A rural power grid voltage monitoring and control device

Abstract

The utility model discloses a rural power grid voltage monitoring and control device, which belongs to the field of power system automation and intelligent control technology, including an installation foundation set at the middle and rear sections of the rural power grid line or at the contact / section switch, a complete set of equipment on the installation foundation is provided with a control box, a local intelligent unit terminal is provided in the control box, and the local intelligent unit terminal includes an energy supply module, a central control module, a communication module and an execution module connected to each other, and a plurality of sensors responsible for real-time collection of rural power grid voltage and current data are provided in the rural power grid line, and the sensor uploads the data to the central control module; the central control module realizes communication connection with a host computer by means of the communication module, and displays the rural power grid voltage and current data in the host computer, and the host computer issues an adjustment instruction to the central control module, and the execution module executes the adjustment instruction to adjust the rural power grid voltage. The utility model effectively improves the efficiency and safety of the comprehensive device for rural power grid voltage management, and also improves the power supply capacity of the control device.

Description

Technical Field

[0001] The utility model relates to the technical field of power system automation and intelligent control, in particular to a rural power grid voltage monitoring and control device, which is used to improve the efficiency and safety of a rural power grid voltage management device. Background Art

[0002] In the current field of rural power grid voltage management, the debugging and operation of the voltage comprehensive management device has always been a technical problem. The traditional method usually requires personnel to go to the device installation location in person and debug and operate through wired connection or on-site operation interface. However, since the rural power grid voltage management comprehensive device is often installed in the middle and rear sections of the line or at the transfer / section switch, these locations often require the construction of a higher installation foundation. Such an installation environment not only brings great inconvenience to the debugging work, but also increases the safety risk of the debugging personnel. Secondly, the installation location cannot directly provide the power supply of the control device. It is often provided by the PT secondary. When a short circuit occurs on the secondary side of the PT, the current of the PT will increase sharply, which will cause the PT to be overloaded and damaged, resulting in insulation breakdown, which poses a serious threat to personal safety and equipment safety, and there is a risk of system operation. Therefore, there is an urgent need for a rural power grid voltage monitoring and control device, which can realize remote debugging and operation functions, so that personnel can debug and operate the rural power grid voltage management comprehensive device without climbing, and can improve the power supply safety performance, while improving the energy transmission efficiency, so that the use of the voltage monitoring and control device is more efficient and stable. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rural power grid voltage monitoring and control device, aiming to solve the debugging and operation difficulties caused by the high location of the equipment and the complex environment in the traditional method. At the same time, the power supply is unstable, and the efficiency and safety are difficult to guarantee.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a rural power grid voltage monitoring and control device, including an installation foundation arranged at the rear section of the rural power grid line or at the switch, wherein the switch is a transfer switch or a sectional switch, a control box is arranged on the installation foundation, and an on-site intelligent unit terminal is arranged in the control box, and the on-site intelligent unit terminal includes an energy supply module, a central control module, a communication module and an execution module connected to each other, wherein the energy supply module includes an energy supply core sleeved on the rural power grid line, a coil is wound on the energy supply core, and a controllable susceptance resonance compensation module, a rectifier module and a DC- DC module; wherein the controllable susceptance resonance compensation module includes a fixed capacitor C and an adjustable inductor L, and the inductor L is provided with thyristors V1 and V2; a plurality of sensor nodes are provided in the rural power grid line, and the sensor nodes are provided with sensors responsible for real-time collection of voltage and current data of the rural power grid, and the sensors upload the data to the central control module; the central control module realizes communication connection with the host computer with the help of the communication module, and displays the voltage and current data of the rural power grid in the host computer, and the host computer sends adjustment instructions to the central control module with the help of the communication module, and the central control module controls the execution module to execute the adjustment instructions according to the adjustment instructions, so as to adjust the voltage of the rural power grid.

[0005] A further improvement of the technical solution of the utility model is that an STM32 chip is used as a main chip in the central control module, and an analog signal is converted into a digital signal through an analog-to-digital converter.

[0006] A further improvement of the technical solution of the utility model is that: the sensor nodes in the rural power grid are specifically arranged at both sides of the rural power grid transformer, and the sensors are voltage sensors and current sensors.

