Power generation and energy storage circuit and power generation and energy storage system

Abstract

The utility model discloses a power generation and energy storage circuit and a power generation and energy storage system. The power generation and energy storage circuit comprises a boost module, a buck-boost module, a buck module and a control module. The input end of the boost module is connected with the photovoltaic panel, and the output end of the boost module is connected with the first input and output end of the buck-boost module and the input end of the buck module. The second input and output end of the boost-buck module is connected with the energy storage module, the output end of the step-down module is connected with the micro inverter, the input end of the step-down module is further connected with the output end of the boost-buck module, and the control module is connected with the boost module, the boost-buck module and the step-down module. According to the scheme of the embodiment of the utility model, the control module controls the step-down module to simulate the output power curve of the photovoltaic panel, so that the electric energy stored by the energy storage module can be output to the micro inverter to supply power to the load after being subjected to step-up processing of the step-up and step-down processing of the step-down module, and the energy utilization efficiency of the photovoltaic panel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a power generation and energy storage circuit and a power generation and energy storage system. Background Art

[0002] With the application and popularization of photovoltaic power generation and energy storage technology, small photovoltaic systems are gradually popularized among household users due to their flexible installation and low cost. They are installed in gardens or balconies. The power of these photovoltaic systems is relatively small. Micro inverters are widely used in small-power photovoltaic systems due to their low input voltage, safety, and simple installation. However, due to the reduction of grid-connected electricity prices and the cancellation of grid-connected subsidies, when the excess electricity generated by small photovoltaic systems cannot be sent to the grid, the economic efficiency of photovoltaic systems will be reduced. If the system adds a reverse current power limiting function, the power generation of photovoltaic panels will be limited, thereby affecting the energy utilization efficiency of the photovoltaic system and the economic efficiency of the photovoltaic power generation system. Utility Model Content

[0003] The utility model provides a power generation energy storage circuit and a power generation energy storage system to solve the technical problems of low energy utilization efficiency and low economic benefit of existing small photovoltaic power generation systems.

[0004] According to one aspect of the utility model, a power generation and energy storage circuit is provided, comprising a boost module, a buck-boost module, a buck module and a control module; the input end of the boost module is connected to a photovoltaic panel, and the output end of the boost module is respectively connected to the first input and output end of the buck-boost module and the input end of the buck module; the boost module is used to boost the input voltage and then output it;

[0005] The second input-output terminal of the buck-boost module is connected to the energy storage module, and the buck-boost module is used to convert the voltage between the first input-output terminal and the second input-output terminal to charge and discharge the energy storage module;

[0006] The output end of the step-down module is connected to the micro inverter, and the input end of the step-down module is also connected to the output end of the step-up / step-down module. The step-down module is used to step down the voltage at the input end and then output it;

[0007] The control module is connected to the boost module, the buck-boost module and the buck module respectively, and is used to control the operation of the boost module, the buck-boost module and the buck module.

[0008] Optionally, a voltage stabilizing module is further included, and the voltage stabilizing module is connected in parallel with the output end of the boosting module.

[0009] Optionally, the boost module includes: a first inductor, a first diode and a first transistor;

[0010] The first end of the first inductor is connected to the positive electrode of the photovoltaic panel, and the second end of the first inductor is connected to the anode of the first diode; the cathode of the first diode is connected to the buck-boost module and the step-down module respectively; the first electrode of the first transistor is connected to the anode of the first diode, the second electrode of the first transistor is connected to the negative electrode of the photovoltaic panel, and the gate of the first transistor is connected to the control module.

[0011] Optionally, the buck-boost module includes: a second inductor, a second transistor and a third transistor;

[0012] The first end of the second inductor is connected to the positive electrode of the energy storage module, and the second end of the second inductor is connected to the first electrode of the second transistor; the second electrode of the second transistor is connected to the output end of the boost module, and the gate of the second transistor is connected to the control module; the first electrode of the third transistor is connected to the second end of the second inductor, and the second electrode of the third transistor is connected to the negative electrode of the energy storage module and the output end of the boost module.

