CN118249353B - Electric energy management topological structure based on primary energy conversion - Google Patents
Electric energy management topological structure based on primary energy conversion Download PDFInfo
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- CN118249353B CN118249353B CN202410628255.6A CN202410628255A CN118249353B CN 118249353 B CN118249353 B CN 118249353B CN 202410628255 A CN202410628255 A CN 202410628255A CN 118249353 B CN118249353 B CN 118249353B
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- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
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Classifications
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/2932—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 with automatic control of output voltage, current or power
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The embodiment of the invention relates to an electric energy management topological structure based on primary energy conversion, which comprises a pulse controller, a capacitor and an AC-AC module; the AC-AC module comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor; the first switch unit and the second switch unit form a first bridge arm, one end of the first bridge arm is connected with a first node, and the other end of the first bridge arm is connected with a second node; the third switch unit and the fourth switch unit form a second bridge arm, one end of the second bridge arm is connected with a third node, and the other end of the second bridge arm is connected with the second node; the pulse controller is used for controlling the related switch units to be turned off or turned on when the power supply voltage of the power grid is lower than 220v or higher than 220v so as to raise the voltage output to the load or lower the voltage output to the load. The embodiment of the invention can ensure the quality of output voltage.
Description
Technical Field
The invention relates to the technical field of distribution networks, in particular to an electric energy management topological structure based on primary energy conversion.
Background
The power quality of a power distribution network power supply area can influence the power supply quality, and low-quality power supply can cause the problems of increased power grid power line loss, equipment failure, power failure accidents and the like, and meanwhile production and life of users are influenced. In some power supply areas, the transformer outlet voltage is in a low voltage state due to seasonal and intermittent fluctuation of the load, and meanwhile, impact load aggravates the voltage fluctuation; when a large load is applied to the line terminal, the terminal power supply voltage is low. Particularly in mountain areas and remote areas, some areas have longer power supply radius, poor terminal power supply quality and low power supply reliability, and some new energy access occasions are easy to cause high voltage, so that the condition that the power supply voltage is higher or lower than the standard voltage (220V) frequently occurs; too high or too low a voltage can cause the user's power equipment to fail to work properly, which can have a significant impact on regional economy and social stability. For the situation that the power supply voltage of the power grid is too high and too low, certain measures are necessary to be taken for improvement.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the invention provides an electric energy management topological structure based on primary energy conversion.
The electric energy management topological structure based on the primary energy conversion is applied to a power supply loop, and the power supply loop is composed of a power grid power supply, a load and two connecting wires for connecting the power grid power supply and the load; the topology includes a pulse controller, a capacitor, and an AC-AC module, wherein:
the capacitor is arranged on a first connecting wire of the two connecting wires;
The AC-AC module comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor; the first switch unit and the second switch unit are connected in series to form a first bridge arm, one end of the first bridge arm is connected with a first node, and the other end of the first bridge arm is connected with a second node; the third switch unit and the fourth switch unit are connected in series to form a second bridge arm, one end of the second bridge arm is connected with a third node, and the other end of the second bridge arm is connected with the second node; the inductor is connected between the fourth node and the fifth node; the first node is a node between the power grid and the capacitor on the first connecting line, the second node is a node between the power grid and the load on a second connecting line of the two connecting lines, the third node is a node between the capacitor and the load on the first connecting line, and the fourth node is a connecting node of the first switch unit and the second switch unit; the fifth node is a connection node between the third switch unit and the fourth switch unit;
The pulse controller is connected to the first switching unit, the second switching unit, the third switching unit and the fourth switching unit; the pulse controller is used for: controlling the first switching unit to remain on and the second switching unit to remain off when the grid power supply voltage is lower than 220v, controlling each of the third switching unit and the fourth switching unit to alternately switch between on and off, and switching off one switching unit when the other switching unit is on so as to raise the voltage output to the load when the grid power supply voltage is lower than 220 v; when the power grid power supply voltage is higher than 220v, the third switch unit is controlled to be kept on and the fourth switch unit is controlled to be kept off, each of the first switch unit and the second switch unit is controlled to be alternately switched on and off, and when one of the first switch unit and the second switch unit is on, the other switch unit is turned off, so that the voltage output to the load is reduced when the power grid power supply voltage is higher than 220 v.
