method - Google Patents
High-efficiency power supply system and method Download PDFInfo
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- CN111244961A CN111244961A CN202010142177.0A CN202010142177A CN111244961A CN 111244961 A CN111244961 A CN 111244961A CN 202010142177 A CN202010142177 A CN 202010142177A CN 111244961 A CN111244961 A CN 111244961A
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention provides a high-efficiency power supply system and a method, wherein the high-efficiency power supply system comprises a power transformer, a first voltage-regulating circuit, a second voltage-regulating circuit and a first voltage-regulating circuit, wherein the power transformer receives power input of a power grid and performs isolation voltage reduction on the power grid; and the AC/DC converter converts the alternating current provided by the first output winding into high-voltage direct current to realize high-voltage direct current power supply. Therefore, the invention realizes the simultaneous acquisition of high-voltage direct-current power supply and auxiliary alternating-current power supply from a high-voltage alternating-current power grid, improves the conversion efficiency from the power grid side to the high-voltage direct-current bus, and can also provide backup power supply guarantee for alternating-current power utilization equipment of a machine room. Therefore, the primary power supply is more efficient, concise and reliable.
Description
Technical Field
The invention relates to the technical field of cosmetic tools, in particular to a high-efficiency power supply system.
Background
Large electronic devices, such as large communication devices, large data storage devices, supercomputers, and the like, generally adopt a centralized power supply mode of a high-voltage direct current bus, that is, a primary power supply system converts power-frequency alternating current provided by a power grid into stable and controllable high-voltage direct current, and then the high-voltage direct current is introduced into a device room through a direct current bus to realize distributed power supply. The primary power supply system not only provides a rectification function of converting alternating current into direct current, but also provides a backup power supply function under the condition of power grid interruption, a backup battery with certain capacity is hung on a direct current bus, the primary power supply maintains a floating charge state for the backup battery under the normal condition, and the backup battery provides power for the direct current bus under the condition of alternating current input interruption, so that continuous power supply of equipment in a machine room is ensured.
At present, the 240VDC high-voltage direct current bus standard established by China telecom and the 336VDC high-voltage direct current bus standard established by China Mobile take batteries with nominal voltages of 240V and 336V as backup batteries respectively, and a primary power supply system also provides a charging management function for the backup batteries. The input of the primary power source is typically 380VAC three-phase ac power provided by the room. Considering the safety isolation problem of a high-voltage direct-current bus and other electric equipment in a machine room, a primary power supply is usually an isolated AC/DC power supply converter and generally comprises an isolated DC/DC converter and a preposed Power Factor Corrector (PFC), and considering the reliability and the flexibility of expansion of a primary power supply system, the primary power supply is usually made into a module power supply of several kW to dozens of kW, and then provides output power of dozens to hundreds of kW in a parallel connection mode.
With the increase of the electric power consumption of electronic equipment, especially for a newly-built large-scale data center, the electric power consumption of the equipment reaches the magnitude of MW (1000kW) or even tens of MW, the electric charge becomes the main operation cost of the data center, and people pay more and more attention to the efficiency of the power converter. At present, 380VAC is usually obtained by a 10kVAC alternating current power grid through voltage reduction of a power transformer, the conversion efficiency of the stage is about 99%, the 380VAC is converted into 240/336VDC through isolation AC/DC, the efficiency of the stage is about 95-96%, therefore, the efficiency of the whole primary power supply is about 94-95%, and the power loss on a primary power supply system is about 5-6%.
In addition to the dc power utilization devices, the data center equipment room also needs some auxiliary electrical devices, such as air conditioners, fans, etc., which need ac power supply. In order to ensure the reliability of power supply, the machine room is generally required to be equipped with a UPS with a certain capacity, and 380VAC alternating current is provided for the auxiliary electric equipment through the UPS when the power supply of a power grid is interrupted; or an inverter is added in the power supply system, the direct current of the backup battery is converted into the alternating current of 380VAC, and the auxiliary devices are switched to the output of the inverter when the power of the power grid is interrupted, so that the power supply of the equipment is guaranteed. How to integrate the power supply of these auxiliary devices of the machine room is also a very valuable topic.