[0013] Optionally, the step-down module includes: a fourth transistor, a third inductor, a second diode and a first capacitor;

[0014] The first electrode of the fourth transistor is connected to the output end of the boost module, the second electrode of the fourth transistor is connected to the first end of the third inductor, and the gate of the fourth transistor is connected to the control module; the second end of the third inductor is connected to the positive electrode of the micro inverter; the cathode of the second diode is connected to the second electrode of the fourth transistor, and the anodes of the two diodes are respectively connected to the output end of the boost module and the negative electrode of the micro inverter; the first end of the first capacitor is connected to the second end of the third inductor, and the second end of the first capacitor is connected to the anode of the second diode.

[0015] Optionally, the voltage stabilizing module includes a second capacitor, a first end of the second capacitor is connected to the cathode of the first diode, and a second end of the second capacitor is connected to the second electrode of the first transistor.

[0016] Optionally, the control module outputs a PWM signal to control the operation of the boost module, the buck-boost module and the buck module.

[0017] According to another aspect of the utility model, there is provided a power generation and energy storage system, comprising the power generation and energy storage circuit, the photovoltaic panel and the micro inverter as described in any one of the first aspects.

[0018] Optionally, the energy storage module includes a battery.

[0019] Optionally, the power generation power of the photovoltaic panel is less than 2000W.

[0020] The power generation and energy storage circuit provided by the embodiment of the utility model connects the photovoltaic panel with the energy storage module through the boost module and the buck-boost module. When the boost module and the buck-boost module are controlled to work by the control module, the electric energy converted and output by the photovoltaic panel is stored in the energy storage module after being boosted by the boost module and bucked by the buck-boost module; the photovoltaic panel is connected with the micro inverter through the boost module and the buck module. When the boost module and the buck module are controlled to work by the control module, the electric energy converted and output by the photovoltaic panel is directly output to the micro inverter for powering the load after being boosted by the boost module and bucked by the buck module. In addition, the energy storage module is connected to the micro inverter through the buck-boost module and the buck module, and the buck module can be controlled by the control module to simulate the output power curve of the photovoltaic panel, so that the electric energy stored in the energy storage module can be output to the micro inverter for powering the load after being boosted by the buck-boost module and bucked by the buck module, thereby improving the energy utilization efficiency of the photovoltaic panel and improving the economy of the power generation system.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a power generation and energy storage circuit provided according to an embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of another power generation and energy storage circuit provided according to an embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of another power generation and energy storage circuit provided according to an embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of energy flow in a charging priority mode of a power generation and energy storage circuit provided according to an embodiment of the utility model;

[0027] Figure 5It is a schematic diagram of energy flow in a charging priority mode of another power generation and energy storage circuit provided according to an embodiment of the utility model;

[0028] Figure 6 It is a schematic diagram of energy flow in a load priority mode of a power generation and energy storage circuit provided according to an embodiment of the utility model;

[0029] Figure 7 It is a schematic diagram of energy flow in a load priority mode of another power generation and energy storage circuit provided according to an embodiment of the utility model;

[0030] Figure 8 It is a schematic diagram of energy flow in a power generation and energy storage circuit in a discharge mode according to an embodiment of the utility model;

[0031] Fig. 9 It is a structural schematic diagram of a power generation and energy storage system provided according to an embodiment of the utility model. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Figure 1 It is a structural schematic diagram of a power generation and energy storage circuit provided according to an embodiment of the utility model. Figure 1The power generation and energy storage circuit includes a boost module 110, a buck module 130, a buck-boost module 120, a buck module 130 and a control module 140; the input end of the boost module 110 is connected to the photovoltaic panel, and the output end of the boost module 110 is respectively connected to the first input and output end of the buck-boost module 120 and the input end of the buck module 130; the boost module 110 is used to boost the input voltage and output it; the second input and output end of the buck-boost module 120 is connected to the energy storage module, and the buck-boost module 120 is used to boost the first input and output The voltage between the output end and the second input-output end is converted to charge and discharge the energy storage module; the output end of the buck module 130 is connected to the micro inverter, and the input end of the buck module 130 is also connected to the output end of the buck-boost module 120. The buck module 130 is used to step down the voltage of the input end and output it; the control module 140 is respectively connected to the boost module 110, the buck-boost module 120 and the buck module 130, and the control module 140 is used to control the operation of the boost module 110, the buck-boost module 120 and the buck module 130.

