CN109950969A - A kind of transformer station direct current system emergency power supply spare based on photovoltaic - Google Patents
A kind of transformer station direct current system emergency power supply spare based on photovoltaic Download PDFInfo
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- CN109950969A CN109950969A CN201910258002.3A CN201910258002A CN109950969A CN 109950969 A CN109950969 A CN 109950969A CN 201910258002 A CN201910258002 A CN 201910258002A CN 109950969 A CN109950969 A CN 109950969A
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- 230000008676 import Effects 0.000 claims description 2
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- 238000012423 maintenance Methods 0.000 abstract description 2
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- 241000196324 Embryophyta Species 0.000 description 9
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Classifications
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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
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
-
- 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
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a kind of transformer station direct current system emergency power supply spare based on photovoltaic, the power supply includes the double power supply converting switch connecting with substation two sections of ac bus, DC-AC inverter, photovoltaic DC-DC current transformer and two are connected to the isolated form DC-DC current transformer of transforming plant DC bus.Emergency power supply of the present invention is in station AC system maintenance or power loss, or station, with charger damage or when overhauling, roof of transformer substation photovoltaic realizes redundant power supply, while passing through the seamless incision of isolation DC-DC current transformer realization, the risk of only storage battery power supply is reduced, system redundancy and reliability are improved；When normal operation, photovoltaic electricity can be uploaded to ac bus by double power supply converting switch, reduce operating cost；It can also act as battery automatic discharging circuit, reduce operation operating procedure, improve safety coefficient；It is very suitable for transforming plant DC bus emergency guarantee field.
Description
Technical field
The present invention relates to a kind of transformer station direct current system emergency power supply spare based on photovoltaic, belongs to the technology of power electronics
Field.
Background technique
In recent years, with advances in technology with the reduction of cost, photovoltaic power generation is used widely.Photovoltaic power generation is can be again
The raw energy, not only can be effectively reduced pollution, but also can effectively regulate and control the flow direction of trend by inverter.At the same time,
With the development of economy, the quantity and scale of substation are increasing, but the requirement of power supply reliability is also increasing, therefore become
The design requirement in power station is also higher and higher.Although multistage DC bus has multiple chargers and the power supply of battery group, report is aobvious
Show, transforming plant DC bus still has some potential safety problems, mostly occurs causing main transformer to damage because of DC bus power loss
Phenomena such as bad or overstepping, the severe jamming normal operation of electric power enterprise cause certain economic loss and social shadow
It rings.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of, and the transformer station direct current system spare based on photovoltaic is met an urgent need
Power supply, when station is damaged or overhauled with AC system maintenance or power loss or station charger, roof of transformer substation photovoltaic is realized superfluous
Remaining power supply, while seamless incision is realized by isolation DC-DC current transformer, the risk of only storage battery power supply is reduced, it is superfluous to improve system
Remaining and reliability；When normal operation, photovoltaic electricity can be uploaded to ac bus by double power supply converting switch, reduce operation
Cost；It can also act as battery automatic discharging circuit, reduce operation operating procedure, improve safety coefficient；It is very suitable for becoming
Electric station DC bus emergency guarantee field.
The present invention adopts the following technical solutions to achieve:
A kind of transformer station direct current system emergency power supply spare based on photovoltaic, it is double including what is connect with substation two sections of ac bus
Power change-over switch, DC-AC inverter, photovoltaic DC-DC current transformer and two are connected to two sections of DC bus of substation
Isolated form DC-DC current transformer；
Two sections of ac bus are set to No. 1 ac bus and No. 2 ac bus；
No. 1 ac bus of first power port docking station of double power supply converting switch, second power supply port docking station is with 2
Number ac bus, output port connect DC-AC inverter and exchange side；
DC-AC inverter uses PWM converter, and the exchange side of DC-AC inverter passes through inductance connection double power supply converting switch
The DC side of output port, DC-AC inverter connects emergency power supply direct current common bus, and in parallel with DC filter capacitors；
Photovoltaic DC-DC current transformer is a non-isolated BOOST circuit, and the busbar connector output of input connection photovoltaic array is defeated
Outlet connects emergency power supply direct current common bus；
Two isolated form DC-DC current transformers are respectively the first isolated form DC-DC current transformer and the second isolated form DC-DC current transformer,
First isolated form DC-DC current transformer and the second isolated form DC-DC current transformer are two double half-bridge converter (dual half
Bridge, DHB), it is intermediate to be isolated respectively by high frequency transformer, power can two-way flow, input is emergency power supply direct current public affairs
Common bus, output are separately connected 1 section and 2 sections of DC bus.
