Energy storage power generation device and energy storage power generation method

Abstract

The invention belongs to the technical field of power generation, and provides an energy storage power generation device and a power generation method.The device comprises a power generator and further comprises a driving mechanism for driving the power generator and an energy supply mechanism for providing energy for the driving mechanism; the driving mechanism comprises a starting motor and an accelerating motor which are in transmission connection with the generator; the energy supply mechanism comprises a first battery pack and a second battery pack, the first battery pack is electrically connected with the starting motor, the second battery pack is electrically connected with the accelerating motor, the first output end of the generator is electrically connected with the first battery pack and the second battery pack, and the second output end of the generator is electrically connected with the load. The first battery pack and the second battery pack are charged during power generation; the starting motor drives the generator to generate electricity, one part of electricity generated by the generator charges the first battery pack and the second battery pack, and the other part of electricity provides electric energy for the load; when the direct output voltage of the generator reaches a certain range, the acceleration motor is switched in and drives the generator to generate power together with the starting motor.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and in particular to an energy storage power generation device and an energy storage power generation method. Background Art

[0002] The amount of electricity consumed at different times of the day is different. The electricity consumption during peak hours is called the peak value, and the electricity consumption during low hours is called the valley value. Since the configuration of the power generation and transmission equipment of the power supply system is configured according to the peak power demand. During the low power consumption period in the actual operation of the power supply system, there will be a large amount of surplus production capacity. At present, electricity cannot be stored in time, and large-scale power generation equipment cannot adjust production capacity in time, which results in a huge waste of production capacity. In order to balance the electricity demand at different times, electricity pricing implements different pricing methods for different time periods. Through the role of price leverage, the electricity structure is adjusted so that some electricity users can reduce electricity consumption during peak hours and increase electricity consumption during low hours, so as to achieve peak shaving and valley filling, narrow the gap between power supply peak and valley values, improve the operating efficiency of the power supply system, reduce costs, and reduce waste of production capacity.

[0003] General energy storage generators use low-cost electricity during off-peak hours to convert it into compressed air's compression potential energy or liquid's gravitational potential energy to achieve energy storage, and then convert the stored energy back into electrical energy during peak hours, which can improve energy utilization and reduce capacity waste. However, this type of gas or liquid phase energy storage generator requires a large amount of energy storage space, and gravity potential energy conversion type energy storage generators have rigid requirements for site height differences, and are not universal.

[0004] The technical problem to be solved by this application is: how to solve the problem that the existing energy storage power generation device has high site requirements and is not universal. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide an energy storage power generation device and an energy storage power generation method, which have the characteristics of simple and compact structure, low site requirements and good versatility.

[0006] The technical solution adopted by the present invention is: an energy storage power generation device, including a generator, a driving mechanism for driving the generator and an energy supply mechanism for providing energy to the driving mechanism;

[0007] The driving mechanism includes a starting motor and an accelerating motor, and both the starting motor and the accelerating motor are drivingly connected to the generator;

[0008] The energy supply mechanism includes a first battery group and a second battery group, the first battery group is electrically connected to the starting motor, the second battery group is electrically connected to the acceleration motor, the first output end of the generator is electrically connected to the first battery group and the second battery assembly, and the second output end of the generator is electrically connected to the load.

[0009] The energy storage power generation device of the present application sets the first battery pack and the second battery pack. During the low electricity consumption period, the power grid is used to charge the first battery pack and the second battery pack. When it is the high electricity consumption period, the first battery pack and the second battery pack are respectively used to supply power to the starting motor and the accelerating motor. The starting motor is preferably a low-speed and high-torque motor, which uses large torque to drive the generator to start. When the speed of the generator reaches the preset range, the high-speed accelerating motor then cuts in and drives the generator to generate electricity together with the starting motor, driving the speed of the generator to the preset speed within a short time, so that the generator can directly output a voltage value within the preset range. The electricity generated by the motor is preferentially supplied to the load. When the electricity consumption of the load is not much, the generator also charges the first battery pack and the second battery pack in a feedback manner, which can make full use of electric energy and reduce production waste. This power generation device uses battery packs for energy storage, which can reduce the space required for energy storage, has lower requirements for the site, better versatility, and higher safety performance.

