CN213402467U - Photovoltaic system and air conditioning system - Google Patents
Photovoltaic system and air conditioning system Download PDFInfo
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- CN213402467U CN213402467U CN202022706051.XU CN202022706051U CN213402467U CN 213402467 U CN213402467 U CN 213402467U CN 202022706051 U CN202022706051 U CN 202022706051U CN 213402467 U CN213402467 U CN 213402467U
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Abstract
The utility model discloses a photovoltaic system and air conditioning system, this photovoltaic system include direct current bus, direct current bus has at least one input and at least one output, input and output all are connected with an input unit or output unit at least, input unit and output unit all are connected with direct current bus's electric capacity, direct current bus still is provided with the control unit, the on-off state of its and direct current bus is switched according to input unit or output unit's running state to the control unit. The utility model discloses an above-mentioned setting, the control unit can in time cut off according to every input unit or output unit's running state, has avoided single input short circuit to lead to electric capacity to discharge rapidly and accidents such as explosion, has improved the security and the stability of whole system.
Description
Technical Field
The utility model relates to a photovoltaic system technical field especially relates to photovoltaic system and air conditioning system.
Background
FIG. 1 shows a photovoltaic air conditioning system with photovoltaic cell voltage connected to a high voltage DC bus via a DC/DC converter; the energy storage battery is connected into the high-voltage direct current bus through the energy storage DC/DC; on one hand, the energy in the bus can be connected to the grid or can be taken from the power grid through the bidirectional DC/AC converter, and on the other hand, the energy in the bus supplies power to the load of the compressor through the DC/AC converter; all converters in the system are connected to a direct-current bus capacitor, when any converter in the system has a short-circuit fault, the positive electrode and the negative electrode of the bus capacitor can be in short circuit, so that the bus capacitor can be rapidly discharged to cause explosion, the whole system is broken down, and the safety coefficient is low.
SUMMERY OF THE UTILITY MODEL
In order to solve the lower defect of factor of safety among the above-mentioned photovoltaic air conditioning system, the utility model provides a photovoltaic system and air conditioning system.
The utility model discloses a technical scheme be, photovoltaic system, including direct current bus, direct current bus has at least one input and at least one output, input and output all are connected with an input unit or output unit at least, input unit and output unit all are connected with direct current bus's electric capacity, direct current bus still is provided with the control unit, the on-off state of its and direct current bus is switched according to input unit or output unit's running state to the control unit.
Preferably, the operation state of the input unit or the output unit includes a normal operation state and an abnormal operation state,
when the input unit or the output unit is in a normal operation state, the input unit or the output unit is communicated with the direct current bus;
and when the input unit or the output unit is in an abnormal operation state, the input unit or the output unit is disconnected with the direct current bus.
Preferably, the control unit includes a switch disposed between each of the input unit and the output unit and the capacitor, and when the switch is closed, the input unit or the output unit and the dc bus path are connected; when the switch is disconnected, the input unit or the output unit is disconnected with the direct current bus.
Preferably, the control unit further includes: and the current transformers are respectively arranged between each input unit or output unit and the direct current bus, one end of each current transformer is connected with the capacitor, and the other end of each current transformer is connected with the switch.
Preferably, inverters are connected between the input unit or the output unit and the direct current bus, one end of each inverter is connected with the input unit or the output unit, and the other end of each inverter is connected with the control unit.
Preferably, the input unit is an energy storage battery unit, and the converter between the energy storage battery unit and the direct current bus is an energy storage DC/DC converter.
Preferably, the input unit is a photovoltaic cell panel unit, and the converter between the photovoltaic cell panel unit and the direct current bus is a DC/DC converter.
Preferably, the output unit is a compressor driving unit, and an inverter between the compressor driving unit and the DC bus is a DC/AC inverter.
Preferably, the direct current bus is further connected with a power grid, and a converter between the power grid and the direct current bus is a bidirectional DC/AC converter.
The utility model also provides an air conditioning system, it includes aforementioned photovoltaic system.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the control unit can be timely cut off according to the running state of each input unit or output unit, so that accidents such as capacitor explosion caused by rapid discharge due to short circuit of a single input end are avoided, and the safety and the stability of the whole system are improved;
2. after the input unit or the output unit in the abnormal operation state and the direct current bus are in the open circuit state, the open circuit state or the state switching action of the unit is fed back to the main control system and the alarm is started, so that the fault part can be fed back to maintenance personnel in time, and the fault positioning is convenient;
3. because the fault part is timely disconnected from the system, the normal operation of the rest part of the system is not influenced, the aim of continuously supplying power to the load can be achieved, and the influence of the fault on the load is greatly eliminated.
Drawings
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings, in which:
FIG. 1 is a diagram of a photovoltaic air conditioning system;
fig. 2 is a system diagram of the present embodiment.
