A voltage stabilizer applied to power transmission

Abstract

The utility model discloses a kind of voltage stabilizers applied to power transmission, it is related to power electronics equipment technical field, including: voltage sampling module, configured to collect the input voltage signal and output voltage signal of power transmission line, output sampling voltage;Signal conditioning module, configured to receive the sampling voltage, after filtering, amplification processing, output standard voltage signal;Double-path comparison module, including first comparison unit and second comparison unit, the first comparison unit receives input side standard voltage signal and preset input voltage threshold, and output input voltage deviation signal;The second comparison unit receives output side standard voltage signal and reference voltage. Input side and output side voltage are detected respectively using double-path comparison module, while combining hierarchical compensation module, according to the deviation amplitude adaptive starting compensation unit, make voltage response time shorten to 10ms or less, greatly improve the response capability to load mutation.

Description

Technical Field

[0001] This utility model relates to the field of power electronic equipment technology, and in particular to a voltage regulator used in power transmission. Background Technology

[0002] In modern society, electricity, as a core energy source, widely supports various key areas such as industrial production, commercial operations, and daily life. The stable operation of the power transmission system is directly related to the orderly development of the social economy and the normal order of people's lives. However, in the actual power transmission process, voltage fluctuations have always been an important factor affecting the quality of power supply. The causes of voltage fluctuations are complex and diverse, and they can bring a series of adverse effects to the power system and electrical equipment.

[0003] From the perspective of the sources of voltage fluctuations, on the one hand, load changes in the power system are one of the main causes. In industrial production scenarios, the start-up and shutdown of high-power electrical equipment such as large motors and electric arc furnaces are extremely frequent. These devices generate huge inrush currents at the moment of startup, causing a sharp increase in the grid load in a short period of time, which in turn leads to a significant voltage drop; when the equipment stops running, the load decreases rapidly, causing a sudden increase in voltage. For example, the load of large steelmaking electric arc furnaces in metallurgical enterprises changes drastically with the smelting stage, causing voltage fluctuations of more than ±15% in the surrounding area's power grid. On the other hand, the impedance characteristics of power transmission lines also exacerbate voltage fluctuations. During long-distance transmission, the voltage drop caused by line resistance changes dynamically with the transmission current. Especially during peak electricity consumption periods, line voltage loss increases significantly, resulting in lower voltage at the end-user level.

[0004] Voltage fluctuations not only affect the normal operation of industrial production equipment, causing problems such as decreased precision in machined products and production line shutdowns, but also shorten the lifespan of household appliances and even cause safety hazards such as appliance burnout. Existing power transmission voltage regulators mostly adopt traditional electromagnetic voltage regulation or single-feedback linear voltage regulation structures, which have drawbacks such as slow response speed (typically greater than 50ms), low voltage regulation accuracy (output voltage error greater than ±3%), and inability to adaptively match load fluctuations. These shortcomings make it difficult to meet the high requirements of modern power transmission systems for stable voltage control. Therefore, there is an urgent need for a power transmission voltage regulator that can quickly respond to load changes and provide high-precision stable output voltage. Utility Model Content

[0005] The purpose of this invention is to provide a voltage regulator for power transmission to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: including: The voltage sampling module is configured to collect the input voltage signal and output voltage signal of the power transmission line and output the sampled voltage. The signal conditioning module is configured to receive the sampled voltage, filter and amplify it, and then output a standard voltage signal. The dual-channel comparison module includes a first comparison unit and a second comparison unit. The first comparison unit receives an input-side standard voltage signal and a preset input voltage threshold, and outputs an input voltage deviation signal. The second comparison unit receives an output-side standard voltage signal and a reference voltage, and outputs an output voltage deviation signal. The graded compensation module is configured to receive the input voltage deviation signal and the output voltage deviation signal, and control different numbers of compensation units to start according to the amplitude level of the deviation signal, and output compensation voltage. The voltage regulation execution module is configured to receive the compensation voltage and regulate the output voltage of the power transmission line. The reference voltage generation module is configured to provide a stable reference voltage to the dual-channel comparison module; The protection module is configured to detect input voltage overvoltage and overcurrent signals. When the detected value exceeds a preset threshold, it outputs a protection control signal to the voltage regulation execution module to cut off the output circuit. The display module is configured to display the values ​​of input voltage, output voltage, and compensation voltage in real time.

