CN117614303A - Flow battery energy storage converter control system and method - Google Patents
Flow battery energy storage converter control system and method Download PDFInfo
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- CN117614303A CN117614303A CN202311648870.5A CN202311648870A CN117614303A CN 117614303 A CN117614303 A CN 117614303A CN 202311648870 A CN202311648870 A CN 202311648870A CN 117614303 A CN117614303 A CN 117614303A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims description 26
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 67
- 229940037003 alum Drugs 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 26
- 229910052720 vanadium Inorganic materials 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 229910001456 vanadium ion Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 101100080277 Caenorhabditis elegans ncr-1 gene Proteins 0.000 description 1
- 101100459404 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) npc-1 gene Proteins 0.000 description 1
- 101100338491 Oryza sativa subsp. japonica HCT1 gene Proteins 0.000 description 1
- 101150028119 SPD1 gene Proteins 0.000 description 1
- 101100495309 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CDH1 gene Proteins 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229940021013 electrolyte solution Drugs 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention provides a flow battery energy storage converter control system, which comprises: an energy storage converter system and a full alum flow battery; the energy storage converter system comprises a direct current power supply lightning arrester, a direct current circuit breaker, a direct current fuse, a bidirectional AC-DC power module, a reactor, an alternating current filter, an alternating current circuit breaker, an alternating current power supply lightning arrester, a direct current voltage sensor, a direct current sensor, an alternating current voltage sensor, an alternating current sensor and a central controller which are sequentially connected, and a DC-DC chopper module and a direct current precharge module which are respectively connected with the direct current circuit breaker in parallel; the central controller is used for driving the DC-DC chopper module and the bidirectional AC-DC power module. The energy storage converter system has the advantages of improving the conversion efficiency of electric energy, reducing the loss of the electric energy, along with simple structure, low cost and convenient maintenance, and has the function of starting the energy storage converter system at the direct current voltage of 0V.
Description
Technical Field
The invention relates to the technical field of battery energy storage, in particular to a flow battery energy storage converter control system and method.
Background
The all-vanadium redox flow battery is a liquid redox renewable battery taking metal vanadium ions as active substances, and is a flow battery. The all-vanadium redox flow battery takes +4 and +5 vanadium ion solutions as active substances of positive electrodes, and +2 and +3 vanadium ion solutions as active substances of negative electrodes, which are respectively stored in corresponding storage tanks, when the battery is charged and discharged, positive and negative electrolyte solutions perform redox reactions on two sides of an ion exchange membrane, and meanwhile, a power pump of the system starts to work, and electrolyte in the liquid storage tank is continuously fed into the positive electrode chamber and the negative electrode chamber so as to maintain the concentration of ions, thereby realizing charge and discharge of the battery. When the electrolyte is replaced, the voltage of the flow battery can be 0V, at the moment, the traditional converter is uncontrollably rectified, equipment can be damaged, the flow battery cannot be directly charged, at the moment, a charger is additionally required to be used for charging the battery, and when the voltage of the battery reaches a working area of the direct current side of the converter, the energy storage converter can charge and discharge the full-alum flow battery. Therefore, an energy storage converter capable of achieving 0V charging is urgently needed in the market.
The above problems are to be solved.
Disclosure of Invention
The present invention overcomes at least one of the above-identified shortcomings of the prior art by providing a flow battery energy storage converter control system comprising: an energy storage converter system and a full alum flow battery; one end of the energy storage converter system is connected with the full-alum flow battery, and the other end of the energy storage converter system is connected with a power grid and is used for charging or discharging the full-alum flow battery based on a received scheduling instruction of the power grid; the energy storage converter system comprises a direct current power supply lightning arrester, a direct current circuit breaker, a direct current fuse, a bidirectional AC-DC power module, a reactor, an alternating current filter, an alternating current circuit breaker, an alternating current power supply lightning arrester, a direct current voltage sensor, a direct current sensor, an alternating current voltage sensor, an alternating current sensor and a central controller which are sequentially connected, and a DC-DC chopper module and a direct current precharge module which are respectively connected with the direct current circuit breaker in parallel; the central controller is configured to drive the DC-DC chopper module and the bi-directional AC-DC power module based on the received battery side voltage, battery side current, bus side voltage, system side current, AC current, and filter current.
