CN115224740A - Inverter with split-phase and multi-mode single-phase output switching and method - Google Patents
Inverter with split-phase and multi-mode single-phase output switching and method Download PDFInfo
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- CN115224740A CN115224740A CN202211133643.4A CN202211133643A CN115224740A CN 115224740 A CN115224740 A CN 115224740A CN 202211133643 A CN202211133643 A CN 202211133643A CN 115224740 A CN115224740 A CN 115224740A
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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
- H02J3/381—Dispersed generators
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- H02J9/062—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 AC powered loads
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
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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
- H02M7/5387—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 in a bridge configuration
- H02M7/53871—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 in a bridge configuration with automatic control of output voltage or current
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Inverter Devices (AREA)
Abstract
The application provides an inverter with split-phase and multi-mode single-phase output switching, which comprises a direct current power supply module, an inversion module and a switching module; the switching module comprises a switch and a split-phase alternating current power grid; the inversion module comprises a first bridge arm circuit and a second bridge arm circuit; when the switch is switched off, the inverter is in a circuit structure of a split-phase system; when the switch is closed, the inverter is in a double-current multi-mode single-phase system circuit structure. A handover method is also disclosed. By implementing the invention, the inverter circuit can be automatically switched from the circuit structure of the split-phase system to the circuit structure of the multimode single-phase system through the change-over switch, so that double split-phase single-phase output power and current can be output under the condition of the same rated requirement of the circuit structure of the split-phase system in the inverter.
Description
Technical Field
The application belongs to the technical field of power electronics, and particularly relates to an inverter with split-phase and multi-mode single-phase output switching and a method.
Background
At present, the light storage inverter is generally divided into household and outdoor. For some countries the grid is of split-phase (split-phase) configuration, e.g. 120V bi-phase, then the inverter output specification is designed to be e.g. 5KW, then each phase output power is 2.5KW. Then the current rating of the inverter loop output is around 20.8A for the inverter. If we use the inverter outdoors, then the electrical apparatus is still 120V voltage, the electrical apparatus can only be hung in a looks, if at this moment to the inverter if to reach 120V single-phase output and reach the power supply of 5KW or start the inductive electrical apparatus demand in the twinkling of an eye, then the inverter circuit output current will reach 50A, need change into more than 50A current sensor, also need increase one time to realize single-phase peak output and be greater than 5KW to the inversion inductance and wire winding simultaneously, undoubtedly greatly increased the cost.
No relevant design has been found to be relevant for the above applications.
Disclosure of Invention
The invention aims to solve the problem that when the household energy storage inverter with the split-phase power grid structure is used as an outdoor all-in-one machine, the dual-phase power of the inverter can not be output in a single phase, and the like, and simultaneously, the invention is based on the consideration of cost and circuit structure: the scheme of the invention is designed based on the starting point of low cost and high reliability.
In order to solve the above problems, an inverter and a method having a combination of split-phase and multi-mode single-phase output switching are proposed.
In a first aspect, an inverter with split-phase and multi-mode single-phase output switching comprises:
a DC power supply module;
an inversion module;
a switching module;
the inversion module is electrically connected with the direct current power supply module and the switching module respectively;
the switching module includes:
a switch;
a split phase AC electrical network;
the inversion module comprises a first bridge arm circuit and a second bridge arm circuit;
the first bridge arm circuit and the second bridge arm circuit are connected in parallel to the output end of the direct current power supply module;
the first end of the change-over switch is respectively and electrically connected with the output end of the second bridge arm circuit and the first end of the split-phase alternating current power grid, and the second end of the change-over switch is electrically connected with the output end of the first bridge arm circuit and the second end of the split-phase alternating current power grid:
when the change-over switch is switched off, the inverter is in a split-phase system circuit structure;
when the switch is closed, the inverter is in a double-current multi-mode single-phase system circuit structure.
In a first possible implementation manner of the inverter according to the first aspect of the present invention, the switch includes:
a first switch and a second switch;
the first switch and the second switch are connected in series to form the change-over switch;
the split-phase alternating current power grid comprises a first input unit and a second input unit;
the second end of the first input unit and the second end of the second input unit are connected in series to form the alternating current power grid;
the first end of the change-over switch is respectively and electrically connected with the second output end of the inversion module and the first end of the first input unit;
and the second end of the change-over switch is respectively and electrically connected with the first output end of the inversion module and the first end of the second input unit.
