CN116231728A - Split phase topology for split phase power grid and control method thereof - Google Patents
Split phase topology for split phase power grid and control method thereof Download PDFInfo
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- CN116231728A CN116231728A CN202211726951.8A CN202211726951A CN116231728A CN 116231728 A CN116231728 A CN 116231728A CN 202211726951 A CN202211726951 A CN 202211726951A CN 116231728 A CN116231728 A CN 116231728A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
-
- 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
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Abstract
The split phase topology for the split phase power grid comprises a direct current bus filter capacitor structure, a first live wire output structure, a second live wire output structure and a zero line structure, wherein the first live wire output structure, the second live wire output structure and the zero line structure are led out from the middle point of the direct current bus filter capacitor structure. The first live wire output structure is used for connecting the first live wire of the split-phase power grid, the second live wire output structure is used for connecting the second live wire of the split-phase power grid, and the zero line structure is used for connecting the zero line of the split-phase power grid. The first fire wire output structure and the second fire wire output structure are both composed of level bridge arms, and the level bridge arms corresponding to the first fire wire output structure are different from the level bridge arms corresponding to the second fire wire output structure. The method replaces the mode of realizing voltage output of different levels by additionally arranging a transformer split-phase or an external electronic sharer, thereby reducing the overall complexity of the system, reducing the use of system components and obviously reducing the workload of system configuration and installation and the system operation cost.
Description
Technical Field
The application relates to the technical field of power electronic converters, in particular to a split-phase topology for a split-phase power grid and a control method thereof.
Background
Split Phase (Split Phase), also known as Split Phase, refers to a single-Phase dc Split Phase that is a multi-Phase ac. Taking the power grid structure of North America and Japanese as an example, a common split-phase power grid has the requirement of 120V (240V combined phase) split-phase unbalanced load. Specifically, the split-phase power grid system is composed of two live wires and a neutral wire in the three-phase power grid system, and in general, the split-phase power grid system is provided with a first live wire L1, a second live wire L2 and a neutral wire N, the voltage of the first live wire L1 to the second live wire L2 is 202V or 240V (illustrated by 240V), the voltage of the first live wire L1 to the neutral wire N is 101V or 120V, and the voltage of the second live wire to the neutral wire is 101V or 120V.
In applications of the inverter to a split-phase power grid, the inverter needs to convert direct current into multi-phase alternating current of the split-phase power grid, for example: the photovoltaic inverter converts direct current generated by the photovoltaic panel into alternating current and is integrated into a public power grid; the photovoltaic panel and the energy storage battery (lithium battery and lead-acid battery) are mixed by the light storage hybrid inverter and are combined into a power grid or feed energy to a load; the ac-coupled inverter incorporates battery (lithium battery, lead-acid battery) dc power into the grid or feeds the load. However, one inverter can only output voltage of one power grid structure, such as a single-phase power grid 230V and a three-phase power grid 230/230/230 structure, and cannot output 120V/240V power grids at the same time, so that the output requirement of a split-phase power grid cannot be met. 4) In order to meet the demand of a split-phase power grid, a common mode is to connect a power frequency isolation transformer or an autotransformer at an off-grid output port of an inverter for split-phase, in this way, only 240v of one voltage class is output in an off-grid operation mode of the inverter, and the power frequency isolation transformer or the autotransformer for split-phase of the output voltage, so that two voltages of 120v and 240v can be obtained. However, in the common mode, due to the adoption of the power frequency isolation transformer or the autotransformer, the volume of the inverter is increased, the whole quality of the equipment is heavy, and the energy consumption of the additional transformer is added, so that the whole efficiency of the system is correspondingly reduced. Another way of realizing phase separation is to replace a power frequency isolation transformer or an autotransformer by adopting a way of connecting an electronic phase separator, however, the way of connecting the electronic phase separator is a loop formed by a switch tube, an inductor, a capacitor and other energy storage devices, so as to play a role in phase separation, the electronic phase separator can be regarded as adding a primary power conversion loop on the original system, and because more components are added, extra energy loss is naturally generated in the conversion process, and the equipment cost is further increased, so that the system configuration process is more complicated.
