Portable device for increasing voltage of power distribution area by using energy storage equipment

Abstract

The utility model provides a portable device using energy storage equipment to boost the voltage of a power distribution area, which comprises a portable energy storage box and an access module, an energy storage battery, an inverter, a controller and a voltage stabilizer are arranged in the portable energy storage box, an energy collector is arranged on the side surface of the portable energy storage box, the output end of the energy collector is connected with the input end of the voltage stabilizer, and the access module is connected with the energy collector. The output end of the voltage stabilizer is connected with the power input end of the controller, the controller is suitable for being in communication connection with a line voltage monitor arranged at the tail end of a power distribution network, the first control end of the controller is connected with a charging port of the energy storage battery, and the second control end of the controller is connected with the control end of the inverter. A first port of the inverter is connected with a charging and discharging port of the energy storage battery, a second port of the inverter is connected with the access module through a wire, and the access module is suitable for being hung on a distribution line. The device has a plug-and-play characteristic, and can carry out targeted, flexible and rapid treatment on the low voltage of the transformer area.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply at the end of a distribution network, and in particular to a portable device for increasing the voltage of a distribution station area by utilizing energy storage equipment. Background Art

[0002] GB / T12325-2008, "Power Quality Supply Voltage Deviation," stipulates the "limits for supply voltage deviation" at the end of a distribution station, namely, "220V single-phase supply voltage deviation is +7% to -10% of the nominal voltage." Therefore, if the supply voltage at the end of a distribution station falls below 198V (i.e., a deviation of -10% of the nominal voltage), it is considered to be low voltage. Factors such as increased power load, a long power supply radius, insufficient upstream power supply points, improperly positioned substation taps, and seasonal load variations can lead to severely low voltage at the end of a distribution station line.

[0003] Existing solutions to this problem include building new distribution transformers to split the load to shorten the power supply radius, changing conductor cross-sections, and installing reactive power compensation devices or voltage regulators. However, these approaches suffer from limitations such as single models, extensive equipment, and significant funding requirements. This results in a significant lack of flexibility and specificity in addressing low voltage issues in distribution areas.

[0004] The use of energy storage equipment for low voltage management has gradually become a solution worth trying. The current solution usually uses a host combined with energy storage as the core module, storing energy during periods of low load and high voltage such as at night, and automatically compensating power to the grid during periods of high load and low voltage such as peak power consumption in the morning and evening, and supplying power to the load together with the substation to achieve the purpose of increasing the terminal power voltage. However, the inventors of this application have found through research that, in essence, the above solution is still a traditional method of fixed (long-term) investment in equipment, which requires a huge amount of funds and equipment, and cannot improve the flexibility and pertinence of the low voltage problem management work in the distribution station area. Utility Model Content

[0005] In view of the technical problem that the existing method for managing low voltage in distribution station areas is still a traditional method of fixed (long-term) investment in equipment, which requires huge amounts of funds and equipment and cannot improve the flexibility and pertinence of the work of managing low voltage problems in distribution station areas, the utility model provides a portable device that uses energy storage equipment to increase the voltage in distribution station areas. The device has the characteristics of plug and play and can carry out targeted, flexible and rapid management of low voltage in the station area.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A portable device for boosting the voltage of a distribution network area using an energy storage device comprises a portable energy storage box and an access module. The portable energy storage box is internally provided with an energy storage battery, an inverter, a controller and a voltage stabilizer. An energy harvester is provided on the side of the portable energy storage box. The output end of the energy harvester is connected to the input end of the voltage stabilizer, and the output end of the voltage stabilizer is connected to the power input end of the controller. The controller is adapted to be communicatively connected with a line voltage monitor arranged at the end of the distribution network. The first control end of the controller is connected to the charging port of the energy storage battery, the second control end of the controller is connected to the control end of the inverter, the first port of the inverter is connected to the charging and discharging port of the energy storage battery, the second port of the inverter is connected to the access module via a wire, and the access module is adapted to be hooked up to the distribution line.

