Light energy conversion energy storage system

Abstract

The invention, which belongs to the field of the new energy storage system, discloses a light energy conversion energy storage system comprising a photovoltaic array, a power converter, an energy management unit and an energy storage unit. The photovoltaic array obtains solar radiation energy, and generated direct-current electric energy is modulated through the power converter; the energy management unit determines a charging and discharging strategy of the energy storage unit according to the direct-current electric energy generated by the photovoltaic array and the charge state of the energy storage unit, or directly outputs the direct-current electric energy to a load; the energy storage unit is configured to receive the modulated electric energy when the charge state of the energy storage unit does not meet the power demand of the load, and the energy management unit determines a charging and discharging strategy according to the direct current electric energy generated by the photovoltaic array and the charge state of the energy storage unit, thereby achieving the effective management and distribution of the electric energy, improving the overall efficiency of the system, and reducing the power consumption of the system. And the system can select to directly supply power to the load or store the power in the energy storage unit according to actual conditions, so that the flexibility and adaptability of the system are enhanced.

Description

Technical Field

[0001] The present invention belongs to the field of new energy storage systems, and in particular, relates to a light energy conversion storage system. Background Art

[0002] With the rapid development of the global economy and the continuous increase in population, the demand for energy continues to grow. Although traditional fossil energy (such as coal, oil and natural gas) can meet most of the energy needs in the short term, the environmental pollution and greenhouse gas emissions generated during their mining and use are becoming increasingly serious, which has a negative impact on global climate change. Therefore, the development and utilization of clean and renewable energy resources has become a consensus and trend of the international community.

[0003] As a clean, renewable energy resource, solar energy has significant advantages. Most areas on Earth have sufficient sunshine conditions, especially near the equator and in desert areas. With the advancement of technology and large-scale production, the cost of solar photovoltaic modules has dropped significantly, making solar power generation more economical and feasible.

[0004] Although there are some solar photovoltaic systems and energy storage systems on the market, these systems generally have the following problems: First, the conversion efficiency is low. The conversion efficiency of traditional photovoltaic panels is low, resulting in low utilization of solar energy, especially under poor lighting conditions. Second, the energy storage effect is poor. Existing energy storage units often have problems with low energy density and short cycle life, and cannot effectively meet long-term, high-load electricity demand. Third, management is extensive. Most systems lack intelligent energy management mechanisms and cannot perform refined management based on actual electricity demand and energy storage status, resulting in energy waste. Fourth, poor adaptability. Existing systems often perform poorly when faced with different climatic conditions and application scenarios, making it difficult to meet diverse user needs.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a light energy conversion energy storage system. The present invention is achieved through the following technical solutions:

[0007] A light energy conversion and energy storage system comprises a photovoltaic array, a power converter, an energy management unit and an energy storage unit; the photovoltaic array obtains solar radiation energy, and the generated DC power is modulated by the power converter; the energy management unit determines the charging and discharging strategy of the energy storage unit according to the DC power generated by the photovoltaic array and the charge state of the energy storage unit, or directly outputs the DC power to the load; the energy storage unit is configured to receive the modulated power when its own charge state does not meet the power demand of the load, and output the modulated power when its own charge state meets the power demand of the load.

[0008] Furthermore, it also includes a monitoring unit, which is configured to monitor the charge state of the energy storage unit and provide real-time information of the charge state to the energy management unit.

[0009] Furthermore, the modulated electric energy includes modulated direct current, and the voltage outputted by the direct current electric energy generated by the photovoltaic array after passing through the power converter is greater than the working voltage of the load and less than the charging voltage of the energy storage unit.

[0010] Furthermore, the photovoltaic array adopts a tracking photovoltaic array to improve the photoelectric conversion efficiency.

[0011] Furthermore, the photovoltaic array is configured with a solar tracking system through a transmission structure, and the solar tracking system is configured to be driven by a driving mechanism to track the trajectory of the sun; the driving mechanism includes a stepper motor and a driving system, and the stepper motor drives the driving system to drive the transmission structure to achieve tracking of the trajectory of the sun.