According to the electric energy management topological structure based on the primary energy conversion, when the power grid power supply voltage is lower than 220v, a pulse controller controls the first switch unit to be kept on and the second switch unit to be kept off, controls each of the third switch unit and the fourth switch unit to be alternately switched on and off, and switches off the other switch unit when one of the third switch unit and the fourth switch unit is switched on, so that the voltage output to the load is raised when the power grid power supply voltage is lower than 220 v; when the power grid power supply voltage is higher than 220v, the third switch unit is controlled to be kept on and the fourth switch unit is controlled to be kept off, each of the first switch unit and the second switch unit is controlled to be alternately switched on and off, and when one of the first switch unit and the second switch unit is on, the other switch unit is turned off, so that the voltage output to the load is reduced when the power grid power supply voltage is higher than 220 v. Thereby improving various problems caused by the fact that the output voltage of the power grid power supply for the load is lower than 220v or higher than 220 v. In addition, in the embodiment of the invention, the transformer structure in the prior art is replaced by a mode of connecting a capacitor in series in the power supply loop, so that the cost can be reduced and the efficiency can be improved. The embodiment of the invention adopts the AC-AC module of the primary energy conversion to replace the AC/DC+DC/AC framework of the secondary energy conversion in the prior art, thereby saving the cost. In a word, the topology structure provided by the embodiment of the invention has the advantages of reducing cost and improving efficiency when the voltage is increased or reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a topology for power management based on primary energy conversion in a power supply loop according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a topology of power management based on primary energy conversion in a power supply loop according to another embodiment of the present invention;
FIG. 3 is a block diagram of a topology for power management based on primary energy conversion in a power supply loop according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a specific topology of FIG. 3;
FIG. 5 is a schematic diagram of another specific topology of FIG. 3;
FIG. 6 is a schematic diagram illustrating a topology of power management based on primary energy conversion in a power supply loop according to another embodiment of the present invention;
FIG. 7 is an overall schematic diagram of an electrical energy management topology based on primary energy conversion applied in a three-phase system in accordance with one embodiment of the present invention.
Reference numerals: d1—a first node; d2—a second node; d3—a third node; d4—fourth node; d5—fifth node; D-1~D-28-diode; T1-T12-triode; l-inductance; c-capacitance; grid power in the first power supply loop in the Vga-three phase system; a grid power supply in a second power supply loop in the Vgb-three phase system; grid power in a third power supply loop in the Vgc-three phase system; a load in a first power supply loop in a Voa-three phase system; a load in a second supply loop in the Vob-three phase system; load in the third supply loop in the Voc-three phase system.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides an electric energy management topological structure based on primary energy conversion. Referring to fig. 1-3, the topology structure is applied in a power supply loop, wherein the power supply loop is composed of a power grid power supply, a load and two connecting wires for connecting the power grid power supply and the load; the topology includes a pulse controller, a capacitor, and an AC-AC module, wherein:
the capacitor is arranged on a first connecting wire of the two connecting wires;
The AC-AC module comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor; the first switch unit and the second switch unit are connected in series to form a first bridge arm, one end of the first bridge arm is connected with a first node, and the other end of the first bridge arm is connected with a second node; the third switch unit and the fourth switch unit are connected in series to form a second bridge arm, one end of the second bridge arm is connected with a third node, and the other end of the second bridge arm is connected with the second node; the inductor is connected between the fourth node and the fifth node; the first node is a node between the power grid and the capacitor on the first connecting line, the second node is a node between the power grid and the load on a second connecting line of the two connecting lines, the third node is a node between the capacitor and the load on the first connecting line, and the fourth node is a connecting node of the first switch unit and the second switch unit; the fifth node is a connection node between the third switch unit and the fourth switch unit;
The pulse controller is connected to the first switching unit, the second switching unit, the third switching unit and the fourth switching unit; the pulse controller is used for: controlling the first switching unit to remain on and the second switching unit to remain off when the grid power supply voltage is lower than 220v, controlling each of the third switching unit and the fourth switching unit to alternately switch between on and off, and switching off one switching unit when the other switching unit is on so as to raise the voltage output to the load when the grid power supply voltage is lower than 220 v; when the power grid power supply voltage is higher than 220v, the third switch unit is controlled to be kept on and the fourth switch unit is controlled to be kept off, each of the first switch unit and the second switch unit is controlled to be alternately switched on and off, and when one of the first switch unit and the second switch unit is on, the other switch unit is turned off, so that the voltage output to the load is reduced when the power grid power supply voltage is higher than 220 v.