[0008] Compared with the prior art, the portable device provided by the present invention that utilizes energy storage equipment to increase the voltage of a distribution station area is used. When the operation and maintenance staff can carry a single set of the device with them (or in a car) to a 380V line in the selected area, and after the access module is hung on the distribution line for live installation, the device can be put into operation. One set of the device can solve the low voltage problem of a distribution station area. The controller of the device in operation communicates with the line voltage monitor set at the end of the distribution network, fully senses the line voltage and the voltage of the energy storage battery, and adjusts the total amount and method of charging and discharging the energy storage battery in real time according to the principle of adjusting the area line voltage to not less than 198V. Specifically, when the voltage monitor at the end of the distribution network When the voltage at the point is lower than 198V, the controller will control the inverter to feed power to the grid and adjust the inverter feeding power so that the voltage at the monitoring point reaches the system preset value. Under this condition, the energy storage battery and the power grid provide energy to the user at the same time. When the voltage at the voltage monitoring point at the end of the distribution network is greater than 230V, the controller will adjust the inverter to charge the energy storage battery, and the power grid will supply power to the user separately. When the voltage at the voltage monitoring point at the end of the distribution network reaches the set value of 220V, the energy harvester will transfer the converted voltage to the controller through the voltage stabilizer to charge the energy storage battery. After the low voltage phenomenon is improved, the voltage will be continuously monitored, and the relevant data can be viewed synchronously on an external display. After the low voltage control work in a certain area is completed, the device can be taken away to other areas to continue the low voltage control work by disassembling the access module connected to the distribution line. Therefore, using the portable device provided by this application, a new model for managing low voltage problems in distribution substations can be established. The working methods presented to operation and maintenance personnel are: (1) targeted search for low voltage substations, (2) plug-and-play configuration of the device, (3) comprehensive perception of line and energy storage device voltages, (4) real-time adjustment of the total amount and method of energy storage battery charge and discharge, and (5) continuous monitoring after the voltage is increased. This working method converts the passive management of low voltage in the substation into active prevention and control, which can achieve "double reduction" of manpower and material resources; at the same time, it can also achieve "double improvement" of work efficiency and power supply stability, which has important application value.

[0009] Furthermore, rollers are provided at the bottom of the portable energy storage box.

[0010] Furthermore, the energy harvester includes a fixed end, an elastic metal substrate, a mass block, an upper piezoelectric sheet and a lower piezoelectric sheet. The fixed end is fixedly installed inside a portable energy storage box, one end of the elastic metal substrate is fixedly connected to the fixed end, and the other end of the elastic metal substrate extends out of the side wall of the portable energy storage box and is fixedly connected to the mass block. The upper piezoelectric sheet and the lower piezoelectric sheet are respectively bonded to the upper and lower surfaces of the elastic metal substrate and connected to the input end of the regulator.

[0011] Furthermore, there are multiple elastic metal substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the composition of a portable device provided by the utility model for using energy storage equipment to increase the voltage in a distribution station area.

[0013] Figure 2 This is a structural diagram of the energy harvester provided by the utility model.

[0014] Figure 3 The utility model is a schematic diagram of the principle of using the portable device provided by the utility model to manage low voltage in a transformer area.

[0015] Figure 4 The utility model is a schematic diagram of the principle of using the portable device provided by the utility model to carry out phase separation treatment of low voltage in the transformer area.

[0016] In the figure, 1. Portable energy storage box; 2. Access module; 3. Energy storage battery; 4. Inverter; 5. Controller; 6. Voltage stabilizer; 7. Energy harvester; 71. Fixed end; 72. Elastic metal substrate; 73. Mass block; 74. Upper piezoelectric sheet; 75. Lower piezoelectric sheet; 8. Roller. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0018] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0020] Please refer to Figure 1As shown, the utility model provides a portable device for increasing the voltage of a distribution station area by using an energy storage device, comprising a portable energy storage box 1 and an access module 2, wherein the interior of the portable energy storage box 1 is provided with an energy storage battery 3, an inverter 4, a controller 5 and a voltage stabilizer 6, wherein the access module 2 can be specifically implemented by an existing conductive mounting lock, and the controller 5 can be specifically implemented by an existing single-chip microcomputer, and the specific structure and working principle of the access module 2, energy storage battery 3, inverter 4, controller 5 and voltage stabilizer 6 are well known to those skilled in the art, and therefore are not described in detail here; an energy harvester 7 is provided on the side of the portable energy storage box 1, and the output end of the energy harvester 7 is connected to the input end of the voltage stabilizer 6, and the output end of the voltage stabilizer 6 is connected to the power input end of the controller 5, and the energy harvester 7 is used to power the controller 5 after the converted voltage is stabilized and regulated by the voltage stabilizer 6, thereby replenishing the energy required for the device; the controller 5 is suitable for being connected to a power supply unit provided at a The line voltage monitor at the end of the distribution network is communicatively connected. Specifically, a voltage monitor such as a voltage transformer is provided on the line at the end of the existing distribution network. The voltage monitor and the controller 5 are communicatively connected through an existing communication unit such as a ZigBee wireless communication module and its relay module to transmit the line voltage monitored by the voltage monitor to the controller 5 for perception. The first control end of the controller 5 is connected to the charging port of the energy storage battery 3 so that the voltage converted by the energy harvester 7 is transmitted to the controller through the voltage stabilizer to charge the energy storage battery 3. The second control end of the controller 5 is connected to the control end of the inverter 4 so that the total amount and mode of charging and discharging of the energy storage battery 3 can be adjusted through the inverter 4. The first port of the inverter 4 is connected to the charging and discharging port of the energy storage battery 3, and the second port of the inverter 4 is connected to the access module 2 through a wire. The access module 2 is suitable for being hung on the distribution line, that is, the access module 2 is only hung on the existing distribution line when this device is used.