[0010] In some embodiments, the drive mechanism further includes a speed stabilizing motor. The accelerating motor is a double-headed motor. The first output shaft of the accelerating motor is coaxially connected to the input shaft of the generator, the second output shaft of the accelerating motor is coaxially connected to the output shaft of the speed stabilizing motor, the speed stabilizing motor is electrically connected to the mains power, the starting motor is arranged on one side of the generator, and the output shaft of the starting motor is connected to the input shaft of the generator through a transmission member.

[0011] Adopting the above technical solution, when the speed of the generator reaches a certain range, the speed stabilizing motor then cuts in and drives the generator to generate electricity together with the starting motor and the accelerating motor, which can stabilize the speed of the generator within a certain range. Moreover, since the speed stabilizing motor is powered by the mains power, it can realize long-term stable power generation of the generator. And because the first battery pack and the second battery pack supply power to the starting motor and the accelerating motor respectively, it saves more power consumption required by the speed stabilizing motor compared with being powered solely by the mains power; the output shaft of the accelerating motor and the output shaft of the speed stabilizing motor are directly connected to the input shaft of the generator, which can improve the transmission efficiency and reduce energy loss.

[0012] In some embodiments, the output shaft of the accelerating motor is connected to the input shaft of the generator through a connecting shaft, and the output shaft of the starting motor is connected to the connecting shaft through a transmission member.

[0013] In some embodiments, the transmission member is a belt and a pulley. The pulley is sleeved on the connecting shaft, and the output shaft of the starting motor is connected to the pulley through a belt.

[0014] Adopting the above technical solution, the starting motor uses the large-diameter output to drive the small-diameter rotation of the connecting shaft, which can provide greater torque to facilitate the starting motor to drive the generator to start.

[0015] In some embodiments, a counterweight wheel is further included. The counterweight wheel is disposed between the generator and the acceleration motor, and both ends of the counterweight wheel are respectively connected to the input shaft of the generator and the output shaft of the acceleration motor.

[0016] With the above technical solution, the counterweight wheel plays a role in buffering and energy storage, enabling the generator to operate more smoothly.

[0017] In some embodiments, a distribution box and a transformer box are further included. The distribution box is electrically connected to the generator, the driving mechanism, and the energy supply mechanism. The input end of the transformer box is electrically connected to the generator, and the output end of the transformer box is electrically connected to the first battery pack, the second battery assembly, and the load.

[0018] With the above technical solution, the distribution box is used to control the coordinated operation of the generator, the driving mechanism, and the energy supply mechanism, and the transformer box is used to adjust the voltage directly output by the generator to the required voltage value range to facilitate the connection of the load and the first battery pack and the second battery pack.

[0019] In some embodiments, a frame is further included. The generator, the driving mechanism, the energy supply mechanism, the distribution box, and the transformer box are all installed on the frame.

[0020] With the above technical solution, installing the generator, the driving mechanism, the energy supply mechanism, the distribution box, and the transformer box on the frame can make the entire power generation device form a whole, facilitating transfer and transportation.

[0021] In some embodiments, the load is an electrical appliance or an energy storage cabinet.

[0022] With the above technical solution, the load can be a direct electrical appliance, or an energy storage cabinet that stores the electric energy generated by the generator.

[0023] An energy storage power generation method uses the energy storage power generation device of any of the above to generate power, including the following steps:

[0024] Before power generation, the first battery pack and the second battery pack are charged first;

[0025] The first battery pack provides electrical energy for the starting motor, the driving motor drives the generator to start generating power, a part of the electrical energy generated by the generator is returned to charge the first battery pack and the second battery pack, and the other part of the electrical energy provides electrical energy for the load;

[0026] When the direct output voltage of the generator reaches the first preset voltage threshold, the second battery pack provides electrical energy for the acceleration motor, and the acceleration motor cuts in and jointly drives the generator to generate power with the starting motor.

