Optical storage all-in-one machine and optical storage system

Abstract

The utility model discloses an optical storage all-in-one machine and an optical storage system, the optical storage all-in-one machine comprises a boost circuit, the input end of the boost circuit is suitable for being connected with a photovoltaic assembly, and the output end of the boost circuit is connected with a DC bus so as to track the maximum power of the photovoltaic assembly; one end of the bidirectional voltage conversion circuit is connected with the battery, and the output end of the bidirectional voltage conversion circuit is connected with the direct current bus, so that voltage conversion is carried out on the voltage of the battery, the converted voltage of the battery is provided for the direct current bus, and voltage conversion is carried out on the voltage of the direct current bus. The converted direct-current bus voltage is used for charging the battery; and the inverter circuit is suitable for being connected with a power grid and an alternating current load to generate alternating current according to the voltage of the direct current bus so as to provide the alternating current to the power grid or the alternating current load, and to generate direct current according to the voltage of the power grid so as to provide the direct current to the direct current bus.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic storage integrated machine and a photovoltaic storage system. Background Art

[0002] The current power system lines and equipment are aging, and power outages are prone to frequent during extreme weather and peak power consumption periods. Therefore, the use of photovoltaic inverters can alleviate the peak power shortage problem and reduce the risk of power outages in energy storage devices. However, photovoltaic inverters and energy storage devices are usually AC-coupled through a home gateway, so the photovoltaic storage system has more equipment, resulting in complex wiring and high costs for the photovoltaic storage system. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the utility model is to propose a photovoltaic storage integrated machine, which integrates the boost circuit of the photovoltaic inverter into the integrated energy storage machine by DC coupling, shares the inverter circuit of the integrated energy storage machine, reduces the number of devices in the photovoltaic storage system, simplifies the wiring of the photovoltaic storage system, and effectively reduces the cost of the photovoltaic storage system.

[0004] The second objective of the present invention is to provide a solar storage system.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the embodiment of the utility model, a photovoltaic and energy storage integrated machine is proposed, including: a boost circuit, the input end of the boost circuit is suitable for connecting to a photovoltaic module, the output end of the boost circuit is connected to a DC bus, and the boost circuit is configured to perform maximum power tracking on the photovoltaic module; a battery and a bidirectional voltage conversion circuit, one end of the bidirectional voltage conversion circuit is connected to the battery, the output end of the bidirectional voltage conversion circuit is connected to the DC bus, the bidirectional voltage conversion circuit is configured to perform voltage conversion on the battery voltage and provide the converted battery voltage to the DC bus, and to perform voltage conversion on the DC bus voltage and use the converted DC bus voltage to charge the battery; an inverter circuit, the input end of the inverter circuit is connected to the DC bus, the output end of the inverter circuit is suitable for connecting to a power grid and an AC load, the inverter circuit is configured to generate AC power according to the DC bus voltage to provide the AC power to the power grid or the AC load, and to generate DC power according to the voltage of the power grid to provide the DC power to the DC bus.

[0006] According to the embodiment of the utility model, the photovoltaic and energy storage integrated machine includes a boost circuit, a battery, a bidirectional voltage conversion circuit, and an inverter circuit, wherein the input end of the boost circuit is suitable for connecting to a photovoltaic module, the output end of the boost circuit is connected to a DC bus, the boost circuit is configured to perform maximum power tracking on the photovoltaic module, one end of the bidirectional voltage conversion circuit is connected to the battery, the output end of the bidirectional voltage conversion circuit is connected to the DC bus, the bidirectional voltage conversion circuit is configured to perform voltage conversion on the battery voltage and provide the converted battery voltage to the DC bus, and to perform voltage conversion on the DC bus voltage and use the converted DC bus voltage to charge the battery, the input end of the inverter circuit is connected to the DC bus, the output end of the inverter circuit is suitable for connecting to a power grid and an AC load, the inverter circuit is configured to generate AC power according to the DC bus voltage to provide the AC power to the power grid or the AC load, and to generate DC power according to the voltage of the power grid to provide the DC power to the DC bus. As a result, the photovoltaic inverter and the integrated energy storage machine share an inverter circuit, and the boost circuit of the photovoltaic inverter is coupled to the DC bus, realizing the integration of the photovoltaic inverter and the integrated energy storage machine, reducing the number of devices in the photovoltaic storage system, thereby simplifying the wiring of the photovoltaic storage system and effectively reducing the cost of the photovoltaic storage system.