[0021] Compared with the prior art, the portable device provided by the present invention that utilizes energy storage equipment to increase the voltage of a distribution station area is used. When the operation and maintenance staff can carry a single set of the device with them (or in a car) to a 380V line in the selected area, and after the access module is hung on the distribution line for live installation, the device can be put into operation. One set of the device can solve the low voltage problem of a distribution station area. The controller of the device in operation communicates with the line voltage monitor set at the end of the distribution network, fully senses the line voltage and the voltage of the energy storage battery, and adjusts the total amount and method of charging and discharging the energy storage battery in real time according to the principle of adjusting the area line voltage to not less than 198V. Specifically, when the voltage monitor at the end of the distribution network When the voltage at the point is lower than 198V, the controller will control the inverter to feed power to the grid and adjust the inverter feeding power so that the voltage at the monitoring point reaches the system preset value. Under this condition, the energy storage battery and the power grid provide energy to the user at the same time. When the voltage at the voltage monitoring point at the end of the distribution network is greater than 230V, the controller will adjust the inverter to charge the energy storage battery, and the power grid will supply power to the user separately. When the voltage at the voltage monitoring point at the end of the distribution network reaches the set value of 220V, the energy harvester will transfer the converted voltage to the controller through the voltage stabilizer to charge the energy storage battery. After the low voltage phenomenon is improved, the voltage will be continuously monitored, and the relevant data can be viewed synchronously on an external display. After the low voltage control work in a certain area is completed, the device can be taken away to other areas to continue the low voltage control work by disassembling the access module connected to the distribution line. Therefore, using the portable device provided by this application, a new model for managing low voltage problems in distribution substations can be established. The working methods presented to operation and maintenance personnel are: (1) targeted search for low voltage substations, (2) plug-and-play configuration of the device, (3) comprehensive perception of line and energy storage device voltages, (4) real-time adjustment of the total amount and method of energy storage battery charge and discharge, and (5) continuous monitoring after the voltage is increased. This working method converts the passive management of low voltage in the substation into active prevention and control, which can achieve "double reduction" of manpower and material resources; at the same time, it can also achieve "double improvement" of work efficiency and power supply stability, which has important application value.

[0022] As a specific example, please refer to Figure 1 As shown, the bottom of the portable energy storage box 1 is provided with rollers 8, thereby facilitating the movement of the device on the ground.

[0023] As a specific example, please refer to Figure 2As shown, the energy harvester 7 in the present device adopts a bimorph piezoelectric cantilever beam structure, and the energy harvester 7 includes a fixed end 71, an elastic metal substrate 72, a mass block 73, an upper piezoelectric sheet 74 and a lower piezoelectric sheet 75. The fixed end 71 is fixedly mounted inside the portable energy storage box 1, one end of the elastic metal substrate 72 is fixedly connected to the fixed end 71, and the other end of the elastic metal substrate 72 extends out of the side wall of the portable energy storage box 1 and is fixedly connected to the mass block 73. The upper piezoelectric sheet 74 and the lower piezoelectric sheet 75 are respectively bonded to the upper and lower surfaces of the elastic metal substrate 72 and connected to the input end of the voltage regulator 6, that is, the upper piezoelectric sheet 74 is bonded to the upper surface of the elastic metal substrate 72, and the lower piezoelectric sheet 75 is bonded to the lower surface of the elastic metal substrate 72, and the upper piezoelectric sheet 74 and the lower piezoelectric sheet 75 are connected to the input end of the voltage regulator 6 to send the converted voltage to the voltage regulator 6 for voltage regulation. The energy harvester 7 in this embodiment operates as follows: When an external vibration source (such as mechanical vibration or human motion) excites the bimorph piezoelectric cantilever, the elastic metal substrate 72, along with the upper and lower piezoelectric plates 74 and 75 attached to its upper and lower surfaces, bends and deforms, generating electric charge on the material surface. According to the theory of the direct piezoelectric effect, the free charge accumulates on the surface of the piezoelectric plates and outputs a voltage, converting mechanical energy into electrical energy. Compared to single-crystal piezoelectric cantilevers, this bimorph piezoelectric cantilever offers significant advantages in structural rigidity and the ability to output more electrical energy for the same degree of deformation.