[0012] Furthermore, a communication device is configured for remote control, and the communication device is configured to receive remote data of the light energy conversion energy storage system, wherein the remote data includes the charge state of the energy storage unit, and transmit the received remote data to the remote control terminal; after acquiring the remote data, the remote control terminal analyzes the lighting conditions, generates a driving instruction, and transmits the driving instruction to the communication device; the driving instruction includes the operating azimuth angle θ, elevation angle ω, and tracking speed V of the driving mechanism, and the driving mechanism adjusts the azimuth angle θ and elevation angle ω of the photovoltaic array according to the driving instruction, so that the photovoltaic array points to the sun's trajectory.

[0013] Furthermore, the photovoltaic array is configured as a number of photovoltaic sub-arrays, the power converters are configured as a number, the number of photovoltaic sub-arrays are connected to a number of power converters, the number of power converters are electrically connected to the energy management unit, the number of photovoltaic sub-arrays are arranged parallel to each other and equidistantly, the number of power converters correspond one-to-one to the number of photovoltaic sub-arrays, and the outputs of the number of photovoltaic sub-arrays are connected to the charging point of the distribution network.

[0014] Furthermore, the power converter is configured to have a boost conversion unit, which is controlled by voltage, and the voltage includes the voltage of the DC power generated by the photovoltaic array, the charge state of the energy storage unit, the charging voltage of the load, and the voltage of the power system; the boost conversion unit is configured to start when the voltage of the DC power generated by the photovoltaic array is lower than the voltage of the power system, and boost the voltage of the DC power generated by the photovoltaic array to the voltage of the power system; the boost includes boosting the voltage of the DC power generated by the photovoltaic array to the voltage of the power system; the boost also includes boosting the voltage of the DC power generated by the photovoltaic array to the charging voltage of the energy storage unit.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The energy management unit determines the charging and discharging strategy based on the DC power generated by the photovoltaic array and the charge state of the energy storage unit, thereby achieving effective management and distribution of electric energy and improving the overall efficiency of the system. The system can also choose to directly supply power to the load or store it in the energy storage unit first according to actual conditions, thereby enhancing the flexibility and adaptability of the system. Regardless of whether there is light or not, the system can provide stable power output through the energy storage unit, ensuring the continuity and reliability of power consumption.

[0017] 2. The monitoring unit monitors the charge state of the energy storage unit in real time and provides feedback information to the energy management unit, ensuring accurate control of the charging and discharging process and avoiding overcharging or over-discharging. Through accurate charge state management, the service life of the energy storage unit can be effectively extended and the maintenance cost of the system can be reduced.

[0018] 3. By adopting tracking photovoltaic arrays, we can capture sunlight to the maximum extent, improve the efficiency of photoelectric conversion, and thus increase the power generation of the system. Tracking photovoltaic arrays can dynamically adjust the angle according to the position of the sun, adapt to different climates and geographical conditions, and enhance the adaptability and flexibility of the system. DETAILED DESCRIPTION

[0019] The present invention is further described below.

[0020] The present embodiment provides a light energy conversion energy storage system, including a photovoltaic array, a power converter, an energy management unit, and an energy storage unit; the photovoltaic array obtains solar radiation energy, and the generated DC power is modulated by the power converter; the energy management unit determines the charging and discharging strategy of the energy storage unit according to the DC power generated by the photovoltaic array and the charge state of the energy storage unit, or directly outputs the DC power to the load; the energy storage unit is configured to receive the modulated power when its own charge state does not meet the power demand of the load, and output the modulated power when its own charge state meets the power demand of the load.

[0021] The monitoring unit is configured to monitor the charge state of the energy storage unit and provide real-time information of the charge state to the energy management unit.

[0022] The modulated electric energy includes modulated direct current, and the voltage outputted by the direct current electric energy generated by the photovoltaic array after passing through the power converter is greater than the working voltage of the load and less than the charging voltage of the energy storage unit.

[0023] The photovoltaic array adopts a tracking photovoltaic array to improve the photoelectric conversion efficiency.

[0024] The photovoltaic array is configured with a solar tracking system through a transmission structure, and the solar tracking system is configured to be driven by a driving mechanism to track the trajectory of the sun; the driving mechanism includes a stepper motor and a driving system, and the stepper motor drives the driving system to drive the transmission structure to achieve tracking of the trajectory of the sun.

