CN117081209A - Energy storage inverter and self-checking method of switching circuit thereof - Google Patents

Energy storage inverter and self-checking method of switching circuit thereof Download PDF

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Publication number
CN117081209A
CN117081209A CN202311080739.3A CN202311080739A CN117081209A CN 117081209 A CN117081209 A CN 117081209A CN 202311080739 A CN202311080739 A CN 202311080739A CN 117081209 A CN117081209 A CN 117081209A
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CN
China
Prior art keywords
relay
energy storage
load
storage inverter
power grid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311080739.3A
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Chinese (zh)
Inventor
涂鹏飞
廖小俊
蒋勤凤
刘瑞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Haipeng Technology Co ltd
Original Assignee
Suzhou Haipeng Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Haipeng Technology Co ltd filed Critical Suzhou Haipeng Technology Co ltd
Priority to CN202311080739.3A priority Critical patent/CN117081209A/en
Publication of CN117081209A publication Critical patent/CN117081209A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a self-checking method of an energy storage inverter and a switching circuit thereof, wherein the energy storage inverter comprises: an inversion module; a switching circuit including relays Q1 to Q10, Q3 connected between an output positive electrode of the inverter module and the node a; q5 is connected between the node A and the input anode of the power grid; q4 is connected between the output cathode of the inversion module and the node B; q6 is connected between the node B and an input cathode of the power grid; q9 is connected between the output positive electrode of the inversion module and the input positive electrode of the load; q10 is connected between the output negative electrode of the inversion module and the input negative electrode of the load; q7 is connected between node B and the input cathode of the load; q8 is connected between the node A and the input positive electrode of the load; q1 is connected between an input positive electrode of the power grid and an input positive electrode of the load; q2 is connected between the input cathode of the grid and the input cathode of the load. The invention can optimize the number of the relays, and ensure that the load is not powered down during self-detection, and the switching of the relays is switched under zero current.

