CN107222029B - Combined modularized mobile energy storage system - Google Patents
Combined modularized mobile energy storage system Download PDFInfo
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- CN107222029B CN107222029B CN201710661944.7A CN201710661944A CN107222029B CN 107222029 B CN107222029 B CN 107222029B CN 201710661944 A CN201710661944 A CN 201710661944A CN 107222029 B CN107222029 B CN 107222029B
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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
- H02J15/00—Systems for storing electric energy
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
According to the combined type modularized mobile energy storage system provided by the embodiment of the invention, the energy storage system in the system adopts a modularized design, a single topological structure module or a plurality of topological structure modules can be independently connected in parallel to the system to form an EPS emergency power supply, when the power grid fault or the poor voltage quality is detected and the load requirement cannot be met, the static switch is automatically and rapidly opened, and at the moment, the system is converted from grid connection to island operation, 380V/50Hz alternating current is provided for the load, and the load power supply is ensured. The topological structure modules can also form a mobile energy storage system connected in series by the interconnection of the direct current buses, and are connected in series between a power supply and a load to form an online UPS uninterrupted power supply, when a power grid fails, the power grid voltage is automatically detected, a static switch is timely judged and disconnected to form an island, and then a DC/DC converter is turned on to supply power for the load uninterruptedly. The invention can greatly improve the adaptability of the parallel mobile energy storage system and reduce the cost of the online mobile UPS.
Description
Technical Field
The invention relates to the technical field of mobile energy storage systems, in particular to a combined modularized mobile energy storage system.
Background
With the increasing dependence of modern society on electric power energy, the demand of electricity is rapidly increased, the demand of electricity supply quality is higher and higher, sudden power failure inevitably causes damage to the normal living order of people and the normal operation of society, and particularly for the load of special importance in primary load, once the power supply is interrupted, great political influence or economic loss can be caused. As the main strength of the power grid emergency power supply equipment, the mobile energy storage power supply system has the advantages of flexibility, mature technology, quick starting and the like, and plays a remarkable role in political electricity conservation, urban power grid emergency, temporary electricity utilization in the areas with serious natural disasters and power shortage and the like.
The diesel generator is generally used as an emergency power supply, but the starting time of the diesel generator is 5-30 seconds, the power supply voltage and frequency are high in fluctuation and low in efficiency, the diesel generator can only be used as a main power supply to operate in an off-grid state, seamless switching cannot be achieved, and environmental and noise pollution is inevitably caused by the use of diesel generators. Some institutions have developed and applied mobile high-capacity energy storage systems as emergency power sources, and most of the institutions are mainly demonstrated. The system has short starting time, is mostly in millisecond level, and can realize seamless switching of two running modes of on-line and off-line. Meanwhile, the mobile high-capacity energy storage system can be used as a power supply and can interact with a power distribution network, is charged in the low electricity consumption period and is discharged in the high electricity consumption period, so that the purposes of peak clipping and valley filling, improving the quality of electric energy, integrating and fully utilizing the electric energy and relieving the power supply pressure in the high electricity consumption period are achieved, and the mobile high-capacity energy storage system has a wide application prospect.
The existing mobile energy storage systems can be divided into two main types according to the structure: a parallel mobile energy storage system and a series mobile energy storage system. The first type is in the form of a single DC/AC converter, the energy storage medium is connected with the grid through the DC/DC converter and the DC/AC converter, and the energy storage system is connected to an alternating current bus in parallel, so that the energy storage system can be regarded as an EPS (Emergency Power Supply, emergency power supply and emergency power supply), the response time is generally 0.1 to 2 seconds, and the requirement of uninterrupted load cannot be met. The other type is a double DC/AC back-to-back converter structure, an energy storage medium is connected to a DC/AC direct current side through DC/DC, the system is connected in series to a power grid, the system can be regarded as UPS (Uninterruptible Power System/Uninterruptible Power Supply, uninterruptible power supply), the general response time of the equipment is less than 10ms, the requirement of sensitive load can be met, but the equipment has high cost, high operation loss and can only be applied to a single scene of important load guarantee power supply, and the equipment is always idle and wasted.
Therefore, the existing mobile energy storage systems have single application scene and high cost, and are technical problems to be solved by the technicians in the field.
Disclosure of Invention
The embodiment of the invention provides a combined modularized mobile energy storage system, which is used for solving the technical problems of single application scene and high cost of the existing mobile energy storage system.
The embodiment of the invention provides a combined modularized mobile energy storage system, which comprises: two or more topology modules;
the topological structure module comprises a static switch SS, a switch S0.1, a switch S0.2, a switch S0.3, a DC/AC converter, a DC/DC converter, an energy storage medium and a direct current bus;
the second end of the static switch SS is connected with one end of the first DC/AC converter through the switch S0.3, the other end of the first DC/AC converter is connected with the direct current bus through the switch S0.2, the direct current bus is connected with one end of the first DC/DC converter, the other end of the first DC/DC converter is connected with the energy storage medium, and the direct current bus is connected with the direct current connecting end of the topological structure module through the switch S0.1;
the second terminal of the static switch SS of one of the topology modules is connected to the first terminal of the static switch SS of the other topology module.
