CN106786755A - A kind of energy-storage system and control method - Google Patents

A kind of energy-storage system and control method Download PDF

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Publication number
CN106786755A
CN106786755A CN201611254294.6A CN201611254294A CN106786755A CN 106786755 A CN106786755 A CN 106786755A CN 201611254294 A CN201611254294 A CN 201611254294A CN 106786755 A CN106786755 A CN 106786755A
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CN
China
Prior art keywords
energy
bus
storage
converter
twin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611254294.6A
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Chinese (zh)
Inventor
陈宇航
杨文靖
楼颖焱
花潇
李春艳
桑捷
武罡
郭晋伟
李连更
张世帅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing State Grid Purui UHV Transmission Technology Co Ltd
Taiyuan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Original Assignee
Beijing State Grid Purui UHV Transmission Technology Co Ltd
Taiyuan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing State Grid Purui UHV Transmission Technology Co Ltd, Taiyuan Power Supply Co of State Grid Shanxi Electric Power Co Ltd filed Critical Beijing State Grid Purui UHV Transmission Technology Co Ltd
Priority to CN201611254294.6A priority Critical patent/CN106786755A/en
Publication of CN106786755A publication Critical patent/CN106786755A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • H02S40/32Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • H02S40/38Energy storage means, e.g. batteries, structurally associated with PV modules
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The present invention relates to a kind of energy-storage system and control method, can in time be dissolved the unnecessary electricity produced in photovoltaic generation, in the case of power distribution network scheduled outage and unplanned power failure, energy-storage system can automatic seamless switch to off-network mode of operation, it is ensured that load uninterrupted power supply.The PV arrays that are made up of multiple solar panel parallel connections, photovoltaic DC-to-AC converter, STS intelligently switching cabinet, for by the twin-stage energy accumulation current converter of direct current and alternating current automatic conversion, PC background control systems;PV arrays are by photovoltaic DC-to-AC converter by the DC conversion of generation for alternating current sends bus to, power network is incorporated to bus simultaneously, circuit controling switch is provided between power network and bus, intelligently switching cabinet is located between twin-stage energy accumulation current converter and the grid entry point of bus STS, energy-storage battery is connected with twin-stage energy accumulation current converter, also being accessed in bus has AC load, and PC background control systems are communicated to connect with photovoltaic DC-to-AC converter, twin-stage energy accumulation current converter and circuit controling switch respectively.

Description

A kind of energy-storage system and control method
Technical field
The present invention relates to field of photovoltaic power generation, and in particular to a kind of energy-storage system and control method.
Background technology
Photovoltaic generation is the process for making solar energy be converted into electric energy under certain condition, in conversion process, does not have dirt Dye and noise, therefore the popularization and application as a kind of clean environment firendly and reproducible distributed power generation mode by various countries energetically.Light The volt electric current for producing that generates electricity can not sometimes be dissolved completely, in order to the waste for preventing the energy need to be stored it is standby.But, quilt The electric energy of storage cannot often be utilized in time or re-use it is less efficient.
The content of the invention
It is an object of the invention to provide a kind of energy-storage system and control method, in the photovoltaic generation that can not only dissolve in time Produce unnecessary electricity, meanwhile, in the case of power distribution network scheduled outage and unplanned power failure, energy-storage system can automatic seamless cut Change off-network mode of operation into, it is ensured that load uninterrupted power supply.
A kind of energy-storage system of the invention, including:PV arrays, the photovoltaic inversion being made up of multiple solar panel parallel connections Device, STS intelligently switching cabinet, for by the twin-stage energy accumulation current converter of direct current and alternating current automatic conversion, PC background control systems;
The PV arrays by the photovoltaic DC-to-AC converter by the DC conversion of generation for alternating current sends to the bus, Power network is incorporated to the bus simultaneously, and circuit controling switch is provided between the power network and the bus, and the STS intelligently switches cabinet It is located between the twin-stage energy accumulation current converter and the grid entry point of the bus, energy storage electricity is connected with the twin-stage energy accumulation current converter Pond, also being accessed in the bus has an AC load, the PC background control systems respectively with the photovoltaic DC-to-AC converter, twin-stage energy storage Current transformer and circuit controling switch are communicated to connect.
Further, the photovoltaic DC-to-AC converter is transless inverter.