Description

Energy storage inverter and self-checking method of switching circuit thereof
Technical Field
The invention relates to the technical field of energy storage inverters, in particular to a self-checking method of an energy storage inverter and a switching circuit thereof.
Background
The number of switching circuit relays in the existing energy storage inverter is too large, the material cost is increased, the size of a PCB (Printed circuit board, namely a printed circuit board) is excessively large, insulation requirements of the inverter during maintenance cannot be met after the relays are reduced, no matter what control mode of the switching circuit cannot realize the problem that loads are not powered down during self-inspection, the risk of load damage can be caused, the existing switching mode can also lead to the switching of the current of the relays, and the service life of the relays can be influenced.
Accordingly, there is a need to provide a new and improved solution to overcome the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a self-checking method of an energy storage inverter and a switching circuit thereof, which not only can optimize the number of relays under the condition of ensuring that the safety requirements are met, but also can ensure that a load is not powered down during self-checking, and the switching of the relays is performed under zero current.
In order to solve the above-described problems, according to an aspect of the present invention, there is provided an energy storage inverter including: the inverter module is used for converting the direct-current voltage received by the direct-current side input end of the inverter module into alternating-current voltage and outputting the alternating-current voltage through the alternating-current side output end of the inverter module; a switching circuit including a first relay Q1, a second relay Q2, a third relay Q3, a fourth relay Q4, a fifth relay Q5, a sixth relay Q6, a seventh relay Q7, an eighth relay Q8, a ninth relay Q9, and a tenth relay Q10, wherein the third relay Q3 is connected between an output positive electrode of the inverter module and a first node a; a fifth relay Q5 is connected between the first node A and the input anode of the power grid; the fourth relay Q4 is connected between the output negative electrode of the inversion module and the second node B; the sixth relay Q6 is connected between the second node B and an input negative electrode of the power grid; the ninth relay Q9 is connected between an output positive electrode of the inversion module and an input positive electrode of a load; the tenth relay Q10 is connected between an output negative electrode of the inversion module and an input negative electrode of a load; the seventh relay Q7 is connected between the second node B and the input negative electrode of the load; the eighth relay Q8 is connected between the first node A and the input positive electrode of the load; the first relay Q1 is connected between an input positive electrode of the power grid and an input positive electrode of the load; the second relay Q2 is connected between an input negative electrode of the power grid and an input negative electrode of the load; a control circuit for controlling the closing and opening of the first to tenth relays Q1 to Q10; the direct-current side input end of the inversion module is connected with the battery.
Further, when the energy storage inverter works in a battery-free mode, the control circuit controls the third relay Q3 to the sixth relay Q6 to be closed and controls the first relay Q1, the second relay Q2 and the seventh relay Q7 to the tenth relay Q10 to be opened, and the energy storage inverter feeds back energy to the power grid.
Further, when the energy storage inverter works in a battery mode, the control circuit controls the first to sixth relays Q1 to Q6 to be closed and controls the seventh to tenth relays Q7 to Q10 to be opened, the energy storage inverter feeds back energy to the power grid, and the energy storage inverter simultaneously supplies energy to the load.
Further, when the power grid charges the battery of the energy storage inverter, the control circuit controls the first to sixth relays Q1 to Q6 to be closed and controls the seventh to tenth relays Q7 to Q10 to be opened, the power grid supplies power to the load, and the power grid simultaneously supplies energy to the energy storage machine.
Further, when the power grid is abnormal, the control circuit controls the first to eighth relays Q1 to Q8 to be opened, and controls the ninth and tenth relays Q9 and Q10 to be closed, and the energy storage inverter supplies power to the load separately.
According to another aspect of the present invention, there is provided a self-checking method of a switching circuit of an energy storage inverter, comprising: the control circuit controls the first, second, ninth and tenth relays Q1, Q2, Q9 and Q10 to be closed, and controls the third to eighth relays Q3 to Q8 to be opened; the output of the energy storage inverter is controlled to be zero, so that the energy of the load is ensured to be provided by the power grid, and the control circuit controls the ninth relay Q9 and the tenth relay Q10 to be disconnected;
closing the third to sixth relays Q3 to Q6 again, and continuously outputting energy by the energy storage inverter to feed back energy to the power grid and provide energy to the load; the output of the energy storage inverter is controlled to be zero, the control circuit controls the third relay Q3 to the sixth relay Q6 to be opened, and then the third relay Q3 to the eighth relay Q8 are closed; and increasing the output power of the energy storage inverter, ensuring that the energy of the load is provided by the energy storage inverter, enabling the grid-connected energy to be zero, and controlling the first relay Q1 and the second relay Q2 to be disconnected again by the control circuit.
Compared with the prior art, the invention can optimize the number of the relays, and can ensure the absolute safety of personnel no matter what state the energy storage inverter (or the energy storage machine) is in under the condition of meeting the safety requirements; the invention can ensure that the load is not powered down during self-detection by controlling the logic time sequence of the relay, and the switching of the relay is switched under zero current.
Other objects, features and advantages of the present invention will be described in the following detailed description of the embodiments with reference to the accompanying drawings.
Drawings
The invention will be more readily understood by reference to the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:
FIG. 1 is a schematic diagram of an energy storage inverter according to an embodiment of the present invention;
fig. 2 is a self-checking method of a switching circuit of the energy storage inverter shown in fig. 1 according to an embodiment of the present invention. .
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. The terms "plurality" and "a plurality" as used herein mean two or more. "and/or" in the present invention means "and" or ".