It can be seen that the primary power supply system in the prior art needs to be improved in terms of efficiency and structural complexity.
Disclosure of Invention
It is an object of the present invention to provide a high efficiency power supply system that can simultaneously obtain high voltage dc power supply and auxiliary ac power supply directly from a high voltage ac power grid.
One object of the present invention is to provide a high efficiency power supply system that improves the efficiency of conversion from the grid side to the high voltage dc bus.
According to a first aspect of the present invention, there is provided a high efficiency power supply system for obtaining both a high voltage dc power supply and an auxiliary ac power supply from a high voltage ac power grid, comprising:
the power transformer receives power input of a power grid and performs isolation voltage reduction on the power grid, and at least comprises a first output winding and a second output winding, wherein the first output winding provides power for a rear-stage high-voltage direct-current bus, and the second output winding provides auxiliary alternating-current power supply; and
and the AC/DC converter converts the alternating current provided by the first output winding into high-voltage direct current to realize high-voltage direct current power supply.
Optionally, for the high efficiency power supply system, the AC/DC converter is bidirectional in nature; the high efficiency power supply system further comprises:
the voltage of the backup battery is matched with the high-voltage direct current and is directly connected with the high-voltage direct current bus in parallel; and
and the control unit is used for detecting the voltage of the power grid, providing a signal for the AC/DC converter when the power of the power grid is interrupted, enabling the AC/DC converter to enter a DC-to-AC working mode, so that the power of the backup battery is transmitted to the power transformer, and further providing auxiliary alternating current power supply through a second output winding of the power transformer.
Optionally, for the high efficiency power supply system, the AC/DC converter is a non-isolated type.
Optionally, the nominal voltage of the high-voltage direct current bus is 240V or 336V.
Optionally, the input voltage of the non-isolated AC/DC converter is matched to the bus voltage of the high voltage DC.
Optionally, for the high-efficiency power supply system, the AC/DC converter includes a plurality of conversion units, inputs and outputs of the plurality of conversion units are respectively connected in parallel, and the AC/DC converter operates in a parallel current-sharing state, so as to achieve a high-reliability system structure with redundant backup.
Optionally, for the high efficiency power supply system, the AC/DC converter includes a six-switch PFC rectifier circuit.
Optionally, for the high efficiency power supply system, the AC/DC converter includes a three-phase three-level PFC rectifier circuit.
Optionally, for the high efficiency power supply system, the withstand voltage of the power device in the AC/DC converter is equal to or lower than 650V.
Optionally, for the high-efficiency power supply system, the iron core of the power transformer is in a shape of a transverse "ri", the input winding is U, V, W three phases, and the input winding, the first output winding and the second output winding are respectively wound on three columns of the iron core; insulating layers are arranged between the first output winding and the input winding and between the second output winding and the first output winding to provide insulating distances.
Optionally, for the high efficiency power supply system, the nominal voltage of the first output winding is 240Vrms, and the nominal voltage of the second output winding is 380 Vrms.
According to a second aspect of the present invention, there is provided a high efficiency power supply obtaining method, comprising:
obtaining a first set of three-phase alternating current and a second set of three-phase alternating current which are mutually isolated from a high-voltage power grid by using a power transformer, wherein the second set of three alternating currents provides an auxiliary alternating current power supply; and
the first group of three-phase alternating current obtains high-voltage direct current through the AC/DC converter, and high-voltage direct current power supply is achieved.
Optionally, for the high efficiency power obtaining method, the peak value of the line voltage of the first group of three-phase alternating current is matched with the maximum value of the high voltage direct current.
Optionally, for the high-efficiency power supply obtaining method, a backup battery is connected in parallel to an output of the AC/DC converter, and when the power grid is interrupted, the backup battery supplies power to the high-voltage DC bus, and supplies power to the power transformer through the AC/DC converter, so as to maintain output of the second group of three-phase alternating currents.
Compared with the prior art, the invention provides a high-efficiency power supply system which comprises a power transformer, a first output winding and a second output winding, wherein the power transformer receives power input of a power grid and performs isolation voltage reduction on the power grid; and the AC/DC converter converts the alternating current provided by the first output winding into high-voltage direct current to realize high-voltage direct current power supply. Therefore, the invention realizes the simultaneous acquisition of high-voltage direct-current power supply and auxiliary alternating-current power supply from a high-voltage alternating-current power grid, and improves the conversion efficiency from the power grid side to the high-voltage direct-current bus; furthermore, the invention can also provide backup power supply guarantee for the alternating current electric equipment in the machine room. Therefore, the primary power supply is more efficient, concise and reliable.
