Voltage regulation and energy storage equipment for low-voltage power grid environment

Abstract

A voltage regulation and energy storage device for a low-voltage power grid environment relates to the technical field of power utilization of power grids, and comprises a shell, and a controller, a communication module, a bidirectional power supply and a battery which are mounted in the shell, the controller and the bidirectional power supply are electrically connected with the main circuit breaker, and the main circuit breaker is correspondingly and electrically connected with the power transmission line; an input pin of the controller is electrically connected with the current transformer, the current transformer is installed on a power transmission line, and an output pin of the controller is electrically connected with the bidirectional power supply, the battery and the upper computer through the communication module. The bidirectional power supply is electrically connected with the battery; and normal power utilization of residents in the agricultural power grid can be effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of power grid technology, specifically to a voltage regulating energy storage device for use in low-voltage power grid environments. Background Technology

[0002] The construction of new rural areas has led to a general improvement in the living standards of rural residents. The widespread use of home appliances in rural areas has further increased the burden on rural power grids. However, rural power grids in urban-rural fringe areas, rural areas, mountainous areas, and remote areas generally suffer from widespread low voltage problems, which affect residents' daily lives and production electricity use to varying degrees. Solving the low voltage problem will help "promote consumption and maintain growth".

[0003] The reason why low voltage problems are so widespread and numerous is due to the different characteristics of electricity demand at different times. Power grid construction has solved the problem of high and low voltage power supply for large areas, heavy loads, and large projects. However, it is necessary to address the challenges of 380 / 220V levels in rural power grids, such as "large load changes, high randomness, and large fluctuations," and areas where seasonal electricity use causes low voltage at the end of the grid.

[0004] Currently, the government has introduced relevant policies to encourage the installation of energy storage devices on the user side. When the power grid supplies electricity to users with energy storage devices, the devices charge during off-peak hours when electricity prices are low, and feed the stored energy back to the grid during peak hours when electricity prices are high. This can reduce energy waste and generate profits from the price difference; it can also reduce the requirements for generator sets and save costs. However, because the voltage of rural power grids is also lower during off-peak hours, the energy conversion rate of energy storage devices may not be able to support their usage during peak hours, thus still causing electricity shortages for rural power grid users. Utility Model Content

[0005] The purpose of this invention is to provide a voltage regulating energy storage device for low-voltage power grid environments, which can ensure the normal power supply for residents in rural power grids.

[0006] This utility model is achieved through the following technical solution:

[0007] A voltage regulating energy storage device for use in a low-voltage power grid environment includes a housing, and a controller, a communication module, a bidirectional power supply and a battery installed inside the housing;

[0008] The controller and bidirectional power supply are both electrically connected to the main circuit breaker, and the main circuit breaker is electrically connected to the transmission line.

[0009] The input pins of the controller are electrically connected to the current transformer, which is installed on the transmission line. The output pins of the controller are electrically connected to the bidirectional power supply, the battery, and the host computer through the communication module.

[0010] The bidirectional power supply is electrically connected to the battery.

[0011] Furthermore, a lightning and surge protector is provided between the main circuit breaker and the transmission line.

[0012] Furthermore, a temperature-controlled fan is provided inside the housing, and the power input terminal of the temperature-controlled fan is electrically connected to the main circuit breaker through a temperature control switch.

[0013] Furthermore, the temperature control fan is provided in two parts, wherein the first temperature control fan is used to blow air into the housing, and the second temperature control fan is used to exhaust air from the housing.

[0014] Furthermore, the communication module includes an RS485 communication interface and a 4G communication unit. The RS485 communication interface is wired to communicate with the bidirectional power supply and the battery respectively; the 4G communication unit is wirelessly connected to the host computer.

[0015] Furthermore, the controller uses an STM32F103C8T6 processor.

[0016] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0017] This utility model discloses a voltage regulating energy storage device for low-voltage power grid environments. Through the cooperation of a bidirectional power supply and a controller, when the voltage on the transmission line is too low, the bidirectional power supply can discharge to the transmission line to increase the voltage of the transmission line, which is beneficial to the normal electricity use of residents at the load end of the rural power grid. When the voltage on the transmission line is high, the transmission line can charge the bidirectional power supply. Since the electricity consumption of residents is small, the loss of electricity during the transmission process is avoided, thus achieving the purpose of solving energy problems. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an electrical structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the controller of this utility model.

