CN118249353B - Electric energy management topological structure based on primary energy conversion - Google Patents

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

Power management topology based on primary energy conversion

Technical Field

The present invention relates to the technical field of distribution networks, and in particular to an electric energy management topology structure based on primary energy conversion.

Background Art

The power quality of the power supply area of the distribution network will affect the power supply quality. Low-quality power supply will lead to increased power line loss, equipment failure, power outage accidents and other problems, and affect the production and life of users. In some power supply areas, due to the seasonal and intermittent fluctuations of the load, the transformer outlet voltage is in a low voltage state, and the impact load exacerbates the voltage fluctuation; when there is a large load at the end of the line, it will also cause the problem of low terminal power supply voltage. Especially in mountainous and remote areas, some areas have a long power supply radius, poor power quality at the end of the power supply, and low power supply reliability. Some new energy access occasions are prone to high voltage, so that the power supply voltage is often too high or too low than the standard voltage (220V); too high or too low voltage will cause the user's electrical equipment to fail to work normally, which has a great impact on the regional economy and social stability. In view of the situation where the power supply voltage of the power grid is too high or too low, it is necessary to take certain measures to improve it.

Summary of the invention

In order to solve the above technical problems or at least partially solve the above technical problems, the present invention provides an electric energy management topology based on primary energy conversion.

The electric energy management topology structure based on primary energy conversion provided in an embodiment of the present invention is applied in a power supply circuit, wherein the power supply circuit is composed of a power grid, a load, and two connecting lines connecting the power grid and the load; the topology structure includes a pulse controller, a capacitor, and an AC-AC module, wherein:

The capacitor is arranged on the 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 to the first node, and the other end of the first bridge arm is connected to the 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 to the third node, and the other end of the second bridge arm is connected to the second node; the inductor is connected between the fourth node and the fifth node; wherein the first node is a node between the grid power supply and the capacitor on the first connecting line, the second node is a node between the grid power supply and the load on the 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 connection node between 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 switch unit, the second switch unit, the third switch unit and the fourth switch unit; the pulse controller is used to: when the grid power supply voltage is lower than 220V, control the first switch unit to remain turned on and the second switch unit to remain turned off, control each of the third switch unit and the fourth switch unit to switch alternately between on and off, and when one of the third switch unit and the fourth switch unit is turned on, the other switch unit is turned off, so that when the grid power supply voltage is lower than 220V, the voltage output to the load is increased; when the grid power supply voltage is higher than 220V, control the third switch unit to remain turned on and the fourth switch unit to remain turned off, control each of the first switch unit and the second switch unit to switch alternately between on and off, and when one of the first switch unit and the second switch unit is turned on, the other switch unit is turned off, so that when the grid power supply voltage is higher than 220V, the voltage output to the load is reduced.

In the power management topology structure based on primary energy conversion provided by the embodiment of the present invention, when the voltage of the power grid is lower than 220V, the pulse controller controls the first switch unit to remain on and the second switch unit to remain off, controls each of the third switch unit and the fourth switch unit to switch alternately between on and off, and when one of the third switch unit and the fourth switch unit is on, the other switch unit is off, so that when the voltage of the power grid is lower than 220V, the voltage output to the load is raised; when the voltage of the power grid is higher than 220V, the third switch unit is controlled to remain on and the fourth switch unit is controlled to remain off, controls each of the first switch unit and the second switch unit to switch alternately between on and off, and when one of the first switch unit and the second switch unit is on, the other switch unit is off, so that when the voltage of the power grid is higher than 220V, the voltage output to the load is reduced. Thereby, various problems caused by the output voltage of the power grid to the load being lower than 220V or higher than 220V are improved. Moreover, in the embodiment of the present invention, by connecting a capacitor in series in the power supply circuit to replace the transformer structure in the prior art, the cost can be reduced and the efficiency can be improved. The embodiment of the present invention adopts an AC-AC module of primary energy conversion to replace the AC/DC+DC/AC architecture of secondary energy conversion in the prior art, which can save costs. In short, the topological structure provided by the embodiment of the present invention has the advantages of reducing costs and improving efficiency when increasing or decreasing voltage.