[0007] A further improvement of the technical solution of the utility model is that the central control module can send a trigger signal to the thyristors V1 and V2 to switch them from the off state to the on state, thereby achieving stepless adjustment of the equivalent value of the inductance.

[0008] A further improvement of the technical solution of the utility model is that the host computer is a tablet computer or a mobile phone.

[0009] A further improvement of the technical solution of the utility model is that the execution module is a motor for controlling the on-load switch, and the central control module controls the forward and reverse rotation of the motor of the execution module and thus controls the gear position of the on-load switch of the rural power transformer.

[0010] A further improvement of the technical solution of the utility model is that the communication module is a Lora wireless communication module, and the communication chip is a Semtech SX127x.

[0011] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is: by adopting wireless technology, the central control module and the host computer are connected by wireless communication module, and the personnel do not need to go to the equipment site, and can realize remote operation of the local intelligent unit terminal only through the host computer software. This not only saves the time and energy of the personnel, but also avoids the difficult problems caused by factors such as the high location of the equipment and the complex environment. By using the electromagnetic field energy of the power grid itself to provide a stable and reliable power supply for the device, the problem of limited traditional power supply methods is solved. Non-contact energy collection improves safety. This power supply method not only innovates the power supply method of the rural power grid voltage management device, but also improves the safety and reliability of the device. At the same time, since no external power supply is required, the maintenance cost and installation difficulty of the device are also reduced. By setting a controllable susceptance method to equivalent capacitance and then matching the excitation inductance to form a resonant circuit, the trigger angle of the thyristor can be adjusted by adjusting the device, and the resonance effect is achieved in real time to obtain the best energy transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the structure composition of the utility model;

[0014] Figure 2 Schematic diagram of the energy supply module;

[0015] Figure 3 Schematic diagram of the energy module's smart susceptance resonant compensator. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the embodiments:

[0017] like Figure 1As shown, it is a structural schematic diagram of a rural power grid voltage monitoring and control device, specifically, an installation base set at the rear section of the rural power grid line or at the switch, wherein the switch is a transfer switch or a sectional switch, and a control box is set on the installation base, and a local intelligent unit terminal is set in the control box, and the local intelligent unit terminal communicates with the host computer through a wireless communication module. The local intelligent unit terminal includes an energy supply module, a central control module, a communication module and an execution module that are interconnected. A plurality of sensor nodes are set in the rural power grid line, and sensors responsible for real-time collection of rural power grid voltage and current data are set on the sensor nodes, and the sensors upload the data to the central control module; the central control module realizes communication connection with the host computer with the help of the communication module, and displays the rural power grid voltage and current data in the host computer. The operator can monitor the voltage and current data in the rural power grid in real time through the host computer. When the voltage is found to be too high or too low, the host computer can use the communication module to send adjustment instructions to the central control module with the help of the communication module, and the central control module controls the execution module to execute the adjustment instructions according to the adjustment instructions to adjust the voltage of the rural power grid. The specific host computer system is implemented through software installed on a tablet or mobile phone, with a friendly user interface and powerful functions. Personnel can remotely debug and operate the local intelligent unit terminal through the host computer software without on-site operation, which greatly improves efficiency and safety. At the same time, the host computer system can also display rural grid voltage data, governance effects and other information in real time, providing personnel with comprehensive monitoring and data analysis functions.

[0018] like Figure 2 The energy supply module shown uses the electromagnetic field energy of the power grid to provide a stable and reliable power supply for the device. The module captures energy from the power grid through the power CT, including an energy supply core set on the rural power grid line, a coil is wound on the energy supply core, and the captured energy is converted into stable direct current to power the device through a controllable susceptance resonance compensator, a rectifier module, and a DC-DC module. Figure 3The controllable susceptance resonant compensator shown in the figure uses controllable susceptance to improve the energy transmission efficiency. The controllable susceptance consists of a fixed capacitor C and an adjustable inductor L. The adjustable inductance value L is achieved by controlling the trigger angle of the thyristors V1 and V2, and then the adjustable equivalent capacitance is obtained. When the equivalent capacitance resonates with the excitation inductance, the energy exchange between them will reach the optimal state, thereby reducing the energy loss during the transmission process and improving the energy transmission efficiency of the entire system. Resonance is a special circuit state in which the energy of the capacitor and the inductor is exchanged back and forth in the circuit without net energy loss to the external circuit. Therefore, in the resonant state, the energy transmission efficiency will be significantly improved because the energy is mainly exchanged between the capacitor and the inductor instead of being consumed by the resistor. Determine the excitation inductance value in the circuit and the required resonant frequency. The central control module sends a trigger signal to the thyristors V1 and V2 to switch them from the off state to the on state, thereby realizing the stepless adjustment of the equivalent value of the inductance. By adjusting the trigger angle of the thyristors V1 and V2, the value of the inductor L can be changed. This can be achieved by controlling the on-time and duty cycle of the thyristor.

