CN216215849U - Power supply circuit and photovoltaic power station - Google Patents
Power supply circuit and photovoltaic power station Download PDFInfo
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- CN216215849U CN216215849U CN202122012194.5U CN202122012194U CN216215849U CN 216215849 U CN216215849 U CN 216215849U CN 202122012194 U CN202122012194 U CN 202122012194U CN 216215849 U CN216215849 U CN 216215849U
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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
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- 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 a power supply circuit and a photovoltaic power station, wherein the power supply circuit comprises a power supply positive electrode input end, a power supply negative electrode input end, a power supply output end, a booster circuit, an inverter circuit and a one-way conduction circuit. The positive input end of the booster circuit is connected with the positive input end of the power supply, and the negative input end of the booster circuit is connected with the negative input end of the power supply; the positive input end of the inverter circuit is connected with the positive output end of the booster circuit, the negative input end of the inverter circuit is connected with the negative output end of the booster circuit, and the output end of the inverter circuit is connected with the power output end. The input end of the one-way conduction circuit is connected with the negative electrode input end of the inverter circuit, and the output end of the one-way conduction circuit is connected with the negative electrode output end of the booster circuit. The utility model can cut off the short circuit loop when the positive input end or the negative input end of the power supply is short-circuited to the ground so as to protect the power supply circuit.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to a power supply circuit and a photovoltaic power station.
Background
In a power plant or other power system, the problem of input short-circuiting to ground often occurs, resulting in damage to devices in the power plant or other power system.
For example, in the field of photovoltaic power generation, during construction of a photovoltaic power station, due to a construction process and the like, a short circuit of a Photovoltaic (PV) group to the ground often occurs, and devices such as a switching tube of an inverter are damaged. At present, a scheme for protecting the power system when the input end of the power system is short-circuited to the ground is lacked.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a power supply circuit, which utilizes the characteristic that when an input end of the power supply circuit is short-circuited to the ground, a formed short circuit loop flows between a negative output end of a booster circuit and a positive input end of an inverter circuit, and a one-way conduction circuit is arranged between the negative output end of the booster circuit of the power supply circuit and the positive input end of the inverter circuit; therefore, when the power supply negative electrode input end of the power supply circuit is short-circuited to the ground, the reverse phase is cut off, a short circuit loop is blocked, and the inverter circuit is prevented from being damaged due to the fact that short-circuit current flows to the inverter circuit.
To achieve the above object, the present invention provides a power supply circuit, including:
a power supply positive input end, a power supply negative input end and a power supply output end;
the positive input end of the booster circuit is connected with the positive input end of the power supply, and the negative input end of the booster circuit is connected with the negative input end of the power supply;
the positive input end of the inverter circuit is connected with the positive output end of the booster circuit, the negative input end of the inverter circuit is connected with the negative output end of the booster circuit, and the output end of the inverter circuit is connected with the power supply output end; and
the input end of the unidirectional conduction circuit is connected with the negative electrode input end of the inverter circuit, the output end of the unidirectional conduction circuit is connected with the negative electrode output end of the booster circuit, and the unidirectional conduction circuit is used for being reversely cut off when the negative electrode input end of the power supply is in short circuit with the ground so as to block short-circuit current from flowing to the inverter circuit.
In an embodiment, the unidirectional conducting circuit includes a diode, an anode of the diode is connected to the negative input terminal of the inverter circuit, and a cathode of the diode is connected to the negative output terminal of the voltage boosting circuit.
In one embodiment, the power supply circuit further comprises: a neutral point; the unidirectional turn-on circuit further includes:
the input end of the bypass electronic switch is connected with the input end of the unidirectional conduction circuit, and the output end of the bypass electronic switch is connected with the output end of the unidirectional conduction circuit;
the voltage detection control circuit is respectively connected with the neutral point and the controlled end of the bypass electronic switch;
the voltage detection control circuit is used for detecting the voltage value of the neutral point to the ground and controlling the bypass electronic switch to be switched off when the voltage value of the neutral point to the ground is smaller than a first preset voltage value; and when the voltage value of the neutral point to the ground is greater than the first preset voltage value, controlling the bypass electronic switch to be closed.
In one embodiment, the bypass electronic switch is one or more of a relay, a contactor, a MOS transistor, a triode and an IGBT.
