CN109149755A - Using the double transform uninterruptible power systems of the high frequency of flywheel energy storage and control method - Google Patents
Using the double transform uninterruptible power systems of the high frequency of flywheel energy storage and control method Download PDFInfo
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- CN109149755A CN109149755A CN201810992511.4A CN201810992511A CN109149755A CN 109149755 A CN109149755 A CN 109149755A CN 201810992511 A CN201810992511 A CN 201810992511A CN 109149755 A CN109149755 A CN 109149755A
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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
-
- 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
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The present invention relates to uninterruptible power supply technical fields, more particularly to a kind of double transform uninterruptible power systems of high frequency using flywheel energy storage and control method, which includes set on the double―transformed UPS high-frequency device between ac input end and ac output end and the energy accumulation device for fly wheel connecting with double―transformed UPS high-frequency device.The double transform uninterruptible power systems of high frequency using flywheel energy storage of the invention, energy accumulation device for fly wheel includes DC-AC reversible transducer and flywheel energy storage unit, no setting is required in double―transformed UPS high-frequency device DC-DC converter, increase the efficiency of double―transformed UPS high-frequency device, double―transformed UPS high-frequency device cost is reduced simultaneously, reduce the volume of double―transformed UPS high-frequency device, nothing is write to each other between double―transformed UPS high-frequency device and energy accumulation device for fly wheel, simplify system wiring, reduce the dependence between equipment, enhance the compatibility of system.
Description
Technical field
The present invention relates to uninterruptible power supply technical fields, and in particular to a kind of double transforms of the high frequency using flywheel energy storage are not
Uninterruptible power system and control method.
Background technique
Current most widely used UPS is online double―transformed UPS, and online double―transformed UPS can usually be divided into power frequency again
Machine and High-frequency machine two types.Power frequency machine, which is usually boosted by controllable silicon SCR rectifier, IGBT inverter, bypass and power frequency, is isolated
Transformer composition.Because its rectifier and transformer working frequency are power frequency 50Hz, therefore referred to as power frequency UPS.High-frequency machine is usual
It is made of IGBT hf rectifier, battery converter, IGBT inverter and bypass.IGBT can be added in its gate pole by control
Driving to control opening and turning off for IGBT, IGBT rectifier switch frequency usually in several kHz to tens kHz, even as high as on
Hundred kHz, relative to 50Hz power frequency, referred to as high frequency UPS.
Online double―transformed UPS is commonly provided with lead-acid accumulator, for providing backup in alternating current power loss.Power frequency
UPS is by the way of step-down rectifier, and typical busbar voltage is usually between 300V~500V, and lead-acid batteries can be direct
DC bus is hung over, does not need in addition to increase battery converter to carry out voltage conversion.High frequency UPS rectification is using boosting rectification mould
Formula, the voltage for exporting DC bus is higher than the peak-to-peak value of input AC line voltage, and general representative value is 700V~800V or so.
If lead-acid batteries are directly articulated on bus, required concatenated battery number is too many, has exceeded lead-acid accumulator institute
Allow the limitation of serial number.Therefore a two-way DC/DC battery converter can be separately configured in general high frequency UPS, be used for direct current
Voltage conversion between bus and battery, will be in DC voltage conversion to the suitable range of lead-acid battery group.High frequency UPS is come
It says, in order to adapt to lead-acid accumulator, a kind of typical configuration is had become using two-way DC/DC battery converter.
Since energy accumulation device for fly wheel carries DC/AC bidirectional converter, DC flanks adjustable into voltage range, can expire completely
The DC bus-bar voltage variation range of sufficient high frequency UPS device, therefore, for the high frequency double―transformed UPS using flywheel energy storage come
It says, if following traditional design method, increases a DC/DC transform part, not only reduce the efficiency of ups system, and
The cost and volume for increasing UPS equipment increase the complexity of system control.
In consideration of it, overcoming the above defect in the prior art, a kind of double transformation of the new high frequency using flywheel energy storage are provided
Formula uninterruptible power system becomes this field technical problem urgently to be resolved.