Preferably, each topological structure module further comprises a battery management system and an intelligent monitoring system;
the battery management system is connected with the energy storage medium;
the intelligent monitoring system is connected with the static switch SS, the switch S0.1, the switch S0.2, the switch S0.3, the DC/AC converter, the DC/DC converter and the battery management system;
the intelligent monitoring systems arranged on the different topological structure modules are mutually connected.
Preferably, a first end of the static switch SS of the first topology module is connected to the ac power grid, and a second end of the static switch SS of the last topology module is connected to the load.
Preferably, the two or more topological structure modules are specifically two topological structure modules, namely a first module and a second module;
the first module comprises a static switch SS1.1, a switch S1.2, a switch S1.3, a first DC/AC converter, a first DC/DC converter, a super capacitor and a direct current bus;
the second end of the static switch SS1.1 is connected with one end of the first DC/AC converter through the switch S1.3, the other end of the first DC/AC converter is connected with the direct current bus through the switch S1.2, the direct current bus is connected with one end of the first DC/DC converter, the other end of the first DC/DC converter is connected with the supercapacitor, and the direct current bus is connected with the direct current connecting end of the first module through the switch S1.1;
the second module comprises a static switch SS2.1, a switch S2.2, a switch S2.3, a second DC/AC converter, a second DC/DC converter, a battery and a direct current bus;
the second end of the static switch SS2.1 is connected with one end of the second DC/AC converter through the switch S2.3, the other end of the second DC/AC converter is connected with the direct current bus through the switch S2.2, the direct current bus is connected with one end of the second DC/DC converter, the other end of the second DC/DC converter is connected with the battery, and the direct current bus is connected with the direct current connection end of the second module through the switch S2.1;
the second terminal of the static switch SS1.1 is connected to the first terminal of the static switch SS 2.1.
Preferably, the embodiment of the invention further comprises a first battery management system, a first intelligent monitoring system, a second battery management system and a second intelligent monitoring system;
the first battery management system is connected with the super capacitor;
the first intelligent monitoring system is connected with the static switch SS1.1, the switch S1.2, the switch S1.3, the first DC/AC converter, the first DC/DC converter and the first battery management system;
the second battery management system is connected with the battery;
the second intelligent monitoring system is connected with the static switch SS2.1, the switch S2.2, the switch S2.3, the second DC/AC converter, the second DC/DC converter and the second battery management system;
the first intelligent monitoring system is connected with the second intelligent monitoring system.
Preferably, a first end of the static switch SS1.1 is connected to the ac power grid, and a second end of the static switch SS2.1 is connected to the load.
The embodiment of the invention provides another combined modularized mobile energy storage system, which comprises a third module and a fourth module;
the third module comprises a static switch SS3.1, a switch S3.2, a switch S3.3, a third DC/AC converter, a third DC/DC converter, a super capacitor and a direct current bus;
the second end of the static switch SS3.1 is connected with one end of the third DC/AC converter through the switch S3.3, the other end of the third DC/AC converter is connected with the direct current bus through the switch S3.2, the direct current bus is connected with one end of the third DC/DC converter, the other end of the third DC/DC converter is connected with the supercapacitor, and the direct current bus is connected with the direct current connecting end of the third module through the switch S3.1;
the fourth module comprises a static switch SS4.1, a switch S4.2, a switch S4.3, a fourth DC/AC converter, a fourth DC/DC converter, a battery and a DC bus;
the fourth end of the static switch SS4.1 is connected to one end of the fourth DC/AC converter through the switch S4.3, the other end of the fourth DC/AC converter is connected to the DC bus through the switch S4.2, the DC bus is connected to one end of the fourth DC/DC converter, the other end of the fourth DC/DC converter is connected to the battery, and the DC bus is connected to the DC connection end of the fourth module through the switch S4.1;
the direct current connecting end of the third module is connected with the direct current connecting end of the fourth module.
Preferably, the embodiment of the invention further comprises a third battery management system, a third intelligent monitoring system, a fourth battery management system and a fourth intelligent monitoring system;
the third battery management system is connected with the super capacitor;
the third intelligent monitoring system is connected with the static switch SS3.1, the switch S3.2, the switch S3.3, the third DC/AC converter, the third DC/DC converter and the third battery management system;
the fourth battery management system is connected with the battery;
the fourth intelligent monitoring system is connected with the static switch SS4.1, the switch S4.2, the switch S4.3, the fourth DC/AC converter, the fourth DC/DC converter and the fourth battery management system;
the third intelligent monitoring system is connected with the fourth intelligent monitoring system.
Preferably, a first terminal of the static switch SS3.1 is connected to the ac power grid, and a second terminal of the static switch SS4.1 is connected to the load.
