CN106385043A - Multiple parallel electric power peak-load shifting device having uninterrupted power source function - Google Patents
Multiple parallel electric power peak-load shifting device having uninterrupted power source function 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
- H02J3/28—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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
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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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention relate to a multiple parallel electric power peak-load shifting device having uninterrupted power source function, the device is characterized in that the device comprises a power unit, a combiner box, an AC bidirectional thyristor module, a by-pass switch and a controller; the working method of the device comprises three phases including device starting, current source working and voltage source working; the advantages of the device comprises: 1, a technology for quickly turning a thyristor off is utilized, the response speed is fast, the standby efficiency is high, the working is stable, the structure is simple, the product cost is effectively saved, the maintenance is convenient, the operation is easy, and the cost performance is relatively high; 2, a plurality power units can be connected in parallel, the device capacity can be further expanded, and the high capacity configuration of the device can be achieved; and 3, the device has a peak-load shifting function and an uninterrupted power source function, the power consumption cost can be saved for enterprises, and the enterprise economic benefit can be improved.
Description
(1) technical field：
The present invention relates to a kind of multi-parallel peak load cutting device with uninterrupted power source function, belong to power equipment
Technical field.
(2) background technology：
Power plant is usually round-the-clock and persistently generates electricity, if the electricity being sent cannot be dissolved in time, for the energy generating electricity
Utilization rate then can reduce, especially to generation of electricity by new energy.One power plant generating capacity is typically relatively-stationary, but electricity consumption is high
Peak, generally on daytime, so results in electric not enough phenomenon on daytime, and then become low power consumption in the evening, causes power generation energy resource to utilize
Rate reduces, and by Peak-valley TOU power price means, a part of peak load is moved to the low ebb phase for this problem power system, to reach
Purpose to energy saving.
Peak-valley TOU power price refers to the load variations situation according to electrical network, is divided within daily 24 hours peak, flat section, low
Multiple period such as paddy, different electricity price levels are formulated respectively to day part, to encourage the Electricity customers reasonable arrangement electricity consumption time, cut
Peak load, improves the utilization ratio of electric power resource.But much enterprise is relatively fixed the production time, therefore real by energy storage mode
Existing peak load shifting is adopted by more and more enterprises.Especially as the development of accumulator and Power Electronic Technique, based on electric power storage
Pond Large Copacity peak load shifting pattern has been used widely.
Require higher high-end manufacturing industry for power supply reliability, corresponding solution is mainly important sensitive load
Configuration uninterrupted power source (UPS), on line type UPS is lost larger and relatively costly online, and off-line UPS response speed more slowly cannot
Meet the requirement of sensitive load, uninterrupted power source is also based on batteries to store energy realization simultaneously, thus leading to peak load shifting energy storage
Device is reused with uninterrupted power source energy storage device, considerably increases investment of production, reduces business electrical efficiency.
(3) content of the invention：
It is an object of the invention to proposing a kind of multi-parallel peak load cutting device with uninterrupted power source function, it
The deficiencies in the prior art can be overcome, by bidirectional thyristor module will be sealed between electric power system and load, not only can lead to
Cross the peak load shifting function based on time-of-use tariffs for the batteries to store energy realization, and the function of uninterrupted power source can be realized；Pass through
Peak load shifting function can save electric cost in a large number for enterprise, can reduce enterprise by uninterrupted power source function uninterruptedly electric
Source consumption, improves Business Economic Benefit.
Technical scheme：A kind of multi-parallel peak load cutting device with uninterrupted power source function, including
Load M, voltage transformer CT1, current transformer PT1, voltage transformer CT2 summation current transformer PT2 are it is characterised in that it wraps
Include power cell, header box, alternating-current bidirectional thyristor module, by-pass switch and controller；Wherein, the high pressure of described power cell
Side is connected with the inverter side of header box；The grid side of described header box is connected in parallel on the outfan MA of alternating-current bidirectional thyristor module
And the load M in electrical network between；The input of described alternating-current bidirectional thyristor module respectively with electrical network alternating current power supply A phase, B phase
It is connected with C；The outfan of described alternating-current bidirectional thyristor module is connected with load M；It is double that described by-pass switch is connected in parallel on exchange
To thyristor module two ends；The input receiving voltage transformer CT1 of described controller, current transformer PT1, voltage transformer
CT2, the voltage and current signal of current transformer PT2, its outfan is connected with the input of power cell.