BRIEF DESCRIPTION OF THE 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 present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

FIG1 is a schematic diagram of the layout of a power management topology structure based on primary energy conversion in a power supply circuit according to an embodiment of the present invention;

FIG2 is a schematic diagram of the layout of an electric energy management topology structure based on primary energy conversion in a power supply circuit in another embodiment of the present invention;

FIG3 is a structural block diagram of a power management topology structure based on primary energy conversion in a power supply circuit in one embodiment of the present invention;

FIG4 is a schematic diagram of a specific topological structure of FIG3 ;

FIG5 is a schematic diagram of another specific topological structure of FIG3 ;

FIG6 is a schematic diagram of the layout of an electric energy management topology structure based on primary energy conversion in a power supply circuit in another embodiment of the present invention;

FIG7 is an overall schematic diagram of an electric energy management topology structure based on primary energy conversion applied in a three-phase system in one embodiment of the present invention.

Figure markings: D1-first node; D2-second node; D3-third node; D4-fourth node; D5-fifth node; D-1~D-28-diodes; T1~T12-transistors; L-inductor; C-capacitor; Vga-grid power supply in the first power supply circuit in the three-phase system; Vgb-grid power supply in the second power supply circuit in the three-phase system; Vgc-grid power supply in the third power supply circuit in the three-phase system; Voa-load in the first power supply circuit in the three-phase system; Vob-load in the second power supply circuit in the three-phase system; Voc-load in the third power supply circuit in the three-phase system.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

The embodiment of the present invention provides a power management topology based on primary energy conversion. Referring to Figures 1 to 3, the topology is applied in a power supply circuit, which is composed of a power grid power supply, a load, and two connecting lines 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 the 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 to the first node, and the other end of the first bridge arm is connected to the 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 to the third node, and the other end of the second bridge arm is connected to the second node; the inductor is connected between the fourth node and the fifth node; wherein the first node is a node between the grid power supply and the capacitor on the first connecting line, the second node is a node between the grid power supply and the load on the 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 connection node between 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 switch unit, the second switch unit, the third switch unit and the fourth switch unit; the pulse controller is used to: when the grid power supply voltage is lower than 220V, control the first switch unit to remain turned on and the second switch unit to remain turned off, control each of the third switch unit and the fourth switch unit to switch alternately between on and off, and when one of the third switch unit and the fourth switch unit is turned on, the other switch unit is turned off, so that when the grid power supply voltage is lower than 220V, the voltage output to the load is increased; when the grid power supply voltage is higher than 220V, control the third switch unit to remain turned on and the fourth switch unit to remain turned off, control each of the first switch unit and the second switch unit to switch alternately between on and off, and when one of the first switch unit and the second switch unit is turned on, the other switch unit is turned off, so that when the grid power supply voltage is higher than 220V, the voltage output to the load is reduced.

The two power supply lines include a first power supply line and a second power supply line. The 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 can be a live line, and the second power supply line can be a neutral line. Of course, referring to Fig. 2, the first power supply line can also be a neutral line, and the second power supply line can be a live line. In short, one power supply line is a live line, and the other power supply line is a neutral line.

Among them, the application scenario of the power management topology structure based on primary energy conversion is the power supply circuit.

Among them, referring to FIG3, the electric energy management topology structure based on the primary energy conversion involves five nodes: the first node D1, the second node D2, the third node D3, the fourth node D4, and the fifth node D5. The first node D1 and the third node D3 are located on the first power supply line, the first node D1 is connected to the first side of the capacitor C, and the first side of the capacitor C is the side of the capacitor C close to the power grid; the third node D3 is connected to the second side of the capacitor C, and the second side of the capacitor C is the 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 switch unit and the second switch unit, and the fifth node D5 is located between the third switch unit and the fourth switch unit.

The AC-AC module includes a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and an inductor L. The second switch unit of the first switch unit is connected in series to form a first bridge arm; the third switch unit and the fourth switch unit are connected in series to form a second bridge arm. One end of the first bridge arm is connected to the first node, and the other end is connected to the second node. One end of the second bridge arm is connected to the third node, and the other end is connected to the second node. One end of the inductor is connected to the fourth node, and the other end is connected to the fifth node.

The pulse controller is connected to the first switch unit, the second switch unit, the third switch unit and the fourth switch unit respectively, so that the on and off of the four switch units can be controlled.

Specifically, when the grid power supply voltage is lower than 220V, the first switch unit is controlled to remain in the on state, the second switch unit is kept in the off state, and then the third switch unit and the fourth switch unit are periodically controlled. In one cycle, the third switch unit is on within the time ratio a, and at the same time, the fourth switch unit is off within the time ratio a; the third switch unit is off within the time ratio 1-a, and at the same time, the fourth switch unit is on within the time ratio 1-a. It can be seen that the third switch unit and the fourth switch unit will switch alternately between the on and off states, and when one of the third and fourth switch units is on, the other switch unit is off, that is, the states of the two switch units are different.