In one embodiment, the inverter circuit includes:
the positive input end of the three-phase bridge inverter circuit is connected with the positive output end of the booster circuit, the negative input end of the three-phase bridge inverter circuit is connected with the negative output end of the booster circuit, and the output end of the three-phase bridge inverter circuit is connected with the power output end of the power circuit;
the inversion control circuit is connected with the output end of the controlled end of the three-phase inversion bridge circuit and is used for outputting a control signal to control the three-phase inversion bridge circuit to work;
the power supply circuit further includes:
the detection end of the current detection circuit is connected with the output end of the three-phase inverter bridge circuit, and the current detection circuit is used for detecting the three-phase current output by the three-phase inverter bridge circuit and outputting a corresponding current detection signal;
the inversion control circuit is also connected with the output end of the current detection circuit and controls the three-phase inversion bridge circuit to stop working when the three-phase currents output by the three-phase inversion bridge circuit are determined to be in the same direction according to the current detection signal output by the current detection circuit.
In one embodiment, the power supply circuit further comprises:
the input end of the output relay is connected with the output end of the three-phase inverter bridge circuit, and the output end of the output relay is connected with the power output end of the power circuit;
the output control circuit is connected with the current detection circuit and the controlled end of the output relay; and the output control circuit is used for controlling the output relay to be switched off when the three-phase currents output by the three-phase inverter bridge circuit are determined to be in the same direction according to the current detection signal output by the current detection circuit.
In one embodiment, the number of the output relays is three, the number of the output ends of the three-phase inverter bridge circuit is three, and the number of the output ends of the power circuit is three;
the input ends of the three output relays are respectively connected with the three output ends of the three-phase inverter bridge circuit in a one-to-one correspondence manner, the output ends of the three output relays are respectively connected with the three power output ends of the power circuit in a one-to-one correspondence manner, and the controlled ends of the three output relays are respectively connected with the output end of the output control circuit.
In one embodiment, the number of the output relays is two, and the two output relays are respectively a first output relay and a second output relay;
the input end of the first output relay is connected with the output end of the three-phase inverter bridge circuit, the output end of the first output relay is connected with the input end of the second output relay, the output end of the second output relay is connected with the power output end of the power circuit, and the controlled ends of the first output relay and the second output relay are respectively connected with the output end of the output control circuit.
In one embodiment, the inverter circuit is a three-level inverter circuit.
The utility model also provides a photovoltaic power station, which comprises a photovoltaic group and the power circuit; and the power supply positive input end and the power supply negative input end of the power supply circuit are respectively connected with the photovoltaic group.
According to the utility model, the unidirectional conduction circuit is arranged between the negative output end of the booster circuit and the negative input end of the inverter circuit, when the power supply circuit normally works, the unidirectional conduction circuit can be normally conducted and work, and when the input end of the power supply circuit is short-circuited to the ground, the unidirectional conduction circuit can be immediately and reversely cut off to cut off a short circuit loop, so that the inverter circuit is prevented from being damaged by short-circuit current. It should be noted that, after short circuit, the short-circuit current formed instantaneously suddenly changes greatly, and compared with a protection scheme that an output relay of an inverter is turned off by triggering overcurrent protection, because the output relay is a mechanical switch, and turning off requires 10ms of turn-off time at least, the unidirectional turn-on circuit of the present invention has a very short reverse turn-off time, so that the inverter circuit can be protected timely and reliably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a power circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power circuit according to an embodiment of the utility model.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 10 | Voltage booster | GND | Ground | |
| 20 | One-way conduction circuit | D1 | Diode with a high- |
|
| 30 | Inverter circuit | D2 | Output diode of inverter circuit | |
| Q1～Q12 | First to twelfth electronic switches | VIN+ | Positive input end of power supply | |
| K1 | Bypass relay | VIN- | Negative input terminal of power supply | |
| K2 | First output relay | A | Negative output end of booster circuit | |
| K3 | Second output relay | B | Negative pole input end of inverter circuit | |
| NE | Neutral point | C1、C2 | Capacitor with a capacitor element |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a power supply circuit.
