Substation high-low voltage control monitoring system

Abstract

The utility model discloses a transformer station high-low voltage control monitoring system, which relates to the technical field of transformer station high-low voltage control monitoring and comprises a data acquisition and transmission module and a data control and display module which are used for acquiring data of a transformer station. The data acquisition module acquires alternating current data, direct current data and switching values of the transformer substation in real time, and transmits the acquired data to the data processing module through the data communication module; an advanced automatic control system is adopted, the state of the transformer substation, the operation condition of equipment and the like can be monitored in real time, remote monitoring and management are carried out through the Internet, real-time monitoring and remote operation of the transformer substation are achieved, field inspection by personnel is not needed, and the operation efficiency and the response speed of the transformer substation are improved; through an integrated fault intelligent diagnosis system, the operation state of equipment is monitored in real time, fault causes are identified through data analysis and a model, fault early warning and rapid positioning are provided, so that repair measures can be taken in time, and the power failure time and the maintenance cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of intelligent control technology for substations, and in particular to a high and low voltage control and monitoring system for substations. Background Technology

[0002] A substation is a location in a power system that transforms voltage and current, receives electrical energy, and distributes it. Substations within power plants are step-up substations, whose function is to step up the voltage of the electrical energy generated by generators before feeding it into the high-voltage power grid.

[0003] As a crucial component of modern power system development, the design and implementation of intelligent substation automation systems have become a focal point for the power industry. With continuous technological advancements, intelligent substations have demonstrated significant advantages in automation level, reliability, and safety.

[0004] Most existing substation control systems are relatively simple and lack a management system specifically designed for substations. This lack of an efficient and targeted management system often leads to uncontrollable factors within substations, causing significant losses and posing safety hazards to substation staff.

[0005] Existing high and low voltage control and monitoring systems use voltage output monitoring modules and fault detection modules to independently monitor and control the output circuits of transformer devices, and perform fault detection on each circuit. Through the cooperation between relay protection modules, circuit breakers, and control switches, the output circuits of transformer devices are controlled. Through the cooperation between voltage output monitoring modules and transformer measurement and control devices, circuit fault detection is achieved, which is beneficial for independent fault protection of circuits and reduces the impact of faulty circuits on other circuits.

[0006] However, it still has many shortcomings in actual use. For example, the existing high and low voltage control and monitoring system has an unreasonable distribution of high and low voltage, which can easily lead to circuit overload or light load. The circuit protection measures are too simple, which is not conducive to rapid fault diagnosis or early prediction of fault location for complex circuits. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a substation high and low voltage control and monitoring system that enables real-time monitoring and remote control of substation high and low voltage, thereby significantly improving operational efficiency.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A substation high and low voltage control and monitoring system includes a data acquisition and transmission module for collecting various data in the substation, and a data control and display module connected to the data acquisition and transmission module.

[0010] The data acquisition and transmission module includes an AC voltage data acquisition unit, a DC voltage data acquisition unit, a switch quantity acquisition unit, a multiplexer, a signal processing module, an analog-to-digital conversion module, and a data communication module.

[0011] The AC voltage data acquisition unit, DC voltage data acquisition unit, and switch quantity acquisition unit are each connected to the signal processing module via a multiplexer, and the signal processing module is connected to the data communication module via an analog-to-digital converter module.

[0012] The data control and display module includes a data transceiver module, a controller module, a circuit protection module, a display module, an input setting module, a clock chip, an alarm circuit, and a power supply module. The data transceiver module is connected to the controller module, and the circuit protection module, display module, input setting module, clock chip, alarm circuit, and power supply module are each connected to the controller module.

[0013] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the signal processing module includes a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, and a voltage divider follower filter circuit; the multiplexer switch is connected to the analog-to-digital converter module in sequence through the sensor signal conditioning circuit, the current signal conditioning circuit, the voltage signal conditioning circuit, and the voltage divider follower filter circuit.