Further, the energy storage converter system further comprises an alternating current pre-charging module, one end of the alternating current pre-charging module is connected between the bidirectional AC-DC power module and the direct current fuse, and the other end of the alternating current pre-charging module is connected between the alternating current power supply lightning arrester and the alternating current circuit breaker.
Further, the alternating current precharge module comprises a three-phase rectifier bridge, a first precharge resistor and a first contactor which are sequentially connected; the alternating current pre-charging module is used for pre-charging the bidirectional AC-DC power module through a three-phase rectifier bridge.
Further, the direct current precharge module comprises a second contactor and a second precharge resistor which are sequentially connected; the direct current pre-charging module is used for pre-charging the bidirectional AC-DC power module through the full alum flow battery.
Further, the DC-DC chopper module comprises a third contactor and a DC-DC chopper which are sequentially connected; the DC-DC chopper module is used for converting direct-current high-voltage power input by the bidirectional AC-DC power module into direct-current low-voltage power output to charge the all-vanadium redox flow battery.
Further, the alternating current filter is connected between the bidirectional AC-DC power module and the alternating current fuse, and comprises a reactor and a filter capacitor which are sequentially connected, and the filter capacitor is used for filtering out higher harmonics generated by high-speed switches of the bidirectional AC-DC power module.
Further, the bidirectional AC-DC power module includes an IGBT tube T1, an IGBT tube T2, an IGBT tube T3, an IGBT tube T4, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a DC support capacitor C1, and a DC support capacitor C2; an IGBT tube T1 anti-parallel diode D1, an IGBT tube T2 anti-parallel diode D2, an IGBT tube T3 anti-parallel diode D3, and an IGBT tube T4 anti-parallel diode D4; the IGBT tube T1 is sequentially connected with the IGBT tube T2, the IGBT tube T3 and the IGBT tube T4 in series, and the midpoints of the IGBT tube T1 and the IGBT tube T2 are connected with one ends of a diode D5 and a diode D6 which are connected in series; the middle points of the IGBT tube T3 and the IGBT tube T4 are connected to the other ends of the diode D5 and the diode D6 which are connected in series; the direct current support capacitor C1 and the direct current support capacitor C2 are connected in series, and the midpoint of the direct current support capacitor C1 and the midpoint of the direct current support capacitor C2 are connected to the midpoint of the IGBT tube T2 and the midpoint of the IGBT tube T3 which are connected in series.
Further, the central controller is further configured to drive the bidirectional AC-DC power module and the DC-DC chopper module to charge or discharge the all-vanadium redox flow battery based on the values of the battery side voltage and the preset voltage detected by the received DC voltage sensor.
Further, the central controller is further configured to: when the received battery side voltage is greater than a preset voltage, driving the bidirectional AC-DC power module to charge the all-vanadium redox flow battery; when the received battery side voltage is smaller than a preset voltage, the bidirectional AC-DC power module and the DC-DC chopper module are driven to charge the full-alum flow battery, and when the battery side voltage rises to the preset voltage, the DC-DC chopper module is driven to stop working, so that the bidirectional AC-DC power module continues to charge the full-alum flow battery.
In a second aspect, the invention provides a method for controlling an energy storage converter of a flow battery, which comprises the following steps: in a charging mode, carrying out alternating current precharge on the energy storage converter; the central controller acquires battery side voltage through a direct current side voltage sensor; when the voltage of the battery side is larger than the preset voltage, the central controller drives the bidirectional AC-DC power module to charge the flow battery; when the voltage of the battery side is smaller than the preset voltage, the central controller drives the bidirectional AC-DC power module and the DC-DC chopper module to charge the flow battery; when the voltage of the battery side reaches a preset voltage, the central controller drives the DC-DC chopper module to stop working and drives the bidirectional AC-DC power module to continuously charge the flow battery; in a discharging mode, carrying out direct current precharge on the energy storage converter; the central controller drives the bidirectional AC-DC power module to invert alternating current to discharge outside.