The two power supply lines comprise a first power supply line and a second power supply line. The power grid power supply, the load, the first power supply line and the second power supply line form a closed loop, namely a power supply loop.
Wherein, referring to fig. 1, the first power supply line may be a live wire, and the second power supply line is a neutral wire. Of course, referring to fig. 2, the first power supply line may also be a neutral line, and the second power supply line may be a live line. In short, one power supply line is a live wire, and the other power supply line is a zero wire.
The application scene of the electric energy management topological structure based on the primary energy conversion is a power supply loop.
Wherein, referring to fig. 3, the electric energy management topology structure based on the primary energy conversion involves five nodes: a first node D1, a second node D2, a third node D3, a fourth node D4, and a fifth node D5. The first node D1 and the third node D3 are positioned on a first power supply line, the first node D1 is connected with a first side of a capacitor C, and the first side of the capacitor C is the side of the capacitor C close to a power grid power supply; the third node D3 is connected to a second side of the capacitor C, where the second side of the capacitor C is a side of the capacitor C close to the load. The second node D2 is located on the second power supply line, the fourth node D4 is located between the first switching unit and the second switching unit, and the fifth node D5 is located between the third switching unit and the fourth switching unit.
The AC-AC module comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor L, wherein the second switch units of the first switch unit are connected in series to form a first bridge arm; the third switching unit and the fourth switching unit are connected in series to form a second bridge arm. One end of the first bridge arm is connected with the first node, and the other end of the first bridge arm is connected with the second node. One end of the second bridge arm is connected with the third node, and the other end of the second bridge arm is connected with the second node. One end of the inductor is connected with the fourth node, and the other end of the inductor is connected with the fifth node.
The pulse controller is respectively connected with the first switch unit, the second switch unit, the third switch unit and the fourth switch unit, so that the on and off of the four switch units can be controlled.
Specifically, when the power supply voltage of the power grid is lower than 220v, the first switch unit is controlled to be kept in an on state, the second switch unit is kept in an off state, and then the third switch unit and the fourth switch unit are controlled periodically. In one cycle, the third switching unit is turned on during the time proportion a, while the fourth switching unit is turned off during the time proportion a; the third switching element is turned off in the time proportion 1-a, while the fourth switching element is turned on in the time proportion 1-a. It can be seen that the third switching unit and the fourth switching unit are alternately switched between on and off states, and that when one of the third switching unit and the fourth switching unit is on, the other switching unit is off, i.e. the states of the two switching units are different.
When the power grid power supply voltage is lower than 220v, in one period, two working modes exist:
Working mode 1: the third switching unit is turned off and the fourth switching unit is turned on, and the whole topological structure has two paths: one is the grid power supply-capacitor C-load, which is an outer loop path. The other is the grid power supply-the first switching unit-the inductance L-the fourth switching unit-the grid power supply. At the moment, the power grid power supply charges and stores energy for the inductor L and supplies power for the load through the capacitor C.
Working mode 2: the third switching unit is turned on and the fourth switching unit is turned off, and the whole topology still has two paths: one is the grid power supply-capacitor C-load, which is an outer loop path. The other is a grid power supply, a first switching unit, an inductance L, a third switching unit and a load; the inductor L then releases energy to power the load and charges the capacitor C.
By adjusting the time proportion of the two working modes in one period, when the voltage of the power grid is lower than 220v, the voltage output to the load is lifted, and various problems caused by the fact that the output voltage of the power grid is lower than 220v are solved.
Specifically, when the power supply voltage of the power grid is higher than 220v, the third switch unit is controlled to keep on state, the fourth switch unit is controlled to keep off state, and then the first switch unit and the second switch unit are controlled periodically. In one cycle, the first switching unit is turned on in a time proportion a, while the second switching unit is turned off in the time proportion a; the first switching unit is turned off in the time proportion 1-a, while the second switching unit is turned on in the time proportion 1-a. It can be seen that the first switching unit and the second switching unit are alternately switched between on and off states, and that when one of the first switching unit and the second switching unit is on, the other switching unit is off, i.e. the states of the two switching units are different.