Preferably, the method comprises the steps of,
during normal operation, the super capacitor of the third module and the battery of the fourth module are in a state that the SOC is more than 80%, the third DC/DC converter and the fourth DC/DC converter are closed, at the moment, the power grid is rectified into direct current through the third module at first, and the fourth module inverts 380V/50Hz alternating current to supply load;
when the power grid fails, the third module timely judges and cuts off the static switch SS3.1 through detecting the power grid voltage to form an island, then the third DC/DC converter and the fourth DC/DC converter are opened, the super capacitor of the third module responds faster and rapidly to supply power to a load to form a stable alternating voltage in a short time, and the lithium battery of the fourth module has larger capacity to supply power to the load for a longer time.
From the above technical solutions, the embodiment of the present invention has the following advantages:
according to the combined type modularized mobile energy storage system provided by the embodiment of the invention, the energy storage system in the system adopts a modularized design, a single topological structure module or a plurality of topological structure modules can be independently connected in parallel to the system to form an EPS emergency power supply, when the power grid fault or the poor voltage quality is detected and the load requirement cannot be met, the static switch is automatically and rapidly opened, and at the moment, the system is converted from grid connection to island operation, 380V/50Hz alternating current is provided for the load, and the load power supply is ensured. The topological structure modules can also form a mobile energy storage system connected in series by the interconnection of the direct current buses, and are connected in series between a power supply and a load to form an online UPS uninterrupted power supply, when a power grid fails, the power grid voltage is automatically detected, a static switch is timely judged and disconnected to form an island, and then a DC/DC converter is turned on to supply power for the load uninterruptedly. The invention can greatly improve the adaptability of the parallel mobile energy storage system and reduce the cost of the online mobile UPS.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of a modular mobile energy storage system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a topology module in a modular mobile energy storage system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a modular mobile energy storage system control strategy according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second embodiment of a modular mobile energy storage system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another embodiment of a modular mobile energy storage system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another modular mobile energy storage system control strategy according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a combined modularized mobile energy storage system, which is used for solving the technical problems of single application scene and high cost of the existing mobile energy storage system.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, in a first embodiment of a combined modular mobile energy storage system according to an embodiment of the present invention, a topology module is connected in parallel to a power grid system to form an EPS emergency power supply, including: two or more topology modules;
the topological structure module comprises a static switch SS, a switch S0.1, a switch S0.2, a switch S0.3, a DC/AC converter, a DC/DC converter, an energy storage medium 002 and a direct current bus;
the second end of the static switch SS is connected with one end of a first DC/AC converter through a switch S0.3, the other end of the first DC/AC converter is connected with a direct current bus through a switch S0.2, the direct current bus is connected with one end of the first DC/DC converter, the other end of the first DC/DC converter is connected with an energy storage medium 002, and the direct current bus is connected with a direct current connecting end of the topological structure module through a switch S0.1;
the second terminal of the static switch SS of one topology module is connected to the first terminal of the static switch SS of the other topology module.
Each topology module further comprises a battery management system BMS and an intelligent monitoring system 001;
the battery management system BMS is connected with the energy storage medium 002;
the intelligent monitoring system 001 is connected with the static switch SS, the switch S0.1, the switch S0.2, the switch S0.3, the DC/AC converter, the DC/DC converter and the battery management system BMS;
the intelligent monitoring systems 001 arranged on the modules with different topological structures are mutually connected.
The first end of the static switch SS of the first topology module is connected to the ac power grid and the second end of the static switch SS of the last topology module is connected to the load 003.
In normal operation, the static switch SS in each topology module is closed, the switches S0.2 and S0.3 in each topology module are closed, and the switches S0.1 in each topology module are closed.
In fig. 1, 001 denotes an intelligent monitoring system, 002 denotes an energy storage medium, 003 denotes a load, BMS denotes a battery management system, DC/DC denotes a DC/DC converter, the structure between the switch S0.2 and the switch S0.3 is a DC/AC converter, two large dashed boxes on the left and right are two topological modules as an example, and four points in the middle denote that a plurality of topological modules are omitted from the middle.
The combined type modularized mobile energy storage system provided by the embodiment of the invention comprises topological structure modules, wherein each topological structure module is connected through a static switch to form a parallel structure, and the parallel structure can be used as an EPS emergency power supply, when the combined type modularized mobile energy storage system detects that the power grid fault or the poor voltage quality can not meet the load demand, the static switch is automatically and rapidly opened, and at the moment, the system is converted into island operation from grid connection, 380V/50Hz alternating current is provided for a load, and the load power supply is ensured.
According to the combined type modularized mobile energy storage system provided by the embodiment of the invention, the energy storage system in the system adopts a modularized design, a single topological structure module or a plurality of topological structure modules can be independently connected in parallel to the system to form an EPS emergency power supply, when the power grid fault or the poor voltage quality is detected and the load requirement cannot be met, the static switch is automatically and rapidly opened, and at the moment, the system is converted from grid connection to island operation, 380V/50Hz alternating current is provided for the load, and the load power supply is ensured.
Referring to fig. 2, the topology module is actually a bidirectional three-phase bridge converter topology with a dc output interface, as shown in fig. 2. The direct-current side energy storage medium is provided with a Bi Buck-Boost bidirectional DC/DC circuit which is in parallel connection with a DC/AC direct-current side capacitor for operation.