In summary, in the existing split-phase technology, if a transformer is used to perform single-split-phase power grid conversion, the defects of low conversion efficiency, high cost, difficulty in controlling the volume and weight of the equipment in the normal range of the household electrical appliance and the like are brought; when an electronic phase splitter is adopted to perform single-split phase power grid conversion, a first-stage topology is added at the back end of the original inversion topology, and a first-stage component and a capacitor inductor are added, so that extra energy loss is caused, the cost is increased, and the efficiency cannot be obviously improved; and the topology cannot carry unbalanced load, and belongs to an implementation scheme with high cost and poor performance. Therefore, the defect of the split-phase technology can be effectively avoided based on the improvement of the split-phase topological circuit of the inverter. If the application name of the application number is CN202010206115.1, namely a bidirectional conversion structure and an output control method suitable for a split-phase power grid, the bidirectional conversion structure is provided, the requirement of the split-phase power grid on an inverter is met, and the defect of the traditional split-phase technology is avoided.
Disclosure of Invention
Based on this, it is necessary to provide a split phase topology for a split phase power grid and a control method thereof, aiming at the defects existing in the conventional split phase related technology.
At least one embodiment of the present disclosure provides a split phase topology for a split phase power grid, comprising:
a DC bus filter capacitor structure;
the first live wire output structure, the second live wire output structure and the zero line structure are led out from the middle point of the direct current bus filter capacitor structure; the first live wire output structure is used for being connected with a first live wire of the split-phase power grid, the second live wire output structure is used for being connected with a second live wire of the split-phase power grid, and the zero line structure is used for being connected with a zero line of the split-phase power grid;
the first fire wire output structure and the second fire wire output structure are both composed of level bridge arms, and the level bridge arms corresponding to the first fire wire output structure are different from the level bridge arms corresponding to the second fire wire output structure.
The split phase topology for the split phase power grid comprises a direct current bus filter capacitor structure, and a first live wire output structure, a second live wire output structure and a zero line structure which are led out from the middle point of the direct current bus filter capacitor structure. The first live wire output structure is used for being connected with a first live wire of the split-phase power grid, the second live wire output structure is used for being connected with a second live wire of the split-phase power grid, and the zero line structure is used for being connected with a zero line of the split-phase power grid. The first fire wire output structure and the second fire wire output structure are both composed of level bridge arms, and the level bridge arms corresponding to the first fire wire output structure are different from the level bridge arms corresponding to the second fire wire output structure. Based on the method, a mode of realizing voltage output of different levels by additionally arranging a transformer split-phase or externally connecting an electronic sharer is replaced, so that the overall complexity of the system is reduced, the use of system components is reduced, and the workload of system configuration and installation and the system operation cost are obviously reduced.
In one embodiment, the direct current bus filter capacitor structure comprises a first filter capacitor and a second filter capacitor which are connected in series;
the connection point of the first filter capacitor and the second filter capacitor is a midpoint; the other end of the first filter capacitor and the other end of the second filter capacitor are used for connecting the first live wire output structure and the second live wire output structure except for the connecting point.
In one embodiment, the first and second live output structures are each comprised of three level legs.
In one embodiment, the first live wire output structure is a T-shaped three-level bridge arm, and the second live wire output structure is a straight-shaped three-level bridge arm.
In one embodiment, the first live output structure comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;
the source electrode of the first switching tube is connected with the source electrode of the fourth switching tube and is used for being connected with a first live wire; the second switching tube is connected with the source electrode of the third switching tube, the drain electrode of the second switching tube is connected with the midpoint, and the drain electrode of the third switching tube is connected with the source electrode of the first switching tube;
the drain electrode of the first switching tube and the drain electrode of the fourth switching tube are respectively connected with the direct current bus filter capacitor structure;
the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are used for being respectively connected with corresponding driving signals.