Described power cell is by N number of power module parallel parallel with one another, and N is the positive integer more than or equal to 1；Described N
Individual power model has identical structure, is all by accumulator battery, dc switch buffer circuit, three-phase inverter module and transformation
Device is constituted；Wherein, described accumulator battery is connected in parallel on the DC side two ends of three-phase inverter module；Described dc switch buffer circuit
It is connected between accumulator battery and three-phase inverter module DC side, its input receives the output signal of controller；Described three
The ac output end of phase inverter module is connected with the low-pressure side of transformator；Header box and electricity are passed through in the high-pressure side of described transformator
Net connects；It is in parallel between described N number of power model.
Described dc switch buffer circuit is made up of resistance R, switch S1, switch S2, wherein said resistance R and switch S1
It is serially connected；The series arm that described switch S2 is constituted with by resistance R and switch S1 is in parallel.Dc switch buffer circuit is connected on
Between three-phase inverter DC side and accumulator battery.
Described header box adopts bus structure, and its inverter side can access at least one three-phase inverter module, to realize
The AC of three-phase inverter module is connected in parallel.
Described alternating-current bidirectional thyristor module is made up of three bidirectional thyristors；It is characterized in that described alternating-current bidirectional crystalline substance lock
Tube module is made up of three bidirectional thyristor submodules；Described three bidirectional thyristor submodules are independently connected to three-phase alternating current
System A, B, C three-phase；Each bidirectional thyristor submodule can be by the bidirectional thyristor no less than with series-parallel system group
Close and constitute.
Described accumulator battery is made up of with series-parallel form the single battery no less than 1.
Described three-phase inverter module can be three-phase bridge inverter structure, three-level inverter structure or three single-phase inversions
One of device structure is formed with LCL filter.
Described transformator is three-phase transformer, and low-pressure side is usually 400V, and high-pressure side is usually 6kV or 10kV.
A kind of method of work of the multi-parallel peak load cutting device with uninterrupted power source function it is characterised in that it
Comprise the following steps：
(1) device startup stage：
1. the accumulator battery in power cell passes through dc switch buffer circuit to the charging of three-phase inverter module DC side,
The now switch S1 closure in dc switch buffer circuit, switch S2 disconnects；
2. when the voltage of accumulator is equal to the DC voltage of three-phase inverter module, now switch S2 closure, switch
S1 disconnects；
3. two switches of the direct current buffer circuit in power cell are controlled by controller output signal K1；Power cell
Two switches of the direct current buffer circuit in 2 are then controlled by controller output signal K2；
(2) device current source working stage：
1. controller output-scr trigger is so that alternating-current bidirectional thyristor module triggering and conducting；
2. when system AC power supplies is normal, system AC power supplies is powered to load M by alternating-current bidirectional IGCT, if currently
Electricity price is at a low ebb, then three-phase inverter module is operated under controlled rectification pattern, is battery charging；If current electricity prices
When being in peak value, then three-phase inverter module is operated under inverter mode, will discharge accumulator battery storage energy, provides for load
Energy, reduces system power supply AC power consumption；
3. now three-phase inverter module is operated under current source mode, then controller passes through Current Transmit 1 and electricity
Current transformer CT2 gathers the output current of each three-phase inverter module, realizes inverter current tracing control, suppresses work(simultaneously
The generation of circulation between rate unit；
(3) device voltage source working stage：
1., when system AC power supplies occurs voltage failure, controller passes through voltage transformer pt 1 detection and judges voltage event
After barrier, three-phase inverter module realizes effective pass of bidirectional thyristor by back-pressure pulse method or load current transfer method
Disconnected, its working condition is switched to voltage source mode by current source mode；
2. controller passes through voltage transformer pt 2 and voltage transformer pt 3 realizes the closed loop of inverter module output voltage
Control, controller realizes the loop current suppression of multiple power models by electric Current Transmit 1 summation current transformer CT2；
3. accumulator battery passes through the exchange output offer energy for three-phase inverter module for the DC side of three-phase inverter module
Amount, three-phase inverter module is as voltage source to maintain the normal work of load M；
4., after system power supply AC recovers normal, three-phase inverter module then exits voltage source mode of operation and is again started up
Current source mode of operation, alternating-current bidirectional thyristor module is switched on to maintain the normal work of load；By-pass switch can handed over
After stream bidirectional thyristor module failure, closure guarantees load power supply continuity.