Further, the PV arrays are located in the containment vessel being made up of low iron glass, and the bottom of the containment vessel is provided with For the PV arrays according to the support frame of sunlight angular turn, the inwall of the containment vessel is provided with high power light source.
Further, the AC load includes being provided to electrokinetic cell the charger of power supply, the PC Background controls system System is communicated to connect with the charger.
Further, the twin-stage energy accumulation current converter includes that high-tension battery group energy accumulation current converter and A-battery group are stored up Can current transformer, wherein, the A-battery group energy accumulation current converter and the one-to-one connection discharge and recharge of the A-battery group.
Further, the internal wiring structure of the STS intelligence switching cabinet includes:EBI, service entrance switch, STS intelligence Cabinet, energy storage service entrance switch, on-load switch and service switch can be switched, the service entrance switch intelligently switches cabinet string with the STS Join and constitute main line, the on-load switch is connected with after energy storage service entrance switch parallel connection with the main line, the service switch Intelligently switching cabinet is in parallel with the STS.
Present invention also offers a kind of control method of energy-storage system, comprise the following steps:
Step 1) DC conversion of generation is and the same width of bus voltage by the PV arrays by the photovoltaic DC-to-AC converter Value, with frequency, send bus to the alternating current of phase, the AC load being connected with the bus is dissolved the alternating current, during unit Interior, the alternating current do not dissolved is converted into direct current and is stored in the energy-storage battery by the twin-stage energy accumulation current converter It is interior;
Step 2) described in the PC background control systems real-time reception photovoltaic DC-to-AC converter transmission current value, and by collection The current value regulate and control the output frequency of the photovoltaic DC-to-AC converter, when the current value in the bus is less than default first threshold During value, the PC background control systems control the circuit controling switch closure, and the power network is cooperateed with to described with PV plate arrays It is bus-powered or independent to described bus-powered from power network;
Step 3) when the charge value of the bus is less than default Second Threshold, intelligently switching cabinet starts institute to the STS State twin-stage energy accumulation current converter and the direct current derivation in the energy-storage battery is converted into the alternating current supply bus.
Further, step 3) in, when the Second Threshold is 0, the twin-stage energy accumulation current converter is automatic by the storage Direct current in energy battery is derived and is converted into the alternating current supply bus;
When the current value in the bus more than AC load dissolve value when, dump energy continue store in the storage In energy battery, the energy-storage battery stops to described bus-powered.
A kind of energy-storage system and control method that the present invention is provided, by many of photovoltaic generation, power network and energy-storage system To bus-powered, to meet the power consumption demand of bus, the bus in the present invention is 380V ac bus to square coordinated.When total When there is the electricity more than needed do not dissolved by AC load in line, directly store standby in energy-storage battery by twin-stage energy accumulation current converter With, the unnecessary electricity produced in the photovoltaic generation that can not only so dissolve in time, meanwhile, in power distribution network scheduled outage and unplanned In the case of power failure, energy-storage system can automatic seamless switch to off-network mode of operation, it is ensured that load uninterrupted power supply.Meanwhile, storage Energy system can also be charged in Pinggu period, and in the peak of power consumption period, by STS, intelligently switching cabinet starts twin-stage energy storage unsteady flow Corona discharge feedback grid in energy-storage battery to reduce fluctuation of the power network in the peak of power consumption period, is reached peak load shifting by device Purpose.
Brief description of the drawings
A kind of block schematic illustration of energy-storage system that Fig. 1 is provided for the present invention;
Fig. 2 for twin-stage energy accumulation current converter in the energy-storage system that provides of the present invention and high-tension battery group and A-battery group it Between annexation schematic diagram;
STS in a kind of energy-storage system that Fig. 3 is provided for the present invention intelligently switches cabinet internal wiring figure.
Specific embodiment
Embodiments of the present invention are illustrated below in conjunction with the accompanying drawings.
A kind of energy-storage system of the invention, as shown in figure 1, including:PV gusts be made up of multiple solar panel parallel connections Row, photovoltaic DC-to-AC converter, STS intelligently switching cabinet, for by after twin-stage energy accumulation current converter, the PC of direct current and alternating current automatic conversion Bench control system;
The PV arrays by the photovoltaic DC-to-AC converter by the DC conversion of generation for alternating current sends to the bus, Power network is incorporated to the bus simultaneously, and circuit controling switch is provided between the power network and the bus, and the STS intelligently switches cabinet It is located between the twin-stage energy accumulation current converter and the grid entry point of the bus, energy storage electricity is connected with the twin-stage energy accumulation current converter Pond, also being accessed in the bus has an AC load, the PC background control systems respectively with the photovoltaic DC-to-AC converter, twin-stage energy storage Current transformer and circuit controling switch are communicated to connect.