The bidirectional DC/DC circuit has the functions of converting and regulating voltage, and can realize bidirectional energy flow and realize super capacity and charge and discharge operation of the lithium battery. Two energy storage elements with different terminal voltages are connected through the direct-current control device, each energy storage device is directly controlled, and meanwhile, the direct-current bus voltage is kept constant; the charge and discharge curve of the lithium battery can be optimized, and the service life of the lithium battery can be prolonged; the lithium battery and the super capacitor can be deeply discharged, so that the stored energy of the lithium battery and the super capacitor can be fully utilized; the use of DC/DC may also allow for more flexible configuration of the energy management system. The alternating current side is provided with a three-phase static switch, so that the power supply or load (the wiring mode can be the power supply side or the load side) can be rapidly switched on or switched off.
The expansion interface is added to the direct current bus, so that the mobile energy storage system can be used as a direct current power supply or a direct current load with adjustable voltage by controlling the DC/DC converter, and can be applied to specific scenes such as direct current distribution network, electric automobile emergency charging and the like; in addition, the multiple modules are connected through an expansion interface and flexibly controlled through a DC/DC converter and a DC/AC converter, so that a back-to-back energy storage system can be formed.
As can be seen in fig. 2, the static switch is of an anti-parallel configuration of (zener) diodes.
The adoption of the topological structure can realize the application of the mobile energy storage system in multiple scenes of power distribution and utilization. The system is mainly used as a multi-module formed parallel type mobile energy storage system (a first embodiment and a second embodiment) and a dual-module formed serial type mobile energy storage system (UPS) (another embodiment of a combined type modularized mobile energy storage system).
Each topological structure module is connected in parallel on the alternating current bus, and the system can realize multi-scene application according to requirements:
1. as an EPS emergency power supply. When the modularized energy storage system detects that the power grid fault or the poor voltage quality can not meet the load requirement, the static switch SS (the static switch SS connected with the alternating current power grid) of the first topological structure module is automatically and rapidly opened, and at the moment, the system is converted into island operation from grid connection. The multi-module is immediately changed from a PQ current source grid-connected operation mode to a V/F voltage source operation mode, 380V/50Hz alternating current is provided for a load, and the power supply of the load is ensured. However, this mode has a certain switching time (0.1 to 2 seconds), and uninterrupted power supply of an important load cannot be ensured.
2. Can be widely applied to other application scenes. In addition, different application scenes, such as peak clipping and valley filling, time-of-use electricity price, smooth output and the like, can be selected according to requirements. Not described in detail herein.
Referring to fig. 3, a control strategy of a combined modular mobile energy storage system according to an embodiment of the present invention is shown in fig. 3. The system mainly realizes the emergency power supply function of the load, after the system operates, whether the power grid voltage is normal (voltage loss, voltage drop, three-phase unbalance, harmonic wave and the like) is judged through the sensor, and if the power grid state is normal, the SS static switch is closed (the static switch SS connected with the alternating current power grid is closed), so that the grid-connected system is formed.
At this time, according to the detection of the energy storage medium SOC, if it is smaller than 20%, the grid-connected charging mode is entered: the AC/DC converter of the module works in a grid-connected rectification mode, adopts a PQ control strategy, adopts converter output current inner loop control, adopts direct current bus voltage outer loop control, and adopts constant current voltage limiting control when the DC/DC converter works in a Buck state.
If the SOC is greater than 20%, then a discharge mode may be entered: the energy storage device can select various applications according to scenes, firstly, when standby is selected, energy storage is ensured to be in high potential, standby is immediately carried out if the SOC is more than 80%, and a charging mode is entered if the SOC is less than 80%: the AC/DC converter of the module works in a grid-connected rectification mode, adopts a PQ control strategy, adopts converter output current inner loop control, adopts direct current bus voltage outer loop control, and adopts constant current voltage limiting control when the DC/DC converter works in a Buck state.
When other applications except standby are selected, the system calculates an output current instruction value according to an application scene (different scene instruction values), and then enters a grid-connected discharging mode or a grid-connected charging mode according to the instruction system. The grid-connected discharging mode is as follows: the AC/DC works in a grid-connected inversion mode, a PQ control strategy is adopted, the voltage of a direct current bus is outside, the output current is controlled by an inner loop, the DC/DC converter works in a Boost state, and the constant current source is controlled. The grid-connected charging mode is as follows: the AC/DC converter of the module works in a grid-connected rectification mode, adopts a PQ control strategy, adopts converter output current inner loop control, adopts direct current bus voltage outer loop control, and adopts constant current voltage limiting control when the DC/DC converter works in a Buck state.
If the power grid state is abnormal, the SS static switch is opened (the SS static switch connected with the alternating current power grid is opened), and an off-grid system is formed. At this time, the energy storage SOC is detected, and if the SOC is more than 20%, the system enters an off-grid discharging mode: the AC/DC works in an off-grid inversion state, adopts a V/F control strategy, and adopts the outer loop control of the voltage of an alternating current bus and the inner loop control of the current of a direct current bus. If the SOC is less than 20%, the system immediately enters an alarm state and continues to enter an off-grid discharge mode.