[0025] A communication device is configured for remote control, and the communication device is configured to receive remote data of the light energy conversion energy storage system, wherein the remote data includes the charge state of the energy storage unit, and transmit the received remote data to the remote control terminal; after acquiring the remote data, the remote control terminal analyzes the lighting conditions, generates a driving instruction, and transmits the driving instruction to the communication device; the driving instruction includes the operating azimuth angle θ, elevation angle ω, and tracking speed V of the driving mechanism, and the driving mechanism adjusts the azimuth angle θ and elevation angle ω of the photovoltaic array according to the driving instruction, so that the photovoltaic array points to the sun's trajectory.

[0026] The photovoltaic array is configured as a plurality of photovoltaic sub-arrays, the power converters are configured as a plurality of photovoltaic sub-arrays, the plurality of photovoltaic sub-arrays are connected to a plurality of power converters, the plurality of power converters are electrically connected to an energy management unit, the plurality of photovoltaic sub-arrays are arranged in parallel and equidistantly, the plurality of power converters correspond one to one with the plurality of photovoltaic sub-arrays, and the outputs of the plurality of photovoltaic sub-arrays are connected to a charging point of a power distribution network.

[0027] The power converter is configured to have a boost conversion unit, which is controlled by voltage, and the voltage includes the voltage of the DC power generated by the photovoltaic array, the charge state of the energy storage unit, the charging voltage of the load, and the voltage of the power system; the boost conversion unit is configured to start when the voltage of the DC power generated by the photovoltaic array is lower than the voltage of the power system, and boost the voltage of the DC power generated by the photovoltaic array to the voltage of the power system; the boost includes boosting the voltage of the DC power generated by the photovoltaic array to the voltage of the power system; the boost also includes boosting the voltage of the DC power generated by the photovoltaic array to the charging voltage of the energy storage unit.

[0028] Furthermore, the implementation method of the light energy conversion energy storage system of this embodiment includes the following steps:

[0029] Monitor the charge state of the energy storage unit and analyze the lighting conditions, the DC power generated by the photovoltaic array and the charge state of the energy storage unit. The energy management unit determines the charging and discharging strategy of the energy storage unit based on the DC power generated by the photovoltaic array and the charge state of the energy storage unit to achieve energy storage or direct power supply of the DC power.

[0030] A communication device is configured for remote control, and the communication device is configured to receive remote data of the light energy conversion energy storage system, wherein the remote data includes the charge state of the energy storage unit, the sun's position and the sun's light intensity, and transmits the received remote data to the remote control terminal; after acquiring the remote data, the remote control terminal analyzes the lighting conditions, generates a drive instruction, and transmits the drive instruction to the communication device; the drive instruction includes the operating azimuth angle θ, the operating speed V and the operating condition of the stepper motor, and the stepper motor drives the drive system to drive the transmission structure to achieve tracking of the sun's trajectory.

[0031] Furthermore, the transmission structure of the present embodiment includes a plurality of driven wheels, a plurality of fixed legs, a transmission belt, a driving wheel, and a stepper motor, the rotating shafts of the plurality of driven wheels are hinged to the corresponding plurality of fixed legs and synchronously connected to the driving wheel; a plurality of transmission belts are provided, and the plurality of transmission belts are wound around the driving wheel and the driven wheel to form a plurality of conveyor belts, the plurality of conveyor belts move synchronously, and a plurality of photovoltaic sub-arrays are fixedly connected to the plurality of conveyor belts, and the plurality of photovoltaic sub-arrays are parallel and equidistant; the driving wheel rotates at a set angle under the drive of the stepper motor, driving the transmission belt to rotate, and the plurality of driven wheels of the fixed transmission belt follow the driving wheel to rotate at a set angle; the stepper motor drives the driving wheel to operate, and the driving wheel operates at an operating speed V according to the operating azimuth angle θ preset by the driving instruction; the rotation of the transmission belt realizes the adjustment of the operating angle of the solar tracking system, and the operating angle includes the azimuth angle θ and the elevation angle ω.

[0032] Preferably, the photovoltaic array includes several photovoltaic sub-arrays, several transmission wires, several photovoltaic controllers, and several power converters. The several photovoltaic sub-arrays are distributed in parallel and equidistantly, each photovoltaic sub-array is connected in series with the corresponding several photovoltaic panels to form a group of photovoltaics, and several photovoltaic groups are connected in parallel. The lead wires at both ends of each photovoltaic group are connected to the photovoltaic controller, and several photovoltaic controllers are connected in parallel; several photovoltaic controllers are connected to several power converters, and several power adapters correspond to several photovoltaic controllers one by one, and several power adapters are electrically connected respectively; each photovoltaic sub-array is electrically connected to the lead wires of several photovoltaic panels to form a group of photovoltaics, and the light energy conversion and energy storage system is configured with several photovoltaic groups, several photovoltaic groups are connected in parallel, and several photovoltaic groups are electrically connected respectively.