Drawings
FIG. 1 is a block diagram of a high efficiency power system according to an embodiment of the present invention;
FIG. 2 is a schematic winding diagram of a three-phase power transformer according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a non-isolated AC/DC converter in accordance with an embodiment of the present invention;
FIG. 4 is a further circuit diagram of a non-isolated AC/DC converter in accordance with an embodiment of the present invention;
FIG. 5 is a control circuit diagram of a non-isolated AC/DC converter in accordance with an embodiment of the present invention;
FIG. 6 is a waveform of the input and output of a non-isolated AC/DC converter according to an embodiment of the present invention;
FIG. 7 is another circuit diagram of a non-isolated AC/DC converter in accordance with an embodiment of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
After long-term research, the inventor of the present invention found that, as in the prior art described in the background art, the efficiency can be further improved, and a single UPS requires additional cost, occupies a large space, and has a complex and decentralized structure. Therefore, the high-efficiency power supply system applicable to the high-voltage power grid (10kV three-phase alternating current, also called medium-voltage power grid in some technical fields) directly intervening in the data center machine room is provided, the system can directly convert the 10kV three-phase alternating current into stable and controllable direct voltage (such as 240VDC or 336VDC), and simultaneously provides 380V three-phase alternating current which is electrically isolated from each other, and the whole power supply system is high-efficiency, simple and reliable.
Referring to fig. 1, fig. 1 is a block diagram of a circuit structure of a high efficiency power system according to an embodiment of the invention. The high efficiency power supply system includes a power transformer T and an AC/DC converter.
The high-voltage grid input HVin is, for example, a 10kV three-phase alternating current, which is stepped down by a power transformer T into two sets of low-voltage three-phase alternating currents: the first output winding N1 is a main output winding and provides power for a high-voltage direct-current bus at a later stage, and the voltage setting of the first output winding N1 may be determined according to the voltage of the high-voltage direct-current bus HDCout, so that the efficiency of the non-isolated AC/DC converter is better or even optimal, for example, the peak value of the line voltage of the first group of three-phase alternating currents of the first output winding N1 may be matched with the maximum value of the high-voltage direct-current voltage, so as to achieve the optimal efficiency of the AC/DC converter. The second output winding N2 is an auxiliary winding for supplying power to ac consumers in the machine room, for example, the voltage of the second output winding N2 is set to 380V.
In one embodiment of the present invention, the high efficiency power supply system further comprises:
the voltage of the backup battery is matched with the high-voltage direct current and is directly connected with the high-voltage direct current bus in parallel; for example, a backup battery E is connected in parallel directly to the AC/DC output, and in the event of a grid outage, power is provided by the backup battery E to the devices on the high voltage DC bus.
Further, the AC/DC converter is of a bidirectional nature; the bidirectional AC/DC converter has a control port through which the converter can be operated in either AC to DC or DC to AC mode.
The high efficiency power supply system further comprises: and the control unit is used for detecting the voltage of the power grid, providing a signal for the AC/DC converter when the power of the power grid is interrupted, enabling the AC/DC converter to enter a DC-to-AC working mode, so that the power of the backup battery is transmitted to the power transformer, and further providing auxiliary alternating current power supply through a second output winding of the power transformer.
In one embodiment of the invention, the AC/DC converter may be non-isolated.
In a conventional power supply scheme, 10kV three-phase alternating current is stepped down to 380V three-phase alternating current through a power transformer, and in order to isolate a backup battery from other electric devices, AC/DC for converting the 380V three-phase alternating current into 240/336VDC must be isolated, so that the efficiency of the whole system is limited by the isolated AC/DC. The non-isolated AC/DC circuit is simpler than the isolated AC/DC circuit, and the efficiency is higher than that of the isolated AC/DC circuit. The function of isolation in the power supply system of fig. 1 is performed by a power transformer. The main winding for charging the backup battery and the auxiliary winding for supplying power to the equipment in the machine room are isolated from each other in the power transformer, and meanwhile, the two windings are kept at a sufficient isolation distance from the input winding, so that an isolation voltage of at least 10kV is realized.