In yet another aspect, the present invention provides a computer readable storage medium, where one or more instructions are stored, where the computer instructions are configured to cause the computer to perform the above-described flow battery energy storage converter control method.
In yet another aspect, the present invention provides an electronic device, including: a memory and a processor; at least one program instruction is stored in the memory; the processor loads and executes the at least one program instruction to realize the flow battery-based energy storage converter control method.
The beneficial effects of the invention are as follows: the invention provides a flow battery energy storage converter control system, which comprises: an energy storage converter system and a full alum flow battery; one end of the energy storage converter system is connected with the full-alum flow battery, and the other end of the energy storage converter system is connected with a power grid and is used for charging or discharging the full-alum flow battery based on a received scheduling instruction of the power grid; the energy storage converter system comprises a direct current power supply lightning arrester, a direct current circuit breaker, a direct current fuse, a bidirectional AC-DC power module, a reactor, an alternating current filter, an alternating current circuit breaker, an alternating current power supply lightning arrester, a direct current voltage sensor, a direct current sensor, an alternating current voltage sensor, an alternating current sensor and a central controller which are sequentially connected, and a DC-DC chopper module and a direct current precharge module which are respectively connected with the direct current circuit breaker in parallel; the central controller is configured to drive the DC-DC chopper module and the bi-directional AC-DC power module based on the received battery side voltage, battery side current, bus side voltage, system side current, AC current, and filter current. Through the parallelly connected DC-DC chopper module of direct current busbar, improved the conversion efficiency of electric energy, reduced the loss of electric energy, simple structure, it is with low costs, be convenient for maintain to make energy storage converter system possess direct current voltage 0V start-up function.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a topology structure of a flow battery energy storage converter control system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a bidirectional AC-DC power module topology according to an embodiment of the present invention.
Fig. 3 is a flowchart of a control method of a flow battery energy storage converter according to an embodiment of the present invention.
Fig. 4 is a partial block diagram of an electronic device provided by an embodiment of the invention.
Detailed Description
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The following appearing technical terms will now be explained for the convenience of subsequent understanding:
energy storage converter: (PCS, power conversion system, also known as bi-directional energy storage inverter), an apparatus capable of playing a critical role in an electrical energy storage system. The device has the function of converting direct-current electric energy generated in the renewable energy power generation process into alternating-current electric energy, and enabling the electric energy to be stored so as to be converted into direct-current electric energy again when needed for power supply. Meanwhile, the energy storage bidirectional converter can rapidly convert stored electric energy into alternating current electric energy when the power grid fails or is powered off, and the alternating current electric energy is provided for a user, so that the continuity and reliability of power supply are ensured.
Example 1
Referring to fig. 1, a schematic diagram of a flow battery energy storage converter control system topology is shown.
As an example, the system comprises: an energy storage converter system 1 and a full alum flow battery; one end of the energy storage converter system 1 is connected to the full alum flow battery, and the other end of the energy storage converter system is connected to a power grid and used for charging or discharging the full alum flow battery based on a received scheduling instruction of the power grid. As shown in fig. 1, the left end of the energy storage converter system is connected to the full alum flow battery, and the right end is connected to the power grid or the right end is connected to the load.
Optionally, the energy storage converter system includes a DC power arrester SPD1, a DC breaker, a DC fuse FU1, a bidirectional AC-DC power module 102, a reactor LC, an AC filter C1-6, an AC breaker QF2, an AC power arrester SPD2, a DC voltage sensor, a DC current sensor HCT1, an AC voltage sensor, an AC current sensor CT1-3, and a central controller, which are sequentially connected, and a DC-DC chopper module 104 and a DC precharge module 103, which are respectively connected in parallel with the DC breaker; the central controller is configured to drive the DC-DC chopper module 104 and the bi-directional AC-DC power module 102 based on the received battery side voltage, battery side current, bus side voltage, system side current, AC current, and filter current. The direct current breaker comprises QF1A and QF1B, wherein the QF1A and the QF1B are in parallel connection, and the QF1A and the QF1B are connected between a positive electrode and a negative electrode (DC (+ -)) of the all-vanadium redox flow battery and the energy storage converter bidirectional AC-DC power module 102.