When the power supply voltage of the power grid is higher than 220v, two working modes exist in one period:
Working mode 3: the first switching unit is turned off and the second switching unit is turned on, and the whole topological structure has two paths: one is the grid power supply-capacitor C-load, which is an outer loop path. The other is the mains power supply-capacitance-third switching unit-inductance-second switching unit. At the moment, the power grid power supply charges and stores energy for the inductor L and supplies power for the load through the capacitor C.
Working mode 4: the first switching unit is on and the second switching unit is off, and the whole topology still has two paths: one is the grid power supply-capacitor C-load, which is an outer loop path. The other is the mains power supply-the first switching unit-the inductance-the third switching unit-the load. The inductor L then releases energy to power the load and charges the capacitor C.
By adjusting the time proportion of the two working modes in one period, when the voltage of the power grid power supply is higher than 220v, the voltage output to the load is reduced, and various problems caused by the fact that the output voltage of the power grid power supply is higher than 220v are solved.
In one embodiment, referring to fig. 6, the topology may further comprise a fifth switching unit disposed between the first node and the third node, the fifth switching unit comprising two thyristors connected in parallel, the fifth switching unit being configured to short-circuit the AC-AC module under control of the pulse controller when the grid supply voltage is normal.
Wherein the directions of the two thyristors are opposite.
Since the first node D1 and the third node D3 are located at both sides of the capacitor C, the fifth switching unit is also connected in parallel with the capacitor C. The fifth switch unit is also connected with the pulse controller, and the pulse controller short-circuits the whole AC-AC module when the voltage of the power grid power supply is normal, so that the power grid power supply only supplies power to the load through the outer ring passage, and normal requirements can be met.
It can be seen that the fifth switch unit is equivalent to a bypass switch, and short-circuits the AC-AC module when the voltage of the power grid is not required to be raised or lowered, so as to avoid unnecessary loss.
In one embodiment, referring to fig. 6, the topology may further comprise a mechanical switch disposed between the first node and the third node for closing when repairing the primary energy conversion based power management topology.
That is, the mechanical switch is connected in parallel with the capacitor C, and when the electric energy management topological structure based on the primary energy conversion needs to be maintained, the mechanical switch can be closed, so that the maintenance of personnel is facilitated.
In one embodiment, the specific structures of the first switch unit, the second switch unit, the third switch unit and the fourth switch unit may take various forms, and the four switch units may take the same form or may take different forms. Referring to fig. 4 and 5, the following illustrates a specific form of four switch units based on the first power supply line being a live line and the second power supply line being a neutral line:
(1.1) the first switching unit comprises a first triode T1, a second triode T2, a first diode D-1 and a second diode D-2; wherein: the emitter of the first triode T1 and the positive electrode of the first diode D-1 are connected to the first node, and the emitter of the second triode T2 and the positive electrode of the second diode D-2 are connected to the fourth node; the collector of the first triode T1, the cathode of the first diode D-1, the collector of the second triode T2 and the cathode of the second diode D-2 are connected, and the base of the first triode T1 and the base of the second triode T2 are connected to the pulse controller;
(2.1) the second switching unit includes a third transistor T3, a fourth transistor T4, a third diode D-3, and a fourth diode D-4; wherein: the emitter of the third triode T3 and the positive electrode of the third diode D-3 are connected to the fourth node, and the emitter of the fourth triode T4 and the positive electrode of the fourth diode D-4 are connected to the second node; the collector of the third triode T3, the negative electrode of the third diode D-3, the collector of the fourth triode T4 and the negative electrode of the fourth diode D-4 are connected, and the base of the third triode T3 and the base of the fourth triode T4 are connected to the pulse controller.
(3.1) The third switching unit includes a fifth transistor T5, a sixth transistor T6, a fifth diode D-5, and a sixth diode D-6; wherein: an emitter of the fifth triode T5 and a positive electrode of the fifth diode D-5 are connected to the third node, and an emitter of the sixth triode T6 and a positive electrode of the sixth diode D-6 are connected to the fifth node; the collector of the fifth triode T5, the negative electrode of the fifth diode D-5, the collector of the sixth triode T6 and the negative electrode of the sixth diode D-6 are connected, and the base of the fifth triode T5 and the base of the sixth triode T6 are connected to the pulse controller;
(4.1) the fourth switching unit includes a seventh transistor T7, an eighth transistor T8, a seventh diode D-7, and an eighth diode D-8; wherein: an emitter of the seventh triode T7 and a positive electrode of the seventh diode D-7 are connected to the fifth node, and an emitter of the eighth triode T8 and a positive electrode of the eighth diode D-8 are connected to the second node; the collector of the seventh triode T7, the negative electrode of the seventh diode D-7, the collector of the eighth triode T8 and the negative electrode of the eighth diode D-8 are connected, and the base of the seventh triode T7 and the base of the eighth triode T8 are connected to the pulse controller.