Referring to fig. 1, in an embodiment of the present invention, the power circuit includes:
a positive power input terminal VIN +, a negative power input terminal VIN-, and a power output terminal;
the positive input end of the boosting circuit 10 is connected with the positive input end VIN + of the power supply, and the negative input end of the boosting circuit 10 is connected with the negative input end VIN-;
an anode input end of the inverter circuit 30 is connected with an anode output end of the booster circuit 10, a cathode input end of the inverter circuit 30 is connected with a cathode output end of the booster circuit 10, and an output end of the inverter circuit 30 is connected with the power supply output end; and
the input end of the unidirectional conducting circuit 20 is connected with the negative input end B of the inverter circuit 30, the output end of the unidirectional conducting circuit 20 is connected with the negative output end a of the booster circuit 10, and the unidirectional conducting circuit 20 is used for being reversely cut off when the negative input end VIN-GND of the power supply is short-circuited to the ground so as to block short-circuit current from flowing to the inverter circuit 30.
The boost circuit 10 may be an isolated boost circuit 10 or a non-isolated boost circuit 10, where the type of the boost circuit 10 is limited to meet the boost requirement.
The inverter circuit 30 may be a single-phase inverter circuit 30, or may be a three-phase inverter circuit 30, or may be a two-level inverter circuit 30, or may be a three-level inverter circuit 30, which is not limited herein.
The unidirectional circuit 20 may be formed by a plurality of diodes or other unidirectional devices in series-parallel combination, or may include only one diode, which is not limited herein.
Referring to fig. 2, when the negative input terminal of the power circuit of the present embodiment is short-circuited to the ground GND, a short-circuit loop is formed, and the short-circuit loop is shown by a dashed line with an arrow in fig. 2, specifically, GND, and the short-circuit loop can flow through the ground GND, the negative output terminal a of the booster circuit 10, the negative input terminal B of the inverter circuit 30, the lower arm (switching tubes Q7 to Q12) of the inverter circuit 30, the output diode D2 of the inverter circuit 30, and the GRID and finally flow back to the ground GND. In other words, when the negative input terminal VIN-GND of the power supply is short-circuited, the short-circuit current will flow into the negative input terminal B of the inverter circuit 30 through the negative output terminal a of the voltage boost circuit 10.
According to the utility model, the unidirectional conduction circuit 20 is arranged between the negative output end A of the booster circuit 10 and the negative input end B of the inverter circuit 30, when the power supply circuit normally works, the unidirectional conduction circuit 20 can be normally conducted and work, and when the negative input end VIN-GND of the power supply is short-circuited, the unidirectional conduction circuit 20 can be immediately and reversely cut off to cut off a short-circuit loop, so that the inverter circuit 30 is prevented from being damaged by short-circuit current. It should be noted that, after short circuit, the short-circuit current formed instantaneously suddenly changes greatly, and compared with a protection scheme that an output relay of the inverter circuit 30 is turned off by triggering overcurrent protection, because the output relay is a mechanical switch, turning off requires a minimum turn-off time of 10ms, the unidirectional conduction circuit 20 of the present invention is turned off in the reverse direction very much, so that the inverter circuit 30 can be protected by GND timely and reliably by GND.
Referring to fig. 2, in an embodiment, the unidirectional conducting circuit 20 includes a protection diode D1, an anode of the protection diode D1 is connected to the negative input terminal a of the inverter circuit 30, and a cathode of the protection diode D1 is connected to the negative output terminal B of the voltage boost circuit 10.
The protection diode D1 may be any type of diode, and is not limited herein.
The present embodiment utilizes the characteristic of unidirectional conduction of the diode, so as to eliminate the possibility that the current flows from the negative output terminal of the voltage boost circuit 10 to the negative input terminal of the inverter circuit 30, that is, to cut off the loop of the short-circuit current, thereby preventing the short-circuit current from flowing through the inverter circuit. The number of the protection diodes D1 is not limited, and when there are a plurality of protection diodes D1, the connection relationship of the protection diodes D1 is not limited as long as unidirectional conduction is satisfied.
Referring to fig. 2, in an embodiment, the power circuit further includes: a neutral point NE; the unidirectional conducting circuit 20 further includes:
the input end of the bypass electronic switch is connected with the input end of the unidirectional conducting circuit 20, and the output end of the bypass electronic switch is connected with the output end of the unidirectional conducting circuit 20;
the voltage detection control circuit is respectively connected with the neutral point NE and the controlled end of the bypass electronic switch;
the voltage detection control circuit is used for detecting the voltage value of the neutral point NE to the ground and controlling the bypass electronic switch to be switched off when the voltage value of the neutral point NE to the ground is smaller than a first preset voltage value; and when the voltage value of the neutral point NE to the ground is greater than the first preset voltage value, controlling the bypass electronic switch to be closed.