Fig. 2 is a winding layout diagram of a power transformer according to an embodiment of the invention. The iron core of the power transformer is a transverse 'Ri' -shaped silicon steel sheet iron core 10, the input windings are three phases of U, V and W, the three windings are respectively wound on three columns of the silicon steel sheet iron core, the three windings adopt a triangular connection method, and three end points are respectively connected with the three phases of U, V and W of a high-voltage power grid; the three-phase output of the first output winding N1 is A, B and C, the three-phase output of the second output winding N2 is a, B and C, the connection mode of the output windings can be a triangle connection method or a star connection method, and when the output of the auxiliary winding needs a zero line, the star connection method is adopted. The insulation layer 11 provides enough insulation distance between the first output winding N1 and the input winding N0 so as to meet the requirement of the isolation voltage of more than 10 kV; an insulating layer 11 is also arranged between the second output winding N2 and the first output winding N1 to provide a sufficient insulating distance, and the insulating voltage of the insulating layer 11 can be 1kV, 3kV or other voltage values according to different use requirements.
The design of the non-isolated AC/DC converter mainly aims at improving efficiency, and the topology adopted in the embodiment of the invention is PFC rectification with six switches and Buck type DC/DC. Fig. 3 is a circuit diagram of a non-isolated AC/DC circuit according to an embodiment of the present invention, where S1, S2, S3, S4, S5, and S6 form a PFC rectifier circuit with three legs, one end of each of three inductors LA, LB, and LC is connected to a midpoint of the three legs, and the other end of each inductor is connected to three-phase voltages a, B, and C provided by the first output winding N1. Three-phase alternating current passes through three inductors LA, LB and LC and a six-switch PFC rectifying circuit to obtain a direct-current voltage Vbus on a capacitor Cbus; the DC voltage Vbus passes through a Buck DC/DC circuit composed of S7, D1, and Lo, and an output voltage Vo is obtained at an output capacitor Co.
S1-S6 are IGBT power switches with a reverse diode, or MOSFET power switches of SiC material, etc., and it is worth mentioning that ordinary Si-based MOSFET power switches are not suggested here because the reverse recovery loss of the reverse diode is large. The S7 can be Si-based MOSFET or IGBT with low conduction loss, and the D1 can be Si-based fast recovery diode or Schottky diode made of SiC material, so that the efficiency of the converter is optimized.
Since the six-switch PFC rectifying circuit naturally has the characteristic of bidirectional operation, in order to enable the whole AC/DC converter to have the function of bidirectional conversion, only D1 in FIG. 3 needs to be replaced by an active switch S8, and the whole circuit is as shown in FIG. 4. When the circuit works in the forward direction, three-phase alternating current is converted into controllable direct current voltage Vo, and an input power factor close to 1 is realized; when the circuit works reversely, the direct-current voltage Vo is boosted to Vbus, and then three-phase sinusoidal alternating current is obtained through the three-phase inverter bridge.
Fig. 5 is a control block diagram of a non-isolated AC/DC converter according to an embodiment of the present invention, and a DSP with sufficient strength can be used to implement real-time control of each switch, for example, the 32-bit DSP chip F28035 of TI corporation can meet the control requirements. Utilize the simulation input port of DSP, acquire three phase voltage signal VA, VB, VC and three phase current signal IA, IB, the real-time voltage value of IC and Vbus, DSP obtains six way PWM signals of S1-S6 through real-time operation, apply six power switch through drive circuit 1, realize VA, VB, VC toward Vbus' S boost function, three phase current IA is regulated and control simultaneously, IB, IC follows three phase voltage VA respectively, VB, VC and presents sinusoidal waveform, thereby reach the input power factor that is close to 1. Buck type DC/DC is as independent change unit, also can realize by same DSP, and DSP needs to gather output voltage signal Vo, output current signal Io, combines the real-time signal of Vbus again, gives appropriate PWM signal, applies to S7 and S8 through drive circuit 2, realizes Vbus to Vo' S step-down function. The DSP also has a digital input port for receiving control signals from the system to determine whether the converter is operating in forward or reverse direction.