[0007] According to one embodiment of the utility model, the integrated photovoltaic and energy storage device also includes: a voltage detection circuit, the input end of the voltage detection circuit is suitable for connecting to a power grid to detect the voltage of the power grid and obtain the power grid voltage; a control unit, the input end of the control unit is connected to the output end of the voltage detection circuit, the output end of the control unit is respectively connected to the boost circuit, the bidirectional voltage conversion circuit and the inverter circuit, and the control unit is configured to control the boost circuit, the bidirectional voltage conversion circuit and the inverter circuit respectively according to the power grid voltage and the received energy scheduling instructions.

[0008] According to one embodiment of the utility model, the inverter circuit is suitable for being connected to the grid and the AC load through a switching switch, the control unit is suitable for being connected to the switching switch, and the control unit is further configured to generate a control instruction according to the grid voltage, and control the switching switch according to the control instruction, so that the inverter circuit operates in a grid-connected mode or an off-grid mode.

[0009] According to an embodiment of the utility model, when the grid voltage meets the preset off-grid condition, the inverter circuit operates in the off-grid mode; or when the grid voltage meets the preset grid-connected condition, the inverter circuit operates in the grid-connected mode.

[0010] According to one embodiment of the utility model, the switching switch includes: a first relay, one end of the first relay is connected to the output end of the inverter circuit; a second relay, one end of the second relay is connected to the other end of the first relay, and the other end of the second relay is suitable for connecting to the power grid; a third relay, one end of the third relay is connected to the other end of the first relay, and the other end of the third relay is suitable for connecting to the AC load.

[0011] According to an embodiment of the utility model, when the power grid is connected, the first relay, the second relay and the third relay are energized; when the power grid is off-grid, the first relay and the second relay are turned off, and the third relay is energized.

[0012] According to one embodiment of the utility model, the bidirectional voltage conversion circuit includes: a first inductor, one end of the first inductor is connected to the positive electrode of the battery, and the other end of the first inductor has a first node; a first switching tube, the collector of the first switching tube is connected to the DC positive bus, and the emitter of the first switching tube is connected to the first node; a second switching tube, the collector of the second switching tube is connected to the first node, and the emitter of the second switching tube is respectively connected to the negative electrode of the battery and the DC negative bus.

[0013] According to one embodiment of the utility model, the boost circuit includes: a second inductor, one end of the second inductor is suitable for connecting to the positive pole of the photovoltaic component, and the other end of the second inductor has a second node; a first diode, the anode of the first diode is connected to the second node, and the cathode of the first diode is connected to the DC positive bus; a third switch tube, the collector of the third switch tube is connected to the second node, the emitter of the third switch tube is connected to the DC negative bus and is suitable for connecting to the negative pole of the photovoltaic component.

[0014] According to one embodiment of the utility model, the integrated optical storage device also includes: a first bus capacitor, one end of which is connected to the DC positive bus; a second bus capacitor, one end of which is connected to the other end of the first bus capacitor, and the other end of which is connected to the DC negative bus.

[0015] According to an embodiment of the utility model, the inverter circuit includes: a first phase bridge arm and a second phase bridge arm, the first phase bridge arm and the second phase bridge arm are connected in parallel and arranged between a DC positive bus and a DC negative bus; a fourth switch tube and a fifth switch tube, the fourth switch tube and the fifth switch tube are connected in series and arranged between the other end of the first bus capacitor and the midpoint of the first phase bridge arm; a sixth switch tube and a seventh switch tube, the sixth switch tube and the seventh switch tube are connected in series and arranged between the other end of the first bus capacitor and the midpoint of the second phase bridge arm; a third inductor, one end of the third inductor is connected to the midpoint of the first phase bridge arm, and the other end of the third inductor is suitable for connecting to the first end of the power grid; a fourth inductor, one end of the fourth inductor is connected to the midpoint of the second phase bridge arm, and the other end of the fourth inductor is suitable for connecting to the second end of the power grid; a first capacitor, one end of the first capacitor is connected to the other end of the third inductor, the other end of the first capacitor is connected to the other end of the first bus capacitor and is suitable for connecting to the third end of the power grid; a second capacitor, one end of the second capacitor is connected to the other end of the fourth inductor, and the other end of the second capacitor is connected to the other end of the first bus capacitor.

[0016] To achieve the above-mentioned purpose, according to a second aspect of the present invention, a photovoltaic storage system is proposed, comprising: a photovoltaic storage integrated machine according to any of the aforementioned embodiments.