When the grid power supply voltage is lower than 220V, there are two working modes in one cycle:

Working mode 1: The third switch unit is turned off and the fourth switch unit is turned on. The entire topology 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-first switch unit-inductor L-fourth switch unit-grid power supply. At this time, the grid power supply charges the inductor L and supplies power to the load through the capacitor C.

Working mode 2: The third switch unit is turned on and the fourth switch unit is turned off. The entire topology still 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-first switch unit-inductor L-third switch unit-load; at this time, the inductor L releases energy to supply power to the load and charges the capacitor C.

By adjusting the time ratio of the two working modes within a cycle, when the grid power supply voltage is lower than 220V, the voltage output to the load can be raised, thereby improving various problems caused by the grid power supply output voltage to the load being lower than 220V.

Specifically, when the grid power supply voltage is higher than 220V, the third switch unit is controlled to remain in the on state, the fourth switch unit is kept in the off state, and then the first switch unit and the second switch unit are periodically controlled. In one cycle, the first switch unit is on within the time ratio a, and at the same time, the second switch unit is off within the time ratio a; the first switch unit is off within the time ratio 1-a, and at the same time, the second switch unit is on within the time ratio 1-a. It can be seen that the first switch unit and the second switch unit will switch alternately between the on and off states, and when one of the first switch unit and the second switch unit is on, the other switch unit is off, that is, the states of the two switch units are different.

When the grid power supply voltage is higher than 220V, there are two working modes in one cycle:

Working mode 3: The first switch unit is turned off and the second switch unit is turned on. There are two paths in the entire topology: one is the grid power supply-capacitor C-load, which is an outer loop path. The other is the grid power supply-capacitor-third switch unit-inductor-second switch unit. At this time, the grid power supply charges the inductor L and supplies power to the load through the capacitor C.

Working mode 4: The first switch unit is turned on and the second switch unit is turned off. The entire topology still 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-first switch unit-inductor-third switch unit-load. At this time, the inductor L releases energy to supply power to the load and charges the capacitor C.

By adjusting the time ratio of the two working modes within a cycle, when the grid power supply voltage is higher than 220V, the voltage output to the load can be reduced, thereby improving various problems caused by the grid power supply output voltage to the load being higher than 220V.

In one embodiment, referring to FIG. 6 , the topological structure may further include a fifth switch unit disposed between the first node and the third node, the fifth switch unit including two thyristors connected in parallel, and the fifth switch unit being configured to short-circuit the AC-AC module under the control of the pulse controller when the grid power supply voltage is normal.

Among them, the directions of the two thyristors are opposite.

Since the first node D1 and the third node D3 are located on both sides of the capacitor C, the fifth switch unit is also connected in parallel with the capacitor C. The fifth switch unit is also connected to the pulse controller, and the pulse controller short-circuits the entire AC-AC module when the voltage of the grid power supply is normal, so that the grid power supply only supplies power to the load through the outer loop path, which can meet normal needs.

It can be seen that the fifth switch unit is equivalent to a bypass switch. When there is no need to raise or lower the voltage of the grid power supply, the AC-AC module is short-circuited to avoid unnecessary losses.

In one embodiment, referring to FIG. 6 , the topological structure may further include a mechanical switch disposed between the first node and the third node, wherein the mechanical switch is configured to be closed when the power management topological structure based on primary energy conversion is maintained.

That is to say, the mechanical switch and capacitor C are connected in parallel. When the power management topology based on the primary energy conversion needs to be repaired, the mechanical switch can be closed to facilitate maintenance.

In one embodiment, the specific structures of the first switch unit, the second switch unit, the third switch unit, and the fourth switch unit can adopt multiple forms, and the four switch units can adopt the same form or different forms. Referring to FIG. 4 and FIG. 5 , the specific forms of the four switch units are illustrated below based on the first power supply line being the live line and the second power supply line being the neutral line:

(1.1) The first switch unit includes a first transistor T1, a second transistor T2, a first diode D-1, and a second diode D-2; wherein: the emitter of the first transistor T1 and the anode of the first diode D-1 are connected to the first node, the emitter of the second transistor T2 and the anode of the second diode D-2 are connected to the fourth node; the collector of the first transistor T1, the cathode of the first diode D-1, the collector of the second transistor T2 and the cathode of the second diode D-2 are connected, and the base of the first transistor T1 and the base of the second transistor T2 are connected to the pulse controller;

(2.1) The second switch 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 transistor T3 and the anode of the third diode D-3 are connected to the fourth node, the emitter of the fourth transistor T4 and the anode of the fourth diode D-4 are connected to the second node; the collector of the third transistor T3, the cathode of the third diode D-3, the collector of the fourth transistor T4 and the cathode of the fourth diode D-4 are connected, and the base of the third transistor T3 and the base of the fourth transistor T4 are connected to the pulse controller.