With reference to the first possible implementation manner of the first aspect of the present invention, in a second possible implementation manner, the inverter module includes:
a first bridge arm circuit and a second bridge arm circuit;
the first output end is the output end of the second bridge arm circuit;
the second output end is the output end of the first bridge arm circuit;
the first bridge arm circuit and the second bridge arm circuit are connected in parallel, and the input end of the first bridge arm circuit and the input end of the second bridge arm circuit are respectively and electrically connected with the output end of the direct current power supply module.
With reference to the second possible implementation manner of the first aspect of the present invention, in a third possible implementation manner, the switching module further includes:
a third switch and a fourth switch;
a fifth switch and a sixth switch;
the second end of the fifth switch is electrically connected with the first end of the first input unit, and the first end of the fifth switch is electrically connected with the second end of the third switch and the first off-line output unit respectively;
the first end of the third switch is electrically connected with the first end and the second output end of the change-over switch;
the second end of the sixth switch is electrically connected with the second end of the second input unit, and the first end of the sixth switch is electrically connected with the second end of the fourth switch and the second off-line output unit respectively;
the first end of the fourth switch is electrically connected with the second end and the first output end of the change-over switch;
a first end of the double current multi-mode single phase system circuit configuration is electrically connected to a series connection point of the first switch and the second switch;
and the second end of the double-current multi-mode single-phase system circuit structure is respectively and electrically connected with the series connection points of the third output end and the second end of the first input unit and the first end of the second input unit.
In combination with the third possible implementation manner of the first aspect of the present invention, in a fourth possible implementation manner,
the first leg circuit includes:
a first power tube and a third power tube;
the second leg circuit includes:
a second power tube and a fourth power tube;
the inversion module further includes:
the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first current transformer, a second current transformer, a first inductor and a second inductor;
the first end of the first capacitor is respectively and electrically connected with the first end of the DC-DC unit, the first end of the first power tube and the first end of the second power tube, the second end of the first capacitor is connected with the first end of the second capacitor, the series connection point of the second end of the third capacitor and the first end of the fourth capacitor, the third output end, the second end of the first input unit and the series connection point of the first end of the second input unit, and a first common connection point is formed;
the first end of the third capacitor is connected with the second end of the first inductor, the first end of the change-over switch and the first end of the third switch in common;
the first end of the first inductor is electrically connected with the second end of the first current transformer;
the second end of the fourth capacitor is electrically connected with the second end of the second inductor, the second end of the change-over switch and the second end of the fourth switch in common;
the first end of the second inductor is electrically connected with the second end of the second current transformer;
the second end of the second capacitor is electrically connected with the second end of the DC-DC unit, the second end of the third power tube and the second end of the fourth power tube;
the second end of the first power tube, the first end of the second power tube and the first end of the second current transformer are connected in common;
the second end of the second power tube, the first end of the fourth power tube and the first end of the first current transformer are connected in common;
the third output end is a series connection point of the first off-line output unit and the second off-line output unit.
With reference to the fourth possible implementation manner of the first aspect of the present invention, in a fifth possible implementation manner, the inverter module further includes:
a T-type topology module;
and the first end of the T-shaped topology module is electrically connected with the second output end, the second end of the T-shaped topology module is electrically connected with the first output end, and the third end of the T-shaped topology module is electrically connected with the direct current power supply module.
With reference to the fourth possible implementation manner of the first aspect of the present invention, in a fifth possible implementation manner, the T-type topology module includes:
a fifth power tube, a sixth power tube, a seventh power tube and an eighth power tube;
a second end of the fifth power tube is connected in series with a first end of the sixth power tube, and a second end of the seventh power tube and a first end of the eighth power tube are connected in series;
the first end of the fifth power tube and the first end of the seventh power tube are connected with the first common junction point;
the second end of the sixth power tube is connected with the first end of the first current transformer;
and the second end of the eighth power tube is connected with the first end of the third power tube and the first end of the second current transformer.
With reference to the third possible implementation manner of the first aspect of the present invention, in a sixth possible implementation manner, the inverter module further includes:
a first I-type topology unit and a second I-type topology unit;
two ends of the first I-type topological unit are respectively and electrically connected with two ends of the first bridge arm circuit;
and two ends of the second I-type topological unit are respectively and electrically connected with two ends of the second bridge arm circuit.