(1.2) The first switching unit includes: a ninth transistor T9, a ninth diode D-9, a twelfth diode D-10, an eleventh diode D-11, a twelfth diode D-12, and a thirteenth diode D-13, wherein: the cathode of the ninth diode D-9 and the anode of the tenth diode D-10 are connected to the first node, the anode of the ninth diode D-9, the emitter of the ninth triode T9, the anode of the eleventh diode D-11 and the anode of the thirteenth diode D-13 are connected, the cathode of the twelfth diode D-10, the collector of the ninth triode T9, the cathode of the twelfth diode D-12 and the cathode of the thirteenth diode D-13 are connected, the cathode of the eleventh diode D-11 and the anode of the twelfth diode D-12 are connected to the fourth node, and the base of the ninth triode T9 is connected to the pulse controller;
(2.2) the second switching unit includes: thirteenth diode T10, fourteenth diode D-14, fifteenth diode D-15, sixteenth diode D-16, seventeenth diode D-17 and eighteenth diode D-18, wherein: the cathode of the fourteenth diode D-14 and the anode of the fifteenth diode D-15 are connected to the fourth node, the anode of the fourteenth diode D-14, the emitter of the tenth triode T10, the anode of the sixteenth diode D-16 and the anode of the eighteenth diode D-18 are connected, the cathode of the fifteenth diode D-15, the collector of the tenth triode T10, the cathode of the seventeenth diode D-17 and the cathode of the eighteenth diode D-18 are connected, the cathode of the sixteenth diode D-16 and the anode of the seventeenth diode D-17 are connected to the second node, and the base of the tenth triode T10 is connected to the pulse controller.
(3.2) The third switching unit includes: an eleventh transistor T11, a nineteenth diode D-19, a twentieth diode D-20, a twentieth diode D-21, a twenty second diode D-22, and a twenty third diode D-23, wherein: the cathode of the nineteenth diode D-19 and the anode of the twentieth diode D-20 are connected to the third node, the anode of the nineteenth diode D-19, the emitter of the eleventh transistor T11, the anode of the twenty second diode D-21 and the anode of the twenty third diode D-23 are connected, the cathode of the twentieth diode D-20, the collector of the eleventh transistor T11, the cathode of the twenty second diode D-22 and the cathode of the twenty third diode D-23 are connected, the cathode of the twenty second diode D-21 and the anode of the twenty second diode D-22 are connected to a fifth node, and the base of the eleventh transistor T11 is connected to the pulse controller;
(4.2) the fourth switching unit includes: a twelfth transistor T12, a twenty-fourth diode D-24, a twenty-fifth diode D-25, a twenty-sixth diode D-26, a twenty-seventh diode D-27, and a twenty-eighth diode D-28, wherein: the negative electrode of the twenty-fourth diode D-24 and the positive electrode of the twenty-fifth diode D-25 are connected to the fifth node, the positive electrode of the twenty-fourth diode D-24, the emitter of the twelfth transistor T12, the positive electrode of the twenty-sixth diode D-26 and the positive electrode of the twenty-eighth diode D-28 are connected, the negative electrode of the twenty-fifth diode D-25, the collector of the twelfth transistor T12, the negative electrode of the twenty-seventh diode D-27 and the negative electrode of the twenty-eighth diode D-28 are connected, the negative electrode of the twenty-sixth diode D-26 and the positive electrode of the twenty-seventh diode D-27 are connected to the second node, and the base of the twelfth transistor T12 is connected to the pulse controller.
In one embodiment, three power supply loops are included in the three-phase system, and three power grid power supplies in the three power supply loops correspond to three-phase power supplies, and zero lines of the power supply loops are connected.
Referring to fig. 7, three power grid sources in three power supply loops in a three-phase system are Vga, vgb, vgc respectively, three loads are Voa, vob, voc respectively, and zero lines of the three power supply loops are connected together.