[0027] By adopting the above technical solution, the driving generator can be better driven by starting the motor and accelerating the motor to access step by step, and the generator can output the required voltage faster. Moreover, since the starting motor and the accelerating motor jointly bear the power source of the generator, the loads on the starting motor and the accelerating motor can be reduced, which is beneficial to reducing the power consumption and improving the energy utilization rate.

[0028] In some embodiments, a speed stabilizing motor is further included, and the following steps are further included:

[0029] When the direct output voltage of the generator reaches the second preset voltage threshold, the commercial power provides electrical energy for the speed stabilizing motor, and the speed stabilizing motor cuts in and jointly drives the generator to generate electricity with the starting motor and the accelerating motor, so that the direct output voltage of the generator is stabilized at the third preset threshold.

[0030] By adopting the above technical solution, the generator can operate continuously and stably by adding a speed stabilizing motor, and the energy consumption of the speed stabilizing motor can be reduced, making it more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of an energy storage power generation device according to a preferred embodiment of the present invention;

[0032] Figure 2 is Figure 1 a schematic structural diagram of another perspective of the energy storage power generation device shown.

[0033] In the figure: 100, energy storage power generation device; 10, generator; 20, driving mechanism; 21, starting motor; 22, accelerating motor; 23, speed stabilizing motor; 24, connecting shaft; 25, belt; 26, belt pulley; 30, energy supply mechanism; 31, battery box; 40, counterweight wheel; 50, distribution box; 60, transformer box; 70, frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. When the number of an element is referred to as "a plurality", it can be any number of two or more. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] Please refer to Figure 1 and Figure 2 , which is an energy storage power generation device according to a preferred embodiment of the present invention, including a generator 10, and further including a driving mechanism 20 for driving the generator 10 and an energy supply mechanism 30 for supplying energy to the driving mechanism 20;

[0038] The driving mechanism 20 includes a starting motor 21 and an accelerating motor 22, and both the starting motor 21 and the accelerating motor 22 are drivingly connected to the generator 10;

[0039] The energy supply mechanism 30 includes a first battery pack and a second battery pack. The first battery pack is electrically connected to the starting motor 21, the second battery pack is electrically connected to the accelerating motor 22, the first output end of the generator 10 is electrically connected to the first battery pack and the second battery assembly, and the second output end of the generator 10 is electrically connected to the load.

[0040] The energy storage power generation device of the present application sets the first battery pack and the second battery pack. During the low electricity consumption period, the power grid is used to charge the first battery pack and the second battery pack. When it is the high electricity consumption period, the first battery pack and the second battery pack are used to supply power to the starting motor 21 and the accelerating motor 22 respectively. The starting motor 21 is preferably a low-speed high-torque motor, which uses large torque to drive the generator 10 to start. When the speed of the generator 10 reaches the preset range, the high-speed accelerating motor 22 then cuts in and drives the generator 10 to generate electricity together with the starting motor 21, driving the speed of the generator 10 to the preset speed within a short time, so that the generator 10 can directly output the voltage value within the preset range. The electricity generated by the motor is preferentially supplied to the load. When the electricity consumption of the load is not much, the generator 10 simultaneously charges the first battery pack and the second battery pack by feedback, which can make full use of electric energy and reduce production waste. This power generation device uses battery packs for energy storage, which can reduce the space required for energy storage, has lower requirements for the site, better versatility, and higher safety performance.

[0041] Preferably, in order to improve safety, the first battery pack and the second battery pack are installed in the battery box 31, and the battery box 31 is arranged on one side of the starting motor 21.