Wherein, twin-stage energy accumulation current converter (PCS) is made up of DC/AC two way convertors, control unit etc..PCS controllers lead to Cross communication and receive Background control instruction, symbol and size the control current transformer according to power instruction are charged or put to battery Electricity, realizes the regulation to network re-active power and reactive power.PCS controllers are communicated by CAN interface with BMS, obtain battery Group status information, is capable of achieving the protectiveness discharge and recharge to battery, it is ensured that battery operation safety.
As shown in Fig. 2 in the present invention, the twin-stage energy accumulation current converter for using includes high-tension battery group energy accumulation current converter and low Piezoelectric battery group energy accumulation current converter, wherein, A-battery group energy accumulation current converter and the one-to-one connection of A-battery.For high pressure The PCS of battery pack is model GMPS2-50KS, the PCS models GEatom306KHF of A-battery group.Meanwhile, this pair Level energy accumulation current converter possesses the function and " black starting-up " ability detected to battery system, so in the difference for using not only Battery system testing equipment need not be used alone, meanwhile, it is capable to ensure in unexpected whole grid cut-off, in the short time Interior automatic execution " black starting-up ", it is ensured that the normal operation of circuit.
Photovoltaic DC-to-AC converter is transless inverter.The transless inverter is bipolar ± 600VDC data configurations, Realize directly changing this new technology using separable the two poles of the earth+600 and -600VDC battery packs array, without in low voltage three-phase Transformer is equipped with power network.This configuration not only increases generating efficiency, and need not the traditionally required inversion for using Device transformer, reduces system balancing (BoS) cost of correlation, it is thus also avoided that the unnecessary circuit relevant with monopolar configuration declines Subtract.
As shown in figure 3, it is that STS100K intelligent networks switch cabinet that the STS used in the present invention intelligently switches cabinet.Its internal wiring Structure includes:EBI, service entrance switch, STS intelligently switch cabinet, energy storage service entrance switch, on-load switch and service switch, institute Intelligently switching cabinet is connected and constitutes main line with the STS to state service entrance switch, and the on-load switch is with the energy storage service entrance switch simultaneously Connected with the main line after connection, intelligently switching cabinet is in parallel with the STS for the service switch.
The Main Function of STS be input power all the way break down or need to overhaul, test when realize from power supply all the way Veritably changed incessantly between another road power supply, forbid access two-way to produce the input power of backflow.STS can lead to It is main power source to cross control panel and set wherein any input power all the way, and another road input power is stand-by power supply.Only in master In the case of power failure or hand-reset, STS just can be switched to stand-by power supply in 8ms from main power source automatically.The two-way of STS Static switch is strict interlocking, and manual bypass switch is also equipped with STS, when STS needs maintenance, can manually by input electricity Source is switched to by-pass switch.Can ensure that output is uninterrupted when carrying out manual switch.
The all of conversion of STS is all quick break-before-make, and dash current will not be produced between main power supply, all of Conversion is completed all within the time less than 8ms.
Under normal operating conditions, it is in normal voltage range in main power source, load is connected to main power source always.In master During power failure, load automatic switch to stand-by power supply, after main power source recovers normal, load automatically switches to main electricity again Source.
When the load current of STS sensings exceedes overcurrent value set in advance, dash current or overload are indicated, at this moment Even if main power voltage exceeds normal voltage range, STS does not also change.When load current returns to normal value, mistake Stream suppression mode automatically resets, and STS returns to normal mode of operation.
It is in normal voltage range in backup power source voltage, and phase difference between stand-by power supply and main power source is in and permits Perhaps in the range of.STS can be switched over manually between two-way power supply.In order to the supply of proof load power supply is not interrupted, When loading the power interruptions of connection, STS will be transformed into another road power supply in 8ms automatically.The urgent preferential any conversion of conversion or Person suppresses.