Summary of the invention
It is an object of the invention in view of the above drawbacks of the prior art, provide, a kind of high frequency using flywheel energy storage is double to be become
Change formula uninterruptible power system and control method.
First aspect present invention provides a kind of double transform uninterruptible power systems of the high frequency using flywheel energy storage, this is
System includes:
Double―transformed UPS high-frequency device between ac input end and ac output end, the double―transformed UPS are high
Frequency device includes: ac-to-dc rectifier and the DC-AC inverter that connect with the ac-to-dc rectifier；
It is coupled in the flywheel storage of the DC bus between the ac-to-dc rectifier and the DC-AC inverter
Can device, the energy accumulation device for fly wheel include: DC-AC reversible transducer connect with the DC bus, with it is described directly
The flywheel energy storage unit of stream-alternating-current bidirectional converter connection and with the DC-AC reversible transducer and the flywheel energy storage
The flywheel controller that unit is all connected with, the flywheel controller are used for the input voltage according to the energy accumulation device for fly wheel input terminal
Control the operating status of the energy accumulation device for fly wheel.
Preferably, the flywheel controller is configured as executing following steps:
The input voltage of the continual monitoring energy accumulation device for fly wheel input terminal；
When the input voltage is greater than or equal to first voltage threshold value, charge to the energy accumulation device for fly wheel；With
And
When the input voltage is less than or equal to second voltage threshold value, control energy accumulation device for fly wheel discharges.
Preferably, the flywheel energy storage unit includes:
For storing the flywheel body of energy；
The motor being connect with the flywheel body.
Preferably, the flywheel controller is configured as executing following steps:
The input voltage of the continual monitoring energy accumulation device for fly wheel input terminal；
When the input voltage is greater than or equal to first voltage threshold value, the DC-AC reversible transducer is controlled
Power flow direction is that exchange side is flowed to by DC side, and control electrical machine working mode is electric motor mode, and driving flywheel body rotation will
Electric energy is converted to kinetic energy；
When the input voltage is less than or equal to second voltage threshold value, the DC-AC reversible transducer is controlled
Power flow direction is from exchange effluent to DC side, and control electrical machine working mode is generator mode, the inertial drive of flywheel body
Generator amature rotation, converts kinetic energy into electric energy；
When the input voltage is greater than second voltage threshold value and is less than first voltage threshold value, the DC-AC is controlled
Reversible transducer stops power conversion, and control energy accumulation device for fly wheel enters standby mode.
Preferably, the double―transformed UPS high-frequency device further include set on the DC bus and energy accumulation device for fly wheel it
Between the first dc switch and UPS controller, the UPS controller be configured as execute following steps: continual monitoring
The input voltage of the energy accumulation device for fly wheel input terminal；And when the input voltage is greater than or equal to upper limit voltage threshold value,
It controls first dc switch to disconnect, so that the double―transformed UPS high-frequency device and the energy accumulation device for fly wheel decouple；
And/or
The energy accumulation device for fly wheel further include set on DC-AC reversible transducer and double―transformed UPS high-frequency device it
Between the second dc switch；And/or
The double―transformed UPS high-frequency device further includes other set on the static state between ac input end and ac output end
Road.
Second aspect of the present invention provides a kind of double transform uninterruptible power supply systems of the above-mentioned high frequency using flywheel energy storage
The control method of system, the control method include the following steps:
The input voltage of the continual monitoring energy accumulation device for fly wheel input terminal；
When the input voltage is greater than or equal to first voltage threshold value, charge to the energy accumulation device for fly wheel；With
And
When the input voltage is less than or equal to second voltage threshold value, control energy accumulation device for fly wheel discharges.
Preferably, described " when the input voltage be greater than or equal to first voltage threshold value when, to the energy accumulation device for fly wheel
Charge " the step of include:
When the input voltage is greater than or equal to first voltage threshold value, the DC-AC reversible transducer is controlled
Power flow direction is that exchange side is flowed to by DC side, and control electrical machine working mode is electric motor mode, and driving flywheel body rotation will
Electric energy is converted to kinetic energy.