[0014] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the sensor signal conditioning circuit includes an analog signal input terminal, resistors R1 and R2, capacitor C1, and operational amplifier U1. The analog signal input terminal is connected to one end of resistor R1 and one end of resistor R2, the other end of resistor R2 is connected to one end of capacitor C1, the other end of capacitor C1 is connected to the other end of resistor R1 and the positive input terminal of operational amplifier U1, and the negative input terminal of operational amplifier U1 is connected to the output terminal of operational amplifier U1.

[0015] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the voltage signal conditioning circuit includes a voltage signal input terminal, resistors R3, R4, and R5, capacitor C2, and operational amplifier U2. The voltage signal input terminal is connected to one end of resistor R3, the other end of resistor R3 is connected to one end of resistor R4 and one end of resistor R5, the other end of resistor R5 is connected to one end of capacitor C2, the other end of capacitor C2 is connected to the other end of resistor R4 and the positive input terminal of operational amplifier U1, and the negative input terminal of operational amplifier U2 is connected to the output terminal of operational amplifier U2.

[0016] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the voltage divider follower filter circuit includes an operational amplifier U3, resistors R11 and R12, an operational amplifier U4, resistors R13, and a capacitor C7. The output terminal of the operational amplifier U3 is connected to one end of resistor R12, and the other end of resistor R12 is connected to one end of resistor R11 and the positive input terminal of operational amplifier U4. The output terminal of operational amplifier U4 is connected to one end of resistor R13, and the other end of resistor R13 is connected to one end of capacitor C7 and the A / D conversion unit. The other end of capacitor C7 is grounded, and the other end of resistor R11 is connected to the current signal conditioning circuit.

[0017] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the analog-to-digital conversion module adopts an analog-to-digital converter of model AD7794.

[0018] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the chip model of the wireless transceiver module is nRF905.

[0019] As a further preferred embodiment of the high and low voltage control and monitoring system for substations according to this utility model, the display module is a touch screen display module.

[0020] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0021] This utility model discloses a high and low voltage control and monitoring system for substations. It includes a data acquisition and transmission module for collecting various data from the substation, and a data control and display module connected to the data acquisition and transmission module. The system employs AC voltage data acquisition units, DC voltage data acquisition units, and switch quantity acquisition units to collect AC data, DC data, and switch quantities from the substation in real time. The collected data is transmitted to a data processing module via a data communication module. Utilizing an advanced automated control system, it can monitor the substation status and equipment operation in real time. Remote monitoring and management via the internet enable real-time monitoring and remote operation of the substation, eliminating the need for on-site inspections and improving substation operating efficiency and response speed. An integrated intelligent fault diagnosis system monitors equipment operating status in real time and identifies fault causes through data analysis and modeling, providing fault warnings and rapid location to facilitate timely repair measures and reduce power outage time and maintenance costs. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1This is a schematic diagram of the overall structure of a high and low voltage control and monitoring system for a substation according to the present invention.

[0024] Figure 2 This is a schematic diagram of the data acquisition and transmission module of this utility model;

[0025] Figure 3 This is a schematic diagram of the data control and display module of this utility model;

[0026] Figure 4 This is a schematic diagram of the signal processing module of this utility model;

[0027] Figure 5 This is a circuit diagram of the sensor signal conditioning circuit of this utility model;

[0028] Figure 6 This is a circuit diagram of the voltage signal conditioning circuit of this utility model;

[0029] Figure 7 This is the circuit diagram of the voltage divider follower filter circuit of this utility model;

[0030] Figure 8 This is the circuit diagram of the wireless transceiver module of this utility model;

[0031] Figure 9 This is the circuit diagram of the display module of this utility model. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] A substation high and low voltage control and monitoring system, such as Figure 1 As shown, it includes a data acquisition and transmission module for acquiring various data in the substation, and a data control and display module connected to the data acquisition and transmission module;

[0035] like Figure 2 As shown, the data acquisition and transmission module includes an AC voltage data acquisition unit, a DC voltage data acquisition unit, a switch quantity acquisition unit, a multiplexer, a signal processing module, an analog-to-digital conversion module, and a data communication module.