The double power supply converting switch uses commercially available positive Thailand's NZ7-125 Intelligent switch.
It stands when being operated normally with ac bus, it is straight that the electric energy that photovoltaic array provides by BOOST circuit flows into emergency power supply
Common bus is flowed, is then exported by DC-AC inverter, ac bus is imported using double power supply converting switch, gives substation
AC load power supply.It stands when all being stopped transport with ac bus, the electric energy that photovoltaic array provides flows into emergency power supply by BOOST circuit
Direct current common bus gives transforming plant DC load supplying then by two isolated form DC-DC current transformer outputs, and reduction only stores
Probability of malfunction when battery is powered.
It stands when all being damaged with charger, it is public that the electric energy that photovoltaic array provides by BOOST circuit flows into emergency power supply direct current
Common bus gives transforming plant DC load supplying then by two isolated form DC-DC current transformer outputs；If photovoltaic array is not
It can power, DC-AC inverter stablizes emergency power supply direct current common bus from ac bus rectisorption electric energy, then passes through two
A isolated form DC-DC current transformer output, gives transforming plant DC load supplying, reduces probability of malfunction when only storage battery power supply.
When battery needs to carry out discharge test, without carrying out discharge load wiring process, it need to only send instructions to and answer
Urgent telegram source, power supply first passes through dc circuit breaker switching and realizes battery access isolated form DC-DC current transformer, then passes through isolated form DC-
DC current transformer reverse feeding is to emergency power supply direct current common bus, then by exporting by DC-AC inverter, finally by double
Power change-over switch imports ac bus, powers to substation's AC load, achieves that battery discharge reality by certain time
It tests.
Emergency power supply detects the voltage of transforming plant DC bus immediately, when DC bus section voltage is lower than certain threshold value
When, the operation of isolated form DC-DC current transformer can be triggered automatically, ensure the stabilization of DC voltage.
Advantageous effects of the invention:
1, roof of transformer substation is made full use of, photovoltaic power generation is carried out, reduces the operating cost of substation；
2, it in such a way that photovoltaic electric energy supplies DC bus, effectively improves DC bus powered reliable when ac bus failure
Property；
3, it is automatically controlled by isolated form DC-DC current transformer, of short duration Voltage Drop can be prevented with stable DC busbar voltage；
4, battery discharge equipment can be served as automatically, detects the performance of battery, and electric energy feedback communication bus, be lost low；
5, all control logics are automatically performed, and apparent DC dump process is not present.
Detailed description of the invention
Fig. 1 is emergency power supply schematic diagram of the invention；
Fig. 2 is DC-AC inverter schematic diagram of the invention；
Fig. 3 is photovoltaic array BOOST circuit diagram of the invention；
Fig. 4 is isolated form DC-DC current transformer schematic diagram of the invention；
Fig. 5 is energy flux figure a of the invention；
Fig. 6 is energy flux figure b of the invention；
Fig. 7 is energy flux figure c of the invention；
Fig. 8 is energy flux figure d of the invention；
Fig. 9 is energy flux figure e of the invention；
Figure 10 is energy flux figure f of the invention；
Figure 11 is control flow chart of the invention；
Figure 12 is battery discharge schematic diagram of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of transformer station direct current system emergency power supply spare based on photovoltaic, which includes one and change
The double power supply converting switch of the two sections of ac bus in power station connection, a DC-AC inverter, a photovoltaic DC-DC current transformer, and
Two are connected to the isolated form DC-DC current transformer of two sections of DC bus of substation.
First power port of double power supply converting switch is connect with station with No. 1 ac bus, second power supply port and
It stands and is connected with No. 2 ac bus, the output port of double power supply converting switch is connect with DC-AC inverter exchange side.
As shown in Fig. 2, DC-AC inverter uses PWM converter, it include 3 phase inductances, 6 IGBT and 1 DC filterings
Capacitor, 6 IGBT form three-phase bridge, and the exchange side of DC-AC inverter and the output port of double power supply converting switch connect,
The DC side of DC-AC inverter is connect with emergency power supply direct current common bus；
As shown in figure 3, photovoltaic DC-DC current transformer is a non-isolated BOOST circuit, the confluence of input connection photovoltaic array
Row's output, output end connect emergency power supply direct current common bus；Non-isolated BOOST circuit includes 1 IGBT(Spv), 1 two
Pole pipe DpvWith 1 inductance Lpv, inductance LpvOne end connection photovoltaic array busbar connector positive output end, inductance LpvThe other end
Connecting node Opv, OpvConnect diode DpvAnode and IGBT(Spv) collector, IGBT(Spv) emitter connect photovoltaic
The negative output terminal of the busbar connector of array and the cathode of emergency power supply common DC bus, diode DpvCathode connect emergency power supply
The anode of common DC bus.