[0033] Preferably, the photovoltaic array, power converter, energy management unit, energy storage unit, monitoring unit, and communication device are all connected to the data acquisition device, and the data acquisition device is connected to the remote control unit.

[0034] Preferably, several power converters have the same structure but different functions, and are configured with the same electrical parameters. Several power converters all include a boost device, a power electronic device, and an energy storage control module. The DC power generated by the photovoltaic panel is respectively connected to several photovoltaic controllers through several power converters. The boost device includes several boost elements, several boost elements are connected in parallel, several boost elements correspond one-to-one to several power electronic devices, several power electronic devices are configured to have a synchronization function, several power electronic devices correspond one-to-one to photovoltaic controllers, and several power electronic devices are electrically connected to several photovoltaic controllers. The boost control modules are electrically connected to several boost elements respectively. The energy storage control module is electrically connected to the energy storage unit, the energy storage control module configures power conversion parameters, and adjusts the boost elements through several power electronic devices to perform voltage regulation.

[0035] Preferably, the boost element comprises a driving element, a switching element, an energy storage unit and a diode. The driving element and the switching element are connected in parallel, and the triggering end of the switching element is connected to the energy storage unit; the diode is connected between the triggering ends of the switching element.

[0036] Preferably, the DC power generated by the photovoltaic array is connected to the photovoltaic controller, the photovoltaic controller is configured with a switching circuit, the switching circuit is configured with a monitoring unit, a control unit, a first switch circuit, and a second switch circuit, the monitoring unit is configured to collect the voltage of the DC power and the charge state of the energy storage unit, the monitoring unit is connected to the control unit, the control unit is electrically connected to the first switch circuit and the second switch circuit respectively; the first switch circuit and the second switch circuit are both electrically connected to the energy storage unit; the monitoring unit monitors the voltage of the DC power and the charge state of the energy storage unit and sends instructions to the first switch circuit and the second switch circuit through the control unit; the energy storage unit is configured with an electric control door, the electric control door is connected to the first switch circuit and the second switch circuit; the first switch circuit and the second switch circuit are configured with a plurality of switches, in the first switch circuit, at least one switch is turned on, and in the second switch circuit, at least one switch is turned off, so that the voltage of the DC power flows between the energy storage unit or the photovoltaic array and the energy storage unit.

[0037] Through the above design, the trigger end of the switch element 1 is controlled by the driving control circuit. At this time, one end of the switch element 1 that is turned on is electrically connected to the photovoltaic controller, and the other end is electrically connected to the driving element. When the switch element 1 is turned on, an induced current is generated, and the diode D is turned on to supply power to the driving element. The driving element is configured as a boost device and can generate an electromotive force. The electromotive force generated by the driving element passes through the first switch circuit, the second switch circuit, and the energy storage element. The energy storage element supplies power to the boost device, which can achieve boosting.

[0038] The energy storage module monitors the charge state information of the energy storage unit through the monitoring unit, and the electric energy generated by the photovoltaic panel is transmitted to the photovoltaic controller. The photovoltaic controller is configured to supply power to the energy storage module through the first switching circuit and the second switching circuit.

[0039] The photovoltaic array of the present invention adopts a tracking photovoltaic array, for example, a solar tracking system is configured through a transmission structure.

[0040] For example, the driving mechanism includes a stepper motor and a driving system, and the stepper motor and the driving system, the transmission mechanism and the driving system are all configured to have a gear set, the stepper motor output shaft is connected to the gear, the gear engages the gear set, and the gear set drives the transmission mechanism. For example, the gear set includes a driving wheel, a driven wheel, and a synchronous belt (or chain), which can achieve synchronous operation.

[0041] The transmission structure also includes a plurality of driven wheels, a plurality of fixed legs, a transmission belt, a driving wheel, and a stepper motor. The rotating shafts of the plurality of driven wheels are hinged to the corresponding plurality of fixed legs and are synchronously connected to the driving wheel. A plurality of transmission belts are provided, and the plurality of transmission belts are wound around the driving wheel and the driven wheel to form a plurality of conveyor belts. The plurality of conveyor belts move synchronously, and a plurality of photovoltaic sub-arrays are fixedly connected to the plurality of conveyor belts. The plurality of photovoltaic sub-arrays are parallel and equidistantly positioned.