In the embodiment of the invention, a capacitor is connected in series in the power supply loop to form a transformer-free structure, so that the cost is reduced compared with a transformer mode in the prior art.
Compared with an AC/DC+DC/AC framework of two-stage energy conversion in the prior art, the AC-AC module of one-stage energy conversion can reduce cost.
In the embodiment of the invention, each switch unit is controlled by the pulse controller, so that the smoothness of alternating current output is ensured, the output of standard alternating current voltage is realized, the waveform quality is improved, and the functions of resonance treatment and the like are simultaneously considered.
Therefore, the electric energy management topological structure based on the primary energy conversion has the advantages of being very simple in structure, easy to control, free of a transformer, capable of saving the number of devices, reducing cost, reducing occupied volume and improving efficiency compared with the prior art by adopting the AC-AC module with the primary energy conversion.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention in further detail, and are not to be construed as limiting the scope of the invention, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the invention.
Claims (10)
1. The electric energy management topological structure based on the primary energy conversion is characterized in that the topological structure is applied to a power supply loop, and the power supply loop is composed of a power grid power supply, a load and two connecting wires for connecting the power grid power supply and the load; the topology includes a pulse controller, a capacitor, and an AC-AC module, wherein:
The capacitor is connected in series in the power supply loop and is arranged on a first connecting line of the two connecting lines;
The AC-AC module comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor; the first switch unit and the second switch unit are connected in series to form a first bridge arm, one end of the first bridge arm is connected with a first node, and the other end of the first bridge arm is connected with a second node; the third switch unit and the fourth switch unit are connected in series to form a second bridge arm, one end of the second bridge arm is connected with a third node, and the other end of the second bridge arm is connected with the second node; the inductor is connected between the fourth node and the fifth node; the first node is a node between the power grid and the capacitor on the first connecting line, the second node is a node between the power grid and the load on a second connecting line of the two connecting lines, the third node is a node between the capacitor and the load on the first connecting line, and the fourth node is a connecting node of the first switch unit and the second switch unit; the fifth node is a connection node between the third switch unit and the fourth switch unit;
The pulse controller is connected to the first switching unit, the second switching unit, the third switching unit and the fourth switching unit; the pulse controller is used for: controlling the first switching unit to remain on and the second switching unit to remain off when the grid power supply voltage is lower than 220v, controlling each of the third switching unit and the fourth switching unit to alternately switch between on and off, and switching off one switching unit when the other switching unit is on so as to raise the voltage output to the load when the grid power supply voltage is lower than 220 v; when the power grid power supply voltage is higher than 220v, the third switch unit is controlled to be kept on and the fourth switch unit is controlled to be kept off, each of the first switch unit and the second switch unit is controlled to be alternately switched on and off, and when one of the first switch unit and the second switch unit is on, the other switch unit is turned off, so that the voltage output to the load is reduced when the power grid power supply voltage is higher than 220 v.
2. The topology of claim 1, further comprising a fifth switching unit disposed between the first node and the third node, the fifth switching unit comprising two thyristors in parallel, the fifth switching unit for shorting the AC-AC module under control of the pulse controller when the grid supply voltage is normal.
3. The topology of claim 2, further comprising a mechanical switch disposed between the first node and the third node, the mechanical switch configured to close when servicing the primary energy conversion based electrical energy management topology.
4. The topology of claim 1, wherein said first connection line is a live line and said second connection line is a neutral line.
5. The topology of claim 1, wherein said first connection line is a neutral line and said second connection line is a hot line.
6. The topology of claim 4, wherein,
The first switch unit comprises a first triode, a second triode, a first diode and a second diode; wherein: the emitter of the first triode and the positive electrode of the first diode are connected to the first node, and the emitter of the second triode and the positive electrode of the second diode are connected to the fourth node; the collector of the first triode, the cathode of the first diode, the collector of the second triode and the cathode of the second diode are connected, and the base of the first triode and the base of the second triode are connected to the pulse controller;
And/or the second switch unit comprises a third triode, a fourth triode, a third diode and a fourth diode; wherein: the emitter of the third triode and the positive electrode of the third diode are connected to the fourth node, and the emitter of the fourth triode and the positive electrode of the fourth diode are connected to the second node; the collector of the third triode, the cathode of the third diode, the collector of the fourth triode and the cathode of the fourth diode are connected, and the base of the third triode and the base of the fourth triode are connected to the pulse controller.