Isolated form DC-DC current transformer is using double half-bridge converters (dual half bridge, DHB)；First isolated form
Among DC-DC current transformer and the second isolated form DC-DC current transformer respectively by high frequency transformer be isolated, power can two-way flow,
It is emergency power supply direct current common bus that it, which is inputted, and output is separately connected 1 section and 2 sections of DC bus.
Shown in Fig. 4, double half-bridge converters include 4 MOSFET(SD1- SD4), 4 capacitor (CD1- CD4), 1 inductance
LDWith 1 high frequency transformer TD.Emergency power supply direct current common bus side MOSFET is SD1And SD2, SD1The pole D be connected to common bus
Anode, SD1The pole S be connected to SD2The pole D, form neutral point OD1, SD1The pole S be connected to the cathode of common bus；CD1A termination
To the anode of common bus, CD1Another be connected to CD2One end, form neutral point OD2, CD2Another be connected to common bus
Cathode； OD1It is connected to inductance LDOne end, LDAnother be connected to high frequency transformer TDOne end of primary side, TDThe other end of primary side
It is connected to OD2.1 section or 2 sections side MOSFET of DC bus are SD3And SD4。SD3The pole D be connected to 1 section or 2 sections of DC bus of anode,
SD3The pole S be connected to SD4The pole D, form neutral point OD3, SD4The pole S be connected to 1 section or 2 sections of DC bus of cathode；CD3One end
It is connected to 1 section or 2 sections of DC bus of anode, CD3Another be connected to CD4One end, form neutral point OD4, CD4Another termination
To 1 section or 2 sections of cathode of DC bus； OD3It is connected to high frequency transformer TDThe one end on secondary side, TDThe another of secondary side be connected to
OD4。SD1And SD2Driving pulse be square wave, and complementary, SD3And SD4Driving pulse be also square wave, and complementary, SD1And SD3Arteries and veins
There is certain phase shifting angle between punching, for controlling delivering power.
As shown in Fig. 5 ~ Figure 10, there are mainly five types of energy flow modes for emergency power supply of the invention.
Fig. 5 provides electric energy for photovoltaic, first by BOOST circuit transmission electric energy to emergency power supply direct current common bus, so
The electric energy inversion feedback communication bus is used for substation's AC load by DC-AC inverter afterwards.
Fig. 6 also provides electric energy for photovoltaic, transmits electric energy to emergency power supply direct current common bus by BOOST circuit first,
Then the electric energy is supplied to by DC bus by isolation DC-DC current transformer, loads and uses for transforming plant DC.
Fig. 7 provides electric energy for ac bus, is rectified into emergency power supply direct current common bus electricity by DC-AC inverter first
Can, the electric energy is then supplied to by DC bus by isolation DC-DC current transformer, loads and uses for transforming plant DC.
Fig. 8 is that ac bus and photovoltaic provide electric energy jointly, passes through DC-AC inverter rectification and photovoltaic BOOST electricity first
Electric energy is transmitted to emergency power supply direct current common bus in road, and the electric energy is then supplied to direct current mother by isolation DC-DC current transformer
Line is loaded for transforming plant DC and is used.
Fig. 9 and Figure 10 is battery discharge, is switched first by circuit, and isolation DC-DC current transformer is reversely defeated by battery power
It send to emergency power supply direct current common bus, then by DC-AC inverter by the electric energy inversion feedback communication bus, for substation
AC load uses.
To realize above-mentioned function, double power supply converting switch control unit directly measure two sections of ac bus voltage Vac1 with
Vac2 selects the ac bus section of investment to put into ac bus 1 if two sections of ac bus have electricity according to voltage condition
Section, otherwise then puts into the ac bus section of electrification, if two sections of ac bus are all out of power, send out alarm signal immediately and starts light
Lie prostrate powering mode, such as Fig. 6.