[0017] According to the photovoltaic storage system of the embodiment of the utility model, by adopting the above-mentioned photovoltaic storage integrated machine, the boost circuit of the photovoltaic inverter is integrated into the integrated energy storage machine through DC coupling, and the inverter circuit of the integrated energy storage machine is shared, thereby reducing the number of devices in the photovoltaic storage system, thereby simplifying the wiring of the photovoltaic storage system and effectively reducing the cost of the photovoltaic storage system.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a photovoltaic storage system in the related art;

[0020] Figure 2 It is a structural schematic diagram of an integrated optical storage device according to an embodiment of the utility model;

[0021] Figure 3 is a structural schematic diagram of an integrated optical storage device according to another embodiment of the utility model;

[0022] Figure 4 is a schematic structural diagram of a switch according to an embodiment of the utility model;

[0023] Figure 5 It is a circuit diagram of an integrated optical storage device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] It should be noted that this application is made based on the inventor's understanding and research of the following issues:

[0026] In the related art, the problem of power shortage is solved by using a photovoltaic inverter 500, and the photovoltaic inverter 500 and the energy storage integrated device 600 are coupled by AC coupling, such as Figure 1 As shown, the photovoltaic storage system includes a photovoltaic inverter 500, an integrated energy storage machine 600 and a gateway 700. The output end of the photovoltaic inverter 500 is suitable for connecting to the power grid 300 through the gateway 700, and the integrated energy storage machine 600 is also suitable for connecting to the power grid 300 through the gateway 700. The photovoltaic inverter 500 includes a boost circuit 10 and a first inverter circuit 501, the integrated energy storage machine 600 includes a bidirectional voltage conversion circuit 20 and a second inverter circuit 601, and the gateway 700 includes a fourth relay K4 and a fifth relay K5. One end of the fourth relay K4 is connected to the output end of the photovoltaic inverter 500, and the other end of the fourth relay K4 is respectively connected to one end of the fifth relay K5 and the output end of the integrated energy storage machine 600, and is suitable for connecting to the AC load 400. The other end of the fifth relay K5 is suitable for connecting to the power grid 300. Therefore, the photovoltaic storage system has more equipment, resulting in complex wiring, high cost, and poor stability of the photovoltaic storage system.

[0027] Furthermore, for households with photovoltaic inverters 500 installed, it is necessary to purchase an integrated energy storage device 600 to perform AC coupling with the gateway 700 to achieve photovoltaic energy storage scheduling. However, the power of the photovoltaic inverter 500 cannot generally be scheduled in real time. Therefore, in off-grid conditions, if the energy output of the photovoltaic system is greater than the energy required by the photovoltaic storage system, the photovoltaic storage system may become unstable and collapse. For households that have not installed photovoltaic inverters 500, if they need to build a photovoltaic storage system, they need to purchase photovoltaic inverters 500, integrated energy storage devices 600, and home gateways 700, but this is more expensive and the wiring is more complicated.

[0028] Based on this, an embodiment of the utility model provides a photovoltaic storage integrated machine and a photovoltaic storage system, which integrates the boost circuit of the photovoltaic inverter into the integrated energy storage machine through DC coupling, and shares the inverter circuit of the integrated energy storage machine, thereby reducing the number of devices in the photovoltaic storage system, thereby simplifying the wiring of the photovoltaic storage system and effectively reducing the cost of the photovoltaic storage system.

[0029] The following describes the integrated optical storage device and the optical storage system according to the embodiments of the present invention with reference to the accompanying drawings.

[0030] Figure 2 Schematic diagram of the structure of an integrated optical storage device according to an embodiment of the utility model. Figure 2 As shown, the integrated photovoltaic and storage device 100 includes a boost circuit 10 , a battery 20 , a bidirectional voltage conversion circuit 30 , and an inverter circuit 40 .

[0031] Among them, the input end of the boost circuit 10 is suitable for connecting the photovoltaic component 200, the output end of the boost circuit 10 is connected to the DC bus, and the boost circuit 10 is configured to perform maximum power tracking on the photovoltaic component 200; one end of the bidirectional voltage conversion circuit 30 is connected to the battery 20, and the output end of the bidirectional voltage conversion circuit 30 is connected to the DC bus. The bidirectional voltage conversion circuit 30 is configured to perform voltage conversion on the battery 20 voltage and provide the converted battery 20 voltage to the DC bus, and to perform voltage conversion on the DC bus voltage and use the converted DC bus voltage to charge the battery 20; the input end of the inverter circuit 40 is connected to the DC bus, and the output end of the inverter circuit 40 is suitable for connecting the power grid 300 and the AC load 400. The inverter circuit 40 is configured to generate AC power according to the DC bus voltage to provide the AC power to the power grid 300 or the AC load 400, and generate DC power according to the voltage of the power grid 300 to provide the DC power to the DC bus.