FIG. 6 shows input and output waveforms of a non-isolated AC/DC converter according to an embodiment of the present invention.
A detailed analysis is given below:
the efficiency of a non-isolated AC/DC converter depends largely on the three-phase input voltage, the PFC bus Vbus and the output voltage Vo. Generally, the closer the voltage of Vbus is to the peak of the three-phase input line Voltage (VAB), the higher the efficiency of the PFC rectifier stage; the closer Vo is to Vbus, the higher the Buck voltage reduction efficiency is, and the following relation is satisfied in the invention:
Vbus＝(1.1～1.3)*VAB (Peak)(1)
The Buck type voltage reduction circuit has the following input and output relations:
Vo＝Vbus*D (2)
wherein D is the duty cycle of the Buck converter, and the maximum value of D can be 0.95, the maximum values Vo _ max and Vbus of the output voltage should satisfy the following relationship:
Vo_max＝0.95*Vbus (3)
for a 336V system moving in china, a typical value for the output voltage Vo is 336V, assuming that battery charge management requires a voltage range of + -15%, the maximum value of Vo is:
Vo_max＝336*1.15＝386V (4)
the optimum value of Vbus is 407V according to the relation (3), and V is obtained according to the relation (1)AB (Peak)Is 370V, then
VAB (effective value)＝370*0.707＝262Vrms (5)
Considering that the grid voltage has a certain variation range, 240Vrms is taken as a typical value designed by VAB, so that the turn ratio of the power transformer can be obtained:
input winding turns: the number of turns of the first output winding is 10000: 41.7: 1
Input winding turns: the number of turns of the second output winding is 10000: 380 ═ 26.3: 1
Under the condition that the non-isolated AC/DC converter is input at 240Vrms, the voltage stress of all power devices is less than 407V, therefore 650V or 600V power devices with excellent performance can be used, and if 380Vrms is directly adopted as the input of the converter, a device with a higher gear of 900V or 1200V needs to be selected. Due to the non-isolated variable topology and the low-voltage-resistant power device, the efficiency of the converter can reach more than 98%. Compared with the traditional scheme, the output voltage of the power transformer is 380Vrms, the voltage is reduced from 380Vrms to 240Vrms, the current of the winding is correspondingly increased under the condition of the same power, the number of turns of the output winding is reduced, the winding loss can be reduced by increasing the sectional area of the output winding, and the efficiency of the power transformer can still reach more than 99% on the premise of the same copper consumption, so that the efficiency of the primary power supply can reach more than 97% and is 2-3% higher than that of the traditional scheme, and the loss of the whole primary power supply is reduced by about one half.
The non-isolated AC/DC converter can also adopt other PFC rectification topologies, for example, a three-phase three-level PFC topology in an embodiment of the invention shown in FIG. 7, the voltage stress of the switching devices S1, S2 and S3 in the circuit structure is lower, the circuit is suitable for application with higher output voltage, such as Vo-600V, the circuit has more advantages than a six-switch circuit, and the direct current output of 600-700V can be realized by adopting 650V devices, so that the purpose of improving the efficiency is achieved.
For a power supply system of hundreds of kW, the non-isolated AC/DC converter can be designed into a single high-power converter so as to reduce the hardware cost; the system can also be designed into a mode of connecting a plurality of modules in parallel, in the mode of connecting the plurality of modules in parallel, each module works independently, output power is equally divided among the modules through a current-sharing bus or a data communication bus, redundant backup among the modules is realized, and the reliability of the system is improved. Compared with the traditional isolated AC/DC, the non-isolated AC/DC has higher efficiency, higher power density and simpler circuit structure, thereby having higher reliability.
By adopting the bidirectional working non-isolated AC/DC, under the condition of power grid interruption, the inversion of the electric power of the backup battery to auxiliary output can be realized, the UPS of auxiliary equipment of a data center machine room can be omitted, the reliable operation of the machine room is ensured, and a power supply system is simpler and more reliable. Under the structure of bidirectional transformation, the inversion of the electric power of a backup battery to an input power grid can be further realized, and the backup battery of the data center can be used as an energy storage link for peak clipping and valley filling of the power grid, so that the added value of a power supply system of the data center is developed.