Detailed Description
The photovoltaic system comprises a direct-current bus, wherein the direct-current bus is provided with at least one input end and at least one output end, the input end and the output end are both connected with at least one input unit or output unit, the input unit and the output unit are both connected with a capacitor of the direct-current bus, the direct-current bus is further provided with a control unit, and the control unit switches the on-off state of the control unit and the direct-current bus according to the running state of the input unit or the output unit.
The operation states of the input unit or the output unit comprise a normal operation state and an abnormal operation state, and when the input unit or the output unit is in the normal operation state, the input unit or the output unit is communicated with the direct-current bus; and when the input unit or the output unit is in an abnormal operation state, the input unit or the output unit is disconnected with the direct current bus. The abnormal state may be set according to different operating environments, and may be a short circuit state in one embodiment.
The control unit comprises switches arranged between each input unit and each output unit and a capacitor, and when the switches are closed, the input units or the output units and the direct current bus circuit are connected; when the switch is disconnected, the input unit or the output unit is disconnected with the direct current bus. The control unit further includes: and the current transformers are respectively arranged between each input unit or output unit and the direct current bus, one end of each current transformer is connected with the capacitor, and the other end of each current transformer is connected with the switch.
Certainly, the current transformer is communicated with a main control system, the main control system is in communication connection with all switches, when the current transformer detects that the current change of a certain input unit or output unit accords with a short-circuit state, a detection signal can be uploaded to the main control system, the main control system controls the corresponding switch to execute actions according to the signal, and the access of the input unit or output unit is cut off, so that the input unit or output unit and the direct-current bus are switched to the short-circuit state.
Meanwhile, converters are connected between the input unit or the output unit and the direct current bus, one end of each converter is connected with the input unit or the output unit, and the other end of each converter is connected with the control unit. Different input ends and output ends can be connected with converters with different functions and types.
The control method of the photovoltaic system comprises the following steps:
and judging the operating state of each input unit and each output unit, and switching the input unit or the output unit and the direct current bus into an open circuit state if the input unit or the output unit in the abnormal operating state exists.
And after the input unit or the output unit in the abnormal operation state and the direct current bus are in the open circuit state, the open circuit state or the state switching action of the unit is fed back to the main control system and the alarm is started.
Example (b): the photovoltaic system comprises a photovoltaic DC/DC part, an energy storage DC/DC part, a DC/AC part, a compressor driving and motor part and a bus capacitor C1, wherein a photovoltaic cell panel is an external system component in engineering, and particularly comprises switches K1, K2, K3 and K4, and current transformers U1, U2, U3 and U4.
Specifically, the photovoltaic DC/DC part is used as an input unit of the direct current bus and comprises a photovoltaic cell panel unit, and a converter between the photovoltaic cell panel unit and the direct current bus is a DC/DC converter; the energy storage DC/DC part is used as an input unit of the direct current bus and comprises an energy storage battery unit, and a converter between the energy storage battery unit and the direct current bus is an energy storage DC/DC converter; the compressor driving and motor part is used as one output end of the direct current bus and comprises a compressor driving unit, and an inverter between the compressor driving unit and the direct current bus is a DC/AC inverter; the DC/AC section includes a grid and a converter, which is a bidirectional DC/AC converter, so that the grid can be used as both an output and an input.
The positive electrode of the photovoltaic DC/DC converter is connected to a direct-current bus through a switch K1 and a current transformer U1, the positive electrode of the energy storage DC/DC converter is connected to the direct-current bus through a switch K2 and a current transformer U2, the bidirectional DC/AC converter is connected to the direct-current bus through a switch K3 and a current transformer U3, and the compressor drives the DC/AC converter to be connected to the direct-current bus through a switch K4 and a current transformer U4.
The current transformer U1 monitors the current of the photovoltaic DC/DC converter connected to the direct current bus, and the current transformer U2 monitors the current of the energy storage DC/DC converter connected to the direct current bus; the current transformer U3 monitors the current of the bidirectional DC/AC converter connected to the DC bus, and the current transformer U4 monitors the current of the compressor driving the DC/AC converter connected to the DC bus. And setting the maximum value of the current of each converter access bus according to the system operation parameters. The actual run-time situation is as follows:
(1) when the current transformer U1 monitors that the current of the photovoltaic DC/DC converter connected to the direct current bus is larger than a set value, the switch K1 is disconnected, the connection between the photovoltaic DC/DC and the system is cut off, meanwhile, the disconnected state of K1 is uploaded to the main control system, the fault of the photovoltaic DC/DC converter is reported, and in the state, the power grid or the energy storage DC/DC continuously supplies power to the load;
(2) when the current transformer U2 monitors that the current of the energy storage DC/DC converter connected to the direct current bus is larger than a set value, the switch K2 is disconnected, the connection between the energy storage DC/DC converter and a system is cut off, meanwhile, the disconnected state of K2 is uploaded to the main control system, the fault of the energy storage DC/DC converter is reported, and in the state, the power grid or the photovoltaic DC/DC continuously supplies power to the load;
(3) when the current transformer U3 monitors that the current of the bidirectional DC/AC converter connected to the direct current bus is larger than a set value, the switch K3 is disconnected, the connection between the bidirectional DC/AC converter and a system is cut off, meanwhile, the disconnected state of K3 is uploaded to the main control system, the fault of the bidirectional DC/AC converter is reported, and under the state, the energy storage DC/DC or the photovoltaic DC/DC continuously supplies power to a load;
(4) when the current transformer U4 monitors that the current of the compressor driving DC/AC converter connected to the DC bus is larger than a set value, the switch K4 is disconnected, the connection between the compressor driving DC/AC converter and a system is cut off, meanwhile, the disconnected state of K4 is uploaded to the main control system, and the fault of the compressor driving DC/AC converter is reported.