Preferably, described " when the input voltage be less than or equal to second voltage threshold value when, control energy accumulation device for fly wheel into
Row electric discharge " the step of include:
When the input voltage is less than or equal to second voltage threshold value, the DC-AC reversible transducer is controlled
Power flow direction is from exchange effluent to DC side, and control electrical machine working mode is generator mode, the inertial drive of flywheel body
Generator amature rotation, converts kinetic energy into electric energy.
Preferably, the control method further include:
When the input voltage is greater than or equal to first voltage threshold value and when the flywheel body reaches maximum speed, control
The output power for making the DC-AC reversible transducer is power needed for maintaining the maximum speed of the flywheel body；With/
Or
When the input voltage is less than or equal to second voltage threshold value, the output power of the energy accumulation device for fly wheel is controlled
To maintain the output voltage of the energy accumulation device for fly wheel as second voltage threshold value；And/or
When the input voltage is greater than second voltage threshold value and is less than first voltage threshold value, the DC-AC is controlled
Reversible transducer stops power conversion, and control energy accumulation device for fly wheel enters standby mode.
Preferably, the control method further include:
When the input voltage be greater than or equal to upper limit voltage threshold value when, control the double―transformed UPS high-frequency device with
The energy accumulation device for fly wheel decoupling.
The double transform uninterruptible power systems of high frequency using flywheel energy storage of the invention, energy accumulation device for fly wheel include straight
Stream-alternating-current bidirectional converter and flywheel energy storage unit, no setting is required in double―transformed UPS high-frequency device DC-dc conversion
Device, increases the efficiency of double―transformed UPS high-frequency device, at the same reduce double―transformed UPS high-frequency device cost, reduce it is double
The volume of transform UPS high-frequency device simplifies without writing to each other between double―transformed UPS high-frequency device and energy accumulation device for fly wheel
System wiring, reduces the dependence between equipment, enhances the compatibility of system；In addition, collection inside energy accumulation device for fly wheel
At flywheel controller, is adjusted between charged state and discharge condition according to the input voltage of its input terminal, simplify system
The complexity of control, and it is based on above-mentioned regulative mode, it can according to need the quantity for increasing energy accumulation device for fly wheel, system has
Good scalability.
Detailed description of the invention
Fig. 1 is the structural frames of the double transform uninterruptible power systems of the high frequency using flywheel energy storage of the embodiment of the present invention
Figure.
Fig. 2 is the structural representation of the double transform uninterruptible power systems of the high frequency using flywheel energy storage of the embodiment of the present invention
Figure.
Fig. 3 is the flow chart of the control method of the embodiment of the present invention.
Fig. 4 is the flow chart of the preferred embodiment of the control method of the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawing and specific implementation
Invention is further described in detail for example.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
In order to keep the narration of this disclosure more detailed with it is complete, below for embodiments of the present invention and specific real
It applies example and proposes illustrative description；But this not implements or uses the unique forms of the specific embodiment of the invention.Embodiment
In cover multiple specific embodiments feature and to construction with operate these specific embodiments method and step it is suitable with it
Sequence.However, can also reach identical or impartial function and sequence of steps using other specific embodiments.
It please refers to shown in Fig. 1 and Fig. 2, the double transform uninterruptible power supplies of the high frequency using flywheel energy storage of the embodiment of the present invention
System 130 is set between ac input end 130a and ac output end 130b, ac input end 130a and three-phase alternating-current supply
110 connections, for example, the three-phase alternating-current supply 110 may include alternating current and/or backup power source, ac output end 130b and load
120 connections.