Optionally, the direct current pre-charging module 103 includes a second contactor KM1A/B and a second pre-charging resistor R1-2 connected in sequence; the direct current pre-charging module 103 is used for pre-charging the bidirectional AC-DC power module 102 through the all-vanadium redox flow battery. Specifically, the two ends of the incoming and outgoing line of the direct current breaker are connected in parallel to the direct current pre-charging module 103, the direct current pre-charging module 103 is composed of a contactor KM1A/B and a pre-charging resistor R1-2, when the voltage of the power grid at the alternating current side is zero or the alternating current side is a load, if an energy storage converter needs to be started at the moment, the energy storage converter can pre-charge the supporting capacitor of the bidirectional AC-DC power module 102 through a flow battery, the function of the resistor R1-2 is to limit charging current, and damage to a system caused by overlarge current when the direct current breaker is directly closed is prevented.
Optionally, the energy storage converter system 1 further includes an AC pre-charging module 105, one end of the AC pre-charging module 105 is connected between the bidirectional AC-DC power module 102 and the DC fuse FU1, and the other end of the AC pre-charging module 105 is connected between the AC power arrester SPD2 and the AC circuit breaker QF 2. The alternating current precharge module 105 comprises a three-phase rectifier bridge, a first precharge resistor R5-7 and a first contactor KM13 which are connected in sequence; the AC pre-charge module 105 is configured to pre-charge the bi-directional AC-DC power module 102 via a three-phase rectifier bridge. Specifically, when the voltage at the battery side (direct current side) is zero or lower, if the energy storage converter needs to be started at this time, the energy storage converter can precharge the supporting capacitor of the bidirectional AC-DC power module 102 through the three-phase rectifier bridge at the alternating current side, and the resistor R5-7 acts to limit the precharge current, so as to prevent the damage to the system caused by the excessive current when the direct current breaker is directly closed.
Optionally, the DC-DC chopper module 104 includes a third contactor KM3A/B and a DC-DC chopper 1041 connected in sequence; the DC-DC chopper module 104 is configured to convert direct-current high voltage input by the bidirectional AC-DC power module 102 into direct-current low voltage output to charge the all-vanadium redox flow battery. Specifically, the two ends of the incoming and outgoing line of the DC breaker are connected in parallel to the DC-DC chopper module 104, when the battery voltage is low or even reaches 0V, the DC breaker is opened, the contactor KM3A/B of the DC-DC chopper module 104 is closed, at this time, the DC-DC chopper 1041 and the bidirectional AC-DC power module 102 work simultaneously to charge the flow battery, when the charging reaches a set value, the chopper contactor KM3A/B is opened again, the DC breaker is closed, the system is disconnected from the DC-DC chopper module 104, and the bidirectional AC-DC power module 102 continues to charge the flow battery. Through the DC bus parallel DC-DC chopper module 104, the conversion efficiency of electric energy is improved, the loss of electric energy is reduced, the structure is simple, the cost is low, and the maintenance is convenient.
Optionally, the AC filter is connected between the bidirectional AC-DC power module 102 and the AC fuse QF2, and includes a reactor L1 and a filter capacitor C1-6 sequentially connected to filter out higher harmonics generated by the high-speed switch of the bidirectional AC-DC power module 102. By accessing the LC filter, the higher harmonic generated by the high-speed switch of the power unit can be filtered, so that the electric energy quality of the system output is improved.
Optionally, the central controller is further configured to drive the bidirectional AC-DC power module 102 and the DC-DC chopper module 104 to charge or discharge the all-vanadium redox flow battery based on the values of the battery side voltage and the preset voltage detected by the received DC voltage sensor.