In summary, the present invention provides a high efficiency power supply system, which includes a power transformer for receiving power input from a power grid and performing isolated voltage reduction on the power grid, wherein the power transformer at least includes a first output winding and a second output winding, the first output winding provides power for a rear-stage high voltage dc bus, and the second output winding provides auxiliary ac power; and the AC/DC converter converts the alternating current provided by the first output winding into high-voltage direct current to realize high-voltage direct current power supply. Therefore, the invention realizes the simultaneous acquisition of high-voltage direct-current power supply and auxiliary alternating-current power supply from a high-voltage alternating-current power grid, and improves the conversion efficiency from the power grid side to the high-voltage direct-current bus; furthermore, the invention can also provide backup power supply guarantee for the alternating current electric equipment in the machine room. Therefore, the primary power supply is more efficient, concise and reliable.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A high efficiency power supply system that obtains both a high voltage dc supply and an auxiliary ac supply from a high voltage ac power grid, comprising:
the power transformer receives power input of a power grid and performs isolation voltage reduction on the power grid, and at least comprises a first output winding and a second output winding, wherein the first output winding provides power for a rear-stage high-voltage direct-current bus, and the second output winding provides auxiliary alternating-current power supply; and
and the AC/DC converter converts the alternating current provided by the first output winding into high-voltage direct current to realize high-voltage direct current power supply.
2. The high efficiency power supply system of claim 1 wherein said AC/DC converter is bi-directional in nature; the high efficiency power supply system further comprises:
the voltage of the backup battery is matched with the high-voltage direct current and is directly connected with the high-voltage direct current bus in parallel; and
and the control unit is used for detecting the voltage of the power grid, providing a signal for the AC/DC converter when the power of the power grid is interrupted, enabling the AC/DC converter to enter a DC-to-AC working mode, so that the power of the backup battery is transmitted to the power transformer, and further providing auxiliary alternating current power supply through a second output winding of the power transformer.
3. A high efficiency power supply system as claimed in claim 1 or 2, wherein said AC/DC converter is non-isolated; preferably, the nominal voltage of the high-voltage direct current bus is 240V or 336V, and further preferably, the input voltage of the non-isolated AC/DC converter is matched with the bus voltage of the high-voltage direct current.
4. The high efficiency power system of claim 3 wherein the AC/DC converter comprises a plurality of conversion units, the input and output of the conversion units are connected in parallel respectively, and the converter operates in parallel current sharing mode to achieve a redundant and backup high reliability system architecture.
5. The high efficiency power supply system of claim 3 wherein the AC/DC converter comprises a six-switch PFC rectifier circuit or wherein the AC/DC converter comprises a three-phase three-level PFC rectifier circuit; preferably, the withstand voltage of the power device in the AC/DC converter is equal to or lower than 650V.
6. The high efficiency power supply system of claim 1 wherein the core of the power transformer is in a transverse "ri" shape, the input winding is U, V, W three phases, and the input winding, the first output winding and the second output winding are wound around three legs of the core respectively; insulating layers are arranged between the first output winding and the input winding and between the second output winding and the first output winding to provide insulating distances.
7. The high efficiency power supply system of claim 6 wherein the nominal voltage of the first output winding is 240Vrms and the nominal voltage of the second output winding is 380 Vrms.
8. A high efficiency power harvesting method, comprising:
obtaining a first set of three-phase alternating current and a second set of three-phase alternating current which are mutually isolated from a high-voltage power grid by using a power transformer, wherein the second set of three alternating currents provides an auxiliary alternating current power supply; and
the first group of three-phase alternating current obtains high-voltage direct current through the AC/DC converter, and high-voltage direct current power supply is achieved.
9. The method of claim 8, wherein the peak line voltage of the first set of three-phase alternating current is matched to the maximum value of the hvdc.
10. The method of claim 8, wherein a backup battery is connected in parallel to the output of the AC/DC converter, and when the grid is interrupted, the backup battery supplies power to the high voltage DC bus and the power transformer is reversed by the AC/DC converter to maintain the output of the second set of three-phase AC power.
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