[0035] Specifically, the photovoltaic panel receives sunlight and converts solar energy into electrical energy for output. The input end of the boost module 110 includes a first input port a and a second input port b, and the output end of the boost module 110 includes a first output port c and a second output port d. The first input port a of the boost module 110 is connected to the positive pole PV+ of the photovoltaic panel, and the second input port b of the boost module 110 is connected to the negative pole PV- of the photovoltaic panel. The boost module 110 boosts the voltage output by the photovoltaic panel and outputs it to the buck-boost module 120 or the buck module 130. The control module 140 is connected to the controlled end of the boost module 110, and the control signal sent by the control module 140 controls the boost module 110 to track the output power of the photovoltaic panel, so that the photovoltaic panel outputs at the maximum power to improve the energy conversion efficiency. The first input and output end of the buck-boost module includes a first input and output terminal port e and a second input and output terminal port f, and the second input and output end of the buck-boost module 120 includes a third input and output terminal port g and a fourth input and output terminal port h. The first input-output terminal port e of the buck-boost module 120 is connected to the first output port c of the boost module 110, the second input-output terminal port f of the buck-boost module 120 is connected to the second output port d of the boost module 110, the third input-output terminal port g of the buck-boost module 120 is connected to the positive electrode BAT+ of the energy storage module, and the fourth input-output terminal port h of the buck-boost module 120 is connected to the negative electrode BAT- of the energy storage module. The control module 140 is connected to the controlled end of the buck-boost module 120. The photovoltaic panel forms an electrical circuit with the energy storage module through the boost module 110 and the buck-boost module 120, so that when the control module 140 controls the boost module 110 and the buck-boost module 120 to work, the voltage output by the photovoltaic panel is boosted by the boost module 110 and then transmitted to the buck-boost module 120, and then the energy storage module is charged by the buck-boost module 120. The input end of the buck module 130 includes a first input port i and a second input port j, and the output end of the buck module 130 includes a first output port k and a second output port l. The first output port k of the buck module 130 is connected to the positive electrode OUT+ of the micro inverter, and the second output port l of the buck module 130 is connected to the negative electrode OUT- of the micro inverter. The first input port i of the buck module 130 is connected to the first output port c of the boost module 110, and the second input port j of the buck module 130 is connected to the second output port d of the boost module 110. The control module 140 is connected to the controlled end of the buck module 130. The photovoltaic panel forms an electrical circuit with the micro-inverter through the boost module 110 and the buck module 130, so that when the control module 140 controls the boost module 110 and the buck module 130 to work, the voltage output by the photovoltaic panel is boosted by the boost module 110 and then transmitted to the buck module 130, and then output to the micro-inverter through the buck processing of the buck module 130 to supply power to the load.In addition, the first input port i of the buck module 130 is also connected to the first input / output terminal port e of the buck-boost module 120, and the second input port j of the buck module 130 is also connected to the second input / output terminal port f of the buck-boost module 120. The energy storage module forms an electrical circuit with the micro-inverter through the buck-boost module 120 and the buck module 130, and the control signal sent by the control module 140 controls the buck module 130 to simulate the output power curve of the photovoltaic panel. Therefore, when the control module 140 controls the buck-boost module 120 and the buck module 130 to work, the voltage output by the energy storage module during discharge is output to the buck module 130 after being boosted by the buck-boost module 120, and then output to the micro-inverter through the buck processing of the buck module 130, so that the micro-inverter can work stably and maximize the use of the electric energy generated by the photovoltaic panel.

