CN220359041U - Auxiliary power supply system - Google Patents

Auxiliary power supply system Download PDF

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Publication number
CN220359041U
CN220359041U CN202321985660.0U CN202321985660U CN220359041U CN 220359041 U CN220359041 U CN 220359041U CN 202321985660 U CN202321985660 U CN 202321985660U CN 220359041 U CN220359041 U CN 220359041U
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module
switch module
power supply
boost
diode
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周阳
曾伟
金海燕
卢盈
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Elsevier Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The utility model discloses an auxiliary power supply system which is arranged in a converter and comprises a power taking module and a power supply module which are connected in series, wherein the power taking module is respectively connected with a power grid, a photovoltaic cell panel and a battery in the converter, the power supply module comprises a first power supply module, a second power supply module and a third power supply module which are connected in parallel, the first power supply module comprises a first diode, the second power supply module comprises a second diode, and the third power supply module comprises a third diode; the power taking module comprises a battery auxiliary source module, an AC auxiliary source module and a bus capacitor module, wherein a boosting module is connected between the photovoltaic cell panel and the battery in series, a bidirectional isolation module is connected between the battery and the bus capacitor module in series, and an inversion module is connected between the bus capacitor module and the power grid in series. The auxiliary power supply system can realize energy transmission among the power grid alternating-current side, the photovoltaic battery assembly direct-current side and the battery, and improves the reliability of the auxiliary power supply system.

Description

Auxiliary power supply system
Technical Field
The utility model belongs to the field of converters, and particularly relates to an auxiliary power supply system.
Background
The converter, such as an optical storage integrated machine, a photovoltaic inverter, an energy storage inverter or mobile energy storage equipment, is usually internally provided with an auxiliary power supply system, and the reliability of power supply of the auxiliary power supply system is crucial for the stable operation of the converter, and is also one of important components of the converter. Because the converter has a plurality of working modes such as grid connection, grid disconnection, battery charge and discharge and the like, the existing auxiliary power supply system can take electricity from the alternating current side of a power grid and the direct current side of a photovoltaic battery assembly at the same time or switch alternating current or direct current power supply according to different working states. However, existing auxiliary power systems do not enable the transfer of energy between the ac side of the grid and the dc side of the photovoltaic cell assembly. If the power grid alternating current side and the photovoltaic battery assembly direct current side are powered down simultaneously, the auxiliary power supply system can be powered down or output voltage fluctuates, and reliability of the auxiliary power supply system is low. And a part of auxiliary power supply systems are required to be provided with complex switching circuits, so that the cost is high.
Disclosure of Invention
In view of the above technical problems, the present utility model provides an improved auxiliary power supply system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the auxiliary power supply system is arranged in the converter and comprises a power taking module and a power supply module which are connected in series, wherein the power taking module is respectively connected with a power grid, a photovoltaic cell panel and a battery in the converter; the power supply module comprises a first power supply module, a second power supply module and a third power supply module which are connected in parallel, wherein the first power supply module comprises a first diode, the second power supply module comprises a second diode, and the third power supply module comprises a third diode;
the electricity taking module comprises:
the input end of the battery auxiliary source module is connected with the battery, and the output end of the battery auxiliary source module is connected with the first diode;
the input end of the AC auxiliary source module is connected with the power grid, and the output end of the AC auxiliary source module is connected with the second diode;
the output end of the bus capacitor module is connected with the third diode;
the photovoltaic cell panel is connected with the battery in series with a boosting module, the battery is connected with the bus capacitor module in series with a bidirectional isolation module, and the bus capacitor module is connected with the power grid in series with an inversion module;
the power supply module further comprises a DC auxiliary source module, wherein the input end of the DC auxiliary source module is respectively connected with the first diode, the second diode and the third diode, and the output end of the DC auxiliary source module is connected with a device to be powered of the converter.
Preferably, the bidirectional isolation module includes a DAB circuit, the DAB circuit including:
the primary full bridge comprises at least two bridge arms connected in parallel, and each bridge arm comprises at least two switch modules connected in series;
the secondary full bridge comprises at least two parallel bridge arms, wherein each bridge arm comprises at least two switch modules connected in series;
the isolation transformer is respectively connected with the primary full bridge and the secondary full bridge;
DAB inductance, it is with primary side full bridge and isolation transformer connection respectively.