PV arrays by the photovoltaic DC-to-AC converter by the DC conversion of generation be with the same amplitude of bus voltage, with frequency, same The alternating current of phase sends bus to, to bus-powered.
In the system is located at electrical changing station, the load in bus includes charger and other AC loads.When in electricity consumption During peak period, such as commuter time or festivals or holidays, power consumption is more to be changed, it is necessary to carry out electrokinetic cell relatively largely and fill Electricity, now, it is possible to which the generated energy of photovoltaic generation can not completely supply the power consumption of bus, it is necessary to power network is aided in bus simultaneously Power supply, to meet the demand of bus.Now, system is set in STS intelligently switching cabinet, when the current magnitude in bus is less than pre- If specific threshold or during threshold range, intelligently switching cabinet directly carries out circuit conversion to STS, or starts energy-storage system Energy-storage battery to bus-powered, while can also power network assist photovoltaic generation together to bus-powered simultaneously, three-phase circuit is together To bus-powered, to reach the purpose of peak load shifting.
Or when in rainy weather, photovoltaic generation cannot be realized, at this time, it may be necessary to power network is fully relied on to bus-powered, can With set in advance PC background control systems volitional check photovoltaic DC-to-AC converter in rainy weather electric current export maximum, individually by Power network to bus-powered, or, intelligently switching cabinet directly carries out circuit conversion to STS, by starting PCS by depositing in energy-storage battery Reserve of electricity feeds back to bus.
In order to improve reception utilization rate of the solar panel array for sunshine, while solar cell can be protected Plate reduces the erosion and destruction of acid rain or other materials to it, can preferably be located at the PV arrays and is made up of low iron glass Containment vessel in, the bottom of the containment vessel is provided with the support frame according to sunlight angular turn, institute for the PV arrays The inwall for stating containment vessel is provided with high power light source.The high power light source set on inwall ensure that the sun to a certain extent Even if energy cell panel is within the illumination weaker short time, it is also possible to by absorbing heat and then the guarantee one that these light sources are distributed Fixed generated energy, such as ensure the need for electricity of small user.These high power light sources can be lighting device.
The AC load includes being provided to electrokinetic cell the charger of power supply, and the PC background control systems fill with described Its communications are connected.Other AC loads can also be included simultaneously, the alternating current in the bus also can be used.
The present invention also provides a kind of control method of energy-storage system, comprises the following steps:
Step 1) DC conversion of generation is and the same width of bus voltage by the PV arrays by the photovoltaic DC-to-AC converter Value, with frequency, send bus to the alternating current of phase, the AC load being connected with the bus is dissolved the alternating current, during unit Interior, the alternating current do not dissolved is converted into direct current and is stored in the energy-storage battery by the twin-stage energy accumulation current converter It is interior;
Step 2) described in the PC background control systems real-time reception photovoltaic DC-to-AC converter transmission current value, and by collection The current value regulate and control the output frequency of the photovoltaic DC-to-AC converter, when the current value in the bus is less than default first threshold During value, the PC background control systems control the circuit controling switch closure, and the power network is cooperateed with to described with PV plate arrays It is bus-powered or independent to described bus-powered from power network;
Step 3) when the charge value of the bus is less than default Second Threshold, intelligently switching cabinet starts institute to the STS State twin-stage energy accumulation current converter and derive the direct current in the energy-storage battery and be converted into alternating current and supply the bus, in other words when When Second Threshold is 0, the automatic direct current by the energy-storage battery of the twin-stage energy accumulation current converter is derived and is converted into alternating current The bus is supplied, that is, is possessed and is had " black starting-up " function.
When the current value in the bus more than AC load dissolve value when, dump energy continue store in the storage In energy battery, the energy-storage battery stops to described bus-powered.
More than, although several embodiments of the invention is illustrated, but these implementation methods are intended only as example proposition , it is not intended to limit the scope of the present invention.For these new implementation methods, can be implemented in other various modes, Do not departing from the range of idea of the invention, various omissions, displacement and change can carried out.These implementation methods and its change Shape, while being contained in scope and spirit of the present invention, the invention being also contained in described in claims and its impartial model In enclosing.