Optionally, the central controller is further configured to: when the received battery side voltage is greater than a preset voltage, driving the bidirectional AC-DC power module 102 to charge the all-vanadium redox flow battery; when the received battery side voltage is smaller than a preset voltage, the bidirectional AC-DC power module 102 and the DC-DC chopper module 104 are driven to charge the full-alum flow battery, and when the battery side voltage rises to the preset voltage, the DC-DC chopper module 104 is driven to stop working, so that the bidirectional AC-DC power module 102 continues to charge the full-alum flow battery. Specifically, if the battery side voltage is greater than the set value, the circuit breaker QF1A/B is closed, and the central controller drives the bidirectional AC-DC power module 102 to charge the flow battery system; if the battery side voltage is smaller than the set value, the contactor KM3A/B is closed, the central controller drives the bidirectional AC-DC power module 102 and the DC-DC chopper module 104 to charge the battery system, after the battery voltage rises to the set value, the central controller drives the chopper 1041 to stop working, the contactor KM3A/B is opened, then the breaker QF1A/B is closed, and the converter continues to charge the flow battery system through the bidirectional AC-DC power unit. The direct current sensor can detect the charging current in real time, and the central controller drives the bidirectional AC-DC power module 102 and the DC-DC chopper module 104 to adjust the current input in the process of charging the battery through the charging current detected in real time and the system side current. The bidirectional AC-DC power module 102 rectifies the AC power of the power grid into DC power, and sends the DC power to the DC-DC chopper module 104, and the chopper 1041 steps down to a reasonable voltage to charge the battery, and the voltage can be adjusted in real time during the charging process, so as to protect the battery.
Optionally, a DSP TMS320F28335 chip and an ARM STM32H743ZIT chip are integrated in the central controller, that is, the central controller is a dual-chip control architecture, external signals such as an IO, a bus, an encoder and the like are all processed in time by ARM (Advanced RISC Machine), and the DSP (Digital Signal Processing ) and the ARM exchange data in real time through a parallel bus, so that high-speed and high-precision loop control operation can be realized, and excellent dynamic response and control precision of the driving system are ensured.
Optionally, as shown in fig. 2, the bidirectional AC-DC power module 102 adopts an NPC-1 three-level topology structure, and includes an IGBT tube T1, an IGBT tube T2, an IGBT tube T3, an IGBT tube T4, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a DC support capacitor C1, and a DC support capacitor C2; an IGBT tube T1 anti-parallel diode D1, an IGBT tube T2 anti-parallel diode D2, an IGBT tube T3 anti-parallel diode D3, and an IGBT tube T4 anti-parallel diode D4; the IGBT tube T1 is sequentially connected with the IGBT tube T2, the IGBT tube T3 and the IGBT tube T4 in series, and the midpoints of the IGBT tube T1 and the IGBT tube T2 are connected with one ends of a diode D5 and a diode D6 which are connected in series; the middle points of the IGBT tube T3 and the IGBT tube T4 are connected to the other ends of the diode D5 and the diode D6 which are connected in series; the direct current support capacitor C1 and the direct current support capacitor C2 are connected in series, and the midpoint of the direct current support capacitor C1 and the midpoint of the direct current support capacitor C2 are connected to the midpoint of the IGBT tube T2 and the midpoint of the IGBT tube T3 which are connected in series.
In the embodiment, when the AC side power grid voltage is zero or the AC side is a load, if the converter needs to be started, the converter can precharge the supporting capacitor of the bidirectional AC-DC power module through the battery, so that the bidirectional AC-DC power module has the battery side voltage 0V charging function. By connecting the DC-DC chopper module 104 in parallel with the DC bus, the conversion efficiency of electric energy is improved, the loss of electric energy is reduced, the structure is simple, the cost is low, and the maintenance is convenient. According to the embodiment of the application, the contactor at the alternating current side in the conventional design is eliminated, the controllable breaker is adopted to replace the original breaker and contactor scheme, the space in the cabinet is further saved, the energy density of the converter is improved, and the cost is reduced.
Example 2
As shown in fig. 3, a flow chart of a flow battery energy storage converter control method is shown.
As an example, the method comprises:
in the charge mode of operation,
and S310, carrying out alternating-current precharge on the energy storage converter.
And S320, the central controller acquires the battery side voltage through the direct current side voltage sensor.