Uninterruptible power system 130 includes: in double―transformed UPS high-frequency device 10 and energy accumulation device for fly wheel 20, in double changes
It changes formula UPS high-frequency device 10 to be set between ac input end 130a and ac output end 130b, in double―transformed UPS high-frequency device
10 include ac-to-dc rectifier 101, DC-AC inverter 102 and the first dc switch 104.Ac-to-dc rectifier
101 exchange side is connect with ac output end 130a, and the DC side of ac-to-dc rectifier 101 is by DC bus 105 and directly
The DC side of stream-AC inverter 102 connects, and the exchange side of DC-AC inverter 102 is connect with ac output end 130b,
Also it is connect with load 120, DC bus 105 is connect by route 103 and the first dc switch 104 with energy accumulation device for fly wheel 20.
Under normal circumstances, three-phase alternating-current supply 110 is rectified by AC power supply to ac input end 130a, then by AC-DC
Power is delivered to ac output end 130b by device 101 and DC-AC inverter 102.In addition, also being rectified by AC-DC
DC link between device 101 and DC-AC inverter 102 is realized to the charging of energy accumulation device for fly wheel 20 and flywheel energy storage
Device 20 is powered by DC-AC inverter 102 to ac output end 130b.Double―transformed UPS high-frequency device 10 further includes
Static by-pass 106 between ac input end 130a and ac output end 130b.
Energy accumulation device for fly wheel 20 includes: DC-AC reversible transducer 201, flywheel energy storage unit 202 and flywheel controller
203, the DC side of DC-AC reversible transducer 201 is connect by the second dc switch 204 with route 103；DC-AC
The exchange side of reversible transducer 201 is connect with flywheel energy storage unit 202, for for flywheel energy storage unit 202 provide charge power,
And receiving the output power of flywheel energy storage unit 202 is 120 power supply of load.
Specifically, the ac-to-dc rectifier 101 of the invention in double―transformed UPS high-frequency device 10, used for
IGBT rectifier, using boosting rectifier system, the voltage value for exporting DC bus is higher, and general representative value is 700V~800V
Or so, the DC-AC inverter 102 in the present embodiment is IGBT inverter, and the energy storage device of the present embodiment is flywheel energy storage
Device 20 comprising DC-AC reversible transducer 201, energy accumulation device for fly wheel 20 can pass through DC-AC reversible transducer
201 improve the voltage of DC side, and DC voltage is increased to the range to match with the voltage of DC bus 105, therefore, this
The DC voltage in the output of 10 DC bus 105 of double―transformed UPS high-frequency device of embodiment, can be straight without carrying out decompression processing
Connect and be delivered to energy accumulation device for fly wheel 20, therefore, the present embodiment in no setting is required the two-way DC/ of double―transformed UPS high-frequency device 10
DC battery converter, the embodiment of the present invention can be improved system effectiveness to the improvement in double―transformed UPS high-frequency device 10, drop
Low equipment cost reduces equipment volume.
Flywheel controller 203 is integrated into a part of energy accumulation device for fly wheel 20, and flywheel controller 203 according to flywheel for storing up
The operating status of the input voltage control energy accumulation device for fly wheel 20 of energy 20 input terminal of device.20 input terminal of energy accumulation device for fly wheel it is defeated
Entering voltage is the DC voltage that DC bus 105 exports, and flywheel controller 203 can be monitored supervises such as M1, M2 and/or M3
Sampled signal at measuring point, flywheel controller 203 include programmable processor, with software program in the programmable processor,
Functions described herein can be performed in the program.Specifically, the software program can network in electronic format by way of download
Into processor；It is situated between alternatively, the software program can store in such as storages such as magnetic memory, optical memory or electronic memory
In matter.In some embodiments, flywheel controller 203 can also include the additional or embedded hardware mould for accelerating it to operate
Block.Aforementioned hardware module may include discreet component, at least one Field Programmable Gate Array (FPGA) and/or at least one specially
With integrated circuit (ASIC).
Specifically, flywheel controller 203 is configured as executing following steps:
The continual input voltage for monitoring the energy accumulation device for fly wheel input terminal；When the input voltage is greater than or equal to first
When voltage threshold, charge to the energy accumulation device for fly wheel；When the input voltage is less than or equal to second voltage threshold value, control
Energy accumulation device for fly wheel discharges.