The foregoing describes in detail a first embodiment of a modular mobile energy storage system according to an embodiment of the present invention, and the following describes in detail a second embodiment of a modular mobile energy storage system according to an embodiment of the present invention.
Referring to fig. 4, in a second embodiment of a combined modular mobile energy storage system according to the present invention, two topological structure modules are connected in parallel to a power grid system to form an EPS emergency power supply, including: a first module 10 and a second module 20;
the first module 10 comprises a static switch SS1.1, a switch S1.2, a switch S1.3, a first DC/AC converter, a first DC/DC converter, a supercapacitor 101, a direct current bus;
the second end of the static switch SS1.1 is connected with one end of a first DC/AC converter through a switch S1.3, the other end of the first DC/AC converter is connected with a direct current bus through a switch S1.2, the direct current bus is connected with one end of the first DC/DC converter, the other end of the first DC/DC converter is connected with a super capacitor 101, and the direct current bus is connected with the direct current connecting end of the first module 10 through a switch S1.1;
the second module 20 comprises a static switch SS2.1, a switch S2.2, a switch S2.3, a second DC/AC converter, a second DC/DC converter, a battery 202, a direct current bus;
the second end of the static switch SS2.1 is connected with one end of a second DC/AC converter through a switch S2.3, the other end of the second DC/AC converter is connected with a direct current bus through a switch S2.2, the direct current bus is connected with one end of the second DC/DC converter, the other end of the second DC/DC converter is connected with a battery 202, and the direct current bus is connected with a direct current connecting end of the second module 20 through a switch S2.1;
the second terminal of the static switch SS1.1 is connected to the first terminal of the static switch SS 2.1.
The embodiment of the invention further comprises a first battery management system 10BMS, a first intelligent monitoring system 101, a second battery management system 20BMS and a second intelligent monitoring system 201;
the first battery management system 10BMS is connected to the super capacitor 102;
the first intelligent monitoring system 101 is connected with the static switch SS1.1, the switch S1.2, the switch S1.3, the first DC/AC converter, the first DC/DC converter and the first battery management system 10 BMS;
the second battery management system 20BMS is connected to the battery 202;
the second intelligent monitoring system 201 is connected with the static switch SS2.1, the switch S2.2, the switch S2.3, the second DC/AC converter, the second DC/DC converter and the second battery management system 20 BMS;
the first intelligent monitoring system 101 is interconnected with the second intelligent monitoring system 201.
A first terminal of the static switch SS1.1 is connected to the ac power grid, and a second terminal of the static switch SS2.1 is connected to the load 003.
In normal operation, static switches SS1.1 and SS2.1 are closed, switches S1.2, S2.2, S1.3, S2.3 are closed, and switches S1.1 and S2.1 are closed.
The control strategy of the second embodiment of the combined modular mobile energy storage system provided by the embodiment of the present invention is substantially the same as that of the first embodiment, and will not be described herein.
The second embodiment of a modular mobile energy storage system according to the present invention will be described in detail, and the following describes another embodiment of a modular mobile energy storage system according to the present invention.
Referring to fig. 5, in another embodiment of a combined modular mobile energy storage system provided by the present invention, two topological structure modules are connected in series between a power source and a load to form an online UPS uninterruptible power supply, including a third module 30 and a fourth module 40;
the third module 30 includes a static switch SS3.1, a switch S3.2, a switch S3.3, a third DC/AC converter, a third DC/DC converter, a supercapacitor 302, a DC bus;
the second end of the static switch SS3.1 is connected with one end of a third DC/AC converter through a switch S3.3, the other end of the third DC/AC converter is connected with a direct current bus through a switch S3.2, the direct current bus is connected with one end of the third DC/DC converter, the other end of the third DC/DC converter is connected with the super capacitor 302, and the direct current bus is connected with the direct current connecting end of the third module 30 through a switch S3.1;
the fourth module 40 comprises a static switch SS4.1, a switch S4.2, a switch S4.3, a fourth DC/AC converter, a fourth DC/DC converter, a battery 402, a DC bus;
the fourth end of the static switch SS4.1 is connected with one end of a fourth DC/AC converter through a switch S4.3, the other end of the fourth DC/AC converter is connected with a direct current bus through a switch S4.2, the direct current bus is connected with one end of the fourth DC/DC converter, the other end of the fourth DC/DC converter is connected with a battery 402, and the direct current bus is connected with the direct current connecting end of the fourth module 40 through a switch S4.1;
the dc link of the third module 30 is connected to the dc link of the fourth module 40.