Claims (8)

1. a kind of energy-storage system, it is characterised in that including:The PV arrays that are made up of multiple solar panel parallel connections, photovoltaic are inverse Become device, STS intelligently switching cabinet, for by the twin-stage energy accumulation current converter of direct current and alternating current automatic conversion, PC Background controls system System;
The PV arrays by the photovoltaic DC-to-AC converter by the DC conversion of generation for alternating current sends to the bus, power network The bus is incorporated to simultaneously, circuit controling switch is provided between the power network and the bus, intelligently switching cabinet is located at the STS Between the twin-stage energy accumulation current converter and the grid entry point of the bus, energy-storage battery is connected with the twin-stage energy accumulation current converter, Also being accessed in the bus has AC load, and the PC background control systems become with the photovoltaic DC-to-AC converter, twin-stage energy storage respectively Stream device and circuit controling switch communication connection.
2. a kind of energy-storage system as claimed in claim 1, it is characterised in that the photovoltaic DC-to-AC converter is transless inversion Device.
3. a kind of energy-storage system as claimed in claim 1, it is characterised in that the PV arrays are located at what is be made up of low iron glass In containment vessel, the bottom of the containment vessel is provided with the support frame for the PV arrays according to sunlight angular turn, described The inwall of containment vessel is provided with high power light source.
4. a kind of energy-storage system as claimed in claim 1, it is characterised in that the AC load includes being provided to electrokinetic cell The charger of power supply, the PC background control systems are communicated to connect with the charger.
5. a kind of energy-storage system as claimed in claim 1, it is characterised in that the twin-stage energy accumulation current converter includes high-tension battery Group energy accumulation current converter and A-battery group energy accumulation current converter, wherein, the A-battery group energy accumulation current converter with it is described The one-to-one connection discharge and recharge of A-battery group.
6. a kind of energy-storage system as claimed in claim 1, it is characterised in that the internal wiring knot of the intelligent switching cabinets of the STS Structure includes:EBI, service entrance switch, STS intelligently switch cabinet, energy storage service entrance switch, on-load switch and service switch, described Service entrance switch with the STS intelligently connect and constitute main line by switching cabinet, and the on-load switch is in parallel with the energy storage service entrance switch Connected with the main line afterwards, intelligently switching cabinet is in parallel with the STS for the service switch.
7. the control method of a kind of energy-storage system according to claim 1, it is characterised in that comprise the following steps:
Step 1) DC conversion of generation is and the same amplitude of bus voltage, same by the PV arrays by the photovoltaic DC-to-AC converter Frequently, bus is sent to the alternating current of phase, the AC load being connected with the bus is dissolved the alternating current, in the unit interval, The alternating current do not dissolved is converted into direct current and is stored in the energy-storage battery by the twin-stage energy accumulation current converter;
Step 2) described in the PC background control systems real-time reception photovoltaic DC-to-AC converter transmission current value, and by gather institute The output frequency that current value regulates and controls the photovoltaic DC-to-AC converter is stated, when the current value in the bus is less than default first threshold When, the PC background control systems control the circuit controling switch closure, and the power network is cooperateed with to described total with PV plate arrays Line is powered or from power network individually to described bus-powered;
Step 3) when the charge value of the bus is less than default Second Threshold, intelligently switching cabinet starts described pair to the STS Direct current in the energy-storage battery is derived and is converted into the alternating current supply bus by level energy accumulation current converter.
8. a kind of control method of energy-storage system as claimed in claim 7, it is characterised in that step 3) in, when described second When threshold value is 0, the automatic direct current by the energy-storage battery of the twin-stage energy accumulation current converter is derived and is converted into alternating current supply The bus;
When the current value in the bus more than AC load dissolve value when, it is electric in the energy storage that dump energy continues storage In pond, the energy-storage battery stops to described bus-powered.
CN201611254294.6A 2016-12-30 2016-12-30 A kind of energy-storage system and control method Pending CN106786755A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN109066753A (en) * 2018-09-28 2018-12-21 燕山大学 A kind of control method and system based on energy-storage battery state-of-charge
CN109546649A (en) * 2018-11-30 2019-03-29 电子科技大学 A kind of fault comprehensive control method of polymorphic power quality controlling device
CN111262141A (en) * 2020-01-20 2020-06-09 山东山大电力技术股份有限公司 Charging station energy storage cabinet and energy storage system

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CN111262141A (en) * 2020-01-20 2020-06-09 山东山大电力技术股份有限公司 Charging station energy storage cabinet and energy storage system

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Application publication date: 20170531