And S330, when the battery side voltage is greater than the preset voltage, the central controller drives the bidirectional AC-DC power module to charge the flow battery.
And S340, when the voltage of the battery side is smaller than the preset voltage, the central controller drives the bidirectional AC-DC power module and the DC-DC chopper module to charge the flow battery.
And S350, when the voltage of the battery side reaches the preset voltage, the central controller drives the DC-DC chopper module to stop working and drives the bidirectional AC-DC power module to continuously charge the flow battery.
Specifically, in a charging mode, the converter is firstly precharged by alternating current, then the breaker QF2 is closed, the central controller detects the battery voltage through the direct current side voltage sensor, if the battery voltage is larger than a set value, the breaker QF1A/B is closed, and the converter charges the flow battery system through the bidirectional AC-DC power unit; if the battery voltage is smaller than the set value, the contactor KM3A/B is closed, the battery system is charged through the bidirectional AC-DC power unit and the chopper, when the battery voltage rises to the set value, the chopper stops working, the contactor KM3A/B is opened, then the breaker QF1A/B is closed, and the converter continuously charges the flow battery system through the bidirectional AC-DC power unit. The current sensor can detect the charging current in real time, the bidirectional AC-DC power unit rectifies alternating current of the power grid into direct current and transmits the direct current to the chopper, the chopper reduces the direct current to reasonable voltage to charge the battery, and the voltage can be adjusted in real time, so that the battery is protected.
In the discharging mode, S410, the energy storage converter is pre-charged with direct current.
S420, the central controller drives the bidirectional AC-DC power module to invert alternating current to discharge the alternating current.
Specifically, in the discharging mode, the converter is firstly precharged by direct current, and the converter sequentially closes the direct current breaker QF1A/QF1B and the alternating current breaker QF2, and discharges the alternating current by driving the bidirectional AC-DC power unit to invert the alternating current.
Example 3
The embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a flow battery energy storage converter control method, and the flow battery energy storage converter control program realizes the steps of the flow battery energy storage converter control method when being executed by a processor. Because the storage medium adopts all the technical schemes of all the embodiments, the storage medium has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.
Example 4
Referring to fig. 4, an embodiment of the present invention further provides an electronic device, including: a memory and a processor; at least one program instruction is stored in the memory; the processor loads and executes the at least one program instruction to implement the flow battery energy storage converter control method provided in embodiment 2.
The memory 502 and the processor 501 are connected by a bus, which may include any number of interconnected buses and bridges, which connect together the various circuits of the one or more processors 501 and the memory 502. The bus may also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or may be a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor 501 is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor 501.
The processor 501 is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory 502 may be used to store data used by processor 501 in performing operations.
The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (10)
1. A flow battery energy storage converter control system, the system comprising: an energy storage converter system and a full alum flow battery;
one end of the energy storage converter system is connected with the full-alum flow battery, and the other end of the energy storage converter system is connected with a power grid and is used for charging or discharging the full-alum flow battery based on a received scheduling instruction of the power grid;
the energy storage converter system comprises a direct current power supply lightning arrester, a direct current circuit breaker, a direct current fuse, a bidirectional AC-DC power module, a reactor, an alternating current filter, an alternating current circuit breaker, an alternating current power supply lightning arrester, a direct current voltage sensor, a direct current sensor, an alternating current voltage sensor, an alternating current sensor and a central controller which are sequentially connected, and a DC-DC chopper module and a direct current precharge module which are respectively connected with the direct current circuit breaker in parallel;
the central controller is configured to drive the DC-DC chopper module and the bi-directional AC-DC power module based on the received battery side voltage, battery side current, bus side voltage, system side current, AC current, and filter current.
2. The flow battery energy storage converter control system of claim 1, further comprising an AC pre-charge module having one end connected between the bi-directional AC-DC power module and a DC fuse and the other end connected between the AC power arrester and an AC circuit breaker.
3. The flow battery energy storage converter control system of claim 2, wherein the alternating current pre-charge module comprises a three-phase rectifier bridge, a first pre-charge resistor and a first contactor connected in sequence;
the alternating current pre-charging module is used for pre-charging the bidirectional AC-DC power module through a three-phase rectifier bridge.