The embodiment of the invention further comprises a third battery management system 30BMS, a third intelligent monitoring system 301, a fourth battery management system 40BMS and a fourth intelligent monitoring system 401;
the third battery management system 30BMS is connected to the super capacitor 302;
the third intelligent monitoring system 301 is connected with the static switch SS3.1, the switch S3.2, the switch S3.3, the third DC/AC converter, the third DC/DC converter and the third battery management system 30 BMS;
the fourth battery management system 40BMS is connected to the battery 402;
the fourth intelligent monitoring system 401 is connected with the static switch SS4.1, the switch S4.2, the switch S4.3, the fourth DC/AC converter, the fourth DC/DC converter and the fourth battery management system 40 BMS;
the third intelligent monitoring system 301 is interconnected with the fourth intelligent monitoring system 401.
A first terminal of the static switch SS3.1 is connected to the ac power grid and a second terminal of the static switch SS4.1 is connected to the load 003.
During normal operation, the super capacitor 302 of the third module 30 and the battery 402 of the fourth module 40 are in a state that the SOC is more than 80%, the third DC/DC converter and the fourth DC/DC converter are closed, at the moment, the power grid is rectified into direct current through the third module 30, and the fourth module 40 inverts 380V/50Hz alternating current to supply load;
when the power grid fails, the third module 30 timely judges and turns off the static switch SS3.1 by detecting the power grid voltage to form an island, then the third DC/DC converter and the fourth DC/DC converter are turned on, the super capacitor 302 of the third module 30 responds to the power supply rapidly to supply power to the load, a stable alternating voltage is formed in a short time, the capacity of the lithium battery 402 of the fourth module 40 is large, and the power supply for a long time is provided for the load.
In normal operation, static switches SS3.1 and SS4.1 are closed, S3.2, S4.2, S3.3, S4.3 are closed, and S3.1 and S4.1 are closed.
The other combined type modularized mobile energy storage system provided by the embodiment of the invention comprises two topological structure modules, wherein the two topological structure modules are connected through a direct current connecting end to form a series structure, when a power grid fails, the power grid voltage is automatically detected, a static switch is timely judged and disconnected to form an island, and then a DC/DC converter is opened to supply power to a load. The topological structure modules are connected in series through direct current buses to form a mobile energy storage system, the mobile energy storage system is connected in series between a power supply and a load to form an online UPS uninterrupted power supply, when a power grid fails, the power grid voltage is automatically detected, a static switch is timely judged and disconnected to form an island, and then a DC/DC converter is turned on to supply power to the load uninterruptedly. The invention can greatly improve the adaptability of the parallel mobile energy storage system and reduce the cost of the online mobile UPS.
The dc-side expansion structures (dc link ends) of the third module 30 and the fourth module 40 are specifically connected by dc wheels.
At this time, the two modules form a back-to-back converter, the energy storage medium is connected in parallel to a direct current bus of the back-to-back converter through the DC/DC converter, and the system is connected in series between a power grid and an important load to form an online UPS.
During normal operation, the super capacitor 302 of the third module 30 and the battery 402 of the fourth module 40 are in a state of SOC >80%, DC/DC is turned off, at this time, the power grid is rectified into direct current through the third module 30, and the fourth module 40 inverts 380V/50Hz alternating current to supply the load. When the power grid fails, the third module 30 timely judges and turns off the static switch SS3.1 by detecting the power grid voltage to form an island, then the DC/DC is turned on, the super capacitor 302 of the third module 30 responds to the power supply to the load quickly and quickly, a stable alternating voltage is formed in a short time, the lithium battery 402 of the fourth module 40 has larger capacity, and the power supply is provided for the load for a longer time.
Under the operation mode, the response time of the system is very fast and basically less than 10ms, uninterrupted power supply of important loads can be ensured, and the system can be applied to the scenes of military power conservation, political power conservation, important conferences, important activity power conservation and the like.
The control strategy of the combined modular mobile energy storage system provided by the embodiment of the invention is shown in fig. 6 (the # 1 module in fig. 6 is the third module, and the # 2 module is the fourth module). The system mainly realizes uninterrupted power supply of the load.
Whether the power grid voltage is normal (voltage loss, voltage drop, three-phase unbalance, harmonic wave and the like) is judged through the sensor, and if the power grid state is normal, the third module static switch SS3.1 is closed.
And detecting the energy storage SOC of the third module 30 and the fourth module 40, and entering a grid-connected charging mode if the energy storage SOC is smaller than 80%. The third module AC/DC is in grid-connected rectification mode, the AC/DC adopts a PQ control strategy, the converter outputs current for inner loop control, and the DC bus voltage for outer loop control. The DC/DC converters of the third module and the fourth module work in a Buck mode and are charged in a constant-current voltage-limiting mode. The fourth module AC/DC converter works in an inversion mode and adopts VF control: and (3) outer loop control of alternating current bus voltage and inner loop control of direct current bus current. In this mode of operation, the third AC/DC converter is powered more than the fourth AC/DC converter for charging the stored energy.
If SOC is more than or equal to 80%, the energy storage is at high potential. At this time, the third module AC/DC is in grid-connected rectification mode, the AC/DC converter adopts a PQ control strategy, the converter outputs current for inner loop control, and the DC bus voltage for outer loop control. The AC/DC converter of the fourth module works in an inversion mode, adopts a VF control strategy, adopts an outer loop control of an alternating current bus voltage and adopts an inner loop control of a direct current bus current. The third DC/DC converter and the fourth DC/DC converter are turned off. In this mode of operation, the third AC/DC converter power is equal to the fourth AC/DC converter power for powering the load.