In a preferred embodiment, which includes: motor 2021 and flywheel body 2022,
In, motor 2021 is motor/generator all-in-one machine, and flywheel energy storage unit 202 uses when charging as motor, flywheel energy storage
When unit 202 discharges, used as generator.When charging, motor 2021 obtains the output of DC-AC reversible transducer 201
Electric power is to drive flywheel body 2022 to rotate, and flywheel body 2022 is for storing kinetic energy, and when electric discharge, flywheel body 2022 will be stored
Transferring kinetic energy to motor 2021, the electricity output end of motor 2021 is connect with the exchange side of DC-AC reversible transducer 201,
By the electrical energy transportation converted by kinetic energy to load 120.
It will be appreciated by those skilled in the art that emphasis of the invention does not lie in the structure of flywheel energy storage unit 202, the flywheel
Energy-storage units 202 can also use other implementations, within the scope of the present invention.
Energy accumulation device for fly wheel 20 has charged state, discharge condition and the standby mode (shape for neither charging nor discharging
State).
When the input voltage is greater than or equal to first voltage threshold value, the power of the DC-AC reversible transducer is controlled
For flow direction to flow to exchange side by DC side, control electrical machine working mode is electric motor mode, driving flywheel body rotation, by electric energy
Kinetic energy is converted to, energy accumulation device for fly wheel 20 is charged state.
When the input voltage is less than or equal to second voltage threshold value, the power of the DC-AC reversible transducer is controlled
For from exchange effluent to DC side, control electrical machine working mode is generator mode, the inertial drive of flywheel body generates electricity flow direction
Machine rotor rotation, converts kinetic energy into electric energy, and energy accumulation device for fly wheel 20 is discharge condition.
When the input voltage is greater than second voltage threshold value and is less than first voltage threshold value, it is two-way to control the DC-AC
Converter stops power conversion, and control energy accumulation device for fly wheel 20 enters standby mode.When energy accumulation device for fly wheel 20 enters standby shape
When state, under the premise of not considering energy loss, flywheel body 2022 will lean on self inertia to continue to rotate with current rotating speed.
Double―transformed UPS high-frequency device 10 further includes UPS controller 107, and UPS controller 107 is integrated in double―transformed UPS
It is mutually indepedent between UPS controller 107 and flywheel controller 203 in high-frequency device 10, the continual monitoring flywheel energy storage of difference
The input voltage of 20 input terminal of device, nothing are write to each other.
UPS controller 107 is configured as executing following steps: continual to monitor the defeated of 20 input terminal of energy accumulation device for fly wheel
Enter voltage；And when the input voltage is greater than or equal to upper limit voltage threshold value, first dc switch disconnection is controlled, so that should
Double―transformed UPS high-frequency device and the energy accumulation device for fly wheel decouple.UPS controller 107 also includes programmable processor, this can be compiled
With software program in thread processor, which can be performed functions described herein.Specifically, which can pass through net
The form of network in electronic format is downloaded in processor；Alternatively, the software program can store in such as magnetic memory, optical storage
On the storage mediums such as device or electronic memory.In some embodiments, control device 30 can also include for accelerating its operation
Additional or embedded hardware module.Aforementioned hardware module may include discreet component, at least one Field Programmable Gate Array
(FPGA) and/or at least one specific integrated circuit (ASIC).
In the present embodiment, double―transformed UPS high-frequency device has been internally integrated UPS controller, inside energy accumulation device for fly wheel
It is integrated with flywheel controller, two controllers work independently, the input voltage of energy accumulation device for fly wheel is monitored respectively, meanwhile, flywheel
Controller is adjusted between charged state and discharge condition according to the input voltage, and UPS controller is controlled according to the input voltage
Whether double―transformed UPS high-frequency device decouples with energy accumulation device for fly wheel, simplifies the complexity of system control, and based on above-mentioned
Regulative mode, can according to need the quantity for increasing energy accumulation device for fly wheel, and system is with good expansibility.