With reference to the sixth possible implementation manner of the first aspect of the present invention, in a seventh possible implementation manner, the first type I topology unit includes:
the power supply comprises a first diode, a third diode, a fifth power tube and an eighth power tube;
the second type I topology unit includes:
the power supply comprises a second diode, a fourth diode, a sixth power tube and a seventh power tube;
the fifth power tube and the eighth power tube are sequentially connected in series between the first power tube and the third power tube, the cathode of the first diode is connected between the first power tube and the fifth power tube, the anode of the third diode is connected between the eighth power tube and the third power tube, the anode of the first diode is connected with the cathode of the third diode, and the connecting point is connected with the first common point;
a first output end is led out from between the fifth power tube and the eighth power tube and is electrically connected with a first end of the second current transformer;
the sixth power tube and the seventh power tube are sequentially connected in series between the second power tube and the fourth power tube, the cathode of the second diode is connected between the second power tube and the sixth power tube, the anode of the fourth diode is connected between the fourth power tube and the seventh power tube, the anode of the second diode is connected with the cathode of the fourth diode, and the connection point is connected with the first common point;
and a first output end is led out from between the sixth power tube and the seventh power tube and is electrically connected with the first end of the first current transformer.
In a second aspect, a method with split-phase and multi-mode single-phase output switching is provided, where the inverter according to the first aspect includes:
step 300, by opening/closing the switch, the inverter is made to be in a split-phase system circuit structure/multi-mode single-phase system circuit structure;
the inversion module comprises two bridge arm circuits.
With reference to the switching method of the second aspect, in a first possible implementation manner, the switching method further includes:
and step 400, driving the bridge arm circuits to work simultaneously/respectively driving the bridge arm circuits to work with the phase difference of 180 degrees.
The scheme of the invention has the following technical effects:
1) The inverter circuit can be automatically switched from the split-phase system circuit structure to the multi-mode single-phase system circuit structure through the change-over switch;
2) The multi-mode single-phase structure is formed by connecting 2 paths of half-bridge arm circuits in parallel, and the two half-bridge arm circuits can be switched synchronously or switched at 180 degrees in a staggered mode in a power tube driving mode. The staggered 180-degree switch control can effectively reduce the ripple and temperature rise of the bus capacitor, and can maintain the bus capacitor of the original split-phase system circuit structure.
3) The current sensors CT1 and CT2 and the inductors L1 and L2 of the multi-mode single-phase system circuit structure can realize the output of double split-phase single-phase output power and current under the condition of keeping the same rated requirement as the split-phase system circuit structure.
Drawings
FIG. 1 is a module connection diagram of an inverter embodiment 1 in the invention;
FIG. 2 is a schematic diagram of the connection of components in the inverter embodiment 2 of the invention;
FIG. 3 is a schematic illustration of a double current, multi-mode, single phase system equivalent circuit of the inverter of the present invention;
fig. 4 is a schematic diagram of a split-phase ac grid output voltage waveform in inverter embodiment 1 of the present invention;
fig. 5 is a first schematic diagram of driving timing and inductive current of a first bridge arm circuit and a second bridge arm circuit in an inverter module of an inverter embodiment 2 in the invention;
fig. 6 is a second schematic diagram of driving timings and inductor currents of a first bridge arm circuit and a second bridge arm circuit in an inverter module in inverter embodiment 2 of the present invention;
fig. 7 is a first schematic diagram of an energy path in embodiment 2 of the inverter of the present invention;
fig. 8 is a second schematic diagram of an energy path in inverter embodiment 2 of the present invention;
fig. 9 is a schematic diagram of an output voltage waveform of a circuit configuration of a multimode single-phase system in embodiment 2 of the inverter in the present invention;
FIG. 10 is a schematic diagram of the connection of components in the inverter embodiment 3 of the invention;
FIG. 11 is a schematic diagram of the connection of components in the inverter embodiment 4 of the invention;
fig. 12 is a schematic diagram of connection of components in inverter embodiment 5 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should be noted that the terms of orientation such as left, right, up, down, etc. in the present embodiment are only relative concepts or reference to the normal use state of the product, and should not be considered as limiting.
When using as outdoor all-in-one to the domestic energy storage inverter of split phase grid structure, the problem of inverter double-phase power such as single-phase output can not be based on cost and circuit structure's consideration simultaneously: the scheme of the invention is provided from the starting point of low cost and high reliability.