If it is determined that the grid voltage is abnormal, the third module static switch SS3.1 is immediately turned on. At this time, the third AC/DC converter is turned off, the third module DC/DC converter is turned on, the constant current source is controlled, the operation is in Boost state, the fourth module AC/DC operation is continuously operated in inversion mode, and VF control is adopted: the outer loop control of the alternating current bus voltage and the inner loop control of the direct current bus current are utilized, and the characteristic of quick response of the super capacitor of the third module is utilized to quickly invert 380V/50Hz voltage and quickly supply power to the load. And opening a DC/DC converter of the fourth module, controlling a constant current source, operating in a Boost state, putting the lithium battery pack into operation, and providing large-capacity power reserve for a load.
In the working mode, the AC/DC converter of the fourth module always works in the V/F inversion mode, and can continuously and stably provide power for the load, so that the response time is basically less than 10ms, and uninterrupted power supply of the important load can be ensured.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A modular mobile energy storage system comprising: two or more topology modules;
the topological structure module comprises a static switch SS, a switch S0.1, a switch S0.2, a switch S0.3, a DC/AC converter, a DC/DC converter, an energy storage medium and a direct current bus;
the second end of the static switch SS is connected with one end of a first DC/AC converter through the switch S0.3, the other end of the first DC/AC converter is connected with the direct current bus through the switch S0.2, the direct current bus is connected with one end of the first DC/DC converter, the other end of the first DC/DC converter is connected with the energy storage medium, and the direct current bus is connected with the direct current connecting end of the topological structure module through the switch S0.1;
the second terminal of the static switch SS of one of the topology modules is connected to the first terminal of the static switch SS of the other topology module.
2. The modular mobile energy storage system of claim 1, wherein each of the topology modules further comprises a battery management system and an intelligent monitoring system;
the battery management system is connected with the energy storage medium;
the intelligent monitoring system is connected with the static switch SS, the switch S0.1, the switch S0.2, the switch S0.3, the DC/AC converter, the DC/DC converter and the battery management system;
the intelligent monitoring systems arranged on the different topological structure modules are mutually connected.
3. A modular mobile energy storage system as claimed in claim 1, wherein the first end of the static switch SS of the first topology module is connected to an ac power grid and the second end of the static switch SS of the last topology module is connected to a load.
4. The modular mobile energy storage system of claim 1, wherein the two or more topology modules are specifically two topology modules, a first module and a second module;
the first module comprises a static switch SS1.1, a switch S1.2, a switch S1.3, a first DC/AC converter, a first DC/DC converter, a super capacitor and a direct current bus;
the second end of the static switch SS1.1 is connected with one end of the first DC/AC converter through the switch S1.3, the other end of the first DC/AC converter is connected with the direct current bus through the switch S1.2, the direct current bus is connected with one end of the first DC/DC converter, the other end of the first DC/DC converter is connected with the supercapacitor, and the direct current bus is connected with the direct current connecting end of the first module through the switch S1.1;
the second module comprises a static switch SS2.1, a switch S2.2, a switch S2.3, a second DC/AC converter, a second DC/DC converter, a battery and a direct current bus;
the second end of the static switch SS2.1 is connected with one end of the second DC/AC converter through the switch S2.3, the other end of the second DC/AC converter is connected with the direct current bus through the switch S2.2, the direct current bus is connected with one end of the second DC/DC converter, the other end of the second DC/DC converter is connected with the battery, and the direct current bus is connected with the direct current connection end of the second module through the switch S2.1;
the second terminal of the static switch SS1.1 is connected to the first terminal of the static switch SS 2.1.
5. The modular mobile energy storage system of claim 4, further comprising a first battery management system, a first intelligent monitoring system, a second battery management system, a second intelligent monitoring system;
the first battery management system is connected with the super capacitor;
the first intelligent monitoring system is connected with the static switch SS1.1, the switch S1.2, the switch S1.3, the first DC/AC converter, the first DC/DC converter and the first battery management system;
the second battery management system is connected with the battery;
the second intelligent monitoring system is connected with the static switch SS2.1, the switch S2.2, the switch S2.3, the second DC/AC converter, the second DC/DC converter and the second battery management system;
the first intelligent monitoring system is connected with the second intelligent monitoring system.
6. A modular mobile energy storage system as set forth in claim 4, wherein,
a first end of the static switch SS1.1 is connected to the ac power grid, and a second end of the static switch SS2.1 is connected to the load.