[0019] As the hub of the local intelligent unit terminal, the central control module is responsible for receiving instructions from the host computer system, performing logical analysis based on the data collected by the sensor network, and sending corresponding control instructions to the voltage management executive agency. The integrated control module uses a high-performance processor and advanced control algorithm to achieve fast and accurate control decisions. The STM32 chip is used as the main chip in the central control module, and the analog signal is converted into a digital signal through an analog-to-digital converter. After collecting the data from the sensor network, data comparison, threshold judgment, algorithm operation, etc. are performed to determine the current system state or predict future trends. After logical analysis, control instructions are issued to control the voltage management executive module. The communication module is a Lora wireless communication module, and the communication chip is Semtech SX127x. The executive module specifically controls the motor of the on-load switch. The central control module controls the forward and reverse rotation of the executive module motor and controls the on-load switch of the rural power transformer to adjust the gear position, thereby adjusting the rural power voltage and achieving precise voltage management. The sensor node setting position in the rural power line is specifically on both sides of the rural power transformer. The sensors are voltage sensors and current sensors, which collect the voltage and current data of the rural power grid in real time and send the data to the central control module. Sensor nodes use high-precision and high-reliability sensors to ensure the accuracy and reliability of data.

[0020] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A rural power grid voltage monitoring and control device, comprising an installation foundation arranged at the rear section of the rural power grid line or at a switch, wherein the switch is a transfer switch or a sectional switch, and a control box is arranged on the installation foundation, characterized in that: An on-site intelligent unit terminal is arranged in the control box, and the on-site intelligent unit terminal comprises an energy supply module, a central control module, a communication module and an execution module which are interconnected, wherein the energy supply module comprises an energy supply core which is sleeved on the rural power grid line, a coil is wound on the energy supply core, and a controllable susceptance resonance compensation module, a rectifier module and a DC-DC module are connected on the coil line; wherein the controllable susceptance resonance compensation module comprises a fixed capacitor C and an adjustable inductor L, and thyristors V1 and V2 are arranged on the inductor L; a plurality of sensor nodes are arranged in the rural power grid line, and sensors which are responsible for real-time collection of voltage and current data of the rural power grid are arranged on the sensor nodes, and the sensors upload the data to the central control module; the central control module realizes communication connection with the host computer by means of the communication module, and displays the voltage and current data of the rural power grid in the host computer, and the host computer issues adjustment instructions to the central control module by means of the communication module, and the central control module controls the execution module to execute the adjustment instructions according to the adjustment instructions, so as to adjust the voltage of the rural power grid.

2. The rural power grid voltage monitoring and control device according to claim 1, characterized in that: The central control module uses the STM32 chip as the main chip, and converts the analog signal into a digital signal through an analog-to-digital converter.

3. The rural power grid voltage monitoring and control device according to claim 1, characterized in that: The sensor nodes in the rural power grid are set at both sides of the rural power grid transformer, and the sensors are voltage sensors and current sensors.

4. The rural power grid voltage monitoring and control device according to claim 1, characterized in that: The central control module can send a trigger signal to the thyristors V1 and V2 to switch them from the off state to the on state, thereby achieving infinitely adjustable equivalent value of the inductance.

5. The rural power grid voltage monitoring and control device according to claim 1, characterized in that: The host computer is a tablet computer or a mobile phone.

6. The rural power grid voltage monitoring and control device according to claim 1, characterized in that: The execution module is the motor that controls the on-load switch, and the central control module controls the forward and reverse rotation of the execution module motor and thus controls the gear position of the on-load switch of the rural power grid transformer.

7. The rural power grid voltage monitoring and control device according to claim 1, characterized in that: The communication module is a Lora wireless communication module, and the communication chip is Semtech SX127x.

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