In one embodiment, the second live output structure comprises a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a first diode and a second diode;
the source electrode of the fifth switching tube is connected with the source electrode of the sixth switching tube, and the source electrode of the seventh switching tube is connected with the source electrode of the eighth switching tube; the drain electrode of the sixth switching tube is connected with the drain electrode of the seventh switching tube and is used for being connected with a second live wire;
the cathode of the first diode is connected with the source electrode of the fifth switch tube, and the anode of the first diode is connected with the cathode of the second diode and is used for being connected with the midpoint;
the drain electrode of the fifth switching tube and the drain electrode of the eighth switching tube are respectively connected with the direct current bus filter capacitor structure;
the grid electrode of the fifth switching tube, the grid electrode of the sixth switching tube, the grid electrode of the seventh switching tube and the grid electrode of the eighth switching tube are used for being respectively connected with corresponding driving signals.
In one embodiment, the method further comprises:
and the balance bridge topology is hung at two ends of the direct current bus filter capacitor structure.
In one embodiment, the balanced bridge topology includes a ninth switching tube and a tenth switching tube;
the source electrode of the ninth switching tube is connected with the source electrode of the tenth switching tube and is used for being connected with the midpoint;
the drain electrode of the ninth switching tube and the drain electrode of the tenth switching tube are respectively connected with the direct current bus filter capacitor structure.
In one embodiment, the method further comprises:
one end of the first inductor is connected with the first live wire output structure, and the other end of the first inductor is connected with the first live wire;
one end of the second inductor is connected with the second live wire output structure, and the other end of the second inductor is connected with the second live wire;
one end of the first capacitor is connected with the first live wire output structure, and the other end of the first capacitor is connected with the zero line;
and one end of the second capacitor is connected with the second live wire output structure, and the other end of the second capacitor is connected with the zero line.
A control method for split phase topology of a split phase power grid, comprising the steps of:
in the split phase topology for the split phase power grid, two switching tubes in a pair are set to be complementarily driven.
According to the control method for the split phase topology of the split phase power grid, in the split phase topology of the split phase power grid, the two switching tubes in pairs are set to be driven in a complementary mode, so that the split phase balanced load and the split phase work unbalanced load are realized in each positive and negative half cycle work mode.
Drawings
FIG. 1 is a schematic diagram of a split phase topology module for a split phase power grid according to an embodiment;
FIG. 2 is a split phase topology block diagram for a split phase power grid according to one disclosed embodiment;
FIG. 3 is a flow chart of a control method for split phase topology of a split phase power grid according to an embodiment;
FIG. 4 is a timing chart of driving signals of the first and second switching transistors;
FIG. 5 is a timing chart of driving signals of the third switching tube and the fourth switching tube;
FIG. 6 is a timing chart of driving signals of the fifth switching tube and the sixth switching tube;
FIG. 7 is a timing diagram of driving signals of the seventh switching tube and the eighth switching tube;
FIG. 8 is a timing chart of driving signals of the ninth and tenth switching transistors;
FIG. 9 is a diagram of a split phase equilibrium load (phase-closed) L1 phase positive half-cycle freewheel path;
FIG. 10 is a diagram of a split phase equilibrium load (phase-closed) L1 phase positive half-cycle freewheel path;
FIG. 11 is a diagram of a split phase equilibrium load (phase-closed) L1 negative positive half-cycle working path;
FIG. 12 is a diagram of a split phase equilibrium load (phase-closed) L1 negative positive half-cycle freewheel path;
FIG. 13 is a graph of the positive half-cycle L1 operating path with split phase operating imbalance load PL1> PL 2;
FIG. 14 is a graph of the positive half-cycle freewheel path for L1 with split-phase operating unbalance loading PL1> PL 2;
FIG. 15 is a graph of the negative half-cycle operating path for L1 under split phase operating imbalance loads PL1< PL 2;
fig. 16 is a diagram of the negative half-cycle operation path of L1 under split phase operation unbalance load PL1< PL 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits a detailed description of some known functions and known components.
At least one embodiment of the present disclosure provides a split phase topology for a split phase power grid.