[0007] Preferably, the voltage sampling module includes an input-side sampling unit and an output-side sampling unit. The input-side sampling unit consists of resistors R1 and R2 connected in series. One end of resistor R1 is connected to the input terminal of the power transmission line, and one end of resistor R2 is grounded. The connection point of resistors R1 and R2 outputs the input-side sampling voltage. The output-side sampling unit consists of resistors R3 and R4 connected in series. One end of resistor R3 is connected to the output terminal of the power transmission line, and one end of resistor R4 is grounded. The connection point of resistors R3 and R4 outputs the output-side sampling voltage.

[0008] Preferably, the signal conditioning module includes an RC filter circuit and an operational amplifier circuit connected in sequence. The RC filter circuit consists of a capacitor C1 and a resistor R5. One end of the capacitor C1 is connected to the sampling voltage output terminal, and the other end is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the non-inverting input terminal of the operational amplifier. The inverting input terminal of the operational amplifier is grounded through a resistor R6 and connected to the output terminal of the operational amplifier through a resistor R7, forming a negative feedback amplification structure.

[0009] Preferably, the graded compensation module includes a compensation unit array and a compensation control unit. The compensation unit array consists of multiple parallel DC-DC converters. The input terminal of each DC-DC converter is connected to an auxiliary power supply, and the output terminal is connected to a voltage regulation execution module. The compensation control unit receives a voltage deviation signal and divides it into three levels according to the deviation amplitude. When the deviation value is less than 5%, one compensation unit is activated; when the deviation value is 5%-10%, two compensation units are activated; and when the deviation value is greater than 10%, all three compensation units are activated.

[0010] Preferably, the voltage regulation execution module includes an autotransformer and a bidirectional thyristor. The input terminal of the autotransformer is connected to the input terminal of the power transmission line, and the output terminal is connected to the output terminal of the power transmission line. The control electrode of the bidirectional thyristor is connected to the output terminal of the graded compensation module, and the anode and cathode are respectively connected to different taps of the autotransformer. The turns ratio of the autotransformer is controlled by the conduction of the bidirectional thyristor.

[0011] Preferably, the reference voltage generation module includes a reference voltage chip TL431, resistors R8 and R9. The cathode of the reference voltage chip TL431 is connected to the power supply VCC through resistor R8, the anode is grounded, and the reference electrode is connected to its own cathode through resistor R9. At the same time, it outputs a reference voltage to the dual-channel comparison module.

[0012] Preferably, the protection module includes an overvoltage detection unit and an overcurrent detection unit. The overvoltage detection unit consists of a Zener diode D1 and an optocoupler U1. The anode of the Zener diode D1 is connected to the input voltage sampling terminal, and the cathode is connected to the input terminal of the optocoupler U1. The output terminal of the optocoupler U1 outputs an overvoltage protection signal. The overcurrent detection unit consists of a current transformer CT1 and a rectifier bridge D2. The primary side of the current transformer CT1 is connected in series in the power transmission line, and the secondary side is connected to the input terminal of the rectifier bridge D2. The output terminal of the rectifier bridge D2 outputs an overcurrent protection signal.

[0013] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, its main features are: This device uses a dual-channel comparison module to detect the input and output voltages respectively. At the same time, it combines a graded compensation module to adaptively activate the compensation unit according to the deviation amplitude, which shortens the voltage response time to less than 10ms and greatly improves the ability to cope with load changes. By using the filtering and amplification processing of the signal conditioning module, and in conjunction with the high-precision reference voltage generation module, the output voltage error is controlled within ±1%, thereby improving the voltage regulation accuracy. Integrating overvoltage and overcurrent protection functions with real-time display, it not only ensures the safe operation of the equipment, but also makes it convenient for maintenance personnel to monitor the voltage status in real time, thereby improving the practicality and reliability of the equipment.

[0014] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a block diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the circuit structure of the voltage sampling module and the signal conditioning module in this utility model.

[0016] Figure 1 The components are as follows: 1. Voltage sampling module; 2. Signal conditioning module; 3. Dual-channel comparison module; 31. First comparison unit; 32. Second comparison unit; 4. Graded compensation module; 5. Voltage regulation execution module; 6. Reference voltage generation module; 7. Protection module; 8. Display module.

[0017] Figure 2 In the diagram: R1, R2, input sampling resistors; R3, R4, output sampling resistors; C1, filter capacitor; R5, R6, R7, amplifier circuit resistors; U2, operational amplifier.