In a preferred embodiment, the flywheel controller 203 is other than monitoring input voltage, also to flywheel body
2022 revolving speed is monitored, when the input voltage is greater than or equal to first voltage threshold value and turns when the flywheel body reaches highest
When fast, the output power for controlling the DC-AC reversible transducer is power needed for maintaining the maximum speed of the flywheel body.
In a preferred embodiment, which detects that the input voltage is less than or equal to the second electricity
When pressing threshold value, the output power of the energy accumulation device for fly wheel 20 is controlled to maintain output voltage as second voltage threshold value.
Further, flywheel controller 203 is in addition to the input voltage of energy accumulation device for fly wheel 20 and turning for flywheel body 2022
Speed can also acquire the input direct-current electric current of energy accumulation device for fly wheel 20, may determine that integrated system by the input direct-current electric current
Whether operating status abnormal, specifically, the uninterruptible power system of the embodiment of the present invention at work:
(1) flywheel controller acquires input voltage Udc and the flywheel energy storage dress of Speed of Reaction Wheels and energy accumulation device for fly wheel in real time
The input direct-current electric current Idc set.
(2) energy accumulation device for fly wheel determines flywheel energy storage charge and discharge according to the revolving speed of the size of DC voltage Udc and flywheel
Control strategy, the charge and discharge of energy accumulation device for fly wheel are controlled by DC-AC reversible transducer.
(3) it when flywheel body revolving speed is lower than maximum speed, charges according to the specified charge power of energy accumulation device for fly wheel；When
After flywheel body revolving speed reaches maximum speed, according to maintaining minimum power required for maximum speed to charge, flywheel sheet is allowed
Body is maintained at maximum speed operation.
(4) when detecting input voltage Udc > upper limit voltage threshold value Uh_set, DC current Idc beyond permissible value or its
When he influences the unusual condition of system safety, flywheel controller and UPS controller can drive direct current independently by dry contact
The physical connection of energy accumulation device for fly wheel 20 and double―transformed UPS high-frequency device 10 is isolated in the tripping of switch.
(5) energy accumulation device for fly wheel 20 can improve the voltage of DC side by DC-AC reversible transducer 201, will be straight
Stream side voltage is increased to the range to match with the voltage of DC bus 105.
(6) ac-to-dc rectifier 101 used by double―transformed UPS high-frequency device 10 can be added in it by control
The driving of gate pole controls opening and turning off for ac-to-dc rectifier 101, and 101 switching frequency of ac-to-dc rectifier can be with
Control is in several kHz to several hundred kHz.
(7) it does not need to be led to without writing to each other between double―transformed UPS high-frequency device 10 and energy accumulation device for fly wheel 20
Letter.
(8) energy accumulation device for fly wheel can be worked with multi-machine parallel connection, to improve discharge power, extend discharge time.
Fig. 3 is that process is shown in FIG. 3 according to the control method of the uninterruptible power system 130 of the embodiment of the present invention
Figure, can support that following four kinds include one of control model in described control method or a variety of:
(a) it charge mode: powers under normal circumstances in three-phase alternating-current supply 110, controls the DC-AC reversible transducer
Power flow direction be by DC side flow to exchange side, control electrical machine working mode be electric motor mode, driving flywheel body rotate,
Kinetic energy is converted electrical energy into, and the power of DC-AC reversible transducer is the specified charge power of energy accumulation device for fly wheel.
(b) mode is kept: when flywheel body revolving speed reaches maximum speed, the output of the DC-AC reversible transducer
Power is power needed for maintaining the maximum speed of the flywheel body, and flywheel body revolving speed remains maximum speed.
(c) standby mode: DC-AC reversible transducer stops power conversion, and energy accumulation device for fly wheel enters standby mode.
(d) discharge mode: in three-phase alternating-current supply power loss, the power flow direction of DC-AC reversible transducer is by handing over
Effluent is flowed to DC side, and electrical machine working mode is generator mode, and the inertial drive generator amature rotation of flywheel body will be moved
Electric energy can be converted to, and the power of DC-AC reversible transducer is not more than the nominal discharge power of energy accumulation device for fly wheel, it should
The kinetic energy being stored in flywheel body is transferred to the motor by flywheel body.