7. The topology of claim 6, wherein,
The third switch unit comprises a fifth triode, a sixth triode, a fifth diode and a sixth diode; wherein: an emitter of the fifth triode and a positive electrode of the fifth diode are connected to the third node, and an emitter of the sixth triode and a positive electrode of the sixth diode are connected to the fifth node; the collector of the fifth triode, the negative electrode of the fifth diode, the collector of the sixth triode and the negative electrode of the sixth diode are connected, and the base of the fifth triode and the base of the sixth triode are connected to the pulse controller;
And/or the fourth switching unit comprises a seventh triode, an eighth triode, a seventh diode and an eighth diode; wherein: an emitter of the seventh triode and a positive electrode of the seventh diode are connected to the fifth node, and an emitter of the eighth triode and a positive electrode of the eighth diode are connected to the second node; the collector of the seventh triode, the negative electrode of the seventh diode, the collector of the eighth triode and the negative electrode of the eighth diode are connected, and the base of the seventh triode and the base of the eighth triode are connected to the pulse controller.
8. The topology of claim 4, wherein,
The first switching unit includes: a ninth triode, a ninth diode, a twelfth diode, an eleventh diode, a twelfth diode, and a thirteenth diode, wherein: the negative electrode of the ninth diode and the positive electrode of the twelfth diode are connected to the first node, the positive electrode of the ninth diode, the emitter of the ninth triode, the positive electrode of the eleventh diode and the positive electrode of the thirteenth diode are connected, the negative electrode of the twelfth diode, the collector of the ninth triode, the negative electrode of the twelfth diode and the negative electrode of the thirteenth diode are connected, the negative electrode of the eleventh diode and the positive electrode of the twelfth diode are connected to the fourth node, and the base of the ninth triode is connected to the pulse controller;
And/or, the second switching unit includes: thirteenth electrode tube, fourteenth diode, fifteenth diode sixteenth diode a seventeenth diode and an eighteenth diode, wherein: the cathode of the fourteenth diode and the anode of the fifteenth diode are connected to the fourth node, the anode of the fourteenth diode, the emitter of the tenth triode, the anode of the sixteenth diode and the anode of the eighteenth diode are connected, the cathode of the fifteenth diode, the collector of the tenth triode, the cathode of the seventeenth diode and the cathode of the eighteenth diode are connected, the cathode of the sixteenth diode and the anode of the seventeenth diode are connected to the second node, and the base of the thirteenth diode is connected to the pulse controller.
9. The topology of claim 4, wherein,
The third switching unit includes: an eleventh transistor, a nineteenth diode, a twentieth diode, a twenty second diode, and a twenty third diode, wherein: a cathode of the nineteenth diode and an anode of the twentieth diode are connected to the third node, the anode of the nineteenth diode, an emitter of the eleventh transistor, an anode of the twenty second diode, and an anode of the twenty third diode are connected, a cathode of the twentieth diode, a collector of the eleventh transistor, a cathode of the twenty second diode, and an anode of the twenty third diode are connected, a cathode of the twenty second diode and an anode of the twenty second diode are connected to a fifth node, and a base of the eleventh transistor is connected to the pulse controller;
and/or, the fourth switching unit comprises: a twelfth transistor, a twenty-fourth diode, a twenty-fifth diode, a twenty-sixth diode, a twenty-seventh diode, and a twenty-eighth diode, wherein: the negative electrode of the twenty-fourth diode and the positive electrode of the twenty-fifth diode are connected to the fifth node, the positive electrode of the twenty-fourth diode, the emitter of the twelfth triode, the positive electrode of the twenty-sixth diode and the positive electrode of the twenty-eighth diode are connected, the negative electrode of the twenty-fifth diode, the collector of the twelfth triode, the negative electrode of the twenty-seventh diode and the negative electrode of the twenty-eighth diode are connected, the negative electrode of the twenty-sixth diode and the positive electrode of the twenty-seventh diode are connected to the second node, and the base of the twelfth triode is connected to the pulse controller.
10. Topology according to claim 4 or 5, characterized in that three of said supply loops are included in a three-phase system, three grid power sources of the three supply loops corresponding to three phase power sources, the zero line connection of each of said supply loops.
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| GB2600492B (en) * | 2020-11-03 | 2023-11-29 | Energy Res Lab Ltd | Power supply apparatus |
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