[0020] Reference numerals in the attached diagram: 1. Housing; 2. Controller; 3. Communication module; 4. Bidirectional power supply; 5. Battery; 6. Power transmission line; 7. Main circuit breaker; 8. Current transformer; 9. Lightning and surge protector; 10. Temperature-controlled fan; 11. Temperature control switch. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1

[0027] As attached Figure 1-2 The voltage regulating energy storage device shown includes a housing 1, and a controller 2, a communication module 3, a bidirectional power supply 4 and a battery 5 installed in the housing 1.

[0028] The controller 2 and the bidirectional power supply 4 are both electrically connected to the main circuit breaker 7, and the main circuit breaker 7 is electrically connected to the transmission line 6, wherein the two ends of the transmission line 6 are respectively connected to the grid side and the user load side.

[0029] When the main circuit breaker 7 is closed, the transmission line 6 can supply power to the controller 2, and the transmission line 6 can supply power to the bidirectional power supply 4 or receive the output voltage of the bidirectional power supply 4; it should be noted that the power output or power input operation of the bidirectional power supply 4 is controlled by the controller 2 according to the voltage level on the grid side.

[0030] The input pin of the controller 2 is electrically connected to the current transformer 8, which is mounted on the transmission line 6. The output pin of the controller 2 is electrically connected to the bidirectional power supply 4, the battery 5, and the host computer through the communication module 3.

[0031] The current transformer 8 can convert a large current into a small current for easy measurement; that is, by measuring the small current on the secondary side, the actual current on the primary side can be calculated. In addition, the current transformer 8 can be used for overcurrent protection; when the current in the circuit exceeds the preset value, the current transformer 8 will detect this change and trigger protection actions through the controller 2 or other protection devices, such as disconnecting the circuit or issuing an alarm.

[0032] Furthermore, the current transformer 8 can provide real-time current data, which can be used by the controller 2 to monitor the circuit status and adjust the operating status of the bidirectional power supply 4 as needed; for example, if an abnormal current is detected, the controller 2 can adjust the output of the bidirectional power supply 4 to maintain voltage stability on the load side.

[0033] Based on the circuit status on the power transmission line 6 obtained by the current transformer 8, the controller 2 can determine whether the power consumption at the user's load end is in a high-voltage or low-voltage state, and thus control the bidirectional power supply 4 to perform charging or discharging operations through the communication module 3; and the communication between the controller 2 and the host computer can send the current operation process of this device to the host computer.

[0034] Furthermore, the controller 2 uses an STM32F429VI T6 processor; the specific functions of this chip are as follows:

[0035] 1. High performance: This processor is based on the ARM Cortex-M4 core and operates at a frequency of up to 180MHz, providing powerful processing capabilities; it integrates a floating-point unit, supports single-precision and double-precision floating-point operations, and is suitable for applications requiring complex mathematical calculations; it supports digital signal processing instruction sets and is suitable for fields such as audio processing and motor control.

[0036] 2. Large-capacity storage:

[0037] It has a built-in 2MB Flash memory, suitable for storing large amounts of program code and data; it uses 256KB SRAM, providing ample running memory for applications, making it particularly suitable for real-time applications.

[0038] 3. Abundant peripheral interfaces

[0039] It includes multiple USART, SPI, I2C, CAN, USB OTG, etc., to meet diverse communication needs; it integrates ADC (analog-to-digital converter), DAC (digital-to-analog converter), comparator, etc., to facilitate analog signal processing; it has a variety of timers, including advanced timers, general-purpose timers, low-power timers, etc., suitable for precise time management and control applications;

[0040] 4. Graphic display function

[0041] It features a built-in LCD-TFT controller 2 that supports color displays with resolutions up to XGA (1024x768), making it ideal for applications requiring a graphical user interface; and a Chrom-ART accelerator to speed up graphics rendering and improve graphics processing efficiency.