Further, the primary full bridge comprises a first bridge arm, a second bridge arm and a first bus capacitor which are connected in parallel, wherein the first bridge arm comprises a first switch module and a second switch module which are connected in series, and the second bridge arm comprises a third switch module and a fourth switch module which are connected in series;
the secondary full bridge comprises a third bridge arm, a fourth bridge arm and a second bus capacitor which are connected in parallel, wherein the third bridge arm comprises a fifth switch module and a sixth switch module which are connected in series, and the fourth bridge arm comprises a seventh switch module and an eighth switch module which are connected in series;
an isolation transformer connected with the primary full bridge and the secondary full bridge respectively, wherein the isolation transformer comprises an isolation primary side and an isolation secondary side, one end of the isolation primary side is connected to a connection point of the third switch module and the fourth switch module, one end of the isolation secondary side is connected to a connection point of the fifth switch module and the sixth switch module, and the other end of the isolation secondary side is connected to a connection point of the seventh switch module and the eighth switch module; the first switch module, the second switch module, the third switch module, the fourth switch module, the fifth switch module, the sixth switch module, the seventh switch module and the eighth switch module comprise diodes and power switches which are mutually connected in parallel, and the power switches are insulated gate bipolar transistors or MOS transistors;
and one end of the DAB inductor is connected to the connection point of the first switch module and the second switch module, and the other end of the DAB inductor is connected to the other end of the isolation primary side.
Preferably, the inverter module comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises a ninth switch module and a tenth switch module which are connected in series, and the second inverter bridge arm comprises an eleventh switch module and a twelfth switch module which are connected in series; the ninth switch module, the tenth switch module, the eleventh switch module and the twelfth switch module comprise diodes and power switches which are mutually connected in parallel, and the power switches are insulated gate bipolar transistors or MOS transistors.
Further, the power taking module further comprises a filtering module, and the filtering module is connected in series between the inversion module and the power grid;
the filtering module comprises a filtering inductor and a filtering capacitor, one end of the filtering inductor is connected to a connection point of the ninth switching module and the tenth switching module, and the other end of the filtering inductor is connected to the power grid; one end of the filter capacitor is connected to a connection point of the filter inductor and the power grid, and the other end of the filter capacitor is connected to a connection point of the eleventh switch module and the twelfth switch module.
Furthermore, at least one grid-connected relay is connected in series between the filtering module and the power grid.
Preferably, the DC auxiliary source module includes a step-down circuit.
Preferably, the Boost module comprises a Boost circuit, and the Boost circuit comprises a Boost input capacitor, a Boost switch module, a Boost output capacitor, a Boost inductor and a Boost diode;
one end of the Boost input capacitor is connected to a connection point of the photovoltaic cell panel and the Boost inductor, and the other end of the Boost input capacitor is connected to a connection point between the photovoltaic cell panel and the battery;
one end of the Boost switch module is connected to a connection point between the Boost inductor and the Boost diode, and the other end of the Boost switch module is connected to a connection point between the photovoltaic panel and the battery;
one end of the Boost output capacitor is connected to a connection point between the Boost diode and the battery, and the other end of the Boost output capacitor is connected to a connection point between the photovoltaic panel and the battery;
one end of the Boost inductor is connected to the photovoltaic cell panel, and the other end of the Boost inductor is connected to the Boost diode;
one end of the Boost diode is connected to the Boost inductor, and the other end of the Boost diode is connected to the battery.
Further, the Boost switch module comprises a diode and a power switch which are connected in parallel, wherein the power switch is an insulated gate bipolar transistor or a MOS tube; the Boost diode is a schottky diode.
Preferably, the converter is an optical storage integrated machine, a photovoltaic inverter, an energy storage inverter or mobile energy storage equipment; the device to be powered comprises a control system of the converter, a driving transformer, a relay, a monitoring board or a WIFI stick.