[0024] As a preferred embodiment, please refer to Figure 2 As shown, there are multiple elastic metal substrates 72, which can accumulate free charges on the surfaces of multiple piezoelectric sheets and output voltage, thereby improving the power output efficiency.

[0025] Specifically, the principle diagram of using this device to increase the voltage in the distribution area is as follows: Figure 3 As shown, based on Figure 3 The connection topology shown can achieve voltage regulation in the substation area and supplement the energy required by the device through the energy harvester. When the device is working, there are three modes:

[0026] (1) When the voltage at the voltage monitoring point at the end of the distribution network is lower than 198V, the controller will control the inverter to feed power to the grid and adjust the inverter feeding power so that the voltage at the monitoring point reaches the system preset value. In this case, the energy storage battery and the grid provide energy to the user at the same time.

[0027] (2) When the voltage at the voltage monitoring point at the end of the distribution network is greater than 230V, the controller will adjust the inverter to charge the energy storage battery, and at the same time the grid will supply power to the user alone.

[0028] (3) When the voltage at the voltage monitoring point at the end of the distribution network reaches the set value of 220V, the energy harvester will transmit the converted voltage to the controller through the voltage stabilizer to charge the energy storage battery.

[0029] Furthermore, when there is a three-phase load imbalance, resulting in a three-phase voltage imbalance, the conventional experience is to use a three-phase inverter solution for compensation. As long as one phase voltage is lower than 198V, only three phases can be compensated simultaneously. When the three-phase imbalance is serious, there is over-compensation of the light-load phase, causing the inverter overvoltage protection to operate. To solve this problem, a phase-splitting compensation solution can be used. The principle is as follows: Figure 4 Specifically, the portable device connects the low-voltage three-phase circuit to each other and monitors the three-phase voltage. Compensation is performed on the phase with the lowest voltage; otherwise, no compensation is performed. Simultaneously, if the voltage is too high, the energy storage battery is charged to reduce the voltage. This effectively mitigates the risk of overvoltage caused by simultaneous compensation of the three-phase inverter and solves the problem of three-phase imbalance.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A portable device for increasing the voltage of a distribution station area using an energy storage device, characterized in that: It includes a portable energy storage box and an access module. The portable energy storage box is equipped with an energy storage battery, an inverter, a controller and a voltage stabilizer. An energy harvester is provided on the side of the portable energy storage box. The output end of the energy harvester is connected to the input end of the voltage stabilizer, and the output end of the voltage stabilizer is connected to the power input end of the controller. The controller is suitable for communicating with a line voltage monitor arranged at the end of the distribution network. The first control end of the controller is connected to the charging port of the energy storage battery, the second control end of the controller is connected to the control end of the inverter, the first port of the inverter is connected to the charging and discharging port of the energy storage battery, and the second port of the inverter is connected to the access module through a wire. The access module is suitable for being hung on the distribution line.

2. The portable device for increasing the voltage of a distribution station area using an energy storage device according to claim 1, characterized in that: The bottom of the portable energy storage box is provided with rollers.

3. The portable device for increasing the voltage of a distribution station area using an energy storage device according to claim 1, characterized in that: The energy harvester includes a fixed end, an elastic metal substrate, a mass block, an upper piezoelectric sheet and a lower piezoelectric sheet. The fixed end is fixedly installed inside a portable energy storage box, one end of the elastic metal substrate is fixedly connected to the fixed end, and the other end of the elastic metal substrate extends out of the side wall of the portable energy storage box and is fixedly connected to the mass block. The upper piezoelectric sheet and the lower piezoelectric sheet are respectively bonded to the upper and lower surfaces of the elastic metal substrate and connected to the input end of the regulator.

4. The portable device for increasing the voltage in a distribution area using an energy storage device according to claim 3, characterized in that: There are multiple elastic metal substrates.

Images