4. The flow battery energy storage converter control system of claim 1, wherein the direct current pre-charge module comprises a second contactor and a second pre-charge resistor connected in sequence;
the direct current pre-charging module is used for pre-charging the bidirectional AC-DC power module through the full alum flow battery.
5. The flow battery energy storage converter control system of claim 1, wherein the DC-DC chopper module comprises a third contactor and a DC-DC chopper connected in sequence;
the DC-DC chopper module is used for converting direct-current high-voltage power input by the bidirectional AC-DC power module into direct-current low-voltage power output to charge the all-vanadium redox flow battery.
6. The flow battery energy storage converter control system of claim 1, wherein the alternating current filter is connected between the bidirectional AC-DC power module and the alternating current fuse, and comprises a reactor and a filter capacitor which are sequentially connected, and the reactor and the filter capacitor are used for filtering out higher harmonics generated by a high-speed switch of the bidirectional AC-DC power module.
7. The flow battery energy storage converter control system of claim 1, wherein the bi-directional AC-DC power module comprises an IGBT tube T1, an IGBT tube T2, an IGBT tube T3, an IGBT tube T4, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a DC support capacitor C1, and a DC support capacitor C2;
an IGBT tube T1 anti-parallel diode D1, an IGBT tube T2 anti-parallel diode D2, an IGBT tube T3 anti-parallel diode D3, and an IGBT tube T4 anti-parallel diode D4;
the IGBT tube T1 is sequentially connected with the IGBT tube T2, the IGBT tube T3 and the IGBT tube T4 in series, and the midpoints of the IGBT tube T1 and the IGBT tube T2 are connected with one ends of a diode D5 and a diode D6 which are connected in series;
the middle points of the IGBT tube T3 and the IGBT tube T4 are connected to the other ends of the diode D5 and the diode D6 which are connected in series;
the direct current support capacitor C1 and the direct current support capacitor C2 are connected in series, and the midpoint of the direct current support capacitor C1 and the midpoint of the direct current support capacitor C2 are connected to the midpoint of the IGBT tube T2 and the midpoint of the IGBT tube T3 which are connected in series.
8. The flow battery energy storage converter control system of claim 1, wherein the central controller is further configured to drive the bidirectional AC-DC power module and the DC-DC chopper module to charge or discharge the all-vanadium flow battery based on a value of a battery side voltage detected by the received DC voltage sensor and a preset voltage.
9. The flow battery energy storage converter control system of claim 8, wherein the central controller is further configured to:
when the received battery side voltage is greater than a preset voltage, driving the bidirectional AC-DC power module to charge the all-vanadium redox flow battery;
when the received battery side voltage is smaller than a preset voltage, the bidirectional AC-DC power module and the DC-DC chopper module are driven to charge the full-alum flow battery, and when the battery side voltage rises to the preset voltage, the DC-DC chopper module is driven to stop working, so that the bidirectional AC-DC power module continues to charge the full-alum flow battery.
10. A method for controlling an energy storage converter of a flow battery, the method comprising:
in a charging mode, carrying out alternating current precharge on the energy storage converter;
the central controller acquires battery side voltage through a direct current side voltage sensor;
when the voltage of the battery side is larger than the preset voltage, the central controller drives the bidirectional AC-DC power module to charge the flow battery;
when the voltage of the battery side is smaller than the preset voltage, the central controller drives the bidirectional AC-DC power module and the DC-DC chopper module to charge the flow battery;
when the voltage of the battery side reaches a preset voltage, the central controller drives the DC-DC chopper module to stop working and drives the bidirectional AC-DC power module to continuously charge the flow battery;
in a discharging mode, carrying out direct current precharge on the energy storage converter;
the central controller drives the bidirectional AC-DC power module to invert alternating current to discharge outside.
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| CN202311648870.5A CN117614303A (en) | 2023-12-04 | 2023-12-04 | Flow battery energy storage converter control system and method |
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| CN202311648870.5A CN117614303A (en) | 2023-12-04 | 2023-12-04 | Flow battery energy storage converter control system and method |
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