[0036] The power generation and energy storage circuit provided by the embodiment of the utility model connects the photovoltaic panel with the energy storage module through the boost module and the buck-boost module. When the boost module and the buck-boost module are controlled to work by the control module, the electric energy converted and output by the photovoltaic panel is stored in the energy storage module after being boosted by the boost module and bucked by the buck-boost module; the photovoltaic panel is connected with the micro inverter through the boost module and the buck module. When the boost module and the buck module are controlled to work by the control module, the electric energy converted and output by the photovoltaic panel is directly output to the micro inverter for powering the load after being boosted by the boost module and bucked by the buck module. The energy storage module is connected to the micro inverter through the buck-boost module and the buck module, and the buck module is controlled by the control module to simulate the output power curve of the photovoltaic panel, so that the electric energy stored in the energy storage module can be output to the micro inverter for powering the load after being boosted by the buck-boost module and bucked by the buck module, thereby improving the energy utilization efficiency of the photovoltaic panel and improving the economy of the power generation system.

[0037] Optionally, Figure 2 It is a structural diagram of another power generation and energy storage circuit provided according to an embodiment of the utility model. On the basis of the above embodiment, see Figure 2 The power generation and energy storage circuit further includes a voltage stabilizing module 150 , which is connected in parallel with the output end of the voltage boosting module 110 .

[0038] Specifically, the voltage stabilizing module 150 is connected in parallel between the first output port c of the boost module 110 and the second output port d of the boost module 110. The voltage stabilizing module 150 can stabilize the voltage between the first output port c and the second output port d. Thus, after the voltage emitted by the photovoltaic panel is boosted by the boost module 110, it is stabilized by the voltage stabilizing module 150 and then output to the buck-boost module 120, thereby improving the energy storage conversion efficiency; the voltage output when the energy storage module is discharged can also be boosted by the buck-boost module 120, and then stabilized by the voltage stabilizing module 150 and then output to the buck module 130, thereby improving the discharge efficiency of the energy storage module. In the embodiment of the utility model, the boost module 110 can adopt a Boost boost module or a Boost boost circuit, and the buck module 130 can adopt a Buck buck module or a Buck buck circuit; the buck-boost module 120 can adopt a module or circuit composed of Boost and Buck.

[0039] Optionally, Figure 3 It is a structural diagram of another power generation and energy storage circuit provided according to an embodiment of the utility model. On the basis of the above embodiment, see Figure 3 The boost module 110 includes: a first inductor L1, a first diode D1 and a first transistor Q1; the first end of the first inductor L1 is connected to the positive electrode PV+ of the photovoltaic panel, and the second end of the first inductor L1 is connected to the anode of the first diode D1; the cathode of the first diode D1 is connected to the boost-boost module 120 and the buck module 130 respectively; the first electrode of the first transistor Q1 is connected to the anode of the first diode D1, the second electrode of the first transistor Q1 is connected to the negative electrode PV- of the photovoltaic panel, and the gate of the first transistor Q1 is connected to the control module 140.

[0040] Specifically, the gate of the first transistor Q1 is connected to the control module 140. Exemplarily, Figure 3 It is shown in the figure that the first transistor Q1 is an N-type transistor. At this time, the first electrode of the first transistor Q1 is the source electrode, and the second electrode of the first transistor Q1 is the drain electrode. The source electrode of the first transistor Q1 is connected to the negative electrode PV- of the photovoltaic panel, and the drain electrode of the first transistor Q1 is connected to the anode electrode of the first diode D1, and is also connected to the second end of the first inductor L1. The first end of the first inductor L1 is connected to the positive electrode PV+ of the photovoltaic panel. The control signal sent by the control module 140 is transmitted to the gate electrode of the first transistor Q1 to control the on and off state of the first transistor Q1, thereby controlling the boost module 110 to boost the voltage output by the photovoltaic panel.