Compared with the prior art, the utility model has the following advantages:
in the auxiliary power supply system, as the bidirectional isolation module is connected in series between the battery and the bus capacitor module, the energy of the power grid can be transmitted to the battery for charging through the bidirectional isolation module after the topological rectification of the inverter module at the alternating current side of the power grid; the boost module is arranged between the photovoltaic cell panel and the battery, and the battery can be discharged after the boost module and the inversion module pass through, so that the energy of the photovoltaic cell panel can be transmitted to the built-in battery of the converter and the rear-stage alternating current power grid. The auxiliary power supply system can simultaneously take power from the power grid, the photovoltaic cell panel and the battery in the converter, the highest voltage value in the power grid, the photovoltaic cell panel and the converter is used as the input of the DC auxiliary source module in a competition power supply mode through the parallel diode, the DC auxiliary source module outputs voltage to the device to be powered, when the power grid voltage at the photovoltaic cell panel side and the battery side or the alternating current side is powered down due to a certain reason, the auxiliary power supply system cannot be powered down or output voltage fluctuation, and the reliability of the auxiliary power supply system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the connection of an auxiliary power supply system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another connection of the auxiliary power supply system according to an embodiment of the present utility model;
11, a photovoltaic cell panel; 12. a battery; 13. a power grid; 2. a power taking module; 21. a battery auxiliary source module; 22. an AC auxiliary source module; 23. a bus capacitor module; 24. a boost module; 25. a bidirectional isolation module; 251. primary full bridge; 252. a secondary full bridge; 253. an isolation transformer; l (L) 1 DAB inductance; c (C) 1 A first bus capacitor; c (C) 2 A second bus capacitor; t (T) 1 A first switch module; t (T) 2 A second switch module; t (T) 3 A third switch module; t (T) 4 A fourth switch module; t (T) 5 A fifth switch module; t (T) 6 A sixth switch module; t (T) 7 A seventh switch module; t (T) 8 An eighth switch module; t (T) 9 A ninth switch module; t (T) 10 A tenth switch module; t (T) 11 An eleventh switch module; t (T) 12 A twelfth switching module; 26. an inversion module; 27. a filtering module; l (L) 2 A filter inductance; c (C) 3 A filter capacitor; 28. grid-connected relay; c (C) 4 Boost input capacitance; c (C) 5 Boost output capacitance; t (T) 13 A Boost switch module; l (L) 3 Boost inductance; d (D) 1 Boost diode; 3. a power supply module; 31. a DC auxiliary source module; 4.a first power supply module; 41. a first diode; 5. a second power supply module; 51. a second diode; 6. a third power supply module; 61. a third diode; 7. and a device to be powered.
Detailed Description
Preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 and fig. 2, the embodiment discloses an auxiliary power supply system, which is disposed inside a converter, and the converter may be an optical storage integrated machine, a photovoltaic inverter, an energy storage inverter or a mobile energy storage device, which is not limited herein. The auxiliary power supply system comprises a power taking module 2 and a power supply module 3 which are connected in series. The power taking module 2 is respectively connected with the power grid 13, the photovoltaic cell panel 11 and the battery 12 in the converter, namely the system can simultaneously take power from the power grid alternating current side, the photovoltaic cell panel direct current side and the built-in battery of the converter. The power supply module 3 comprises a first power supply module 4, a second power supply module 5 and a third power supply module 6 in parallel, the first power supply module 4 comprising a first diode 41, the second power supply module 5 comprising a second diode 51, the third power supply module 6 comprising a third diode 61. The power supply module 3 further comprises a DC auxiliary source module 31, the input end of the DC auxiliary source module 31 is respectively connected with the first diode 41, the second diode 51 and the third diode 61, and the output end of the DC auxiliary source module 31 is connected with the to-be-supplied device 7 of the converter.
As shown in fig. 1, the power taking module 2 includes a battery auxiliary source module 21, an AC auxiliary source module 22, and a bus capacitor module 23. The input terminal of the battery assist source module 21 is connected to the battery 12, and the output terminal of the battery assist source module 21 is connected to the first diode 41. The input of the AC auxiliary source module 22 is connected to the grid 13 and the output of the AC auxiliary source module 22 is connected to the second diode 51. The output terminal of the bus capacitor module 23 is connected to the third diode 61. The voltage highest value seat in the battery auxiliary source module 21, the AC auxiliary source module 22 and the bus capacitor module 23 is used as the input of the DC auxiliary source module 31 in a parallel diode competition power supply mode, so that when the power grid side, the battery test or the direct current side of the photovoltaic module fails, the auxiliary power supply system does not fail or output voltage fluctuates, and the reliability of the auxiliary power supply system is improved. In this embodiment, the rated output voltage of the bus capacitor module 23 is greater than the rated output voltage of the AC auxiliary source module 22, and the rated output voltage of the AC auxiliary source module 22 is greater than the rated output voltage of the battery auxiliary source module 21. For example, the rated output voltage of the bus capacitor module 23 may be 330V to 460V, the rated output voltage of the ac auxiliary source module 22 may be 110V, and the rated output voltage of the battery auxiliary source module 21 may be 100V. Under normal working conditions, the DC auxiliary source module 31 directly takes electricity from the bus capacitor module 23, the other two paths of battery auxiliary source modules 21 and the AC auxiliary source module 22 run in no-load (i.e. no output current), and compared with a two-stage running scheme, the auxiliary source single-stage running scheme improves the system efficiency. Since the rated output voltage of the AC auxiliary source module 22 is set to 110V and the rated output voltage of the battery auxiliary source module 21 is set to 100V, a lower output voltage contributes to a reduction in the number of winding turns and the size of the magnetic core, thereby reducing the cost and enabling optimization of the size.