As shown in figure 11, the control of emergency power supply includes initialization starting, protection and the control of each module, core control stream
Journey includes the following steps:
1) each road voltage and current information is collected, preliminary signal filtering and over-voltage over-current protection judgement are completed；
2) photovoltaic module is realized according to the voltage Vpv of photovoltaic array, electric current Ipv and emergency power supply direct current common bus voltage Vdc
MPPT is adjusted, and controls BOOST pwm pulse, and photovoltaic array is incorporated to DC link by maximal power tracing power generation；
3) two isolation DC-DC current transformers use output voltage closed loop control mode, the electricity measured according to respective DC bus section
Pressure value calculates the pwm pulse of power device, maintains the stabilization of two sections of DC bus-bar voltages Vdc1 and Vdc2；
4) the core cell DC-AC inverter of emergency power supply uses the two close cycles mode of DC voltage outer ring current inner loop, control
The energy of emergency power supply direct current common bus is balanced, maintains emergency power supply direct current common bus voltage Vdc to stablize, according to voltage
Automatic realization energy multi-direction transmission.
When if necessary to battery discharge, start interrupt routine first, and switching output end open circuit is instructed according to discharge battery
Then device position requires to control corresponding isolation DC-DC current transformer back discharge power according to battery discharge curve, until completing
The verifying of battery pack.For the electric discharge for being easy to implement battery, as shown in figure 12, also incidentally access is additional for isolation DC-DC current transformer
Battery discharge branch realize that DC bus passes through charger power supply and battery by the switching of dc circuit breaker K1 and K2
Emergency set inversely discharges through the invention, and as shown in Figure 9 and Figure 10, energy is finally incorporated to substation's ac bus.
Above-mentioned emergency power supply makes full use of idle roof of transformer substation to carry out photovoltaic power generation, and it is female can to extend substation's exchange
Battery is held time under line all power-off conditions, is reduced substation's entirety power loss phoenix danger, is effectively controlled operating cost；Also
The experiment of battery automatic discharging, and discharge energy feedback communication bus may be implemented, loss is low, is very suitable for transforming plant DC and answers
It is anxious to ensure field.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of transformer station direct current system emergency power supply spare based on photovoltaic, it is characterised in that: handed over comprising two sections with substation
The double power supply converting switch of bus connection is flowed, DC-AC inverter, photovoltaic DC-DC current transformer and two are connected to change
The isolated form DC-DC current transformer of two sections of power station DC bus；
Two sections of ac bus are set to No. 1 ac bus and No. 2 ac bus；
No. 1 ac bus of first power port docking station of double power supply converting switch, second power supply port docking station is with 2
The output port connection DC-AC inverter of number ac bus, double power supply converting switch exchanges side.
2. the transformer station direct current system emergency power supply spare based on photovoltaic according to claim 1, it is characterised in that: described
DC-AC inverter uses PWM converter, the output port of the exchange side connection double power supply converting switch of DC-AC inverter, DC-
The DC side of AC inverter connects emergency power supply direct current common bus.
3. the transformer station direct current system emergency power supply spare based on photovoltaic according to claim 1, it is characterised in that: described
Photovoltaic DC-DC current transformer is a non-isolated BOOST circuit, the busbar connector output of input connection photovoltaic array, output end
Connect emergency power supply direct current common bus.
4. the transformer station direct current system emergency power supply spare based on photovoltaic according to claim 1, it is characterised in that: two
Isolated form DC-DC current transformer is respectively the first isolated form DC-DC current transformer and the second isolated form DC-DC current transformer, the first isolation
Type DC-DC current transformer and the second isolated form DC-DC current transformer are two two-way double semibridge system current transformers, and centre passes through high frequency respectively
Transformer isolation, power can two-way flow, input be emergency power supply direct current common bus, output be separately connected DC bus 1
Section and 2 sections.
5. a kind of control mode of transformer station direct current system emergency power supply spare based on photovoltaic described in claim 1, special
Sign is, specifically includes:
1) when station is operated normally with ac bus, the electric energy that photovoltaic array provides is straight by BOOST circuit inflow emergency power supply
Common bus is flowed, is then exported by DC-AC inverter, ac bus is imported using double power supply converting switch, gives substation
AC load power supply；
2) when station is all stopped transport with ac bus, the electric energy that photovoltaic array provides flows into emergency power supply direct current by BOOST circuit
Common bus gives transforming plant DC load supplying, reduces only battery then by two isolated form DC-DC current transformer outputs
Probability of malfunction when power supply；
3) when station is all damaged with charger, the electric energy that photovoltaic array provides flows into emergency power supply direct current public affairs by BOOST circuit
Common bus gives transforming plant DC load supplying then by two isolated form DC-DC current transformer outputs；If photovoltaic array is not
It can power, DC-AC inverter stablizes emergency power supply direct current common bus from ac bus rectisorption electric energy, then passes through two
A isolated form DC-DC current transformer output, gives transforming plant DC load supplying, reduces probability of malfunction when only storage battery power supply；
4) when battery needs to carry out discharge test, without carrying out discharge load wiring process, emergency need to only be sent instructions to
Power supply, power supply first passes through dc circuit breaker switching and realizes battery access isolated form DC-DC current transformer, then passes through isolated form DC-DC
Current transformer reverse feeding is to emergency power supply direct current common bus, then by exporting by DC-AC inverter, finally by double electricity
Source switching switch imports ac bus, powers to substation's AC load, and battery discharge experiment is able to achieve by certain time.