The superiority of the present invention：1st, employ and can rapidly switch off IGCT technology, not only there is the response speed being exceedingly fast, treat
Engine efficiency is high, working stability, and structure is simple, has effectively saved product cost, is easy to safeguard it is easy to operate, cost performance
Higher；2nd, pass through multiple power cells in parallel, can expansion instrument capacity further, the Large Copacity realizing device configures；3rd, same
When possess peak load cutting function and uninterrupted power source function, so be only enterprise save electric cost, simultaneously improve enterprise
Industry economic benefit.
(4) brief description：
Fig. 1 is a kind of circuit knot of multi-parallel peak load cutting device with uninterrupted power source function involved by the present invention
Structure schematic diagram.
Fig. 2 is that in a kind of multi-parallel peak load cutting device with uninterrupted power source function involved by the present invention, direct current is opened
Close the electrical block diagram of buffer circuit.
Fig. 3 be in a kind of multi-parallel peak load cutting device with uninterrupted power source function involved by the present invention in conflux
The electronic schematic diagram of case.
Fig. 4 is the brilliant lock in a kind of multi-parallel peak load cutting device with uninterrupted power source function involved by the present invention
(wherein, Fig. 4-a is Thyristors in series schematic diagram to tube module connection in series-parallel schematic diagram, and Fig. 4-b is tandem principle after IGCT first parallel connection
Figure).
Fig. 5 is accumulator in a kind of multi-parallel peak load cutting device with uninterrupted power source function involved by the present invention
The group mould schematic diagram of group.
(5) specific embodiment：
Embodiment：A kind of multi-parallel peak load cutting device (see Fig. 1) with uninterrupted power source function, including load
M, voltage transformer CT1, current transformer PT1, voltage transformer CT2 summation current transformer PT2 are it is characterised in that it includes work(
Rate unit, header box, alternating-current bidirectional thyristor module, by-pass switch and controller；Wherein, the high-pressure side of described power cell with
The inverter side of header box connects；The grid side of described header box is connected in parallel on outfan MA and the electricity of alternating-current bidirectional thyristor module
Between load M in net；The input of described alternating-current bidirectional thyristor module respectively with electrical network alternating current power supply A phase, B phase and C
It is connected；The outfan of described alternating-current bidirectional thyristor module is connected with load M；It is brilliant that described by-pass switch is connected in parallel on alternating-current bidirectional
Brake tube module two ends；The input receiving voltage transformer CT1 of described controller, current transformer PT1, voltage transformer CT2,
The voltage and current signal of current transformer PT2, its outfan is connected with the input of power cell.
Described power cell is by N number of power module parallel (see Fig. 1) parallel with one another, and N is just whole more than or equal to 1
Number；Described N number of power model has identical structure, is all by accumulator battery, dc switch buffer circuit, three-phase inverter mould
Block and transformator are constituted；Wherein, described accumulator battery is connected in parallel on the DC side two ends of three-phase inverter module；Described dc switch
Buffer circuit is connected between accumulator battery and three-phase inverter module DC side, and its input receives the output letter of controller
Number；The ac output end of described three-phase inverter module is connected with the low-pressure side of transformator；The high-pressure side of described transformator is passed through
Header box is connected with electrical network；It is in parallel between described N number of power model.
Described dc switch buffer circuit (see Fig. 2) is made up of resistance R, switch S1, switch S2, wherein said resistance R
It is serially connected with switch S1；The series arm that described switch S2 is constituted with by resistance R and switch S1 is in parallel.Dc switch buffering electricity
Road is connected between three-phase inverter DC side and accumulator battery.
Described header box adopts bus structure (see Fig. 3), and its inverter side can access at least one three-phase inverter module,
It is connected in parallel with the AC realizing three-phase inverter module.
Described alternating-current bidirectional thyristor module forms (see Fig. 4) by three bidirectional thyristors；Described alternating-current bidirectional IGCT
Module is made up of three bidirectional thyristors；It is characterized in that described alternating-current bidirectional thyristor module is by three bidirectional thyristor submodules
Block forms；Described three bidirectional thyristor submodules are independently connected to three-phase alternating current system A, B, C three-phase；Each two-way crystalline substance lock
Pipe module can be combined with series-parallel system by the bidirectional thyristor no less than and be constituted (see Fig. 4-a, Fig. 4-b)；As double
The tandem compound (see Fig. 4-b) to after the direct series connection of IGCT or bidirectional thyristor first parallel connection.