Fig. 1 is a schematic diagram of a split-phase topology module for a split-phase power grid according to an embodiment, as shown in fig. 1, the split-phase topology for the split-phase power grid according to an embodiment includes:
a DC bus filter capacitor structure 100;
a first live wire output structure 200, a second live wire output structure 201 and a zero line structure 202 led out from the midpoint O of the DC bus filter capacitor structure 100; wherein, the first live wire output structure 200 is used for connecting the first live wire e of the split-phase power grid AN The second live wire output structure 201 is used for connecting with a second live wire e of the split-phase power grid BN The zero line structure 202 is used for connecting a zero line N of the split-phase power grid;
the first live wire output structure 200 and the second live wire output structure 201 are both formed by level bridge arms, and the level bridge arm corresponding to the first live wire output structure 200 is different from the level bridge arm corresponding to the second live wire output structure 201.
As shown in fig. 1, the split phase topology for the split phase power grid is provided with one side for connecting with a direct current device, such as a photovoltaic power generation array, a direct current source and the like, and realizes alternating current output under PWM control through different working path control of a level bridge arm, and finallyIs at the first live wire e when off-line AN And a second live wire e BN Alternating currents with different voltage levels are output, and typically, two voltages of 120V and 240V are output. The control of different working paths of the level bridge arm mainly realizes the circuit construction of different current paths through the on-off control of a switching tube, and realizes different operation modes.
The dc BUS filter capacitor structure 100 is configured to filter the dc side and obtain a stable dc voltage output at the midpoint O based on the positive BUS and the negative BUS. The dc bus filter capacitor structure 100 is generally designed with symmetrical capacitor connection, and the symmetry point is taken as the midpoint O. For example, the capacitor is formed by connecting N capacitors in series, each side is provided with N/2 capacitors, and the voltage of the capacitors at two sides is positive and negative.
In one embodiment, fig. 2 is a split-phase topology structure diagram of a split-phase power grid according to an embodiment of the disclosure, and as shown in fig. 2, the dc bus filter capacitor structure includes a first filter capacitor C connected in series Pbus And a second filter capacitor C Nbus ；
Wherein, the first filter capacitor C Pbus The connection point of the second filter capacitor is a midpoint O; a first filter capacitor C except for the connection point Pbus And a second filter capacitor C Nbus The other end of which is used for connecting the first live wire output structure and the second live wire output structure.
As shown in fig. 2, a first filter capacitor C Pbus One side is a positive BUS, a second filter capacitor C Nbus One side is a negative BUS, and the connecting point of the negative BUS and the negative BUS is used as a midpoint O and is respectively connected with a three-phase line of the split-phase power grid. The midpoint is directly connected with the zero line and is connected with the first live wire e AN Is connected with the second fire wire e through the first fire wire output structure BN Is connected through a second live wire output structure.
The level bridge arm corresponding to the first fire wire output structure is different from the level bridge arm corresponding to the second fire wire output structure. As the application name of the application number CN202010206115.1 is "a bidirectional conversion structure and an output control method suitable for split-phase power grid", it can be seen that the two level bridge arms are designed symmetrically and the level bridge arms of the first live wire output structure and the second live wire output structure in the embodiment of the disclosure are different, which is more favorable for coping with the working mode of unbalanced load of split-phase work.
The first live wire output structure and the second live wire output structure are used for forming an inverter working core of split phase topology, and the selection of the corresponding level bridge arm can be flexibly selected according to the working environment of the split phase topology. But the core is that the first live wire output structure and the second live wire output structure adopt different topological options to effectively cope with unbalanced load of split phase work.
In one embodiment, the first and second live output structures are each comprised of three level legs.