The power taking module 2 further comprises a boosting module 24, a bidirectional isolation module 25, an inversion module 26 and a filtering module 27. Specifically, the voltage boosting module 24 is connected in series between the photovoltaic panel 11 and the battery 12. The bidirectional isolation module 25 is connected in series between the battery 12 and the bus capacitor module 23, the inverter module 26 is connected in series between the bus capacitor module 23 and the power grid 13, and the filter module 27 is connected in series between the inverter module 26 and the power grid 13.
The bi-directional isolation module 25 specifically includes a dual active bridge (Dual Active Bridge, DAB) circuit including a primary full bridge 251, a secondary full bridge 252, an isolation transformer 253, and a DAB inductor L 1 . Isolation transformer 253 is respectively connected with primary full bridge 251 and secondary full bridgeThe bridge 252 is connected. DAB inductor L 1 Is connected to the primary full bridge 251 and the isolation transformer 253, respectively. Specifically, the primary full bridge 251 includes a first bridge arm, a second bridge arm, and a first bus capacitor C connected in parallel 1 . The first bridge arm comprises a first switch module T connected in series 1 And a second switch module T 2 The second bridge arm comprises a third switch module T connected in series 3 And a fourth switch module T 4 . The secondary full bridge 252 includes a third bridge arm, a fourth bridge arm and a second bus capacitor C connected in parallel 2 . The third bridge arm comprises a fifth switch module T connected in series 5 And a sixth switch module T 6 The fourth bridge arm comprises a seventh switch module T connected in series 7 And an eighth switch module T 8 . The isolation transformer 253 is connected to the primary full bridge 251 and the secondary full bridge 252, respectively. The isolating transformer comprises an isolating primary side and an isolating secondary side, wherein one end of the isolating primary side is connected to the third switch module T 3 And a fourth switch module T 4 One end of the isolation secondary side is connected to the fifth switch module T 5 And a sixth switch module T 6 The other end of the isolation secondary side is connected to the seventh switch module T 7 And an eighth switch module T 8 Is connected to the connecting point of (c). Wherein, the first switch module T 1 A second switch module T 2 Third switch module T 3 Fourth switch module T 4 A fifth switch module T5, a sixth switch module T6 and a seventh switch module T 7 And an eighth switch module T 8 The power switch is an insulated gate bipolar transistor or a MOS tube. DAB inductor L 1 Is connected to the first switch module T 1 And a second switch module T 2 DAB inductance L 1 And the other end of the isolation primary is connected to the other end of the isolation primary.
The inverter module 26 includes a first inverter leg and a second inverter leg connected in parallel. The first inverter bridge arm comprises a ninth switch module T connected in series 9 And a tenth switch module T 10 The second inverter bridge arm comprises an eleventh switch module T connected in series 11 And a twelfth switch module T 12 . Wherein, the ninth switch module T 9 Tenth stepSwitch module T 10 Eleventh switch module T 11 And a twelfth switch module T 12 The power switch is an insulated gate bipolar transistor or a MOS tube.
The filter module 27 includes a filter inductance L 2 And filter capacitor C 3 . Filter inductance L 2 Is connected to the ninth switching module T 9 And a tenth switch module T 10 Is connected with the filter inductance L 2 Is connected to the grid 13 at the other end. Filter capacitor C 3 Is connected to the filter inductance L 2 Connection point with the electric network 13, filter capacitor C 3 Is connected to the eleventh switch module T 11 And a twelfth switch module T 12 Is connected to the connecting point of (c).