Described accumulator battery (see Fig. 5) is made up of with series-parallel form the single battery no less than 1.
Described three-phase inverter module can be three-phase bridge inverter structure, three-level inverter structure or three single-phase inversions
One of device structure is formed with LCL filter.
Described transformator is three-phase transformer, and low-pressure side is usually 400V, and high-pressure side is usually 6kV or 10kV.
A kind of method of work of the multi-parallel peak load cutting device with uninterrupted power source function it is characterised in that it
Comprise the following steps：
(1) device startup stage：
1. the accumulator battery in power cell passes through dc switch buffer circuit to the charging of three-phase inverter module DC side,
Now the switch S 1 in dc switch buffer circuit closes, and switch S2 disconnects；
2. when the voltage of accumulator is equal to the DC voltage of three-phase inverter module, now switch S2 closure, switch
S1 disconnects；
3. two switches of the direct current buffer circuit in power cell are controlled by controller output signal K1；Power cell
Two switches of the direct current buffer circuit in 2 are then controlled by controller output signal K2；
(2) device current source working stage：
1. controller output-scr trigger is so that alternating-current bidirectional thyristor module triggering and conducting；
2. when system AC power supplies is normal, system AC power supplies is powered to load M by alternating-current bidirectional IGCT, if currently
Electricity price is at a low ebb, then three-phase inverter module is operated under controlled rectification pattern, is battery charging；If current electricity prices
When being in peak value, then three-phase inverter module is operated under inverter mode, will discharge accumulator battery storage energy, provides for load
Energy, reduces system power supply AC power consumption；
3. now three-phase inverter module is operated under current source mode, then controller passes through Current Transmit 1 and electricity
Current transformer CT2 gathers the output current of each three-phase inverter module, realizes inverter current tracing control, suppresses work(simultaneously
The generation of circulation between rate unit；
(3) device voltage source working stage：
1., when system AC power supplies occurs voltage failure, controller passes through voltage transformer pt 1 detection and judges voltage event
After barrier, three-phase inverter module realizes effective pass of bidirectional thyristor by back-pressure pulse method or load current transfer method
Disconnected, its working condition is switched to voltage source mode by current source mode；
2. controller passes through voltage transformer pt 2 and voltage transformer pt 3 realizes the closed loop of inverter module output voltage
Control, controller realizes the loop current suppression of multiple power models by electric Current Transmit 1 summation current transformer CT2；
3. accumulator battery passes through the exchange output offer energy for three-phase inverter module for the DC side of three-phase inverter module
Amount, three-phase inverter module is as voltage source to maintain the normal work of load M；
4., after system power supply AC recovers normal, three-phase inverter module then exits voltage source mode of operation and is again started up
Current source mode of operation, alternating-current bidirectional thyristor module is switched on to maintain the normal work of load；By-pass switch can handed over
After stream bidirectional thyristor module failure, closure guarantees load power supply continuity.
Claims (9)
1. a kind of multi-parallel peak load cutting device with uninterrupted power source function, including load M, voltage transformer CT1,
Current transformer PT1, voltage transformer CT2 summation current transformer PT2 are it is characterised in that it includes power cell, header box, friendship
Stream bidirectional thyristor module, by-pass switch and controller；Wherein, the inverter side of the high-pressure side of described power cell and header box
Connect；The grid side of described header box is connected in parallel between the load M in the outfan MA and electrical network of alternating-current bidirectional thyristor module；
The input of described alternating-current bidirectional thyristor module is connected with electrical network alternating current power supply A phase, B phase and C respectively；Described exchange is double
It is connected to the outfan of thyristor module with load M；Described by-pass switch is connected in parallel on alternating-current bidirectional thyristor module two ends；Described
The input receiving voltage transformer CT1 of controller, current transformer PT1, voltage transformer CT2, the electricity of current transformer PT2
Current voltage signal, its outfan is connected with the input of power cell.
2. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 1, its feature
It is that described power cell is by N number of power module parallel parallel with one another, N is the positive integer more than or equal to 1；Described N number of work(
Rate module has identical structure, is all by accumulator battery, dc switch buffer circuit, three-phase inverter module and transformator structure
Become；Wherein, described accumulator battery is connected in parallel on the DC side two ends of three-phase inverter module；Described dc switch buffer circuit series connection
Between accumulator battery and three-phase inverter module DC side, its input receives the output signal of controller；Described three contraries
The ac output end becoming device module is connected with the low-pressure side of transformator；Header box is passed through with electrical network even in the high-pressure side of described transformator
Connect；It is in parallel between described N number of power model.
3. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 1, its feature
It is that described dc switch buffer circuit is made up of resistance R, switch S1, switch S2, wherein said resistance R is mutual with switch S1
Series connection；The series arm that described switch S2 is constituted with by resistance R and switch S1 is in parallel；Dc switch buffer circuit is connected on three-phase
Between inverter direct-flow side and accumulator battery.
4. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 1, its feature
It is that described header box adopts bus structure, its inverter side can access at least one three-phase inverter module, to realize three-phase
The AC of inverter module is connected in parallel.
5. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 1, described friendship
Stream bidirectional thyristor module is made up of three bidirectional thyristors；It is characterized in that described alternating-current bidirectional thyristor module is double by three
To IGCT submodule composition；Described three bidirectional thyristor submodules are independently connected to three-phase alternating current system A, B, C three-phase；
Each bidirectional thyristor submodule can be combined with series-parallel system by the bidirectional thyristor no less than and be constituted.
6. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 2, its feature
It is that described accumulator battery is made up of with series-parallel form the single battery no less than 1.
7. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 2, its feature
It is that described three-phase inverter module can be three-phase bridge inverter structure, three-level inverter structure or three single-phase inverter knots
One of structure is formed with LCL filter.
8. a kind of multi-parallel peak load cutting device with uninterrupted power source function according to claim 2, its feature
It is that described transformator is three-phase transformer, low-pressure side is usually 400V, and high-pressure side is usually 6kV or 10kV.
9. a kind of method of work of the multi-parallel peak load cutting device with uninterrupted power source function is it is characterised in that it wraps
Include following steps：
(1) device startup stage：
1. the accumulator battery in power cell is charged to three-phase inverter module DC side by dc switch buffer circuit, now
Switch S1 closure in dc switch buffer circuit, switch S2 disconnects；
2. when the voltage of accumulator is equal to the DC voltage of three-phase inverter module, now switch S2 closure, switch S1 breaks
Open；
3. two switches of the direct current buffer circuit in power cell are controlled by controller output signal K1；In power cell 2
Two switches of direct current buffer circuit then controlled by controller output signal K2；
(2) device current source working stage：
1. controller output-scr trigger is so that alternating-current bidirectional thyristor module triggering and conducting；
2. when system AC power supplies is normal, system AC power supplies is powered to load M by alternating-current bidirectional IGCT, if current electricity prices
At a low ebb, then three-phase inverter module is operated under controlled rectification pattern, is battery charging；If current electricity prices are in
During peak value, then three-phase inverter module is operated under inverter mode, will discharge accumulator battery storage energy, provides energy for load
Amount, reduces system power supply AC power consumption；
3. now three-phase inverter module is operated under current source mode, then controller passes through Current Transmit 1 and electric current is mutual
Sensor CT2 gathers the output current of each three-phase inverter module, realizes inverter current tracing control, suppresses power list simultaneously
The generation of circulation between unit；
(3) device voltage source working stage：
1. when system AC power supplies occur voltage failure when, controller pass through voltage transformer pt 1 detect judge voltage failure after,
Three-phase inverter module realizes effective shutoff of bidirectional thyristor, its work by back-pressure pulse method or load current transfer method
Make state and voltage source mode is switched to by current source mode；
2. controller passes through voltage transformer pt 2 and voltage transformer pt 3 realizes the closed loop control of inverter module output voltage,
Controller realizes the loop current suppression of multiple power models by electric Current Transmit 1 summation current transformer CT2；
3. accumulator battery provides energy by the DC side of three-phase inverter module for the exchange output of three-phase inverter module, and three
Phase inverter module is as voltage source to maintain the normal work of load M；
4., after system power supply AC recovers normal, three-phase inverter module then exits voltage source mode of operation and is again started up electric current
Source mode of operation, alternating-current bidirectional thyristor module is switched on to maintain the normal work of load；By-pass switch can be double in exchange
To after thyristor module fault, closure guarantees load power supply continuity.
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| CN201610819071.3A CN106385043A (en) | 2016-09-13 | 2016-09-13 | Multiple parallel electric power peak-load shifting device having uninterrupted power source function |
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