[0032] Specifically, Figure 1 As shown, the photovoltaic inverter includes a boost circuit 10 and a first inverter circuit 501 for realizing MPPT (Maximum power point tracking), and the energy storage integrated machine includes a bidirectional voltage conversion circuit 30 arranged between the battery 20 and the DC bus and a second inverter circuit 601 arranged between the DC bus and the power grid 300. Therefore, the boost circuit 10 and the bidirectional voltage conversion circuit 30 are connected to the DC bus, so that the photovoltaic inverter and the energy storage integrated machine can share an inverter circuit 40. By means of DC coupling, the boost circuit 10 of the photovoltaic inverter is integrated into the energy storage integrated machine, forming a structure as shown in FIG. Figure 2 As shown in the figure, the photovoltaic and energy storage integrated machine 100 only needs one inverter circuit 40 to realize the functions of a photovoltaic inverter and an energy storage integrated machine, thereby reducing the number of devices.

[0033] In the above embodiment, the boost circuit and the bidirectional voltage conversion circuit are connected to a common DC bus, so that the photovoltaic inverter and the energy storage device can share one inverter circuit, reducing the number of devices in the photovoltaic storage system, thereby simplifying the wiring of the photovoltaic storage system and effectively reducing the cost of the photovoltaic storage system.

[0034] In some embodiments, Figure 3 As shown, the integrated optical storage device 100 also includes: a voltage detection circuit 50 and a control unit 60, wherein the input end of the voltage detection circuit 50 is suitable for connecting to the power grid 300 to detect the voltage of the power grid 300 and obtain the power grid voltage; the input end of the control unit 60 is connected to the output end of the voltage detection circuit 50, and the output end of the control unit 60 is respectively connected to the boost circuit 10, the bidirectional voltage conversion circuit 30 and the inverter circuit 40, and the control unit 60 is configured to control the boost circuit 10, the bidirectional voltage conversion circuit 30 and the inverter circuit 40 respectively according to the power grid voltage and the received energy scheduling instruction.

[0035] Specifically, in the related art, the photovoltaic inverter and the energy storage integrated machine are controlled separately, and there is a delay in the communication between the photovoltaic inverter and the energy storage integrated machine. Therefore, the power of the photovoltaic inverter cannot be scheduled in real time. When the boost circuit 10 is integrated in the photovoltaic storage integrated machine 100, the control unit 60 controls the boost circuit 10, the bidirectional voltage conversion circuit 30 and the inverter circuit 40 respectively. Therefore, the control unit 60 can realize real-time tracking of the photovoltaic power, and realize energy scheduling according to the photovoltaic power, the battery 20 power, the power of the power grid 300 and the power of the AC load 400 to maintain the stable operation of the photovoltaic storage system. When the control unit 60 determines that the power grid 300 has power according to the grid voltage, it realizes energy scheduling according to the energy scheduling instruction, thereby reasonably allocating the photovoltaic power, the battery 20 power, the power of the power grid 300 and the power of the AC load 400. When the control unit 60 determines that the power grid 300 is powered off according to the grid voltage, it determines the power generation power of the photovoltaic module 200 according to the power of the AC load 400 and the capacity of the battery 20, thereby ensuring that the AC load 400 will not lose power.

[0036] In the above embodiment, when the boost circuit is integrated inside the photovoltaic storage device, the control unit can simultaneously control the boost circuit, the bidirectional voltage conversion circuit and the inverter circuit. Therefore, the control unit can realize the free scheduling of energy, so that the photovoltaic storage device can also operate stably according to the output power of the actual load conditions under off-grid conditions, which effectively improves the stability and energy utilization of the photovoltaic storage system.

[0037] In some embodiments, Figure 4 As shown, the inverter circuit 40 is suitable for being connected to the power grid 300 and the AC load 400 through the switching switch 70, and the control unit 60 is suitable for connecting the switching switch 70. The control unit 60 is also configured to generate a control instruction according to the power grid voltage, and control the switching switch 70 according to the control instruction, so that the inverter circuit 40 operates in a grid-connected mode or an off-grid mode.

[0038] Specifically, in the related art, a controller (not shown) is provided inside the gateway, and the controller controls whether the grid 300 is connected according to the grid voltage, and then the gateway sends a mode switching instruction to the energy storage integrated machine, and the energy storage integrated machine switches between the grid-connected mode and the off-grid mode according to the mode switching instruction. Therefore, the energy storage integrated machine in the related art cannot achieve fast switching between the grid-connected mode and the off-grid mode. In this embodiment, the control unit 60 can directly control the switch 70 according to the grid voltage, so that the inverter circuit 40 can achieve switching between the grid-connected mode and the off-grid mode.