The first predetermined voltage value may be a very small voltage value, for example, 5V.
The neutral point can be understood as a zero level position of the inverter circuit, and referring to fig. 2, taking the inverter circuit as a three-level inverter circuit as an example, the neutral point can refer to a common point of a capacitor C1 and a capacitor C2, wherein one end of the capacitor C1 is connected to a positive input end of the three-level inverter circuit, and the capacitor C2 is connected to a negative input end of the three-level inverter circuit.
When the voltage of the neutral point NE to the ground GND is larger than a first preset voltage value, the power supply circuit can be determined to belong to an IT system, the bypass electronic switch is set to be closed, and when short-circuit current is detected, the bypass electronic switch is controlled to be opened. Thus, when the power circuit normally works, the bypass electronic switch in the closed state can bypass the unidirectional conducting circuit 20, and the current is prevented from flowing through the unidirectional conducting circuit 20 to generate loss. Since the unidirectional circuit 20 has a forward voltage drop, when the current flowing through the unidirectional circuit 20 is large, the power loss is equal to the product of the forward voltage drop and the current, and the power loss is large.
When the voltage of the neutral point NE to the ground GND point is smaller than a first preset value, it can be determined that the power circuit is input into the TN system, at this time, in order to avoid that the bypass relay K1 is not timely turned off, and in order to protect the power circuit better, the bypass electronic switch can be set to be normally open, and the circuit is only turned on through the unidirectional conducting circuit 20.
Wherein the IT system represents: the neutral point NE of the power supply circuit is not grounded GND (or is grounded GND through a high impedance), while the exposed part of the device is grounded GND.
The TN system represents: the neutral point NE of the power supply circuit is grounded GND, and the exposed part of the device is connected with the neutral point NE.
The bypass electronic switch is one or a combination of a relay, a contactor, an MOS (metal oxide semiconductor) tube, a triode and an IGBT (insulated gate bipolar transistor).
Referring to fig. 2, in an embodiment, the inverter circuit 30 includes:
a positive input end of the three-phase bridge inverter circuit 30 is connected with a positive output end of the booster circuit 10, a negative input end of the three-phase bridge inverter circuit 30 is connected with a negative output end of the booster circuit 10, and an output end of the three-phase bridge inverter circuit 30 is connected with a power output end of the power circuit;
the inversion control circuit (not shown in the figure) is connected with the output end of the controlled end of the three-phase inversion bridge circuit and is used for outputting a control signal to control the three-phase inversion bridge circuit to work;
the power supply circuit further includes:
the detection end of the current detection circuit is connected with the output end of the three-phase inverter bridge circuit, and the current detection circuit is used for detecting the three-phase current output by the three-phase inverter bridge circuit and outputting a corresponding current detection signal;
the inversion control circuit is also connected with the output end of the current detection circuit and controls the three-phase inversion bridge circuit to stop working when the three-phase currents output by the three-phase inversion bridge circuit are determined to be in the same direction according to the current detection signal output by the current detection circuit.
The three-phase inverter bridge circuit includes a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3, a fourth electronic switch Q4, a fifth electronic switch Q5, a sixth electronic switch Q6, a seventh electronic switch Q7, an eighth electronic switch Q8, a ninth electronic switch Q9, a tenth electronic switch Q10, an eleventh electronic switch Q11, and a twelfth electronic switch Q12, and referring to fig. 2, in this embodiment, the three-phase inverter bridge circuit is a three-level inverter circuit 30. In this embodiment, the first to twelfth electronic switches Q12 may be selected as MOS transistors, triodes, or IGBT switches to obtain faster on/off speed.
The current detection circuit may detect the current through a resistor with a known resistance value, for example, the resistor is connected in series with the output end of the three-phase inverter bridge circuit, and then the voltage across the resistor is detected by the subtractor, and the current flowing through the resistor is calculated according to ohm's law. Or may be detected by a current transformer, which is not limited herein.