[0042] The driving wheel rotates at a set angle under the drive of the stepper motor, driving the transmission belt to rotate, and a plurality of driven wheels that fix the transmission belt follow the driving wheel to rotate at the set angle.

[0043] The stepper motor drives the driving wheel to rotate at a rotational angle θ preset by the driving instruction and at a rotational speed V.

[0044] The rotation of the transmission belt can adjust the operating angle of the solar tracking system, and the operating angle includes an azimuth angle θ and an elevation angle ω.

[0045] The above description is a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A light energy conversion energy storage system, characterized in that: Including photovoltaic array, power converter, energy management unit, energy storage unit; The photovoltaic array captures solar radiation energy, and the generated DC power is modulated by a power converter; The energy management unit determines the charging and discharging strategy of the energy storage unit or directly outputs the DC power to the load according to the DC power generated by the photovoltaic array and the charge state of the energy storage unit; The energy storage unit is configured to receive modulated electric energy when its own state of charge does not meet the power demand of the load, and output the modulated electric energy when its own state of charge meets the power demand of the load.

2. A light energy conversion energy storage system according to claim 1, characterized in that: It also includes a monitoring unit, which is configured to monitor the charge state of the energy storage unit and provide real-time information of the charge state to the energy management unit.

3. A light energy conversion energy storage system according to claim 1, characterized in that: The modulated electric energy includes modulated direct current, and the voltage outputted by the direct current electric energy generated by the photovoltaic array after passing through the power converter is greater than the working voltage of the load and less than the charging voltage of the energy storage unit.

4. The light energy conversion energy storage system according to claim 1, characterized in that: The photovoltaic array adopts a tracking photovoltaic array to improve the photoelectric conversion efficiency.

5. A light energy conversion energy storage system according to claim 4, characterized in that: The photovoltaic array is configured with a solar tracking system through a transmission structure, and the solar tracking system is configured to be driven by a driving mechanism to track the trajectory of the sun; The driving mechanism comprises a stepping motor and a driving system. The stepping motor drives the driving system to drive the transmission structure to track the trajectory of the sun.

6. A light energy conversion energy storage system according to any one of claims 1 to 5, characterized in that: Configuring a communication device for remote control, the communication device being configured to receive remote data of the light energy conversion energy storage system, the remote data including the charge state of the energy storage unit, and transmitting the received remote data to a remote control terminal; After acquiring the remote data, the remote control terminal analyzes the lighting conditions, generates a driving instruction, and transmits the driving instruction to the communication device; The driving instruction includes the operating azimuth angle θ, elevation angle ω, and tracking speed V of the driving mechanism. The driving mechanism adjusts the azimuth angle θ and elevation angle ω of the photovoltaic array according to the driving instruction so that the photovoltaic array points to the sun's trajectory.

7. A light energy conversion energy storage system according to any one of claims 1 to 5, characterized in that: The photovoltaic array is configured as a plurality of photovoltaic sub-arrays, the power converters are configured as a plurality of photovoltaic sub-arrays, the plurality of photovoltaic sub-arrays are connected to a plurality of power converters, the plurality of power converters are electrically connected to an energy management unit, the plurality of photovoltaic sub-arrays are arranged in parallel and equidistantly, the plurality of power converters correspond one to one with the plurality of photovoltaic sub-arrays, and the outputs of the plurality of photovoltaic sub-arrays are connected to a charging point of a power distribution network.

8. A light energy conversion and energy storage system according to any one of claims 1 to 5, characterized in that: The power converter is configured to have a boost conversion unit, and the boost conversion unit is controlled by voltage, and the voltage includes the voltage of the DC power generated by the photovoltaic array, the charge state of the energy storage unit, the charging voltage of the load, and the voltage of the power system; The boost conversion unit is configured to start when the voltage of the DC power generated by the photovoltaic array is lower than the voltage of the power system, and boost the voltage of the DC power generated by the photovoltaic array to the voltage of the power system; The voltage boosting includes boosting the voltage of the DC power generated by the photovoltaic array to the voltage of the power system; The voltage boosting also includes boosting the voltage of the DC power generated by the photovoltaic array to the charging voltage of the energy storage unit.