(3.1) The third switch unit includes a fifth transistor T5, a sixth transistor T6, a fifth diode D-5, and a sixth diode D-6; wherein: the emitter of the fifth transistor T5 and the anode of the fifth diode D-5 are connected to the third node, the emitter of the sixth transistor T6 and the anode of the sixth diode D-6 are connected to the fifth node; the collector of the fifth transistor T5, the cathode of the fifth diode D-5, the collector of the sixth transistor T6 and the cathode of the sixth diode D-6 are connected, and the base of the fifth transistor T5 and the base of the sixth transistor T6 are connected to the pulse controller;

(4.1) The fourth switch unit includes a seventh transistor T7, an eighth transistor T8, a seventh diode D-7, and an eighth diode D-8; wherein: the emitter of the seventh transistor T7 and the anode of the seventh diode D-7 are connected to the fifth node, the emitter of the eighth transistor T8 and the anode of the eighth diode D-8 are connected to the second node; the collector of the seventh transistor T7, the cathode of the seventh diode D-7, the collector of the eighth transistor T8 and the cathode of the eighth diode D-8 are connected, and the base of the seventh transistor T7 and the base of the eighth transistor T8 are connected to the pulse controller.

(1.2) The first switch unit includes: a ninth transistor T9, a ninth diode D-9, a tenth 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 transistor T9, the anode of the eleventh diode D-11 and the anode of the thirteenth diode D-13 are connected, the cathode of the tenth diode D-10, the collector of the ninth transistor 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 transistor T9 is connected to the pulse controller;

(2.2) The second switch unit includes: a triode T10, a fourteenth diode D-14, a fifteenth diode D-15, a sixteenth diode D-16, a seventeenth diode D-17 and an 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 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 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 triode T10 is connected to the pulse controller.

(3.2) The third switch unit includes: an eleventh transistor T11, a nineteenth diode D-19, a twentieth diode D-20, a twenty-first 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-first 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-first diode D-21 and the anode of the twenty-second diode D-22 are connected to the fifth node, and the base of the eleventh transistor T11 is connected to the pulse controller;

(4.2) The fourth switch 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 cathode of the twenty-fourth diode D-24 and the anode of the twenty-fifth diode D-25 are connected to the fifth node, the anode of the twenty-fourth diode D-24, the emitter of the twelfth transistor T12, the anode of the twenty-sixth diode D-26 and the anode of the twenty-eighth diode D-28 are connected, the cathode of the twenty-fifth diode D-25, the collector of the twelfth transistor T12, the cathode of the twenty-seventh diode D-27 and the cathode of the twenty-eighth diode D-28 are connected, the cathode of the twenty-sixth diode D-26 and the anode 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, the three-phase system includes three power supply circuits, the three grid power supplies in the three power supply circuits correspond to three-phase power supplies, and the neutral lines of the respective power supply circuits are connected.

Referring to FIG. 7 , the three grid power supplies in the three power supply circuits in the three-phase system are Vga, Vgb, and Vgc, respectively, the three loads are Voa, Vob, and Voc, respectively, and the neutral lines of the three power supply circuits are connected together.

In the embodiment of the present invention, a capacitor is connected in series in the power supply loop to form a transformer-free structure, which reduces the cost compared with the transformer method in the prior art.

Among them, the AC-AC module of the first-stage energy conversion in the embodiment of the present invention can reduce the cost compared with the AC/DC+DC/AC architecture of the second-stage energy conversion in the prior art.

Among them, in the embodiment of the present invention, each switch unit is controlled by a pulse controller, which ensures the smoothness of the AC output, realizes the output of standard AC voltage, improves the waveform quality, and takes into account the functions of resonance control.

It can be seen that the electric energy management topology structure based on primary energy conversion provided by the embodiment of the present invention is very simple and easy to control, and does not require a transformer. It also adopts an AC-AC module with primary energy conversion, which saves the number of devices, reduces costs, reduces the occupied volume, and improves efficiency compared to the prior art.

The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solution of the present invention should be included in the scope of protection of the present 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.