It should be noted that in the preferred embodiment,
photovoltaic cell board unit: the solar cell panel is the only output end after any solar cell panel and accessory devices thereof are combined in series and parallel.
DC/DC converter: the photovoltaic bus topology is used for converting the direct-current voltage of the photovoltaic input port into voltages at two ends of a direct-current bus, and the specific topology can be BUCK, BOOST, forward, flyback, half bridge, full bridge and the like; typically BOOST or a derivative topology thereof.
A main control system: all the main control systems can be single chips or any chips with a certain connection relation, are mainly suitable for carrying out corresponding operation processing on signals detected by the current transformer, simultaneously generate corresponding PWM signals to process all the switch tubes, and judge whether protection is needed or not.
And D, direct current bus: the direct current bus can be fixed direct current voltage or wide-range direct current voltage, is mostly an open interface, and can be used for arbitrary connection.
Bidirectional DC/AC converter: the direct-current bus voltage can be converted into single-phase alternating-current voltage, and the generated voltage can be in grid-connected operation; the voltage of the alternating current power grid can be converted into the voltage required by the direct current bus.
DC/AC converter: and converting the DC bus voltage into the voltage required by the AC compressor load.
Meanwhile, the embodiment also discloses an air conditioning system, which comprises the photovoltaic system or adopts the control method.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The photovoltaic system comprises a direct current bus and is characterized in that the direct current bus is provided with at least one input end and at least one output end, the input end and the output end are both connected with at least one input unit or output unit, the input unit and the output unit are both connected with a capacitor of the direct current bus, the direct current bus is further provided with a control unit, and the control unit switches the on-off state of the control unit and the direct current bus according to the running state of the input unit or the output unit.
2. The photovoltaic system of claim 1, wherein the operating state of the input unit or the output unit includes a normal operating state and an abnormal operating state,
when the input unit or the output unit is in a normal operation state, the input unit or the output unit is communicated with the direct current bus;
and when the input unit or the output unit is in an abnormal operation state, the input unit or the output unit is disconnected with the direct current bus.
3. The photovoltaic system of claim 1, wherein the control unit comprises a switch disposed between each of the input and output units and the capacitor, and when the switch is closed, the input or output unit is connected to a dc bus; when the switch is disconnected, the input unit or the output unit is disconnected with the direct current bus.
4. The photovoltaic system of claim 3, wherein the control unit further comprises: and the current transformers are respectively arranged between each input unit or output unit and the direct current bus, one end of each current transformer is connected with the capacitor, and the other end of each current transformer is connected with the switch.
5. The photovoltaic system according to claim 1, wherein a converter is connected between the input unit or the output unit and the dc bus, and one end of the converter is connected with the input unit or the output unit, and the other end of the converter is connected with the control unit.
6. The photovoltaic system of claim 5, wherein the input unit is an energy storage battery unit, and the converter between the energy storage battery unit and the direct current bus is an energy storage DC/DC converter.
7. The photovoltaic system of claim 5, wherein the input unit is a photovoltaic panel unit and the converter between the photovoltaic panel unit and the DC bus is a DC/DC converter.
8. The photovoltaic system of claim 5, wherein the output unit is a compressor drive unit and the inverter between the compressor drive unit and the DC bus is a DC/AC inverter.
9. The photovoltaic system of claim 5, wherein the DC bus is further connected to a power grid, and wherein the converter between the power grid and the DC bus is a bi-directional DC/AC converter.
10. Air conditioning system, characterized in that it comprises a photovoltaic system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022706051.XU CN213402467U (en) | 2020-11-20 | 2020-11-20 | Photovoltaic system and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022706051.XU CN213402467U (en) | 2020-11-20 | 2020-11-20 | Photovoltaic system and air conditioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213402467U true CN213402467U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022706051.XU Active CN213402467U (en) | 2020-11-20 | 2020-11-20 | Photovoltaic system and air conditioning system |
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| Country | Link |
|---|---|
| CN (1) | CN213402467U (en) |
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- 2020-11-20 CN CN202022706051.XU patent/CN213402467U/en active Active
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