[0018] U3, Compensation control unit; U4, U5, U6, DC-DC converter; T1, Autotransformer; VS, Bidirectional thyristor; R10, Current limiting resistor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] like Figure 1As shown, a voltage regulator for power transmission includes a voltage sampling module 1, a signal conditioning module 2, a dual-channel comparison module 3, a graded compensation module 4, a voltage regulation execution module 5, a reference voltage generation module 6, a protection module 7, and a display module 8. The voltage sampling module 1 collects input and output voltage signals, processes them through the signal conditioning module 2, and transmits them to the dual-channel comparison module 3. The dual-channel comparison module 3 compares the processed signal with a preset threshold and a reference voltage, outputting a deviation signal to the graded compensation module 4. The graded compensation module 4 controls the compensation unit to start based on the deviation amplitude, and adjusts the output voltage through the voltage regulation execution module 5. The reference voltage generation module 6 provides a stable reference voltage. The protection module 7 implements overvoltage and overcurrent protection. The display module 8 displays voltage parameters in real time.

[0022] like Figure 2 As shown, the input sampling unit of voltage sampling module 1 consists of resistors R1 (100kΩ) and R2 (10kΩ), which divides the 220V input voltage to output a 20V sampling voltage; the output sampling unit consists of resistors R3 (100kΩ) and R4 (10kΩ), which divides and samples the output voltage. In the RC filter circuit of signal conditioning module 2, capacitor C1 (0.1μF) and resistor R5 (10kΩ) filter out high-frequency interference in the sampling voltage; operational amplifier U2 (model LM324) and resistors R6 (10kΩ) and R7 (100kΩ) form a 10x amplification circuit, which amplifies the 20V sampling voltage to a 200V standard voltage signal to meet the input requirements of the subsequent comparison module.

[0023] The compensation control unit U3 (model STM32F103) of the graded compensation module 4 receives the voltage deviation signal. When the deviation value is less than 5%, it controls the DC-DC converter U4 (model MP2307) to start and output a 5V compensation voltage; when the deviation value is 5%-10%, it controls U4 and U5 to start and output a 10V compensation voltage; when the deviation value is greater than 10%, it controls U4, U5, and U6 to start simultaneously and output a 15V compensation voltage. The autotransformer T1 (turn ratio 1:0.8-1.2) of the voltage regulation execution module 5 controls the tap switching through the bidirectional thyristor VS (model BTA40). The control electrode of the bidirectional thyristor VS is connected to the output terminal of the compensation control unit U3 through the current limiting resistor R10 (1kΩ). The turns ratio of the autotransformer is adjusted according to the compensation voltage to achieve stable control of the output voltage.

[0024] In the reference voltage generation module 6, the reference voltage chip TL431, along with resistors R8 (1kΩ) and R9 (1kΩ), constitutes a 2.5V reference voltage source, providing a stable reference voltage for the dual-channel comparison module 3. In the protection module 7, the Zener diode D1 (model 1N4744, regulated voltage 24V) breaks down when the input voltage sampling value exceeds 24V, triggering the optocoupler U1 (model PC817) to output an overvoltage protection signal. The current transformer CT1 (turn ratio 100:5) and the rectifier bridge D2 (model KBPC4010) convert the line current into a DC voltage signal. When the current exceeds the rated value, an overcurrent protection signal is output. This protection signal is transmitted to the voltage regulation execution module 5, which cuts off the bidirectional thyristor VS, stopping the output. The LCD1602 liquid crystal display screen of the display module 8 is connected to the compensation control unit U3 via an I2C interface, displaying the input voltage (range 0-300V), output voltage (range 0-300V), and compensation voltage (range 0-20V) in real time, with a refresh rate of 1Hz.

[0025] In use, this voltage regulator is connected in series in the power transmission line. The voltage sampling module 1 collects the input and output voltages in real time, and after signal conditioning, transmits them to the dual-channel comparison module 3. The dual-channel comparison module 3 compares the input standard voltage signal with a preset threshold of 220V and outputs an input voltage deviation signal. At the same time, it compares the output standard voltage signal with a 220V reference voltage and outputs an output voltage deviation signal. The graded compensation module 4 activates the corresponding number of compensation units according to the amplitude of the deviation signal. The voltage regulation execution module 5 adjusts the turns ratio of the autotransformer to achieve output voltage stability. The protection module 7 cuts off the output in the event of overvoltage or overcurrent faults to ensure line safety. The display module 8 displays the voltage parameters in real time for convenient operation and maintenance monitoring.