When the inverter controller circuit determines that the three-phase currents output by the three-phase inverter bridge circuit are in the same direction according to the current detection signal output by the current detection circuit, the short circuit of the positive electrode input end of the power circuit can be determined, and the first electronic switch, the second electronic switch, the third electronic switch, the fourth electronic switch, the fifth electronic switch, the twelfth electronic switch and the twelfth electronic switch are controlled to be cut off, so that the three-phase inverter bridge circuit stops working, a short circuit loop is cut off, and the inverter is protected. It should be noted that, compared with the off time of the relay being as high as 10ms, the cut-off speed of the switching tube (the first to twelfth electronic switches) is faster, so that the present embodiment can protect the three-phase inverter bridge circuit more timely and reliably when the power circuit is short-circuited.
In one embodiment, the power supply circuit further comprises:
the input ends of the output relays (K2, K3) are connected with the output ends of the three-phase inverter bridge circuits, and the output ends of the output relays (K2, K3) are connected with the power output ends of the power supply circuits;
an output control circuit connected to the current detection circuit and to a controlled terminal of the output relay (K2, K3); and the output control circuit is used for controlling the output relays to be switched off (K2, K3) when the three-phase currents output by the three-phase inverter bridge circuit are determined to be in the same direction according to the current detection signals output by the current detection circuit.
In this embodiment, the output relays (K2, K3) are mechanical switches, and when the output control circuit determines that the positive input end of the power circuit is short-circuited, the output relays are controlled to be turned off, so that a short-circuit loop can be completely cut off physically, and the three-phase inverter bridge circuit is reliably protected.
Referring to fig. 2, in an embodiment, the number of the output relays (K2, K3) is three, the number of the output ends of the three-phase inverter bridge circuit is three, and the number of the output ends of the power circuit is three;
the input ends of the three output relays (K2, K3) are respectively connected with the three output ends of the three-phase inverter bridge circuit in a one-to-one correspondence manner, the output ends of the three output relays (K2, K3) are respectively connected with the three power supply output ends of the power supply circuit in a one-to-one correspondence manner, and the controlled ends of the three output relays (K2, K3) are respectively connected with the output end of the output control circuit.
The three output ends of the three-phase inverter bridge are respectively corresponding to three phase currents of three-phase current. The output ends of the power supply circuit are also three and respectively correspond to three phase currents of three-phase current. In the embodiment, three output relays (K2 and K3) are arranged, so that three-phase current can be completely cut off in the case of short circuit, and the three-phase inverter bridge circuit can be reliably protected.
Referring to fig. 2, in one embodiment, the number of the output relays is two, namely a first output relay K2 and a second output relay K3;
the input end of the first output relay K2 is connected with the output end of the three-phase inverter bridge circuit, the output end of the first output relay K2 is connected with the input end of the second output relay K3, the output end of the second output relay K3 is connected with the power output end of the power circuit, and the controlled ends of the first output relay K2 and the second output relay K3 are respectively connected with the output end of the output control circuit.
In the present embodiment, by setting the number of the output relays to two, when a short circuit occurs in the power supply circuit, as long as any one of the first output relay K2 and the second output relay K3 is not abnormal, the short circuit can be normally turned off, and the short circuit can be cut off. The damage of short-circuit current to the three-phase inverter bridge circuit caused by the fact that the relay fails to be turned off due to faults is avoided.
The utility model also provides a photovoltaic power station, which comprises a photovoltaic group and the power circuit; the specific structure of the power supply circuit refers to the above embodiments, and since the photovoltaic power station adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
And the power supply positive input end and the power supply negative input end of the power supply circuit are respectively connected with the photovoltaic group.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A power supply circuit, comprising:
a power supply positive input end, a power supply negative input end and a power supply output end;
the positive input end of the booster circuit is connected with the positive input end of the power supply, and the negative input end of the booster circuit is connected with the negative input end of the power supply;
the positive input end of the inverter circuit is connected with the positive output end of the booster circuit, the negative input end of the inverter circuit is connected with the negative output end of the booster circuit, and the output end of the inverter circuit is connected with the power supply output end; and
the input end of the unidirectional conduction circuit is connected with the negative electrode input end of the inverter circuit, the output end of the unidirectional conduction circuit is connected with the negative electrode output end of the booster circuit, and the unidirectional conduction circuit is used for being reversely cut off when the negative electrode input end of the power supply is in short circuit with the ground so as to block short-circuit current from flowing to the inverter circuit.