Fig. 1 is a schematic diagram of an energy storage inverter according to an embodiment of the invention. The energy storage inverter 100 shown in fig. 1 includes an inverter module 110, a switching circuit 120, and a control circuit 130.
The inverter module 110 is configured to convert a dc voltage received by a dc side input terminal thereof into an ac voltage, and output the ac voltage through an ac side output terminal thereof. The inverter module 110 may also be referred to as a DC (i.e., direct current) -AC (i.e., alternating current) converter.
The switching circuit 120 includes a first relay Q1, a second relay Q2, a third relay Q3, a fourth relay Q4, a fifth relay Q5, a sixth relay Q6, a seventh relay Q7, an eighth relay Q8, a ninth relay Q9, and a tenth relay Q10. Wherein, the third relay Q3 is connected between the output positive electrode of the inverter module 110 and the first node a; the fifth relay Q5 is connected between the first node a and the input positive pole of the GRID (i.e., GRID) 200; the fourth relay Q4 is connected between the output negative electrode of the inverter module 110 and the second node B; a sixth relay Q6 is connected between the second node B and the input negative pole of the grid 200; the ninth relay Q9 is connected between the output anode of the inverter module 110 and the input anode of the LOAD (i.e., LOAD) 300; the tenth relay Q10 is connected between the output negative electrode of the inverter module 110 and the input negative electrode of the load 300; a seventh relay Q7 is connected between the second node B and the input negative electrode of the load 300; the eighth relay Q8 is connected between the first node a and the input positive electrode of the load 300; the first relay Q1 is connected between the input positive pole of the power grid 200 and the input positive pole of the load 300; the second relay Q2 is connected between the input negative pole of the grid 200 and the input negative pole of the load 300.
The control circuit 130 is used to control the closing and opening of the first to tenth relays Q1 to Q10. The dc side input terminal of the inverter module 110 is connected to a battery (not shown).
When the energy storage inverter (or energy storage machine) 100 operates in the battery-less mode, the control circuit 130 controls the third to sixth relays Q3 to Q6 to be simultaneously closed, and controls the first, second, seventh, eighth, ninth, and tenth relays Q1, Q2, Q7, Q8, Q9, and Q10 to be opened, and the energy storage inverter 100 feeds back energy to the power grid 200.
When the energy storage inverter (or energy storage machine) 100 operates in the battery mode, the control circuit 130 controls the first to sixth relays Q1 to Q6 to be simultaneously closed and controls the seventh to tenth relays Q7 to Q10 to be opened, the energy storage inverter 100 feeds back energy to the power grid 200, and the energy storage inverter 100 simultaneously supplies energy to the load 300.
When the power grid 200 charges the battery of the energy storage inverter 100, the control circuit 130 controls the first to sixth relays Q1 to Q6 to be simultaneously closed and controls the seventh to tenth relays Q7 to Q10 to be opened, the power grid 200 supplies power to the load 300, and the power grid 200 simultaneously supplies power to the energy storage inverter 100.
When the power grid 200 is abnormal, the control circuit 130 controls the first to eighth relays Q1 to Q8 to be all opened, and controls the ninth and tenth relays Q9 and Q10 to be all closed, and the energy storage inverter 100 individually supplies power to the load 300. At this time, since the energy storage inverter 100 and the power grid 200 are connected in series with 2 sets of relays (i.e., relays), the safety distance meets the safety requirement.
Referring to fig. 2, a self-checking method of a switching circuit of the energy storage inverter shown in fig. 1 according to an embodiment of the invention is shown. The self-checking method of the switching circuit of the energy storage inverter shown in fig. 2 comprises the following steps.
Step 210, the control circuit 130 controls the first relay Q1, the second relay Q2, the ninth relay Q9 and the tenth relay Q10 to be simultaneously closed, and controls the third relay Q3 to the eighth relay Q8 to be opened. For example, when the relays normally operate, the control circuit 130 controls the first relay Q1, the second relay Q2, the ninth relay Q9, and the tenth relay Q10 to be simultaneously closed, and controls the third relay Q3 to the eighth relay Q8 to be opened, and a self-checking circuit is required to determine whether the relays are stuck or opened.
Step 220, the output of the energy storage inverter 100 is controlled to be zero, so that the energy of the load 300 is provided by the power grid 200, at the moment, the control circuit 130 controls the ninth relay Q9 and the tenth relay Q10 to be disconnected, and at the moment, the nine relay Q9 and the tenth relay Q10 are turned off in a zero current mode.
In step 230, the third to sixth relays Q3 to Q6 are closed again, and the energy storage inverter 100 continues to output energy to feed back energy to the grid 200 and to supply energy to the load 300.
In step 240, the output of the energy storage inverter 100 is controlled to be zero, the control circuit 130 controls the third relay Q3 to the sixth relay Q6 to be opened, at this time, the third relay Q3 to the sixth relay Q6 are turned off with zero current, and then the third relay Q3 to the eighth relay Q8 are turned on with zero current, at this time, the third relay Q3 to the eighth relay Q8 are turned on with zero current.
Step 250, increasing the output power of the energy storage inverter 100, ensuring that the energy of the load 300 is provided by the energy storage inverter 100, and the grid-connected energy is zero, and the control circuit 130 controls the first relay Q1 and the second relay Q2 to be disconnected, so that the first relay Q1 and the second relay Q2 ensure zero current to be turned off.
So far, all relays Q1-Q10 can be guaranteed to be turned on and off once, but the load 300 is not powered down at the moment, and switching of the relays Q1-Q10 is guaranteed to be switched under zero current.
In summary, the invention can optimize the number of relays, and ensure the absolute safety of personnel no matter what state the energy storage inverter (or the energy storage machine) is in under the condition of meeting the safety requirements; the invention can ensure that the load is not powered down during self-detection by controlling the logic time sequence of the relay, and the switching of the relay is switched under zero current.
The foregoing description has fully disclosed specific embodiments of this invention. It should be noted that any modifications to the specific embodiments of the invention may be made by those skilled in the art without departing from the scope of the invention as defined in the appended claims. Accordingly, the scope of the claims of the present invention is not limited to the foregoing detailed description.