[0042] 5. Low power management

[0043] Multiple low-power modes: including sleep, stop, and standby modes, which can flexibly adjust power consumption according to application needs; built-in voltage regulator can maintain stable performance under different power supply conditions.

[0044] 6. Reliability and stability

[0045] It supports an operating temperature range of -40℃ to +85℃, ensuring stable operation in various environments; it integrates multiple anti-interference measures to improve system reliability.

[0046] The bidirectional power supply 4 is electrically connected to the battery 5;

[0047] The bidirectional power supply 4 and the battery 5 together form a backup power supply 4 system to ensure that the power supply to the user load remains stable when there is a fault or voltage fluctuation on the grid side.

[0048] The bidirectional power supply 4 typically has the ability to flow energy in both directions. It can be used as a power supply 4 to supply power to the load, or as a charger to charge the battery module 5. Under normal circumstances, the bidirectional power supply 4 can obtain power from the grid side and then output it to the battery 5 for storage. In the event of grid failure or voltage fluctuation, the bidirectional power supply 4 can switch to the battery 5 power supply mode, directly obtain power from the battery module 5 and supply power to the load.

[0049] Battery module 5, acting as an energy storage unit, can store electrical energy when the power grid is normal and release it when the power grid fails. The operating mode of battery module 5 is as follows: under normal power grid conditions, battery module 5 is typically in a charging state, with charging current supplied by bidirectional power supply 4. During a power grid failure, battery module 5 releases electrical energy and supplies power to the load through bidirectional power supply 4.

[0050] In addition, the charging process of the bidirectional power supply 4 is as follows:

[0051] When the mains voltage is higher than the charging threshold (U-CH) value (default 224V, can be freely set), controller 2 sends a charging command to bidirectional power supply 4 via RS485 communication. The command includes the charging mode and power step value Pstp (default 300W, can be freely set). After receiving the command, bidirectional power supply 4 charges at a power of 300W. At this time, the mains voltage drops due to the increased load, and the mains voltage may fall into one of the following three situations:

[0052] a. If the voltage is still higher than the threshold (224V), the controller 2 will increase the step value by 2 times the original step value and send a command to the bidirectional power supply 4. After receiving the command, the bidirectional power supply 4 will charge at twice the original power. This process continues until the mains voltage is lower than the charging threshold.

[0053] b. If the voltage is still below the threshold (224V) and above the threshold -8V (224-8=116) at this time, the controller 2 does not perform any operation, and the bidirectional power supply 4 maintains the current power charging.

[0054] c. If the voltage is still below the threshold value of -8V (224-8=216) at this time, the controller 2 sends a stop charging command to the bidirectional power supply 45, and the bidirectional power supply 4 executes a shutdown and stops charging the battery pack 5.

[0055] The discharge process of bidirectional power supply 4 is as follows:

[0056] When the mains voltage is lower than the discharge threshold (U-FL) (default 200V, freely adjustable), controller 2 sends a discharge command to bidirectional power supply 4 via RS485 communication. The command includes the discharge mode and power step value Pstp (default 300W, freely adjustable). Upon receiving the command, bidirectional power supply 4 discharges at a power of 300W. At this time, the mains voltage rises due to the reduced load, and the mains voltage exhibits the following three situations:

[0057] d. If the voltage is still below the threshold (200V) at this time, the controller 23 increases the step value by 2 times the original step value on the original power and sends a command to the bidirectional power supply 4. After receiving the command, the bidirectional power supply 4 discharges at twice the original power, and so on, until the mains voltage value is higher than the discharge threshold.

[0058] e. If the voltage is still higher than the threshold (200V) and lower than the threshold +8V (200+8=208) at this time, the controller 2 does not perform any operation, and the bidirectional power supply 4 maintains the current power discharge.

[0059] If the voltage is still higher than the threshold value +8V (200+8=208) at this time, the controller 2 sends a stop charging command to the bidirectional power supply 4, and the bidirectional power supply 4 shuts down and does not discharge the battery pack 5.