System implementation mode
Example 1
Referring to fig. 1, fig. 1 is a schematic block diagram of an inverter in accordance with embodiment 1 of the present invention; an inverter with split-phase and multi-mode single-phase output switching comprises a dc power supply module 100, an inverter module 200, and a switching module (not shown in the figure); the inverter module 200 is electrically connected to the dc power supply module 100 and the switching module (not shown); the switching module (not shown in the figures) comprises a diverter switch 310, a split phase ac grid; the inverter module 200 includes a first bridge arm circuit and a second bridge arm circuit; a first end of the change-over switch 310 is electrically connected to the output end of the second bridge arm circuit and the first end of the split-phase ac power grid, respectively, and a second end is electrically connected to the output end of the first bridge arm circuit and the second end of the split-phase ac power grid: when the switch 310 is turned off, the inverter has a circuit structure of a split-phase system; when the switch 310 is closed, the inverter has a double-current multi-mode single-phase (Mux-single phase) system circuit structure.
In the present embodiment, the first arm circuit and the second arm circuit are connected in parallel, and their input terminals are connected to the output terminal of the DC power supply module 100, specifically, may be connected to the output terminal of the DC-DC unit in the DC power supply module 100.
In this embodiment, the switch 310 mainly functions to control the operation of the two bridge arm circuits in the inverter module 200, so as to switch the inverter circuit structure from the split-phase system circuit structure to the double-current multi-mode single-phase system circuit structure, thereby meeting the requirement that when the split-phase grid-structured household energy storage inverter is used as an outdoor all-in-one machine, double split-phase single-phase output power and current are output without changing the hardware circuit and devices of the inverter itself, and meeting the requirement of a high-power load device.
Direct current power supply module 100 includes PV tracking unit, MPPT functional circuit and battery in this application, and the DC-DC unit can utilize the electric wire netting to charge the battery through closed switch when inserting split phase alternating current electric wire netting, utilizes the battery to carry out off-grid power supply to the load in the system when disconnected net.
In the present embodiment, when the inverter is in the split-phase system circuit configuration, single-phase output power and current are output as a whole, and when the multi-mode single-phase system circuit configuration, double single-phase output power and current are output.
Example 2
Unlike embodiment 1, the changeover switch 310 in the present embodiment further includes a first switch and a second switch; the first switch and the second switch are connected in series to form a change-over switch 310;
the split-phase alternating current power grid in the embodiment comprises a first input unit and a second input unit; the second end of the first input unit and the second end of the second input unit are connected in series to form an alternating current power grid.
A first end of the switch 310 is electrically connected to the second output end of the inverter module 200 and a first end of the first input unit (Vac 1), respectively; a second terminal of the switch 310 is electrically connected to the first output terminal of the inverter module 200 and the first terminal of the second input unit (Vac 2), respectively.
As shown in fig. 2, fig. 2 is a schematic diagram of connection of components in embodiment 2 of the inverter of the present invention; specifically, the electronic device in embodiment 2 includes:
the circuit connection structure of the power amplifier comprises a first power tube Q1, a second power tube Q2, a third power tube Q3, a fourth power tube Q4, a first current sensor CT1, a second current transformer CT2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1 and a second inductor L2, and is shown in fig. 2.
The first capacitor C1 and the second capacitor C2 are bus capacitors with equivalent capacities, the third capacitor C3 and the fourth capacitor C4 are inverter output filter capacitors, and the third capacitor C3 and the fourth capacitor C4 have equivalent capacities. The inductor comprises a first inductor L1, a second inductor L2, and the inductance of the first inductor L1 is equivalent to that of the second inductor L2. The first input unit (Vac 1) and the second input unit (Vac 2) output inverter voltages.
The first switch and the second switch in the switch 310 may be a relay switch S1 and a relay switch S2, respectively, the relay switches S1 and S2 control the switching between the split-phase system circuit structure and the multi-mode single-phase system circuit structure, when the relay switches S1 and S2 are turned off, the inverter presents the split-phase system structure, when the relay switches S1 and S2 are turned on, the system presents a double-current multi-mode single-phase system, the equivalent circuit thereof is as shown in fig. 3, and fig. 3 is an equivalent circuit diagram of the double-current multi-mode single-phase system of the inverter in the present invention.
Further, in the present embodiment, the first power transistor Q1 and the third power transistor Q3 form a first arm circuit, and the second power transistor Q2 and the fourth power transistor Q4 form a second arm circuit. The first bridge arm circuit and the second bridge arm circuit are connected in parallel, and the control method can be divided into two methods:
the method comprises the following steps: the first bridge arm circuit and the second bridge arm circuit are driven to be on and off simultaneously, the first power tube Q1 and the second power tube Q2 are driven synchronously, the third power tube Q3 and the fourth power tube Q4 are driven synchronously, the first power tube Q1 is complementary with the third power tube Q3, and the second power tube Q2 is complementary with the fourth power tube Q4. Fig. 5 shows a driving timing sequence and currents (IL 1, IL 2) of the first inductor and the second inductor, and fig. 5 is a first schematic diagram of the driving timing sequence and the inductor current of the first bridge arm circuit and the second bridge arm circuit in the inverter module 200 of the inverter embodiment 2 of the present invention. Wherein the IL1 and IL2 currents overlap.