Method shown in Fig. 3 is since monitoring step S301, in monitoring step S301, continual monitoring flywheel storage
The input voltage (M1) of energy device input terminal, certainly, those skilled in the art can also monitor the voltage of M2 or M3.It is walked in judgement
In rapid S302, when detecting that the input voltage is greater than or equal to first voltage threshold value, infer three-phase alternating-current supply to load
Power supply is normal, and energy accumulation device for fly wheel 20 enters charge mode.In next judgment step 304, by judging that flywheel body turns
Whether speed reaches maximum speed, to judge whether to enter holding mode from charge mode, when reaching maximum speed, into holding mould
When formula, not up to maximum speed, charge mode is maintained.
In judgment step S302, when detecting that the input voltage is less than first voltage threshold value, into judgment step
306.In judgment step 306, when detecting that the input voltage is less than or equal to second threshold voltage, three-phase alternating current is inferred
Source needs flywheel body energy storage device output power to maintain the power supply to load, energy accumulation device for fly wheel the abnormal electrical power supply of load
20 enter discharge mode.In judgment step 306, when detecting that the input voltage is greater than second threshold voltage, three-phase is inferred
The service restoration of AC power source is load supplying without energy accumulation device for fly wheel, and energy accumulation device for fly wheel 20, which does not charge, also not to discharge, and is flown
It takes turns energy storage device 20 and enters standby mode.
Further, in step S307, further includes: control the output power of the flywheel body energy storage device to maintain this
The output voltage of energy accumulation device for fly wheel is second voltage threshold value.
Further, it please refers to shown in Fig. 4, on the basis of flow chart shown in Fig. 3, in judgment step S302, works as inspection
When measuring the input voltage more than or equal to first voltage threshold value, before entering charge mode, judgment step can be entered
309, judge whether the input voltage is greater than or equal to upper limit voltage threshold value, when 309 result of judgment step, which is, is, between inferring not
Power-off source 130 is operating abnormally, and is controlled second dc switch 204 and is disconnected (tripping), so that the double―transformed UPS high-frequency device 10
It is decoupled with the energy accumulation device for fly wheel 20；When 309 result of judgment step is no, into charge mode.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of double transform uninterruptible power systems of high frequency using flywheel energy storage, which is characterized in that the system includes:
Double―transformed UPS high-frequency device between ac input end and ac output end, the double―transformed UPS high frequency dress
Set the DC-AC inverter for including: ac-to-dc rectifier and connecting with the ac-to-dc rectifier；
It is coupled in the flywheel energy storage dress of the DC bus between the ac-to-dc rectifier and the DC-AC inverter
It sets, the energy accumulation device for fly wheel includes: the DC-AC reversible transducer connecting with the DC bus and the direct current-friendship
Flow reversible transducer connection flywheel energy storage unit and with the DC-AC reversible transducer and the flywheel energy storage unit
The flywheel controller being all connected with, the flywheel controller are used to be controlled according to the input voltage of the energy accumulation device for fly wheel input terminal
The operating status of the energy accumulation device for fly wheel.
2. the double transform uninterruptible power systems of the high frequency according to claim 1 using flywheel energy storage, which is characterized in that
The flywheel controller is configured as executing following steps:
The input voltage of the continual monitoring energy accumulation device for fly wheel input terminal；
When the input voltage is greater than or equal to first voltage threshold value, charge to the energy accumulation device for fly wheel；And
When the input voltage is less than or equal to second voltage threshold value, control energy accumulation device for fly wheel discharges.
3. the double transform uninterruptible power systems of the high frequency according to claim 1 using flywheel energy storage, which is characterized in that
The flywheel energy storage unit includes:
For storing the flywheel body of energy；
The motor being connect with the flywheel body.