6. a kind of control mode of transformer station direct current system emergency power supply spare based on photovoltaic according to claim 5,
It is characterized in that, emergency power supply detects the voltage of transforming plant DC bus immediately, when DC bus in the control mode
When section voltage is lower than certain threshold value, the operation of automatic trigger isolated form DC-DC current transformer ensures the stabilization of DC voltage.
7. a kind of control method of transformer station direct current system emergency power supply spare based on photovoltaic described in claim 1, special
Sign is, includes the following steps:
1) each road voltage and current information is collected, preliminary signal filtering and over-voltage over-current protection judgement are completed；
2) photovoltaic module is realized according to the voltage Vpv of photovoltaic array, electric current Ipv and emergency power supply direct current common bus voltage Vdc
MPPT is adjusted, and controls BOOST pwm pulse, and photovoltaic array is incorporated to DC link by maximal power tracing power generation；
3) two isolation DC-DC current transformers use output voltage closed loop control mode, the electricity measured according to respective DC bus section
Pressure value calculates the pwm pulse of power device, maintains the stabilization of two sections of DC bus-bar voltages Vdc1 and Vdc2；
4) the core cell AC-DC inverter of emergency power supply uses the two close cycles mode of DC voltage outer ring current inner loop, control
The energy of emergency power supply direct current common bus is balanced, maintains emergency power supply direct current common bus voltage Vdc to stablize, according to voltage
Automatic realization energy multi-direction transmission.
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| CN201910258002.3A CN109950969B (en) | 2019-04-27 | 2019-04-27 | Transformer substation direct current system emergency power supply based on photovoltaic standby |
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| CN201910258002.3A CN109950969B (en) | 2019-04-27 | 2019-04-27 | Transformer substation direct current system emergency power supply based on photovoltaic standby |
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Cited By (6)
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| CN110417081A (en) * | 2019-07-09 | 2019-11-05 | 华为技术有限公司 | Power supply circuit and uninterruption power source ups system |
| CN111262271A (en) * | 2020-01-22 | 2020-06-09 | 宁波锦浪新能源科技股份有限公司 | Low-cost communication system with multiple energy storage inverters connected in parallel |
| CN112448470A (en) * | 2020-11-18 | 2021-03-05 | 山西和瑞电力科学技术研究院股份有限公司 | Quick response power plant security system integrating comprehensive energy utilization |
| CN112671016A (en) * | 2020-10-19 | 2021-04-16 | 平高集团储能科技有限公司 | Mobile energy storage system based on modularization |
| CN114791762A (en) * | 2021-01-25 | 2022-07-26 | 百度（美国）有限责任公司 | Renewable energy system for data center based on current detection |
| CN114825313A (en) * | 2022-03-03 | 2022-07-29 | 青岛阳浦智能科技有限公司 | Topological structure of ship piezoelectric power system |
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| CN112671016A (en) * | 2020-10-19 | 2021-04-16 | 平高集团储能科技有限公司 | Mobile energy storage system based on modularization |
| CN112671016B (en) * | 2020-10-19 | 2023-08-25 | 平高集团储能科技有限公司 | Mobile energy storage system based on modularization |
| CN112448470A (en) * | 2020-11-18 | 2021-03-05 | 山西和瑞电力科学技术研究院股份有限公司 | Quick response power plant security system integrating comprehensive energy utilization |
| CN114791762A (en) * | 2021-01-25 | 2022-07-26 | 百度（美国）有限责任公司 | Renewable energy system for data center based on current detection |
| CN114825313A (en) * | 2022-03-03 | 2022-07-29 | 青岛阳浦智能科技有限公司 | Topological structure of ship piezoelectric power system |
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