2. The power supply circuit of claim 1 wherein the unidirectional conducting circuit comprises a diode, an anode of the diode is connected to the negative input terminal of the inverter circuit, and a cathode of the diode is connected to the negative output terminal of the boost circuit.
3. The power supply circuit of claim 1, wherein the power supply circuit further comprises: a neutral point; the unidirectional turn-on circuit further includes:
the input end of the bypass electronic switch is connected with the input end of the unidirectional conduction circuit, and the output end of the bypass electronic switch is connected with the output end of the unidirectional conduction circuit;
the voltage detection control circuit is respectively connected with the neutral point and the controlled end of the bypass electronic switch;
the voltage detection control circuit is used for detecting the voltage value of the neutral point to the ground and controlling the bypass electronic switch to be switched off when the voltage value of the neutral point to the ground is smaller than a first preset voltage value; and when the voltage value of the neutral point to the ground is greater than the first preset voltage value, controlling the bypass electronic switch to be closed.
4. The power supply circuit of claim 3, wherein the bypass electronic switch is one or more of a relay, a contactor, a MOS transistor, a triode, and an IGBT.
5. The power supply circuit according to claim 1, wherein the inverter circuit comprises:
the positive input end of the three-phase bridge inverter circuit is connected with the positive output end of the booster circuit, the negative input end of the three-phase bridge inverter circuit is connected with the negative output end of the booster circuit, and the output end of the three-phase bridge inverter circuit is connected with the power output end of the power circuit;
the inversion control circuit is connected with the output end of the controlled end of the three-phase inversion bridge circuit and is used for outputting a control signal to control the three-phase inversion bridge circuit to work;
the power supply circuit further includes:
the detection end of the current detection circuit is connected with the output end of the three-phase inverter bridge circuit, and the current detection circuit is used for detecting the three-phase current output by the three-phase inverter bridge circuit and outputting a corresponding current detection signal;
the inversion control circuit is also connected with the output end of the current detection circuit and controls the three-phase inversion bridge circuit to stop working when the three-phase currents output by the three-phase inversion bridge circuit are determined to be in the same direction according to the current detection signal output by the current detection circuit.
6. The power supply circuit of claim 5, wherein the power supply circuit further comprises:
the input end of the output relay is connected with the output end of the three-phase inverter bridge circuit, and the output end of the output relay is connected with the power output end of the power circuit;
the output control circuit is connected with the current detection circuit and the controlled end of the output relay; and the output control circuit is used for controlling the output relay to be switched off when the three-phase currents output by the three-phase inverter bridge circuit are determined to be in the same direction according to the current detection signal output by the current detection circuit.
7. The power circuit of claim 6 wherein the number of said output relays is three, the number of said three-phase inverter bridge circuit outputs is three, and the number of said power circuit outputs is three;
the input ends of the three output relays are respectively connected with the three output ends of the three-phase inverter bridge circuit in a one-to-one correspondence manner, the output ends of the three output relays are respectively connected with the three power output ends of the power circuit in a one-to-one correspondence manner, and the controlled ends of the three output relays are respectively connected with the output end of the output control circuit.
8. The power supply circuit according to claim 6, wherein the number of the output relays is two, respectively, a first output relay and a second output relay;
the input end of the first output relay is connected with the output end of the three-phase inverter bridge circuit, the output end of the first output relay is connected with the input end of the second output relay, and the output end of the second output relay is connected with the power output end of the power circuit;
and the controlled ends of the first output relay and the second output relay are respectively connected with the output end of the output control circuit.
9. The power supply circuit according to claim 1, wherein the inverter circuit is a three-level inverter circuit.
10. A photovoltaic power plant, characterized by comprising a photovoltaic group and a power supply circuit according to any one of claims 1-9; and the power supply positive input end and the power supply negative input end of the power supply circuit are respectively connected with the photovoltaic group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122012194.5U CN216215849U (en) | 2021-08-24 | 2021-08-24 | Power supply circuit and photovoltaic power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122012194.5U CN216215849U (en) | 2021-08-24 | 2021-08-24 | Power supply circuit and photovoltaic power station |
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| CN216215849U true CN216215849U (en) | 2022-04-05 |
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