One side of the three-level bridge arm is connected with the positive BUS, and the other side of the three-level bridge arm is connected with the negative BUS to establish working logic, and the working logic is adjusted according to an external driving signal. And the input and the output of the three-level bridge arm are respectively connected with the middle point and the fire wire (the first fire wire or the second fire wire), and different current working paths are established between the input and the output according to the driving of the three-level bridge arm. Meanwhile, three-level bridge arms adopted by the first live wire output structure and the second live wire output structure are different, and the two are subjected to different type selection. As a preferred implementation mode, the first fire wire output structure is a T-shaped three-level bridge arm, and the second fire wire output structure is a straight-shaped three-level bridge arm.
In one embodiment, as shown in FIG. 2, the first fire wire output structure comprises a first switching tube S a1 Second switch tube S a2 Third switch tube S a3 And a fourth switching tube S a4 ；
Wherein, a first switch tube S a1 Source electrode and fourth switch tube S a4 Is connected to the source of the first live wire e AN The method comprises the steps of carrying out a first treatment on the surface of the Second switching tube S a3 And a third switching tube S a4 Source electrode connection of the second switch tube S a2 A third switch tube S connected with the middle point O of the drain electrode a3 The drain electrode of (a) is connected with the first switch tube S a1 A source of (a);
wherein, a first switch tube S a1 Drain electrode of (d) and fourth switching tube S a4 Drain of (2)The filter capacitor structure is used for being respectively connected with the direct current bus;
wherein, a first switch tube S a1 Gate electrode of (a) second switch tube S a2 Gate electrode of (d), third switch tube S a3 Gate and fourth switching tube S a4 The gates of which are used for respectively accessing corresponding driving signals.
In one embodiment, as shown in FIG. 2, the second live output structure includes a fifth switching tube S b1 Sixth switching tube S b2 Seventh switching tube S b3 Eighth switching tube S b4 A first diode D1 and a second diode D2;
fifth switch tube S b1 Is connected with a sixth switching tube S b2 Source of the seventh switching tube S b3 Is connected with an eighth switching tube S b4 A source of (a); sixth switching tube S b2 The drain electrode of (C) is connected with a seventh switching tube S b3 And is used for connecting with a second live wire e BN ；
The cathode of the first diode D1 is connected with a fifth switch tube S b1 The anode of the first diode D1 is connected with the cathode of the second diode D2 and is used for being connected with the midpoint O;
wherein, the fifth switch tube S b1 Drain electrode of (d) and eighth switching tube S b4 The drains of the capacitor are respectively connected with a direct current bus filter capacitor structure;
wherein, the fifth switch tube S b1 Gate electrode of (d), sixth switching tube S b2 Gate electrode of (d), seventh switching tube S b3 Gate and eighth switching tube S of (C) b4 The gates of which are used for respectively accessing corresponding driving signals.
In one embodiment, the split phase topology for a split phase power grid further comprises:
and the balance bridge topology is hung at two ends of the direct current bus filter capacitor structure.
The balance bridge topology is hung at two ends of the direct current BUS filter capacitor structure, and the on-off of the positive BUS to the middle point and the on-off of the negative BUS to the middle point are respectively controlled to balance the voltage between the positive BUS and the negative BUS and stabilize more energy during the working of the split phase.
In one of themIn an embodiment, as shown in fig. 2, the balanced bridge topology comprises a ninth switching tube S up And a tenth switching tube S dn ；
Ninth switch tube S up Source electrode of (C) is connected with tenth switch tube S dn And is used for connecting the midpoint O;
wherein, the ninth switching tube S up Drain electrode of (c) and tenth switching tube S dn The drains of the capacitor are respectively connected with the DC bus filter capacitor structure.
In one embodiment, as shown in fig. 2, the split phase topology for the split phase power grid further includes:
first inductance L1, one end is connected with the first fire wire output structure, and the other end is connected with the first fire wire e AN ；
A second inductor L2, one end of which is connected with the second live wire output structure and the other end of which is connected with a second live wire e BN ；
A third capacitor L3 with one end connected to the midpoint and the other end connected to the ninth switching tube S up A source of (a);
one end of the first capacitor Ca is connected with the first live wire output structure, and the other end of the first capacitor Ca is connected with the zero line N;
and one end of the second capacitor Cb is connected with the second live wire output structure, and the other end of the second capacitor Cb is connected with the zero line N.