[0060] In addition, the charging and discharging time periods can be set in the controller 2, controlling the bidirectional power supply 4 to charge during periods of lower user electricity prices and discharge during periods of higher electricity prices. This provides a broad market prospect for the development of energy storage technology, enabling this energy storage device to effectively store and release electrical energy, allowing users to charge and discharge reasonably according to changes in time-of-use electricity prices, thereby reducing electricity costs. At the same time, the energy storage device can also alleviate the supply and demand contradiction of the power system and improve the operating efficiency of the power system.

[0061] Specifically, a surge protector 9, or SPD, is provided between the main circuit breaker 7 and the transmission line 6;

[0062] SPDs can quickly respond to and conduct overvoltage, diverting it to ground to protect other devices in the circuit, such as bidirectional power supply 4 and battery module 5, from overvoltage damage. When a voltage surge occurs in the power grid, the SPD clamps the voltage to a safe level to prevent the voltage from exceeding the equipment's withstand voltage range. By absorbing and diverting overvoltages, SPDs can improve the reliability of the entire system and reduce equipment failures and downtime caused by voltage surges.

[0063] Example 2

[0064] The housing 1 is equipped with a temperature control fan 10. The power input terminal of the temperature control fan 10 is electrically connected to the main circuit breaker 7 through a temperature control switch 11. The temperature control fan 10 can reduce the temperature inside the housing 1, thereby preventing the components inside the housing 1 from being in a high-temperature environment. The temperature control switch 11 is model rt103, which can detect the temperature inside the housing 1 and automatically control the temperature control fan 10 to work according to the preset temperature threshold.

[0065] In addition, two temperature control fans 10 are provided, wherein the first temperature control fan is used to blow air into the housing 1, and the second temperature control fan is used to exhaust the air inside the housing 1. The flow of gas inside the housing 1 can be completed by the two temperature control fans 10, thereby improving the efficiency of cooling the housing 1.

[0066] Example 3

[0067] The communication module 3 includes an RS485 communication interface and a 4G communication unit. The RS485 communication interface is wired to communicate with the bidirectional power supply 4 and the battery 5 respectively. The 4G communication unit is wirelessly connected to the host computer.

[0068] Since the bidirectional power supply 4, battery 5 and controller 2 are all inside the housing 1, wired communication can ensure stable signal transmission without incurring excessive costs. However, the communication distance between controller 2 and the host computer is relatively long, so wireless communication can save some production costs.

[0069] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A voltage regulating energy storage device for use in low-voltage power grid environments, characterized in that: It includes a housing (1), and a controller (2), a communication module (3), a bidirectional power supply (4), and a battery (5) installed inside the housing (1); The controller (2) and the bidirectional power supply (4) are both electrically connected to the main circuit breaker (7), and the main circuit breaker (7) is electrically connected to the transmission line (6); The input pin of the controller (2) is electrically connected to the current transformer (8), which is installed on the power transmission line (6). The output pin of the controller (2) is electrically connected to the bidirectional power supply (4), the battery (5) and the host computer through the communication module (3). The bidirectional power supply (4) is electrically connected to the battery (5).

2. The voltage regulating energy storage device for low-voltage power grid environments according to claim 1, characterized in that: A lightning and surge protector (9) is provided between the main circuit breaker (7) and the power transmission line (6).

3. The voltage regulating energy storage device for low-voltage power grid environments according to claim 1, characterized in that: The housing (1) is equipped with a temperature control fan (10), and the power input terminal of the temperature control fan (10) is electrically connected to the main circuit breaker (7) through a temperature control switch (11).

4. The voltage regulating energy storage device for low-voltage power grid environments according to claim 3, characterized in that: The temperature control fan (10) is provided in two parts, wherein the first temperature control fan is used to blow air into the housing (1) and the second temperature control fan is used to exhaust the air inside the housing (1).

5. The voltage regulating energy storage device for low-voltage power grid environments according to claim 1, characterized in that: The communication module (3) includes an RS485 communication interface and a 4G communication unit. The RS485 communication interface is wired to communicate with the bidirectional power supply (4) and the battery (5) respectively. The 4G communication unit is wirelessly connected to the host computer.

6. The voltage regulating energy storage device for low-voltage power grid environments according to claim 1, characterized in that: The controller (2) uses a processor with model number STM32F429VIT6.

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