The total output current is the sum of the first inductor current IL1 and the second inductor current IL2 (the current flowing through the capacitors C3 and C4).
The method 2 comprises the following steps: the first bridge arm circuit and the second bridge arm circuit are driven by 180 degrees in a staggered mode, the first power tube Q1 and the second power tube Q2 are driven by 180 degrees in a staggered mode, the first power tube Q1 is complementary with the third power tube Q3, and the second power tube Q2 is complementary with the fourth power tube Q4. Fig. 6 shows a driving timing and currents (IL 1, IL 2) in the first inductor and the second inductor, and fig. 6 is a second schematic diagram of the driving timing and the inductor current of the first bridge arm circuit and the second bridge arm circuit in the inverter module 200 of the inverter embodiment 2 of the present invention. The IL1 and IL2 currents are overlapped in a staggered mode, and the total output current ripple is 1/2 of that of the scheme 1.
The control method of the method 2 has the advantages that the current ripple becomes 1/2 of the original value when the current is output, the magnetic core loss of the inductor is reduced, and the output current THDI is lower.
The working principle of the multimode single phase is shown in fig. 7 and 8, and fig. 7 is a first schematic diagram of an energy path in an inverter embodiment 2 in the invention; fig. 8 is a second schematic diagram of an energy path in inverter embodiment 2 of the present invention.
When the first power tube Q1 and the second power tube Q2 are turned on, the flow direction of the energy path 1 is as follows:
from the positive pole of the first capacitor C1- > the first power tube Q1- > the second inductor L2- > the parallel connection of the third capacitor C3 and the fourth capacitor C4- > the negative pole of the first capacitor C1.
When the first power tube Q1 and the second power tube Q2 are turned on, the flow direction of the energy path 2 is:
from the positive pole of the first capacitor C1- > the second power tube Q2- > the first inductor L1- > the parallel connection of the third capacitor C3 and the fourth capacitor C4- > the negative pole of the first capacitor C1.
When the third power tube Q3 and the fourth power tube Q4 are turned on, the flow direction of the energy path 1 is:
from the positive pole of the second capacitor C2- > the parallel connection of the third capacitor C3 and the fourth capacitor C4- > the second inductor L2- > the third power tube Q3- > the negative pole of the second capacitor C2.
When the third power tube Q3 and the fourth power tube Q4 are turned on, the flow direction of the energy path 2 is:
from the positive pole of the second capacitor C2- > the parallel connection of the third capacitor C3 and the fourth capacitor C4- > the first inductor L1- > the fourth power tube Q4- > the negative pole of the second capacitor C2.
Thus, the output voltage Vac can be generated in a half-bridge operation mode in each switching period, as shown in fig. 9, and fig. 9 is a schematic diagram of the output voltage waveform of the circuit structure of the multi-mode single-phase system in the inverter embodiment 2 of the present invention.
Example 3
In this embodiment, the topology of the inversion and output circuit is as shown in fig. 10, and fig. 10 is a schematic connection diagram of components in the inverter embodiment 3 of the present invention; unlike embodiment 2, in this embodiment, the switching module (not shown in the figure) further includes a fifth switch, a sixth switch (S5, S6), a third switch, and a fourth switch (S3, S4).
The electronic device in this embodiment includes:
the power supply comprises a first power tube Q1, a second power tube Q2, a third power tube Q3, a fourth power tube Q4, a first current sensor CT1, a second current transformer CT2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, a fifth switch, a sixth switch (S5, S6), a third switch and a fourth switch (S3, S4), and the circuit connection structure is as shown in FIG. 10.
The first capacitor C1 and the second capacitor C2 are bus capacitors with equivalent capacities, the third capacitor C3 and the fourth capacitor C4 are inverter output filter capacitors, and the third capacitor C3 and the fourth capacitor C4 have equivalent capacities. The inductor comprises a first inductor L1, a second inductor L2, and the inductance of the first inductor L1 is equivalent to that of the second inductor L2.