7. A modular mobile energy storage system comprising a third module and a fourth module;
the third module comprises a static switch SS3.1, a switch S3.2, a switch S3.3, a third DC/AC converter, a third DC/DC converter, a super capacitor and a direct current bus;
the second end of the static switch SS3.1 is connected with one end of the third DC/AC converter through the switch S3.3, the other end of the third DC/AC converter is connected with the direct current bus through the switch S3.2, the direct current bus is connected with one end of the third DC/DC converter, the other end of the third DC/DC converter is connected with the supercapacitor, and the direct current bus is connected with the direct current connecting end of the third module through the switch S3.1;
the fourth module comprises a static switch SS4.1, a switch S4.2, a switch S4.3, a fourth DC/AC converter, a fourth DC/DC converter, a battery and a DC bus;
the fourth end of the static switch SS4.1 is connected to one end of the fourth DC/AC converter through the switch S4.3, the other end of the fourth DC/AC converter is connected to the DC bus through the switch S4.2, the DC bus is connected to one end of the fourth DC/DC converter, the other end of the fourth DC/DC converter is connected to the battery, and the DC bus is connected to the DC connection end of the fourth module through the switch S4.1;
the direct current connecting end of the third module is connected with the direct current connecting end of the fourth module.
8. The modular mobile energy storage system of claim 7, further comprising a third battery management system, a third intelligent monitoring system, a fourth battery management system, a fourth intelligent monitoring system;
the third battery management system is connected with the super capacitor;
the third intelligent monitoring system is connected with the static switch SS3.1, the switch S3.2, the switch S3.3, the third DC/AC converter, the third DC/DC converter and the third battery management system;
the fourth battery management system is connected with the battery;
the fourth intelligent monitoring system is connected with the static switch SS4.1, the switch S4.2, the switch S4.3, the fourth DC/AC converter, the fourth DC/DC converter and the fourth battery management system;
the third intelligent monitoring system is connected with the fourth intelligent monitoring system.
9. A modular mobile energy storage system as set forth in claim 7, wherein,
a first end of the static switch SS3.1 is connected to the ac power grid, and a second end of the static switch SS4.1 is connected to the load.
10. A modular mobile energy storage system as set forth in claim 7, wherein,
during normal operation, the super capacitor of the third module and the battery of the fourth module are in a state that the SOC is more than 80%, the third DC/DC converter and the fourth DC/DC converter are closed, at the moment, the power grid is rectified into direct current through the third module at first, and the fourth module inverts 380V/50Hz alternating current to supply load;
when the power grid fails, the third module timely judges and cuts off the static switch SS3.1 through detecting the power grid voltage to form an island, then the third DC/DC converter and the fourth DC/DC converter are opened, the super capacitor of the third module responds faster and supplies power to the load rapidly, stable alternating current voltage is formed in a short time, and the fourth module is larger in lithium battery capacity and provides power supply for the load for a long time.
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| CA2958452C (en) | 2016-07-01 | 2022-10-18 | Constance S. Stacey | Modular energy storage systems and related methods |
| WO2019109162A1 (en) * | 2017-12-08 | 2019-06-13 | Constance Stacey | Modular energy storage systems and related methods |
| CN108988332B (en) * | 2018-08-02 | 2020-06-30 | 四川航电微能源有限公司 | Double-bus power supply fast switching device and control method thereof |
| HK1257786A2 (en) * | 2019-01-18 | 2019-10-25 | Astrid Electronics Hk Ltd | Method, apparatus , storage medium and terminal device for quickly switching static transfer switch |
| US11239665B2 (en) * | 2019-02-25 | 2022-02-01 | Eaton Intelligent Power Limited | Grid-edge controllers for uninterruptible power supplies and methods of operating the same |
| CN109755951B (en) * | 2019-03-19 | 2022-07-22 | 南京南瑞继保电气有限公司 | Modular multi-level energy storage system and control method thereof |
| CN110401213A (en) * | 2019-06-26 | 2019-11-01 | 中国电力科学研究院有限公司 | A kind of multi-mode movable energy storage system and its control method |
| CN110649651B (en) * | 2019-09-09 | 2020-12-11 | 珠海格力电器股份有限公司 | Alternating current-direct current bidirectional converter, adaptive method thereof and electronic device |
| CN111224413B (en) * | 2020-03-12 | 2021-09-28 | 国家电网有限公司 | Emergency adjusting system for three-phase electric unbalance |
| CN113787952A (en) * | 2020-05-26 | 2021-12-14 | 广东亿顶新能源汽车有限公司 | Mobile energy storage system suitable for pure electric mobile service vehicle |
| CN112467769A (en) * | 2020-11-23 | 2021-03-09 | 阳光电源股份有限公司 | Modularized pre-installed energy storage system |
| CN113410904B (en) * | 2021-03-29 | 2023-01-24 | 广东电网有限责任公司电力科学研究院 | Multi-module parallel emergency power supply and control method |
| CN113193645B (en) * | 2021-04-22 | 2022-08-09 | 四川荣创新能动力系统有限公司 | Control method of hydrogen fuel cell emergency power supply system |
| CN113437789B (en) * | 2021-08-27 | 2021-11-30 | 南京力骏新能源储能研究院有限公司 | Energy storage system with reconfigurable topology, mobile energy storage shelter and multi-element application method thereof |
| CN114759652B (en) * | 2022-06-15 | 2022-09-06 | 陕西延长石油金石钻采设备有限公司 | Underground power supply system for electric drilling tool |
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