Claims (6)

1. An energy storage inverter, comprising:
the inverter module is used for converting the direct-current voltage received by the direct-current side input end of the inverter module into alternating-current voltage and outputting the alternating-current voltage through the alternating-current side output end of the inverter module;
a switching circuit including a first relay Q1, a second relay Q2, a third relay Q3, a fourth relay Q4, a fifth relay Q5, a sixth relay Q6, a seventh relay Q7, an eighth relay Q8, a ninth relay Q9, and a tenth relay Q10, wherein the third relay Q3 is connected between an output positive electrode of the inverter module and a first node a; a fifth relay Q5 is connected between the first node A and the input anode of the power grid; the fourth relay Q4 is connected between the output negative electrode of the inversion module and the second node B; the sixth relay Q6 is connected between the second node B and an input negative electrode of the power grid; the ninth relay Q9 is connected between an output positive electrode of the inversion module and an input positive electrode of a load; the tenth relay Q10 is connected between an output negative electrode of the inversion module and an input negative electrode of a load; the seventh relay Q7 is connected between the second node B and the input negative electrode of the load; the eighth relay Q8 is connected between the first node A and the input positive electrode of the load; the first relay Q1 is connected between an input positive electrode of the power grid and an input positive electrode of the load; the second relay Q2 is connected between an input negative electrode of the power grid and an input negative electrode of the load;
a control circuit for controlling the closing and opening of the first to tenth relays Q1 to Q10;
the direct-current side input end of the inversion module is connected with the battery.
2. The energy storage inverter of claim 1, wherein,
when the energy storage inverter works in a battery-free mode, the control circuit controls the third relay Q3 to the sixth relay Q6 to be closed and controls the first relay Q1, the second relay Q2 and the seventh relay Q7 to the tenth relay Q10 to be opened, and the energy storage inverter feeds back energy to the power grid.
3. The energy storage inverter of claim 1, wherein,
when the energy storage inverter works in a battery mode, the control circuit controls the first relay Q1 to the sixth relay Q6 to be closed and controls the seventh relay Q7 to the tenth relay Q10 to be opened, the energy storage inverter feeds back energy to the power grid, and the energy storage inverter simultaneously supplies energy to the load.
4. The energy storage inverter of claim 1, wherein,
when the power grid charges the battery of the energy storage inverter, the control circuit controls the first relay Q1 to the sixth relay Q6 to be closed and controls the seventh relay Q7 to the tenth relay Q10 to be opened, the power grid supplies power to the load, and the power grid simultaneously supplies energy to the energy storage machine.
5. The energy storage inverter of claim 1, wherein,
when the power grid is abnormal, the control circuit controls the first to eighth relays Q1 to Q8 to be opened, controls the ninth and tenth relays Q9 and Q10 to be closed, and the energy storage inverter independently supplies power to the load.
6. A self-test method of an energy storage inverter switching circuit as claimed in any one of claims 1 to 5, comprising:
the control circuit controls the first, second, ninth and tenth relays Q1, Q2, Q9 and Q10 to be closed, and controls the third to eighth relays Q3 to Q8 to be opened;
the output of the energy storage inverter is controlled to be zero, so that the energy of the load is ensured to be provided by the power grid, and the control circuit controls the ninth relay Q9 and the tenth relay Q10 to be disconnected;
closing the third to sixth relays Q3 to Q6 again, and continuously outputting energy by the energy storage inverter to feed back energy to the power grid and provide energy to the load;
the output of the energy storage inverter is controlled to be zero, the control circuit controls the third relay Q3 to the sixth relay Q6 to be opened, and then the third relay Q3 to the eighth relay Q8 are closed;
and increasing the output power of the energy storage inverter, ensuring that the energy of the load is provided by the energy storage inverter, enabling the grid-connected energy to be zero, and controlling the first relay Q1 and the second relay Q2 to be disconnected again by the control circuit.
CN202311080739.3A 2023-08-25 2023-08-25 Energy storage inverter and self-checking method of switching circuit thereof Pending CN117081209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311080739.3A CN117081209A (en) 2023-08-25 2023-08-25 Energy storage inverter and self-checking method of switching circuit thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311080739.3A CN117081209A (en) 2023-08-25 2023-08-25 Energy storage inverter and self-checking method of switching circuit thereof

Publications (1)

Publication Number Publication Date
CN117081209A true CN117081209A (en) 2023-11-17

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ID=88713035

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311080739.3A Pending CN117081209A (en) 2023-08-25 2023-08-25 Energy storage inverter and self-checking method of switching circuit thereof

Country Status (1)

Country Link
CN (1) CN117081209A (en)

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