The Boost module 24 includes a Boost circuit including a Boost input capacitance C 4 Boost switch module T 13 Boost output capacitor C 5 Boost inductor L 3 And Boost diode D 1 . Boost input capacitance C 4 Is connected to the photovoltaic panel 11 and Boost inductance L 3 Boost input capacitance C 4 Is connected to the connection point between the photovoltaic panel 11 and the cells 12.Boost switch module T 13 Is connected to Boost inductance L 3 And Boost diode D 1 Connection point between the two, boost switch module T 13 Is connected to the connection point between the photovoltaic panel 11 and the cells 12.Boost output capacitor C 5 Is connected to Boost diode D 1 And the junction between the battery 12, boost output capacitance C 5 Is connected to the connection point between the photovoltaic panel 11 and the cells 12.Boost inductor L 3 Is connected to the photovoltaic panel 11, boost inductance L 3 Is connected to Boost diode D 1 . Boost diode D 1 Is connected to Boost inductance L 3 Boost diode D 1 And the other end of (c) is connected to the battery 12.Boost switch module T 13 The power switch is an insulated gate bipolar transistor or a MOS tube. Boost diode D 1 In a BOOST circuit, the schottky diode mainly plays an isolating role. Meanwhile, when the photovoltaic cell panel 11 is powered on, the voltage of the photovoltaic cell panel 11 can be transmitted to the input end of the battery auxiliary source module 21 through the Boost diode D1, and when the voltage meets the rated input voltage range of the battery auxiliary source module 21, the battery auxiliary source module 21 and the DC auxiliary source module 31 can still work normally even if the battery 12 and the power grid 13 are not powered on at the moment.
The Boost circuit mainly transmits the energy of the photovoltaic cell panel 11 to a battery in the converter and a rear-stage alternating current power grid. The DAB circuit is of a bidirectional topology, the energy of the power grid can be transmitted to the battery for charging through the DAB circuit after the topology rectification of the inverter circuit, and the energy can be transmitted to the alternating current power grid after the DAB circuit and the inverter circuit discharge the battery. Because the power supply of the auxiliary source is not big, so all adopt flyback scheme, the common-mode voltage of high frequency jump is through flyback transformer's isolation, lacks the interference backward flow route, can effectively reduce conduction and the radiation interference level of system, under the condition that components and parts are few, the power is little, the cost is lower relatively. The input end of the battery auxiliary source module 21 is connected with BATV+ and BATV-, the rated input voltage range is 30V-60V, and the rated output voltage is 100V. The input end of the AC auxiliary source module 22 is connected with ACL and ACN, the rated input voltage range is 154V-276V, and the rated output voltage is 110V. The wide input voltage range ensures that the AC auxiliary source module 22 can still function properly when the grid voltage fluctuates significantly. Therefore, when the battery auxiliary source module 21 and the AC auxiliary source module 22 are simultaneously accessed, the power grid supply is prioritized by the parallel competing diode power supply scheme, and the overdischarge of the battery is avoided.
At least one ac grid-connected relay 28 is also connected in series between the filtering module 27 and the grid 13. The DC auxiliary source module 31 is further provided with a step-down circuit inside to prevent the output voltage from being too high to burn out the power supply device 7 to be powered at the rear end. The input voltage range of the DC auxiliary source module 31 is 80-500V, and the wide voltage range ensures that the DC auxiliary source module 31 can work normally when the bus voltage is higher due to special working conditions such as high voltage ride through. Since the lowest input voltage of the DC auxiliary source module 31 needs to be smaller than the rated output voltage of the battery auxiliary source module 21, it is set to 80V. Meanwhile, the voltage of the bus can be rapidly discharged and clamped to a lower voltage value when the converter is stopped by setting 80V. The device 7 to be powered can be a control system of a converter, a driving transformer, a relay, a monitoring board or a WIFI stick, etc. The WIFI stick is communication equipment based on a WIFI network, the upper layer is in butt joint with the cloud server, the lower layer is in butt joint with the converter, and the main function is to transmit data of the converter to the cloud server through the WIFI network. Specifically, in this embodiment, the DC auxiliary source module 31 may output 12V to supply power to the control system, and output 7V to supply power to the coil voltage after the grid-connected relay and the soft start relay are attracted, so as to reduce the coil loss. The DC auxiliary source module 31 can also supply power to the MOS or IGBT driving power supply through a forward transformer, and the forward circuit does not need an energy storage inductor, so that the driving power supply voltage is only related to the output voltage of the auxiliary winding of the DC auxiliary source module 31, the influence on the pulse width is not great, and the relative stability of the driving power supply voltage is ensured.