The first input unit (Vac 1) and the second input unit (Vac 2) output inverter voltages. The third switch and the fourth switch (S3, S4) are split-phase off-grid output relay switches, and the first off-line output unit and the second off-line output unit (VEPS 1, VEPS 2) output off-line voltages. The fifth switch and the sixth switch (S5, S6) are bypass relay switches in the split-phase power grid structure.
The first switch and the second switch in the switch 310 may be a relay switch S1 and a relay switch S2, respectively, where the relay switches S1 and S2 control the switching between the split-phase system circuit structure and the multi-mode single-phase system circuit structure, when the relay switches S1 and S2 are turned off, the inverter assumes the split-phase system structure, and when the relay switches S1 and S2 are turned on, the system assumes the double-current multi-mode single-phase system, as shown in fig. 9.
The working principle of this embodiment is under the normal domestic condition, and the electric wire netting structure is split phase structure, can let the commercial power supply for the load that connects at VEPS1, VEPS2 end through fifth switch, sixth switch (S5, S6) closure, if close third switch, fourth switch (S3, S4), then can be through commercial power to the battery charges simultaneously. And when the mains supply is powered off, the relay enters an off-grid state by disconnecting the fifth switch and the sixth switch (S5, S6), and the VEPS1 and the VEPS2 are supplied with power through battery energy and transmitted to the load. When a user needs to output single-phase higher power, the inverter can close the relays S1 and S2 through a selection mode, the relays of the third switch and the fourth switch (S3 and S4) are disconnected, the inverter outputs power to the load at the Mux-single output end, and the output current and power are the sum of the current and power at the ends of the VEPS1 and the VEPS 2.
Example 4
As shown in fig. 11, fig. 11 is a schematic connection diagram of components in inverter embodiment 4 of the present invention; different from embodiment 3, in the present embodiment, a T-type topology module 210 is added to the inverter module 200, and specifically, the T-type topology module 210 includes a fifth power tube Q5, a sixth power tube Q6, a seventh power tube Q7, and an eighth power tube Q8; the topology of the inverting and output circuit in this embodiment is shown in fig. 11.
The working principle is as follows:
under the normal domestic condition, the electric wire netting structure is split phase structure, can let the commercial power supply power for the load that connects at VEPS1, VEPS2 end through fifth switch, sixth switch (S5, S6) closure, if close third switch, fourth switch (S3, S4), then can pass through the commercial power to charge for the battery simultaneously. And after the mains supply is powered off, the relay enters an off-grid state by disconnecting the fifth switch and the sixth switch (S5, S6), and the energy of the battery is transmitted to the VEPS1 and the VEPS2 to supply power to the load. When a user needs to output single-phase higher power, the inverter can close the first switch and the second switch (S1 and S2) of the relay through selecting a mode, the third switch and the fourth switch (S3 and S4) of the relay are opened, the inverter outputs power to a load at a Mux-single output end, and the output current and the power are the sum of the current and the power at the VEPS1 end and the VEPS2 end.
Example 5
As shown in fig. 12, fig. 12 is a schematic connection diagram of components of an inverter embodiment 5 in the invention; embodiment 3 is different from that in this embodiment, a first I-type topology unit 220 and a second I-type topology unit 230 are added in the inverter module 200, and the first I-type topology unit 220 includes a first diode, a third diode, a fifth power tube, and an eighth power tube;
the second I-type topology unit 230 includes a second diode, a fourth diode, a sixth power tube, and a seventh power tube; the topology of the inverting and output circuit in this embodiment is shown in fig. 11.
Under the normal domestic condition, the electric wire netting structure is split phase structure, can let the commercial power supply power for the load that connects at VEPS1, VEPS2 end through fifth switch, sixth switch (S5, S6) closure, if close third switch, fourth switch (S3, S4), then can pass through the commercial power to charge for the battery simultaneously. And when the mains supply is powered off, the relay enters an off-grid state by disconnecting the fifth switch and the sixth switch (S5, S6), and the energy of the battery is transmitted to the VEPS1 and the VEPS2 to supply power to the load. When a user needs to output single-phase higher power, the inverter can close the first switch and the second switch (S1 and S2) of the relay through selecting a mode, the third switch and the fourth switch (S3 and S4) of the relay are opened, the inverter outputs power to a load at a Mux-single output end, and the output current and the power are the sum of the current and the power at the VEPS1 end and the VEPS2 end.