[0039] In the above embodiment, the control unit can control the switching switch and the inverter circuit according to the grid voltage, thereby realizing rapid switching between the grid-connected mode and the off-grid mode, thereby realizing seamless connection between the grid-connected mode and the off-grid mode, and further improving the stability of the photovoltaic storage system.

[0040] In some embodiments, when the grid voltage meets the preset off-grid condition, the inverter circuit 40 operates in the off-grid mode; or when the grid voltage meets the preset grid-connected condition, the inverter circuit 40 operates in the grid-connected mode.

[0041] It can be understood that when the grid voltage meets the preset off-grid condition, it indicates that the grid 300 has lost power, and the photovoltaic and storage integrated machine 100 needs to switch to the off-grid mode to supply power to the AC load 400, therefore, the inverter circuit 40 works in the off-grid mode; when the grid voltage is greater than the preset grid-connected condition, it indicates that the grid 300 has power, and the photovoltaic and storage integrated machine 100 needs to switch to the grid-connected mode, therefore, the inverter circuit 40 works in the grid-connected mode.

[0042] In some embodiments, Figure 4 As shown, the switching switch 70 includes: a first relay K1, a second relay K2 and a third relay K3, wherein one end of the first relay K1 is connected to the output end of the inverter circuit 40; one end of the second relay K2 is connected to the other end of the first relay K1, and the other end of the second relay K2 is suitable for connecting to the power grid 300; one end of the third relay K3 is connected to the other end of the first relay K1, and the other end of the third relay K3 is suitable for connecting to the AC load 400.

[0043] Specifically, the first relay K1 and the second relay K2 are arranged between the inverter circuit 40 and the power grid 300, and the control unit 60 controls the switch state of the first relay K1 and the second relay K2 to control the power grid 300 to be connected to or disconnected from the power grid. The third relay K3 is arranged between the inverter circuit 40 and the AC load 400, and the control unit 60 controls the switch state of the third relay K3 to control whether to supply power to the AC load 400.

[0044] In some embodiments, when the grid 300 is connected to the grid, the first relay K1, the second relay K2 and the third relay K3 are energized; when the grid 300 is off the grid, the first relay K1 and the second relay K2 are OFF, and the third relay K3 is energized.

[0045] Specifically, when the grid 300 has electricity, the grid 300 is connected to the integrated photovoltaic and storage machine 100 and the AC load 400 respectively, so the first relay K1, the second relay K2 and the third relay K3 are all energized; when the grid 300 loses power, the grid 300 cannot provide power to the AC load 400, so the integrated photovoltaic and storage machine 100 needs to be powered independently, so the first relay K1 and the second relay K2 are turned off to make the grid 300 disconnected, and at the same time the third relay K3 is energized, so that the integrated photovoltaic and storage machine 100 can continue to supply power to the AC load 400.

[0046] In the above embodiment, when the inverter circuit switches between the grid-connected mode and the off-grid mode, the third relay is controlled to be energized, thereby ensuring that the AC load does not lose power, thereby further improving the stability of the photovoltaic storage system.

[0047] In some embodiments, Figure 5 As shown, the bidirectional voltage conversion circuit 30 includes: a first inductor L1, a first switch tube Q1 and a second switch tube Q2, wherein one end of the first inductor L1 is connected to the positive electrode of the battery 20, and the other end of the first inductor L1 has a first node J1; the collector of the first switch tube Q1 is connected to the DC positive bus, and the emitter of the first switch tube Q1 is connected to the first node J1; the collector of the second switch tube Q2 is connected to the first node J1, and the emitter of the second switch tube Q2 is respectively connected to the negative electrode of the battery 20 and the DC negative bus.

[0048] Specifically, the bidirectional voltage conversion circuit 30 is a Buck / Boost circuit, which can work in a boost mode or a buck mode according to the control of the control unit 60. For example, if the battery 20 voltage is less than the DC bus voltage, when the battery 20 needs to supply power to the DC bus, the bidirectional voltage conversion circuit 30 performs a boost conversion on the battery 20 voltage to boost the battery 20 voltage to the DC bus voltage and supply power to the DC bus. If the DC bus needs to charge the battery 20, the bidirectional voltage conversion circuit 30 performs a buck conversion on the DC bus voltage to buck the DC bus voltage to the battery 20 voltage and charge the battery 20. The control unit 60 can be connected to the control end of the first switch tube Q1 and the control end of the second switch tube Q2 respectively, and control the switching time of the first switch tube Q1 and the second switch tube Q2 according to the energy scheduling instruction, the grid voltage and the photovoltaic power to achieve bidirectional voltage conversion, thereby achieving energy conversion between the battery 20 and the DC bus.