In summary, the auxiliary power supply system in the embodiment has the following advantages:
1. because the bidirectional isolation module is connected in series between the battery and the bus capacitor module, the energy of the power grid can be transmitted to the battery for charging after the topology rectification of the inverter module at the alternating current side of the power grid; a boosting module is further arranged between the photovoltaic cell panel and the battery, and the battery can be discharged after the boosting module and the inversion module pass through the bidirectional isolation module, so that the energy of the photovoltaic cell panel can be transmitted to the built-in battery of the converter and the rear-stage alternating current power grid;
2. the auxiliary power supply system can simultaneously take power from the power grid, the photovoltaic cell panel and the battery in the converter, and the highest voltage value in the power grid, the photovoltaic cell panel and the converter is used as the input of the DC auxiliary source module in a competition power supply mode through the parallel diode, and finally the DC auxiliary source module outputs voltage to the device to be powered, so that the situation of power failure or fluctuation of output voltage of the auxiliary power supply system can not occur, and the reliability of the auxiliary power supply system is improved;
3. under a normal working state, the DC auxiliary source module directly takes electricity from the bus capacitor module, the other two paths of battery auxiliary source modules and the AC auxiliary source module run in a no-load mode, and compared with a two-stage running scheme, the auxiliary source single-stage running scheme improves the system efficiency;
the rated output voltage value of the AC auxiliary source module and the rated output voltage value of the battery auxiliary source module are lower, the lower output voltage is beneficial to the reduction of the number of turns of windings and the size of a magnetic core, so that the cost is reduced and the size can be optimized;
5. when the inversion module works, high-frequency hopping common-mode voltage exists between the HVBUS+ and the HVBUS-to-ground, and the high-frequency hopping common-mode voltage can generate strong conduction and radiation interference to the system, so that the AC auxiliary source module 22, the battery auxiliary source module 21 and the DC auxiliary source module 31 all adopt a flyback scheme, the high-frequency hopping common-mode voltage is isolated by a flyback transformer, an interference backflow path is absent, and the conduction and radiation interference level of the system can be effectively reduced.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present utility model are merely with respect to the mutual positional relationship of the constituent elements of the present utility model in the drawings.
The above-described embodiments are provided for illustrating the technical concept and features of the present utility model, and are intended to be preferred embodiments for those skilled in the art to understand the present utility model and implement the same according to the present utility model, not to limit the scope of the present utility model. All equivalent changes or modifications made according to the principles of the present utility model should be construed to be included within the scope of the present utility model.

Claims (10)

1. The auxiliary power supply system is arranged in the converter and comprises a power taking module and a power supply module which are connected in series, wherein the power taking module is respectively connected with a power grid, a photovoltaic cell panel and a battery in the converter; the power supply module comprises a first power supply module, a second power supply module and a third power supply module which are connected in parallel, wherein the first power supply module comprises a first diode, the second power supply module comprises a second diode, and the third power supply module comprises a third diode;
it is characterized in that the method comprises the steps of,
the electricity taking module comprises:
the input end of the battery auxiliary source module is connected with the battery, and the output end of the battery auxiliary source module is connected with the first diode;
the input end of the AC auxiliary source module is connected with the power grid, and the output end of the AC auxiliary source module is connected with the second diode;
the output end of the bus capacitor module is connected with the third diode;
the photovoltaic cell panel is connected with the battery in series with a boosting module, the battery is connected with the bus capacitor module in series with a bidirectional isolation module, and the bus capacitor module is connected with the power grid in series with an inversion module;
the power supply module further comprises a DC auxiliary source module, wherein the input end of the DC auxiliary source module is respectively connected with the first diode, the second diode and the third diode, and the output end of the DC auxiliary source module is connected with a device to be powered of the converter.
2. The auxiliary power supply system of claim 1 wherein the bi-directional isolation module comprises a DAB circuit, the DAB circuit comprising:
the primary full bridge comprises at least two bridge arms connected in parallel, and each bridge arm comprises at least two switch modules connected in series;
the secondary full bridge comprises at least two parallel bridge arms, wherein each bridge arm comprises at least two switch modules connected in series;
the isolation transformer is respectively connected with the primary full bridge and the secondary full bridge;
DAB inductance, it is with primary side full bridge and isolation transformer connection respectively.