4. the double transform uninterruptible power systems of the high frequency according to claim 3 using flywheel energy storage, which is characterized in that
The flywheel controller is configured as executing following steps:
The input voltage of the continual monitoring energy accumulation device for fly wheel input terminal；
When the input voltage is greater than or equal to first voltage threshold value, the power of the DC-AC reversible transducer is controlled
For flow direction to flow to exchange side by DC side, control electrical machine working mode is electric motor mode, driving flywheel body rotation, by electric energy
Be converted to kinetic energy；
When the input voltage is less than or equal to second voltage threshold value, the power of the DC-AC reversible transducer is controlled
For from exchange effluent to DC side, control electrical machine working mode is generator mode, the inertial drive of flywheel body generates electricity flow direction
Machine rotor rotation, converts kinetic energy into electric energy；
When the input voltage is greater than second voltage threshold value and is less than first voltage threshold value, it is two-way to control the DC-AC
Converter stops power conversion, and control energy accumulation device for fly wheel enters standby mode.
5. the double transform uninterruptible power systems of the high frequency according to claim 3 using flywheel energy storage, which is characterized in that
The double―transformed UPS high-frequency device further includes opening set on the first direct current between the DC bus and energy accumulation device for fly wheel
It closes and UPS controller, the UPS controller is configured as executing following steps: the continual monitoring flywheel energy storage dress
Set the input voltage of input terminal；And when the input voltage is greater than or equal to upper limit voltage threshold value, it is straight to control described first
Stream switch disconnects, so that the double―transformed UPS high-frequency device and the energy accumulation device for fly wheel decouple；And/or
The energy accumulation device for fly wheel further includes being set between DC-AC reversible transducer and double―transformed UPS high-frequency device
Second dc switch；And/or
The double―transformed UPS high-frequency device further includes set on the static by-pass between ac input end and ac output end.
6. a kind of double transform uninterruptible power systems of the high frequency described in any one of claim 1 to 5 using flywheel energy storage
Control method, which is characterized in that the control method includes:
The input voltage of the continual monitoring energy accumulation device for fly wheel input terminal；
When the input voltage is greater than or equal to first voltage threshold value, charge to the energy accumulation device for fly wheel；And
When the input voltage is less than or equal to second voltage threshold value, control energy accumulation device for fly wheel discharges.
7. control method according to claim 6, which is characterized in that described " when the input voltage is greater than or equal to the
When one voltage threshold, charge to the energy accumulation device for fly wheel " the step of include:
When the input voltage is greater than or equal to first voltage threshold value, the power of the DC-AC reversible transducer is controlled
For flow direction to flow to exchange side by DC side, control electrical machine working mode is electric motor mode, driving flywheel body rotation, by electric energy
Be converted to kinetic energy.
8. control method according to claim 6, which is characterized in that described " when the input voltage is less than or equal to the
When two voltage thresholds, control energy accumulation device for fly wheel discharge " the step of include:
When the input voltage is less than or equal to second voltage threshold value, the power of the DC-AC reversible transducer is controlled
For from exchange effluent to DC side, control electrical machine working mode is generator mode, the inertial drive of flywheel body generates electricity flow direction
Machine rotor rotation, converts kinetic energy into electric energy.
9. control method according to claim 6, which is characterized in that the control method further include:
When the input voltage is greater than or equal to first voltage threshold value and when the flywheel body reaches maximum speed, institute is controlled
The output power for stating DC-AC reversible transducer is power needed for maintaining the maximum speed of the flywheel body；And/or
When the input voltage is less than or equal to second voltage threshold value, the output power of the energy accumulation device for fly wheel is controlled to tie up
The output voltage for holding the energy accumulation device for fly wheel is second voltage threshold value；And/or
When the input voltage is greater than second voltage threshold value and is less than first voltage threshold value, it is two-way to control the DC-AC
Converter stops power conversion, and control energy accumulation device for fly wheel enters standby mode.
10. control method according to claim 7, which is characterized in that further include:
When the input voltage be greater than or equal to upper limit voltage threshold value when, control the double―transformed UPS high-frequency device with it is described
Energy accumulation device for fly wheel decoupling.
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