[0049] In some embodiments, Figure 5 As shown, the boost circuit 10 includes: a second inductor L2, a first diode D1, and a third switch tube Q3, wherein one end of the second inductor L2 is suitable for connecting to the positive electrode of the photovoltaic component 200, and the other end of the second inductor L2 has a second node J2; the anode of the first diode D1 is connected to the second node J2, and the cathode of the first diode D1 is connected to the DC positive bus; the collector of the third switch tube Q3 is connected to the second node J2, and the emitter of the third switch tube Q3 is connected to the DC negative bus and is suitable for connecting to the negative electrode of the photovoltaic component 200.

[0050] Specifically, the boost circuit 10 increases the voltage of the photovoltaic module 200 to the DC bus voltage required by the photovoltaic storage system. When the third switch tube Q3 is turned on, current flows through the second inductor L2, and the inductor stores energy; when the third switch tube Q3 is turned off, the energy stored in the second inductor L2 is released through the first diode D1, and the current flows to the DC positive bus. At this time, the voltage of the inductor increases, and the boost is achieved. The control unit 60 is connected to the control end of the third switch tube Q3, and by controlling the switching time of the third switch tube Q3, the charge and discharge rate of the inductor is adjusted, thereby controlling the output voltage and achieving a stable boost effect.

[0051] In some embodiments, Figures 2 to 5 As shown, the integrated optical storage device 100 also includes: a first bus capacitor Cbus1 and a second bus capacitor Cbus2, wherein one end of the first bus capacitor Cbus1 is connected to the DC positive bus; one end of the second bus capacitor Cbus2 is connected to the other end of the first bus capacitor Cbus1, and the other end of the second bus capacitor Cbus2 is connected to the DC negative bus.

[0052] It can be understood that the first bus capacitor Cbus1 and the second bus capacitor Cbus2 can filter out high-frequency noise and ripple in the circuit, improve the stability of the power supply and the power quality, and the first bus capacitor Cbus1 and the second bus capacitor Cbus2 can divide the DC bus voltage, reducing the voltage that each bus capacitor needs to withstand, so that capacitors with lower rated voltage and lower cost can be used.

[0053] In some embodiments, Figure 4 and 5As shown, the inverter circuit 40 includes: a first phase bridge arm 41 and a second phase bridge arm 42, a fourth switch tube Q4 and a fifth switch tube Q5, a sixth switch tube Q6 and a seventh switch tube Q7, a third inductor L3, a fourth inductor L4, a first capacitor C1, and a second capacitor C2, wherein the first phase bridge arm 41 and the second phase bridge arm 42 are connected in parallel and arranged between the DC positive bus and the DC negative bus; the fourth switch tube Q4 and the fifth switch tube Q5 are connected in series and arranged between the other end of the first bus capacitor Cbus1 and the midpoint O1 of the first phase bridge arm 41; the sixth switch tube Q6 and the seventh switch tube Q7 are connected in series and arranged between the other end of the first bus capacitor Cbus1 and the second phase bridge arm 42 midpoint O2; one end of the third inductor L3 is connected to the midpoint O1 of the first phase bridge arm 41, and the other end of the third inductor L3 is suitable for connecting to the first end L1 of the power grid 300; one end of the fourth inductor L4 is connected to the midpoint 02 of the second phase bridge arm 42, and the other end of the fourth inductor L4 is suitable for connecting to the second end L2 of the power grid 300; one end of the first capacitor C1 is connected to the other end of the third inductor L3, and the other end of the first capacitor C1 is connected to the other end of the first bus capacitor Cbus1 and is suitable for connecting to the third end N of the power grid 300; one end of the second capacitor C2 is connected to the other end of the fourth inductor L4, and the other end of the second capacitor C2 is connected to the other end of the first bus capacitor Cbus1.

[0054] Specifically, the inverter circuit 40 of this embodiment is a T-type three-level inverter, which can effectively reduce the harmonic content of the output current of the inverter circuit 40. The control unit 60 is connected to the control end of each switch tube in the inverter circuit 40, and controls the output voltage and current of the inverter circuit 40 by controlling the switch tube to be in different switching states. The connection point of the first bus capacitor Cbus1 and the second bus capacitor Cbus2 is the third midpoint 03, and the third midpoint 03 can provide a midpoint voltage. The collector of the fourth switch tube Q4 is connected to the third midpoint O3, the emitter of the fourth switch tube Q4 is connected to the collector of the fifth switch tube Q5, the collector of the fifth switch tube Q5 is connected to the midpoint O1 of the first phase bridge arm 41, the collector of the sixth switch tube Q6 is connected to the third midpoint O3, the emitter of the sixth switch tube Q6 is connected to the collector of the seventh switch tube Q7, the collector of the seventh switch tube Q7 is connected to the midpoint O2 of the second phase bridge arm 42, the other ends of the first capacitor C1 and the second capacitor C2 are connected to the third midpoint O3 and are connected to the third terminal N suitable for connecting to the power grid 300. The third inductor L3 and the first capacitor C1 filter the output current of the first phase bridge arm 41, and the fourth inductor L4 and the second capacitor C2 filter the output current of the second phase bridge arm 42 to form two-phase alternating current, thereby connecting to the first terminal L1 and the second terminal L2 of the power grid 300.