[0041] Optionally, based on the above embodiment, continue to refer to Figure 3The buck-boost module 120 includes: a second inductor L2, a second transistor Q2 and a third transistor Q3; the first end of the second inductor L2 is connected to the positive electrode BAT+ of the energy storage module, and the second end of the second inductor L2 is connected to the first electrode of the second transistor Q2; the second electrode of the second transistor Q2 is connected to the output end of the boost module 110, and the gate of the second transistor Q2 is connected to the control module 140; the first electrode of the third transistor Q3 is connected to the second end of the second inductor L2, and the second electrode of the third transistor Q3 is connected to the negative electrode BAT- of the energy storage module and the output end of the boost module 110.

[0042] Specifically, the gate of the second transistor Q2 and the gate of the third transistor Q3 are connected to the control module 140 respectively. Figure 3 It is shown that the second transistor Q2 and the third transistor Q3 are both N-type transistors. At this time, the first electrode of the second transistor Q2 is the source electrode, the second electrode of the second transistor Q2 is the drain electrode, the first electrode of the third transistor Q3 is the drain electrode, and the second electrode of the third transistor Q3 is the source electrode. The first end of the second inductor L2 is connected to the positive electrode BAT+ of the energy storage module, the second end of the second inductor L2 is connected to the source electrode of the second transistor Q2, and the drain electrode of the second transistor Q2 is connected to the cathode of the first diode D1. The drain electrode of the third transistor Q3 is connected to the second end of the second inductor L2 and the source electrode of the second transistor Q2, respectively, and the source electrode of the third transistor Q3 is connected to the negative electrode BAT- of the energy storage module and the source electrode of the first transistor Q1, respectively. The control signal sent by the control module 140 is transmitted to the gate electrode of the second transistor Q2 and the gate electrode of the third transistor Q3, and controls the on and off states of the second transistor Q2 and the third transistor Q3, thereby controlling the buck-boost module 120 to reduce the voltage when the energy storage module is charged and to increase the voltage when the energy storage module is discharged.

[0043] Optionally, based on the above embodiment, continue to refer to Figure 3 The buck module 130 includes: a fourth transistor Q4, a third inductor L3, a second diode D2 and a first capacitor C1; the first electrode of the fourth transistor Q4 is connected to the output end of the boost module 110, the second electrode of the fourth transistor Q4 is connected to the first end of the third inductor L3, and the gate of the fourth transistor Q4 is connected to the control module 140; the second end of the third inductor L3 is connected to the positive electrode OUT+ of the micro inverter; the cathode of the second diode D2 is connected to the second electrode of the fourth transistor Q4, and the anode of the second diode D2 is respectively connected to the output end of the boost module 110 and the negative electrode OUT- of the micro inverter; the first end of the first capacitor C1 is connected to the second end of the third inductor L3, and the second end of the first capacitor C1 is connected to the anode of the second diode D2.

[0044] Specifically, the gate of the fourth transistor Q4 is connected to the control module 140. Exemplarily, Figure 3It is shown that the fourth transistor Q4 is an N-type transistor. At this time, the first electrode of the fourth transistor Q4 is the drain, and the second electrode of the fourth transistor Q4 is the source. The drain of the fourth transistor Q4 is connected to the cathode of the first diode D1, and the drain of the fourth transistor Q4 is also connected to the drain of the second transistor Q2. The source of the fourth transistor Q4 is connected to the first end of the third inductor L3, and the second end of the third inductor L3 is connected to the positive electrode OUT+ of the micro inverter. The source of the fourth transistor Q4 is also connected to the cathode of the second diode D2, the anode of the second diode D2 is connected to the source of the first transistor Q1 and the source of the third transistor Q3, and the anode of the second diode D2 is connected to the negative electrode OUT- of the micro inverter. The first end of the first capacitor C1 is connected to the second end of the third inductor L3, and the second end of the first capacitor C1 is connected to the anode of the second diode D2. The control signal emitted by the control module 140 is transmitted to the gate of the fourth transistor Q4, controlling the on and off states of the fourth transistor Q4, thereby controlling the step-down module 130 to step down the voltage output by the photovoltaic panel or the voltage output by the energy storage module, and controlling the step-down module 130 to simulate the output power curve of the photovoltaic panel according to the control signal, thereby transmitting the voltage output by the energy storage module to the micro inverter.