The first inductor L1, the second inductor L2, the third inductor L3, the first capacitor Ca and the second capacitor Cb are used as auxiliary elements in the topology, and the operation stability of the topology is ensured with a low element number.
In one embodiment, the above-mentioned switching transistors (first switching transistor, second switching transistor, third switching transistor, fourth switching transistor, fifth switching transistor, sixth switching transistor, seventh switching transistor, eighth switching transistor, ninth switching transistor and tenth switching transistor) may be, for example, gate turn-off thyristor (GTO), power transistor (GTR), power field effect transistor (VMOSFET), insulated Gate Bipolar Transistor (IGBT), integrated Gate Commutated Thyristor (IGCT), symmetrical Gate Commutated Thyristor (SGCT), and the like, which are flexibly selected according to the practical application of the topology.
The split phase topology for the split phase power grid of any one of the embodiments includes a dc bus filter capacitor structure, and a first live wire output structure, a second live wire output structure and a neutral wire structure led out from a midpoint of the dc bus filter capacitor structure. The first live wire output structure is used for being connected with a first live wire of the split-phase power grid, the second live wire output structure is used for being connected with a second live wire of the split-phase power grid, and the zero line structure is used for being connected with a zero line of the split-phase power grid. The first fire wire output structure and the second fire wire output structure are both composed of level bridge arms, and the level bridge arms corresponding to the first fire wire output structure are different from the level bridge arms corresponding to the second fire wire output structure. Based on the method, a mode of realizing voltage output of different levels by additionally arranging a transformer split-phase or externally connecting an electronic sharer is replaced, so that the overall complexity of the system is reduced, the use of system components is reduced, and the workload of system configuration and installation and the system operation cost are obviously reduced.
Based on the split phase topology for the split phase power grid of any one of the embodiments, the embodiments of the present disclosure further provide a control method for the split phase topology of the split phase power grid.
Fig. 3 is a flowchart of a control method for split-phase topology of a split-phase power grid according to an embodiment, as shown in fig. 3, the control method for split-phase topology of the split-phase power grid according to an embodiment includes step S100:
s100, setting two paired switching tubes to carry out complementary driving in split-phase topology for a split-phase power grid.
The two switching tubes connected with the source electrodes form a pair or two selected switching tubes form a pair for complementary driving, namely the driving signal logic of the pair of switching tubes is opposite at the same time, and the on and off of the pair of switching tubes form opposite logic.
To better explain the characterization of the control method for split phase topology of a split phase grid, the split phase topology for a split phase grid shown in fig. 2 is exemplified below:
FIG. 4 is a timing chart of driving signals of the first and second switching transistors;
FIG. 5 is a timing chart of driving signals of the third switching tube and the fourth switching tube;
FIG. 6 is a timing chart of driving signals of the fifth switching tube and the sixth switching tube;
FIG. 7 is a timing diagram of driving signals of the seventh switching tube and the eighth switching tube;
FIG. 8 is a timing chart of driving signals of the ninth and tenth switching transistors;
as shown in FIG. 4, a pair of first switching tubes S is set a1 And a second switching tube S a2 Is complementarily driven by the driving signals Sa1 and Sa 2; as shown in fig. 5, a pair of third switching tubes S is set a3 And a fourth switching tube S a4 Is complementarily driven by the driving signals Sa3 and Sa 4; as shown in fig. 6, a pair of fifth switching tubes S is set b1 And a sixth switching tube S b2 Is driven complementarily by the drive signals Sb1 and Sb 2; as shown in fig. 7, a pair of seventh switching tubes S is set b3 And an eighth switching tube S b4 Is driven complementarily by the drive signals Sb3 and Sb 4; as shown in fig. 8, a pair of ninth switching transistors S is set up And a tenth switching tube S dn Is driven complementarily by the drive signals Sup and Sdn of (a).