[0055] In an optional implementation, the first phase bridge arm 41 and the second phase bridge arm 42 respectively include two switch tubes Q, the two switch tubes Q are connected in series, and the connection point of the two switch tubes Q is the midpoint of the corresponding bridge arm.

[0056] To summarize, the photovoltaic and energy storage integrated machine according to the embodiment of the utility model includes a boost circuit, a battery and a bidirectional voltage conversion circuit and an inverter circuit, wherein the input end of the boost circuit is suitable for connecting a photovoltaic component, the output end of the boost circuit is connected to a DC bus, the boost circuit is configured to perform maximum power tracking on the photovoltaic component, one end of the bidirectional voltage conversion circuit is connected to the battery, the output end of the bidirectional voltage conversion circuit is connected to the DC bus, the bidirectional voltage conversion circuit is configured to perform voltage conversion on the battery voltage and provide the converted battery voltage to the DC bus, and to perform voltage conversion on the DC bus voltage and use the converted DC bus voltage to charge the battery, the input end of the inverter circuit is connected to the DC bus, the output end of the inverter circuit is suitable for connecting a power grid and an AC load, the inverter circuit is configured to generate AC power according to the DC bus voltage to provide the AC power to the power grid or the AC load, and to generate DC power according to the voltage of the power grid to provide the DC power to the DC bus. As a result, the photovoltaic inverter and the integrated energy storage machine share an inverter circuit, and the boost circuit of the photovoltaic inverter is coupled to the DC bus, realizing the integration of the photovoltaic inverter and the integrated energy storage machine, reducing the number of devices in the photovoltaic storage system, thereby simplifying the wiring of the photovoltaic storage system and effectively reducing the cost of the photovoltaic storage system; and, after the boost circuit is integrated into the photovoltaic storage machine, the control unit can simultaneously control the boost circuit, the bidirectional voltage conversion circuit and the inverter circuit, so the control unit can realize the free scheduling of energy, effectively improving the stability and energy utilization of the photovoltaic storage system. Furthermore, the control unit can control the switching switch and the inverter circuit according to the grid voltage, realizing the rapid switching between the grid-connected mode and the off-grid mode, thereby realizing the seamless connection between the grid-connected and off-grid modes, and further improving the stability of the photovoltaic storage system.

[0057] Corresponding to the above embodiment, the embodiment of the utility model further proposes a solar storage system. Figure 2 As shown, the photovoltaic storage system includes: the photovoltaic storage integrated machine 100 of any of the aforementioned embodiments.

[0058] According to the photovoltaic storage system of the embodiment of the utility model, by adopting the above-mentioned photovoltaic storage integrated machine, the boost circuit of the photovoltaic inverter is integrated into the integrated energy storage machine through DC coupling, and the inverter circuit of the integrated energy storage machine is shared, thereby reducing the number of devices in the photovoltaic storage system, thereby simplifying the wiring of the photovoltaic storage system and effectively reducing the cost of the photovoltaic storage system.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0062] In the present utility model, unless otherwise clearly specified or limited in the embodiments, the terms "install", "connect", "connect" and "fix" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific implementation situation.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An integrated optical storage device, characterized in that: include: A boost circuit, wherein an input end of the boost circuit is suitable for connecting to a photovoltaic module, an output end of the boost circuit is connected to a DC bus, and the boost circuit is configured to perform maximum power tracking on the photovoltaic module; A battery and a bidirectional voltage conversion circuit, one end of the bidirectional voltage conversion circuit is connected to the battery, an output end of the bidirectional voltage conversion circuit is connected to the DC bus, and the bidirectional voltage conversion circuit is configured to perform voltage conversion on the battery voltage and provide the converted battery voltage to the DC bus, and to perform voltage conversion on the DC bus voltage and use the converted DC bus voltage to charge the battery; An inverter circuit, wherein the input end of the inverter circuit is connected to the DC bus, the output end of the inverter circuit is suitable for connecting to a power grid and an AC load, and the inverter circuit is configured to generate AC power according to the DC bus voltage to provide the AC power to the power grid or the AC load, and to generate DC power according to the voltage of the power grid to provide the DC power to the DC bus.