[0045] Optionally, based on the above embodiment, continue to refer to Figure 3 The voltage stabilizing module 150 includes a second capacitor C2, a first end of the second capacitor C2 is connected to the cathode of the first diode D1, and a second end of the second capacitor C2 is connected to the second electrode of the first transistor Q1.

[0046] Specifically, the first end of the second capacitor C2 is connected to the cathode of the first diode D1, and the second end of the second capacitor C2 is connected to the source of the first transistor Q1. In addition, the first end of the second capacitor C2 is also connected to the drain of the second transistor Q2 and the drain of the fourth transistor Q4, and the second end of the second capacitor C2 is also connected to the source of the third transistor Q3 and the anode of the second diode D2. Therefore, after the voltage emitted by the photovoltaic panel is boosted by the boost module 110, it can be output to the buck-boost module 120 after being stabilized by the second capacitor C2; the voltage output when the energy storage module is discharged can also be boosted by the buck-boost module 120, and then output to the buck module 130 after being stabilized by the second capacitor C2.

[0047] Optionally, the control module 140 outputs a PWM signal to control the operation of the boost module 110 , the buck module 130 , the boost / boost module 120 , and the buck module 130 .

[0048] Specifically, the PWM signal output by the control module 140 controls the working state of the boost module 110 by controlling the on and off state of the first transistor Q1; the PWM signal output by the control module 140 controls the working state of the buck-boost module 120 by controlling the on and off state of the second transistor Q2 and the third transistor Q3; the PWM signal output by the control module 140 controls the working state of the buck module 130 by controlling the on and off state of the fourth transistor Q4. The control module 140 can have multiple working states when controlling different modules to work, including a charging priority mode, a load priority mode, and a discharging mode.

[0049] For example, Figure 4 This is a schematic diagram of energy flow in a power generation and energy storage circuit in a charging priority mode according to an embodiment of the utility model. Figure 4 In the charging priority mode, the energy generated by the photovoltaic panel is first used to charge the energy storage module through the boost module 110 and the buck module 120; the excess energy generated by the photovoltaic panel is transmitted to the micro inverter through the boost module 110 and the buck module 130 to supply electricity to the load. Figure 5 This is another schematic diagram of energy flow in a power generation and energy storage circuit in a charging priority mode according to an embodiment of the utility model. Figure 5 In the charging priority mode, all the energy generated by the photovoltaic panel is used to charge the energy storage module through the boosting of the boost module 110 and the bucking of the buck-boost module 120 .

[0050] Figure 6 This is a schematic diagram of energy flow in a power generation and energy storage circuit in a load priority mode according to an embodiment of the utility model, see Figure 6 In the load priority mode, the energy generated by the photovoltaic panel is preferentially transmitted to the micro-inverter through the boost module 110 and the buck module 130 to supply electricity to the load; when the micro-inverter reaches the rated working state, the excess energy generated by the photovoltaic panel is charged to the energy storage module through the boost module 110 and the buck module 120. Figure 7 This is another schematic diagram of energy flow in a load priority mode of a power generation and energy storage circuit provided according to an embodiment of the utility model, see Figure 7 In the load priority mode, all the energy generated by the photovoltaic panel is transmitted to the micro inverter through the boost module 110 and the buck module 130 to supply electricity to the load.

[0051] Figure 8 This is a schematic diagram of energy flow in a power generation and energy storage circuit in a discharge mode according to an embodiment of the utility model. Figure 8In the discharge mode, the electric energy stored in the energy storage module is transmitted to the micro inverter through the boost of the buck-boost module 120 and the buck of the buck module 130 to supply electricity to the load.

[0052] Fig. 9 This is a schematic diagram of a power generation and energy storage system structure provided according to an embodiment of the utility model. Fig. 9 The power generation and energy storage system includes a power generation and energy storage circuit, a photovoltaic panel 100 and a micro inverter 160. The energy storage module can be a battery 170. The electric energy converted by the photovoltaic panel can charge and store the battery 170 in the charging priority mode, so that the stored electric energy is output to the micro inverter to supply the load in the discharge mode. The power generation power of the photovoltaic panel is less than 2000W. Photovoltaic panels less than 2000W can be installed in the garden or balcony of ordinary household users.