Method embodiment
A method with split-phase and multi-mode single-phase output switching, which employs the inverter of the first aspect, includes:
The inverter module 200 includes a first bridge arm circuit and a second bridge arm circuit; a first end of the change-over switch 310 is electrically connected to an output end of the second bridge arm circuit and a first end of the split phase ac power grid, respectively, and a second end is electrically connected to an output end of the first bridge arm circuit and a second end of the split phase ac power grid: when the switch 310 is turned off, the inverter has a circuit structure of a split-phase system; when the switch 310 is closed, the inverter has a double current multimode single phase system circuit structure.
In the present embodiment, the first arm circuit and the second arm circuit are connected in parallel, and their input terminals are connected to the output terminal of the DC power supply module 100, specifically, may be connected to the output terminal of the DC-DC unit in the DC power supply module 100.
Preferably, the handover method further includes: and step 400, driving the bridge arm circuits to work simultaneously/respectively with the phase difference of 180 degrees.
When the driving is carried out by staggering 180 degrees, the IL1 and IL2 currents are staggered and superposed, and the total output current ripple is 1/2 of that of the scheme 1. The staggered 180-degree switch control can effectively reduce the ripple and temperature rise of the bus capacitor, and can maintain the bus capacitor of the original split-phase system circuit structure.
The scheme of the invention has the following technical effects:
1) The inverter circuit can be automatically switched from a split-phase system circuit structure to a multi-mode single-phase system circuit structure through the change-over switch;
2) The multi-mode single-phase structure is formed by connecting 2 paths of half-bridge arm circuits in parallel, and the power tube driving mode is that the two half-bridge arm circuits can be synchronously switched or staggered for 180-degree switching. The staggered 180-degree switch control can effectively reduce the ripple and temperature rise of the bus capacitor and can maintain the bus capacitor of the original split-phase system circuit structure.
3) The current sensors CT1 and CT2 and the inductors L1 and L2 of the multi-mode single-phase system circuit structure can be output in double split-phase single-phase output power and current under the condition that the rated requirements of the split-phase system circuit structure are kept the same.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An inverter with split-phase and multi-mode single-phase output switching, comprising:
a DC power supply module;
an inversion module;
a switching module;
the inversion module is electrically connected with the direct current power supply module and the switching module respectively;
the switching module includes:
a switch;
a split phase AC electrical network;
the inversion module comprises a first bridge arm circuit and a second bridge arm circuit;
the first bridge arm circuit and the second bridge arm circuit are connected in parallel to the output end of the direct current power supply module;
the first end of the change-over switch is respectively and electrically connected with the output end of the second bridge arm circuit and the first end of the split-phase alternating current power grid, and the second end of the change-over switch is electrically connected with the output end of the first bridge arm circuit and the second end of the split-phase alternating current power grid:
when the change-over switch is switched off, the inverter is in a split-phase system circuit structure;
when the switch is closed, the inverter is in a double-current multi-mode single-phase system circuit structure.
2. The inverter of claim 1, wherein the transfer switch comprises:
a first switch and a second switch;
the first switch and the second switch are connected in series to form the change-over switch;
the split-phase alternating current power grid comprises a first input unit and a second input unit;
the second end of the first input unit and the second end of the second input unit are connected in series to form the alternating current power grid;
the first end of the change-over switch is respectively and electrically connected with the second output end of the inversion module and the first end of the first input unit;
and the second end of the change-over switch is respectively and electrically connected with the first output end of the inversion module and the first end of the second input unit.
3. The inverter of claim 2, wherein the switching module further comprises:
a third switch and a fourth switch;
a fifth switch and a sixth switch;
a second end of the fifth switch is electrically connected with a first end of the first input unit, and a first end of the fifth switch is electrically connected with a second end of the third switch and the first off-line output unit respectively;
the first end of the third switch is electrically connected with the first end and the second output end of the change-over switch;
the second end of the sixth switch is electrically connected with the second end of the second input unit, and the first end of the sixth switch is electrically connected with the second end of the fourth switch and the second off-line output unit respectively;
the first end of the fourth switch is electrically connected with the second end and the first output end of the change-over switch;
a first end of the double current multi-mode single phase system circuit configuration is electrically connected to a series connection point of the first switch and the second switch;
the second end of the double-current multi-mode single-phase system circuit structure is electrically connected with the series connection point of the third output end and the first end of the first input unit;
the third output end is a series connection point of the first off-line output unit and the second off-line output unit.