[0026] This invention effectively solves the problems of slow response and low accuracy of existing voltage regulators through dual-path detection and graded compensation design. It can be widely used in industrial power transmission, residential power distribution and other scenarios, and is especially suitable for industries such as metallurgy and manufacturing with frequent load fluctuations.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A voltage regulator for power transmission, characterized in that, include: The voltage sampling module is configured to collect the input voltage signal and output voltage signal of the power transmission line and output the sampled voltage. The signal conditioning module is configured to receive the sampled voltage, filter and amplify it, and then output a standard voltage signal. The dual-channel comparison module includes a first comparison unit and a second comparison unit. The first comparison unit receives an input-side standard voltage signal and a preset input voltage threshold, and outputs an input voltage deviation signal. The second comparison unit receives an output-side standard voltage signal and a reference voltage, and outputs an output voltage deviation signal. The graded compensation module is configured to receive the input voltage deviation signal and the output voltage deviation signal, and control different numbers of compensation units to start according to the amplitude level of the deviation signal, and output compensation voltage. The voltage regulation execution module is configured to receive the compensation voltage and regulate the output voltage of the power transmission line. The reference voltage generation module is configured to provide a stable reference voltage to the dual-channel comparison module; The protection module is configured to detect input voltage overvoltage and overcurrent signals. When the detected value exceeds a preset threshold, it outputs a protection control signal to the voltage regulation execution module to cut off the output circuit. The display module is configured to display the values ​​of input voltage, output voltage, and compensation voltage in real time.

2. The voltage regulator for power transmission according to claim 1, characterized in that: The voltage sampling module includes an input-side sampling unit and an output-side sampling unit. The input-side sampling unit consists of resistors R1 and R2 connected in series. One end of resistor R1 is connected to the input terminal of the power transmission line, and one end of resistor R2 is grounded. The connection point of resistors R1 and R2 outputs the input-side sampling voltage. The output-side sampling unit consists of resistors R3 and R4 connected in series. One end of resistor R3 is connected to the output terminal of the power transmission line, and one end of resistor R4 is grounded. The connection point of resistors R3 and R4 outputs the output-side sampling voltage.

3. The voltage regulator for power transmission according to claim 1, characterized in that: The signal conditioning module includes an RC filter circuit and an operational amplifier circuit connected in sequence. The RC filter circuit consists of a capacitor C1 and a resistor R5. One end of the capacitor C1 is connected to the sampling voltage output terminal, and the other end is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the non-inverting input terminal of the operational amplifier. The inverting input terminal of the operational amplifier is grounded through a resistor R6, and is also connected to the output terminal of the operational amplifier through a resistor R7, forming a negative feedback amplification structure.

4. The voltage regulator for power transmission according to claim 1, characterized in that: The graded compensation module includes a compensation unit array and a compensation control unit. The compensation unit array consists of multiple parallel DC-DC converters. The input of each DC-DC converter is connected to an auxiliary power supply, and the output is connected to a voltage regulation execution module. The compensation control unit receives a voltage deviation signal and divides it into three levels according to the deviation amplitude. When the deviation value is less than 5%, one compensation unit is activated; when the deviation value is 5%-10%, two compensation units are activated; and when the deviation value is greater than 10%, all three compensation units are activated.

5. The voltage regulator for power transmission according to claim 4, characterized in that: The voltage regulation execution module includes an autotransformer and a bidirectional thyristor. The input terminal of the autotransformer is connected to the input terminal of the power transmission line, and the output terminal is connected to the output terminal of the power transmission line. The control electrode of the bidirectional thyristor is connected to the output terminal of the graded compensation module, and the anode and cathode are respectively connected to different taps of the autotransformer. The turns ratio of the autotransformer is controlled by the conduction of the bidirectional thyristor.

6. The voltage regulator for power transmission according to claim 1, wherein: The reference voltage generation module includes a reference voltage chip TL431, resistors R8 and R9. The cathode of the reference voltage chip TL431 is connected to the power supply VCC through resistor R8, the anode is grounded, and the reference electrode is connected to its own cathode through resistor R9. At the same time, it outputs a reference voltage to the dual-channel comparison module.

7. The voltage regulator for power transmission according to claim 1, wherein: The protection module includes an overvoltage detection unit and an overcurrent detection unit. The overvoltage detection unit consists of a Zener diode D1 and an optocoupler U1. The anode of the Zener diode D1 is connected to the input voltage sampling terminal, and the cathode is connected to the input terminal of the optocoupler U1. The output terminal of the optocoupler U1 outputs an overvoltage protection signal. The overcurrent detection unit consists of a current transformer CT1 and a rectifier bridge D2. The primary side of the current transformer CT1 is connected in series in the power transmission line, and the secondary side is connected to the input terminal of the rectifier bridge D2. The output terminal of the rectifier bridge D2 outputs an overcurrent protection signal.

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