[0053] The power generation and energy storage system provided in the embodiment of the utility model includes the power generation and energy storage circuit provided in any of the above embodiments, and has the beneficial effects of the power generation and energy storage circuit provided in any of the above embodiments, which will not be repeated here.

[0054] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0055] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A power generation and energy storage circuit, characterized in that: It includes a boost module, a buck-boost module, a buck module and a control module; the input end of the boost module is connected to the photovoltaic panel, and the output end of the boost module is respectively connected to the first input and output end of the buck-boost module and the input end of the buck module; the boost module is used to boost the input voltage and then output it; The second input-output terminal of the buck-boost module is connected to the energy storage module, and the buck-boost module is used to convert the voltage between the first input-output terminal and the second input-output terminal to charge and discharge the energy storage module; The output end of the step-down module is connected to the micro inverter, and the input end of the step-down module is also connected to the output end of the step-up / step-down module. The step-down module is used to step down the voltage at the input end and then output it; The control module is connected to the boost module, the buck-boost module and the buck module respectively, and is used to control the operation of the boost module, the buck-boost module and the buck module.

2. The power generation and energy storage circuit according to claim 1, characterized in that: It also includes a voltage stabilizing module, which is connected in parallel with the output end of the boosting module.

3. The power generation and energy storage circuit according to claim 2, characterized in that: The boost module includes: a first inductor, a first diode and a first transistor; The first end of the first inductor is connected to the positive electrode of the photovoltaic panel, and the second end of the first inductor is connected to the anode of the first diode; the cathode of the first diode is connected to the buck-boost module and the step-down module respectively; the first electrode of the first transistor is connected to the anode of the first diode, the second electrode of the first transistor is connected to the negative electrode of the photovoltaic panel, and the gate of the first transistor is connected to the control module.

4. The power generation and energy storage circuit according to claim 1, characterized in that: The buck-boost module includes: a second inductor, a second transistor and a third transistor; The first end of the second inductor is connected to the positive electrode of the energy storage module, and the second end of the second inductor is connected to the first electrode of the second transistor; the second electrode of the second transistor is connected to the output end of the boost module, and the gate of the second transistor is connected to the control module; the first electrode of the third transistor is connected to the second end of the second inductor, and the second electrode of the third transistor is connected to the negative electrode of the energy storage module and the output end of the boost module.

5. The power generation and energy storage circuit according to claim 1, characterized in that: The step-down module includes: a fourth transistor, a third inductor, a second diode and a first capacitor; The first electrode of the fourth transistor is connected to the output end of the boost module, the second electrode of the fourth transistor is connected to the first end of the third inductor, and the gate of the fourth transistor is connected to the control module; the second end of the third inductor is connected to the positive electrode of the micro inverter; the cathode of the second diode is connected to the second electrode of the fourth transistor, and the anodes of the two diodes are respectively connected to the output end of the boost module and the negative electrode of the micro inverter; the first end of the first capacitor is connected to the second end of the third inductor, and the second end of the first capacitor is connected to the anode of the second diode.

6. The power generation and energy storage circuit according to claim 3, characterized in that: The voltage stabilizing module includes a second capacitor, a first end of the second capacitor is connected to the cathode of the first diode, and a second end of the second capacitor is connected to the second electrode of the first transistor.

7. The power generation and energy storage circuit according to claim 1, characterized in that: The control module outputs a PWM signal to control the operation of the boost module, the buck-boost module and the buck module.

8. A power generation and energy storage system, characterized in that: It comprises the power generation and energy storage circuit, photovoltaic panel and micro inverter as described in any one of claims 1 to 7.

9. The power generation and energy storage system according to claim 8, characterized in that: The energy storage module includes a battery.

10. The power generation and energy storage system according to claim 8, characterized in that: The power generation power of the photovoltaic panel is less than 2000W.

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