Through complementary drive, staggered on-off is set to be a pair of switching tubes, and two working modes of split phase working balance load and split phase working unbalance load are formed, as follows:
fig. 9 is a diagram of a normal half-cycle freewheel path of the split-phase equilibrium carrier (phase-closed) L1 phase, as shown in fig. 9, in which the energy flow directions of the split-phase topology in this mode are: first filter capacitor C Pbus First switch tube S a1 First inductance L1→first live wire e AN Second fire wire e BN Second inductance L2→eighth switching tube S b4 Second filter capacitor C Nbus 。
Fig. 10 is a diagram of a normal half-cycle freewheel path of the split-phase equilibrium carrier (phase-closed) L1 phase, as shown in fig. 10, in which the energy flow direction of the split-phase topology in this mode is: first inductance L1→first capacitance Ca→second capacitance Cb→second inductance L2→sixth switching tube S b2 Seven switch tube S b3 Third switch tube S a3 Second switching tube S a2 。
FIG. 11 is a diagram of a split phase balanced load (phase combining) L1 negative and positive half-cycle working path, as shown in FIG. 11, in which the energy flow direction of the split phase topology is the first filter capacitor C in order Pbus Fifth switch tube S b1 Second inductance L2→second live wire e BN First fire wire e AN First inductance L1→fourth switching tube S a4 Second filter capacitor C Nbus 。
FIG. 12 is a diagram showing a negative and positive half-cycle freewheeling path of a split-phase balanced load (phase-closed) L1, in which the energy flow direction is sequentially shown in FIG. 12 as the second inductance L2, the second capacitance Cb, the first capacitance Ca, the first inductance L1, the second switching tube S a2 Third switch tube S a3 Seven switch tube S b3 Fifth switch tube S b2 。
FIG. 13 shows a split phase working unbalance load PL1>The positive half-cycle operation path diagram of L1 under PL2 is shown in FIG. 13, and the energy flow in this mode is based on FIG. 9, which has more midpoint O→third inductance L3→tenth switching tube S dn Is provided for the energy flow path of (a).
FIG. 14 shows a split phase working unbalance load PL1>As shown in FIG. 14, the energy flow in this mode is based on FIG. 10, and a third inductance L3→a tenth switching tube S is added dn Is provided for the energy flow path of (a).
FIG. 15 shows a split phase working unbalance load PL1<L1 negative half cycle operation path diagram under PL2 is shown in FIG. 15, and the energy flow path in this mode is based on FIG. 11 by adding a ninth switching tube S up The third inductance l3→the energy flow path of the midpoint O.
FIG. 16 shows a split phase working unbalance load PL1<The negative half-cycle operation path diagram of L1 under PL2 is shown in FIG. 16, in which the energy flow path is based on FIG. 12 by adding a ninth switching tube S up The energy flow path of the third inductance L3.
As shown in fig. 9-16, under complementary driving, the split phase topology for the split phase power grid of the embodiments of the present disclosure can effectively implement the operation mode of the topology in response to both balanced load and unbalanced load modes.
According to the control method for the split phase topology of the split phase power grid, the two switching tubes connected with the source electrode are driven complementarily in the split phase topology of the split phase power grid, so that the split phase balanced load and the split phase work unbalanced load are realized in each positive and negative half cycle working mode.
For the purposes of this disclosure, the following points are also noted:
(1) The drawings of the embodiments of the present disclosure relate only to the structures to which the embodiments of the present disclosure relate, and reference may be made to the general design for other structures.
(2) In the drawings for describing embodiments of the present invention, thicknesses and dimensions of layers or structures are exaggerated for clarity. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
(3) The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict. The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure should be subject to the protection scope of the claims
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A split phase topology for a split phase electrical grid, comprising:
a DC bus filter capacitor structure;
the first live wire output structure, the second live wire output structure and the zero line structure are led out from the middle point of the direct current bus filter capacitor structure; the first live wire output structure is used for being connected with a first live wire of the split-phase power grid, the second live wire output structure is used for being connected with a second live wire of the split-phase power grid, and the zero line structure is used for being connected with a zero line of the split-phase power grid;
the first live wire output structure and the second live wire output structure are both composed of level bridge arms, and the level bridge arms corresponding to the first live wire output structure are different from the level bridge arms corresponding to the second live wire output structure.