[0042] As Figure 2 shown, in an embodiment, the drive mechanism 20 further includes a speed stabilizing motor 23. The accelerating motor 22 is a double-headed motor. The first output shaft of the accelerating motor 22 is coaxially connected to the input shaft of the generator 10, and the second output shaft of the accelerating motor 22 is coaxially connected to the output shaft of the speed stabilizing motor 23. The speed stabilizing motor 23 is electrically connected to the commercial power. The starting motor 21 is arranged on one side of the generator 10, and the output shaft of the starting motor 21 is connected to the input shaft of the generator 10 through a transmission member. When the speed of the generator 10 reaches a certain range, the speed stabilizing motor 23 then cuts in and drives the generator 10 to generate electricity together with the starting motor 21 and the accelerating motor 22, which can stabilize the speed of the generator 10 within a certain range. Moreover, since the speed stabilizing motor 23 is powered by commercial power, it can realize long-term stable power generation of the generator 10. And since the first battery pack and the second battery pack supply power to the starting motor 21 and the accelerating motor 22 respectively, it saves the power consumption required for the speed stabilizing motor 23 compared with being powered solely by commercial power; the output shaft of the accelerating motor 22 and the output shaft of the speed stabilizing motor 23 are directly connected to the input shaft of the generator 10, which can improve the transmission efficiency and reduce energy loss.

[0043] Further, the output shaft of the accelerating motor 22 is connected to the input shaft of the generator 10 through a connecting shaft 24, and the output shaft of the starting motor 21 is connected to the connecting shaft 24 through a transmission member.

[0044] Optionally, the starting motor 21 is a hub motor.

[0045] Further, the transmission member is a belt 25 and a pulley 26. The pulley 26 is sleeved on the connecting shaft 24, and the output shaft of the starting motor 21 is connected to the pulley 26 through the belt 25. The starting motor 21 drives the small-diameter rotation of the connecting shaft 24 by using the large-diameter output, which can provide greater torque to facilitate the starting motor 21 to drive the generator 10 to start.

[0046] As Figure 2 shown, the energy storage power generation device of the present application further includes a counterweight wheel 40. The counterweight wheel 40 is arranged between the generator 10 and the acceleration motor 22, and both ends of the counterweight wheel 40 are respectively connected to the input shaft of the generator 10 and the output shaft of the acceleration motor 22. The counterweight wheel 40 plays a role in buffering and energy storage, and can make the generator 10 operate more smoothly.

[0047] In an embodiment, as Figure 1 shown, the energy storage power generation device of the present application further includes a distribution box 50 and a transformer box 60. The distribution box 50 is electrically connected to the generator 10, the driving mechanism 20 and the energy supply mechanism 30. The input end of the transformer box 60 is electrically connected to the generator 10, and the output end of the transformer box 60 is electrically connected to the first battery pack, the second battery assembly and the load. The distribution box 50 is used to control the coordinated operation of the generator 10, the driving mechanism 20 and the energy supply mechanism 30, and the transformer box 60 is used to adjust the voltage directly output by the generator 10 to the required voltage value range to facilitate the connection of the load and the first battery pack and the second battery pack.

[0048] For easy movement or transportation, the energy storage generator 10 of the present application further includes a frame 70. The generator 10, the driving mechanism 20, the energy supply mechanism 30, the distribution box 50 and the transformer box 60 are all installed on the frame 70. Installing the generator 10, the driving mechanism 20, the energy supply mechanism 30, the distribution box 50 and the transformer box 60 on the frame 70 can make the entire power generation device form a whole to facilitate transfer and transportation.

[0049] Optionally, the load is an electrical appliance or an energy storage cabinet. The load can be a direct electrical appliance, or the energy storage cabinet stores the electricity generated by the generator 10 and provides electrical energy through the energy storage cabinet when needed.