4. The inverter of claim 3, wherein the first leg circuit comprises:
a first power tube and a third power tube;
the second leg circuit includes:
a second power tube and a fourth power tube;
the inverter module further includes:
the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the first current transformer, the second current transformer, the first inductor and the second inductor;
the first end of the first capacitor is respectively and electrically connected with the first end of the DC-DC unit, the first end of the first power tube and the first end of the second power tube, the second end of the first capacitor is connected with the first end of the second capacitor, the series connection point of the second end of the third capacitor and the first end of the fourth capacitor, the third output end, the second end of the first input unit and the series connection point of the first end of the second input unit are connected in common, and a first common connection point is formed;
the first end of the third capacitor is connected with the second end of the first inductor, the first end of the change-over switch and the first end of the third switch in common;
the first end of the first inductor is electrically connected with the second end of the first current transformer;
the second end of the fourth capacitor is electrically connected with the second end of the second inductor, the second end of the change-over switch and the second end of the fourth switch in common;
the first end of the second inductor is electrically connected with the second end of the second current transformer;
the second end of the second capacitor is electrically connected with the second end of the DC-DC unit, the second end of the third power tube and the second end of the fourth power tube;
the second end of the first power tube, the first end of the second power tube and the first end of the second current transformer are connected in common;
and the second end of the second power tube, the first end of the fourth power tube and the first end of the first current transformer are connected in common.
5. The inverter of claim 4, wherein the inverter module further comprises:
a T-type topology module;
and the first end of the T-shaped topological module is electrically connected with the second output end, the second end of the T-shaped topological module is electrically connected with the first output end, and the third end of the T-shaped topological module is electrically connected with the direct current power supply module.
6. The inverter of claim 5, wherein the T-topology module comprises:
a fifth power tube, a sixth power tube, a seventh power tube and an eighth power tube;
a second end of the fifth power tube is connected in series with a first end of the sixth power tube, and a second end of the seventh power tube and a first end of the eighth power tube are connected in series;
the first end of the fifth power tube and the first end of the seventh power tube are connected with the first common junction point;
the second end of the sixth power tube is connected with the first end of the first current transformer;
and the second end of the eighth power tube is connected with the first end of the third power tube and the first end of the second current transformer.
7. The inverter of claim 4, wherein the inversion module further comprises:
a first I-type topology unit and a second I-type topology unit;
two ends of the first I-type topological unit are respectively and electrically connected with two ends of the first bridge arm circuit;
and two ends of the second I-type topological unit are respectively and electrically connected with two ends of the second bridge arm circuit.
8. The inverter of claim 7, wherein the first type I topology cell comprises:
the power supply comprises a first diode, a third diode, a fifth power tube and an eighth power tube;
the second type I topology unit includes:
the power supply comprises a second diode, a fourth diode, a sixth power tube and a seventh power tube;
the fifth power tube and the eighth power tube are sequentially connected in series between the first power tube and the third power tube, the cathode of the first diode is connected between the first power tube and the fifth power tube, the anode of the third diode is connected between the eighth power tube and the third power tube, the anode of the first diode is connected with the cathode of the third diode, and the connecting point is connected with the first common point;
a first output end is led out from between the fifth power tube and the eighth power tube and is electrically connected with a first end of the second current transformer;
the sixth power tube and the seventh power tube are sequentially connected in series between the second power tube and the fourth power tube, the cathode of the second diode is connected between the second power tube and the sixth power tube, the anode of the fourth diode is connected between the fourth power tube and the seventh power tube, the anode of the second diode is connected with the cathode of the fourth diode, and the connecting point is connected with the first common point;
and a first output end is led out from between the sixth power tube and the seventh power tube and is electrically connected with the first end of the first current transformer.
9. A method for switching between split-phase and multi-mode single-phase outputs using the inverter of any of claims 1-8, comprising:
step 100, connecting the output end of a bridge arm circuit of an inversion module with two ends of a selector switch respectively;
step 200, electrically connecting two ends of a change-over switch with two ends of a split-phase alternating current network respectively;
step 300, opening/closing the change-over switch to enable the inverter to be in a split-phase system circuit structure/multi-mode single-phase system circuit structure;
the inversion module comprises two bridge arm circuits.
10. The method of claim 9, wherein the method further comprises:
and step 400, driving the bridge arm circuits to work simultaneously/respectively with the phase difference of 180 degrees.
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| CN117134642A (en) * | 2023-10-27 | 2023-11-28 | 深圳鹏城新能科技有限公司 | Inverter circuit control method, inverter circuit and energy storage device |
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Application publication date: 20221021 |