2. The split phase topology for a split phase power grid of claim 1, wherein the dc bus filter capacitor structure comprises a first filter capacitor and a second filter capacitor connected in series;
the connection point of the first filter capacitor and the second filter capacitor is the midpoint; and the other end of the first filter capacitor and the other end of the second filter capacitor are used for connecting the first live wire output structure and the second live wire output structure except the connecting point.
3. The split phase topology for a split phase electrical network of claim 1, wherein said first and second live output structures are each comprised of three level legs.
4. A split phase topology for a split phase electrical network according to claim 3, wherein the first live output structure is a T-shaped three-level leg and the second live output structure is a straight-shaped three-level leg.
5. The split phase topology for a split phase power grid of claim 4, wherein said first live output structure comprises a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube;
the source electrode of the first switching tube is connected with the source electrode of the fourth switching tube and is used for being connected with a first live wire; the second switching tube is connected with the source electrode of the third switching tube, the drain electrode of the second switching tube is connected with the midpoint, and the drain electrode of the third switching tube is connected with the source electrode of the first switching tube;
the drain electrode of the first switching tube and the drain electrode of the fourth switching tube are used for being respectively connected with the direct-current bus filter capacitor structure;
the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are used for being respectively connected with corresponding driving signals.
6. The split phase topology for a split phase power grid of claim 4, wherein said second live output structure comprises a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a first diode, and a second diode;
the source electrode of the fifth switching tube is connected with the source electrode of the sixth switching tube, and the source electrode of the seventh switching tube is connected with the source electrode of the eighth switching tube; the drain electrode of the sixth switching tube is connected with the drain electrode of the seventh switching tube and is used for being connected with a second live wire;
the cathode of the first diode is connected with the source electrode of the fifth switch tube, and the anode of the first diode is connected with the cathode of the second diode and is used for connecting the midpoint;
the drain electrode of the fifth switching tube and the drain electrode of the eighth switching tube are respectively connected with the direct current bus filter capacitor structure;
the grid electrode of the fifth switching tube, the grid electrode of the sixth switching tube, the grid electrode of the seventh switching tube and the grid electrode of the eighth switching tube are used for being respectively connected with corresponding driving signals.
7. The split phase topology for a split phase power grid of claim 1, further comprising:
and the balance bridge topology is hung at two ends of the direct current bus filter capacitor structure.
8. The split phase topology for a split phase power grid of claim 7, wherein said balanced bridge topology comprises a ninth switching tube and a tenth switching tube;
the source electrode of the ninth switching tube is connected with the source electrode of the tenth switching tube and is used for being connected with the midpoint;
the drain electrode of the ninth switching tube and the drain electrode of the tenth switching tube are respectively connected with the direct current bus filter capacitor structure.
9. The split phase topology for a split phase power grid of claim 1, further comprising:
one end of the first inductor is connected with the first live wire output structure, and the other end of the first inductor is connected with the first live wire;
one end of the second inductor is connected with the second live wire output structure, and the other end of the second inductor is connected with the second live wire;
one end of the first capacitor is connected with the first live wire output structure, and the other end of the first capacitor is connected with the zero line;
and one end of the second capacitor is connected with the second live wire output structure, and the other end of the second capacitor is connected with the zero line.
10. A method for controlling split phase topology for a split phase power grid, comprising the steps of:
in the split phase topology for the split phase power grid, two switching tubes in a pair are set to be complementarily driven.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116455251A (en) * | 2023-06-14 | 2023-07-18 | 麦田能源股份有限公司 | Three-level converter and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116455251A (en) * | 2023-06-14 | 2023-07-18 | 麦田能源股份有限公司 | Three-level converter and control method thereof |
| CN116455251B (en) * | 2023-06-14 | 2023-08-29 | 麦田能源股份有限公司 | Three-level converter and control method thereof |
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