[0050] The present application also provides an energy storage power generation method using the above power generation device for power generation. The energy storage power generation method includes the following steps:

[0051] Before power generation, first charge the first battery pack and the second battery pack;

[0052] The first battery pack provides electrical energy for the starting motor 21, the driving motor drives the generator 10 to start generating electricity, a part of the electricity generated by the generator 10 is returned to charge the first battery pack and the second battery pack, and the other part of the electricity provides electrical energy for the load;

[0053] When the direct output voltage of the generator 10 reaches the first preset voltage threshold, the second battery pack provides electrical energy for the acceleration motor 22, and the acceleration motor 22 cuts in and starts the motor 21 to jointly drive the generator 10 to generate electricity.

[0054] By starting the motor 21 and the acceleration motor 22 to stepwise access and drive the generator 10, it is possible to better drive the generator 10, enable the generator 10 to output the required voltage faster, and since the starting motor 21 and the acceleration motor 22 jointly bear the power source of the generator 10, the loads on the starting motor 21 and the acceleration motor 22 can be reduced, which is beneficial to reducing power loss and improving the energy utilization rate.

[0055] In one embodiment, the following steps are further included:

[0056] When the direct output voltage of the generator 10 reaches the second preset voltage threshold, the mains power provides electrical energy for the speed stabilizing motor 23, and the speed stabilizing motor 23 cuts in and starts the motor 21 and the acceleration motor 22 to jointly drive the generator 10 to generate electricity, so that the direct output voltage of the generator 10 is stabilized at the third preset threshold.

[0057] By jointly driving the generator 10 by the starting motor 21, the acceleration motor 22 and the speed stabilizing motor 23, the generator 10 can operate continuously and stably, and the energy consumption of the speed stabilizing motor 23 can be reduced, which is more energy-saving.

[0058] For the sake of easy understanding, in a specific embodiment, specific parameters are substituted to introduce the solution of the present application in detail. However, it should be noted that the parameters of the present application are not limited to the following specific values.

[0059] The first battery pack is six batteries of 72V / 100A, the second battery pack is six batteries of 72V / 12A, the starting motor 21 is a 72V DC motor with a rated power of 1 kilowatt, the acceleration motor 22 is a 96V brushless DC motor with a rated power of 20 kilowatts, the speed stabilizing motor 23 is a 3-horsepower 220V DC motor, and the generator 10 is a three-phase AC generator 10 with a rated power of 50 kilowatts.

[0060] During power generation, first, the power grid during the low electricity consumption period charges the first battery pack and the second battery pack;

[0061] Then, the first battery pack provides electrical energy for the starting motor 21 to drive the generator 10 to start generating electricity. A part of the electricity generated by the generator 10 is returned to charge the first battery pack and the second battery pack, and the other part of the electricity provides electrical energy for the load;

[0062] When the direct output voltage range of the generator 10 reaches 200 volts to 250 volts, the acceleration motor 22 joins and starts the motor 21 to jointly drive the generator 10 to generate electricity;

[0063] When the direct output voltage range of the generator 10 reaches 330V to 360V, the speed-stabilizing motor 23 joins and starts the motor 21 and the acceleration motor 22 to jointly drive the generator 10 to generate electricity, so that the direct output voltage of the generator 10 is stabilized between 375V and 400V. Finally, the output voltage of the generator 10 is stabilized at 380V through the transformer box 60 to supply power to the battery pack and the load.

[0064] The energy storage power generation device of the present application has rich application scenarios, such as the following scenarios:

[0065] 1. Microgrid systems (such as photovoltaic, wind power, and energy storage) to provide stable power for communities, factories, restaurants, and other places;

[0066] 2. Data centers, as a backup power source for UPS uninterruptible power supplies to ensure continuous operation of servers;

[0067] 3. Grid peak shaving, storing electrical energy during the low electricity consumption period, and can sell electricity to the grid during the high electricity consumption period in cooperation with the electricity market policy;

[0068] 4. Emergency power sources, in case of disasters, can quickly deploy the energy storage generator 10 to restore power supply;

[0069] 5. Small and medium-sized hydropower stations, when the water level is low and the power generation is insufficient, can provide power generation operation.