2. The integrated optical storage device according to claim 1, characterized in that: Also includes: A voltage detection circuit, wherein an input end of the voltage detection circuit is suitable for connecting to the power grid to detect the voltage of the power grid to obtain the power grid voltage; A control unit, wherein the input end of the control unit is connected to the output end of the voltage detection circuit, the output end of the control unit is respectively connected to the boost circuit, the bidirectional voltage conversion circuit and the inverter circuit, and the control unit is configured to control the boost circuit, the bidirectional voltage conversion circuit and the inverter circuit respectively according to the grid voltage and the received energy scheduling instruction.

3. The integrated optical storage device according to claim 2, characterized in that: The inverter circuit is suitable for being connected to the power grid and the AC load through a switching switch, the control unit is suitable for being connected to the switching switch, and the control unit is further configured to generate a control instruction according to the power grid voltage, and control the switching switch according to the control instruction, so that the inverter circuit operates in a grid-connected mode or an off-grid mode.

4. The integrated optical storage device according to claim 3, characterized in that: When the grid voltage meets the preset off-grid condition, the inverter circuit operates in an off-grid mode; or When the grid voltage meets the preset grid-connected condition, the inverter circuit operates in the grid-connected mode.

5. The integrated optical storage device according to claim 3, characterized in that: The switching switch comprises: a first relay, one end of which is connected to an output end of the inverter circuit; a second relay, one end of the second relay being connected to the other end of the first relay, and the other end of the second relay being suitable for connecting to a power grid; A third relay, one end of the third relay is connected to the other end of the first relay, and the other end of the third relay is suitable for connecting an AC load.

6. The integrated optical storage device according to claim 5, characterized in that: When the power grid is connected to the grid, the first relay, the second relay and the third relay are energized; When the power grid is off-grid, the first relay and the second relay are turned off, and the third relay is turned on.

7. The integrated optical storage device according to any one of claims 1 to 6, characterized in that: The bidirectional voltage conversion circuit comprises: A first inductor, one end of the first inductor is connected to the positive electrode of the battery, and the other end of the first inductor has a first node; a first switch tube, wherein a collector of the first switch tube is connected to a DC positive bus, and an emitter of the first switch tube is connected to the first node; A second switch tube, wherein the collector of the second switch tube is connected to the first node, and the emitter of the second switch tube is respectively connected to the negative electrode of the battery and the DC negative bus.

8. The integrated optical storage device according to any one of claims 1 to 6, characterized in that: The boost circuit comprises: a second inductor, wherein one end of the second inductor is suitable for connecting to the positive electrode of the photovoltaic component, and the other end of the second inductor has a second node; a first diode, wherein an anode of the first diode is connected to the second node, and a cathode of the first diode is connected to a DC positive bus; A third switch tube, wherein the collector of the third switch tube is connected to the second node, and the emitter of the third switch tube is connected to the DC negative bus and is suitable for connecting to the negative electrode of the photovoltaic component.

9. The integrated optical storage device according to any one of claims 1 to 6, characterized in that: Also includes: A first bus capacitor, one end of which is connected to the DC positive bus; A second bus capacitor, one end of the second bus capacitor is connected to the other end of the first bus capacitor, and the other end of the second bus capacitor is connected to the DC negative bus.

10. The integrated optical and storage device according to claim 9, characterized in that: The inverter circuit comprises: a first phase bridge arm and a second phase bridge arm, wherein the first phase bridge arm and the second phase bridge arm are connected in parallel and arranged between the DC positive bus and the DC negative bus; a fourth switch tube and a fifth switch tube, wherein the fourth switch tube and the fifth switch tube are connected in series and arranged between the other end of the first bus capacitor and the midpoint of the first phase bridge arm; a sixth switch tube and a seventh switch tube, wherein the sixth switch tube and the seventh switch tube are connected in series and arranged between the other end of the first bus capacitor and the midpoint of the second phase bridge arm; a third inductor, one end of the third inductor being connected to the midpoint of the first phase bridge arm, and the other end of the third inductor being suitable for connecting to the first end of the power grid; a fourth inductor, one end of the fourth inductor being connected to the midpoint of the second-phase bridge arm, and the other end of the fourth inductor being suitable for connecting to the second end of the power grid; a first capacitor, one end of which is connected to the other end of the third inductor, the other end of which is connected to the other end of the first bus capacitor and is suitable for connecting to a third end of the power grid; A second capacitor, one end of the second capacitor is connected to the other end of the fourth inductor, and the other end of the second capacitor is connected to the other end of the first bus capacitor.

11. A solar energy storage system, characterized in that: include: An integrated optical storage device according to any one of claims 1-10.

Images