3. The auxiliary power supply system of claim 2, wherein the primary full bridge comprises a first bridge arm, a second bridge arm and a first bus capacitor connected in parallel, the first bridge arm comprising a first switch module and a second switch module connected in series, the second bridge arm comprising a third switch module and a fourth switch module connected in series;
the secondary full bridge comprises a third bridge arm, a fourth bridge arm and a second bus capacitor which are connected in parallel, wherein the third bridge arm comprises a fifth switch module and a sixth switch module which are connected in series, and the fourth bridge arm comprises a seventh switch module and an eighth switch module which are connected in series;
an isolation transformer connected with the primary full bridge and the secondary full bridge respectively, wherein the isolation transformer comprises an isolation primary side and an isolation secondary side, one end of the isolation primary side is connected to a connection point of the third switch module and the fourth switch module, one end of the isolation secondary side is connected to a connection point of the fifth switch module and the sixth switch module, and the other end of the isolation secondary side is connected to a connection point of the seventh switch module and the eighth switch module; the first switch module, the second switch module, the third switch module, the fourth switch module, the fifth switch module, the sixth switch module, the seventh switch module and the eighth switch module comprise diodes and power switches which are mutually connected in parallel, and the power switches are insulated gate bipolar transistors or MOS transistors;
and one end of the DAB inductor is connected to the connection point of the first switch module and the second switch module, and the other end of the DAB inductor is connected to the other end of the isolation primary side.
4. The auxiliary power supply system of claim 1, wherein the inverter module comprises a first inverter leg and a second inverter leg connected in parallel, the first inverter leg comprising a ninth switch module and a tenth switch module connected in series, the second inverter leg comprising an eleventh switch module and a twelfth switch module connected in series; the ninth switch module, the tenth switch module, the eleventh switch module and the twelfth switch module comprise diodes and power switches which are mutually connected in parallel, and the power switches are insulated gate bipolar transistors or MOS transistors.
5. The auxiliary power supply system of claim 4 wherein the power extraction module further comprises a filter module connected in series between the inverter module and the grid;
the filtering module comprises a filtering inductor and a filtering capacitor, one end of the filtering inductor is connected to a connection point of the ninth switching module and the tenth switching module, and the other end of the filtering inductor is connected to the power grid; one end of the filter capacitor is connected to a connection point of the filter inductor and the power grid, and the other end of the filter capacitor is connected to a connection point of the eleventh switch module and the twelfth switch module.
6. The auxiliary power supply system of claim 5 wherein at least one grid-tie relay is further connected in series between the filter module and the grid.
7. The auxiliary power supply system of claim 1 wherein the DC auxiliary source module comprises a buck circuit.
8. The auxiliary power supply system of claim 1 wherein the Boost module comprises a Boost circuit comprising a Boost input capacitance, a Boost switch module, a Boost output capacitance, a Boost inductance, and a Boost diode;
one end of the Boost input capacitor is connected to a connection point of the photovoltaic cell panel and the Boost inductor, and the other end of the Boost input capacitor is connected to a connection point between the photovoltaic cell panel and the battery;
one end of the Boost switch module is connected to a connection point between the Boost inductor and the Boost diode, and the other end of the Boost switch module is connected to a connection point between the photovoltaic panel and the battery;
one end of the Boost output capacitor is connected to a connection point between the Boost diode and the battery, and the other end of the Boost output capacitor is connected to a connection point between the photovoltaic panel and the battery;
one end of the Boost inductor is connected to the photovoltaic cell panel, and the other end of the Boost inductor is connected to the Boost diode;
one end of the Boost diode is connected to the Boost inductor, and the other end of the Boost diode is connected to the battery.
9. The auxiliary power supply system of claim 8, wherein the Boost switch module comprises a diode and a power switch connected in parallel, the power switch being an insulated gate bipolar transistor or a MOS transistor; the Boost diode is a schottky diode.
10. The auxiliary power supply system of claim 1, wherein the converter is an optical storage all-in-one machine, a photovoltaic inverter, an energy storage inverter, or a mobile energy storage device; the device to be powered comprises a control system of the converter, a driving transformer, a relay, a monitoring board or a WIFI stick.
CN202321985660.0U 2023-07-20 2023-07-26 Auxiliary power supply system Active CN220359041U (en)

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