[0070] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An energy storage power generation device, comprising a generator (10), characterized in that, It further includes a driving mechanism (20) for driving the generator (10) and an energy supply mechanism (30) for supplying energy to the driving mechanism (20); The driving mechanism (20) includes a starting motor (21) and an accelerating motor (22), and both the starting motor (21) and the accelerating motor (22) are in transmission connection with the generator (10); The energy supply mechanism (30) includes a first battery pack and a second battery pack. The first battery pack is electrically connected to the starting motor (21), the second battery pack is electrically connected to the accelerating motor (22), the first output end of the generator (10) is electrically connected to the first battery pack and the second battery assembly, and the second output end of the generator (10) is electrically connected to the load.

2. The device according to claim 1, wherein The driving mechanism (20) further includes a speed stabilizing motor (23). The accelerating motor (22) is a double-headed motor. The first output shaft of the accelerating motor (22) is coaxially connected to the input shaft of the generator (10), the second output shaft of the accelerating motor (22) is coaxially connected to the output shaft of the speed stabilizing motor (23), the speed stabilizing motor (23) is electrically connected to the mains power, the starting motor (21) is arranged on one side of the generator (10), and the output shaft of the starting motor (21) is connected to the input shaft of the generator (10) through a transmission member.

3. The device according to claim 2, characterized in that, The output shaft of the accelerating motor (22) is connected to the input shaft of the generator (10) through a connecting shaft (24), and the output shaft of the starting motor (21) is connected to the connecting shaft (24) through a transmission member.

4. The device according to claim 3, characterized in that, The transmission member is a belt (25) and a pulley (26). The pulley (26) is sleeved on the connecting shaft (24), and the output shaft of the starting motor (21) is connected to the pulley (26) through the belt (25).

5. The device according to claim 1, characterized in that, It further includes a counterweight wheel (40). The counterweight wheel (40) is arranged between the generator (10) and the accelerating motor (22), and both ends of the counterweight wheel (40) are respectively connected to the input shaft of the generator (10) and the output shaft of the accelerating motor (22).

6. The device according to claim 1, characterized in that, It further includes a distribution box (50) and a transformer box (60). The distribution box (50) is electrically connected to the generator (10), the driving mechanism (20) and the energy supply mechanism (30). The input end of the transformer box (60) is electrically connected to the generator (10), and the output end of the transformer box (60) is electrically connected to the first battery pack, the second battery assembly and the load.

7. The device according to claim 1, characterized in that It further includes a frame (70). The generator (10), the driving mechanism (20), the energy supply mechanism (30), the distribution box (50) and the transformer box (60) are all installed on the frame (70).

8. The device according to claim 1, characterized in that, The load is an electrical appliance or an energy storage cabinet.

9. A method for energy storage and power generation, characterized in that, Using the energy storage power generation device according to any one of the above claims 1-8 for power generation, includes the following steps: Before power generation, first charge the first battery pack and the second battery pack; The first battery pack provides electrical energy for the starting motor (21), the driving motor drives the generator (10) to start generating electricity, a part of the electricity generated by the generator (10) is returned to charge the first battery pack and the second battery pack, and another part of the electricity provides electrical energy for the load; When the direct output voltage of the generator (10) reaches the first preset voltage threshold, the second battery pack supplies electrical energy to the acceleration motor (22), and the acceleration motor (22) and the starting motor (21) jointly drive the generator (10) to generate electricity.

10. The method according to claim 9, wherein It further includes a speed stabilizing motor (23), and the following steps are also included: When the direct output voltage of the generator (10) reaches the second preset voltage threshold, the commercial power supplies electrical energy to the speed stabilizing motor (23), and the speed stabilizing motor (23), the starting motor (21), and the acceleration motor (22) jointly drive the generator (10) to generate electricity, so that the direct output voltage of the generator (10) is stabilized at the third preset threshold.

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