[0036] The AC voltage data acquisition unit, DC voltage data acquisition unit, and switch quantity acquisition unit are each connected to the signal processing module via a multiplexer, and the signal processing module is connected to the data communication module via an analog-to-digital converter module.

[0037] like Figure 3 As shown, the data control and display module includes a data transceiver module, a controller module, a circuit protection module, a display module, an input setting module, a clock chip, an alarm circuit, and a power supply module; the data transceiver module is connected to the controller module, and the circuit protection module, display module, input setting module, clock chip, alarm circuit, and power supply module are respectively connected to the controller module.

[0038] This invention employs an AC voltage data acquisition unit, a DC voltage data acquisition unit, and a switch quantity acquisition unit to collect AC and DC data, as well as switch quantities, from the substation in real time. The collected data is transmitted to the data processing module via a data communication module. It utilizes an advanced automated control system to monitor the substation status and equipment operation in real time. Remote monitoring and management are achieved via the internet, enabling real-time monitoring and remote operation of the substation without the need for on-site inspections, thus improving substation operating efficiency and response speed. Furthermore, an integrated intelligent fault diagnosis system monitors equipment operating status in real time and identifies fault causes through data analysis and modeling, providing fault warnings and rapid location to facilitate timely repair measures and reduce power outage time and maintenance costs.

[0039] like Figure 4 As shown, the signal processing module includes a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit, and a voltage divider follower filter circuit. The multiplexer switch is connected to the analog-to-digital converter module via the sensor signal conditioning circuit, current signal conditioning circuit, voltage signal conditioning circuit, and voltage divider follower filter circuit in sequence. This invention acquires multiple sensor signals, voltage signals, and current signals. The acquired signals are processed sequentially through signal conditioning, analog switching, voltage divider follower, and anti-aliasing filtering. The link establishment time is analyzed, and then a successive approximation AD chip is used for conversion, resulting in higher signal accuracy and greater stability and reliability.

[0040] like Figure 5 As shown, the sensor signal conditioning circuit includes an analog signal input terminal, resistors R1 and R2, capacitor C1, and operational amplifier U1. The analog signal input terminal is connected to one end of resistor R1 and one end of resistor R2, respectively. The other end of resistor R2 is connected to one end of capacitor C1, and the other end of capacitor C1 is connected to the other end of resistor R1 and the positive input terminal of operational amplifier U1. The negative input terminal of operational amplifier U1 is connected to the output terminal of operational amplifier U1.

[0041] As a key component of the conditioning circuit, the operational amplifier is selected from the AD8608 operational amplifier chip of ADI. This chip combines many excellent features, has four rail input and output while being powered by a single power supply, and can ensure high speed while also ensuring extremely low noise and input bias current. It is widely applicable to various circuits.

[0042] Since the input impedance of operational amplifiers is generally very high, they are easily affected by external interference when the input pin is left floating. Therefore, setting resistor R2 can make the input terminal form a loop with the analog ground when the input pin is left floating, thus ensuring the stability of the operational amplifier.

[0043] like Figure 6 As shown, the voltage signal conditioning circuit includes a voltage signal input terminal, resistors R3, R4, and R5, capacitor C2, and operational amplifier U2. The voltage signal input terminal is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R4 and one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C2. The other end of capacitor C2 is connected to the other end of resistor R4 and the positive input terminal of operational amplifier U1. The negative input terminal of operational amplifier U2 is connected to the output terminal of operational amplifier U2.

[0044] In voltage conditioning circuits, rail-to-rail operational amplifiers can maximize the input and output voltage swings to be close to the power supply voltage. However, there is still a large deviation under high current conditions. Since the input voltage range of AD8608 is 0 to 0.5V, a voltage divider circuit is set up with resistors R3 and R5 to reduce the input voltage to below 5V.

[0045] Depending on the magnitude of the current and whether it is AC or DC, the corresponding current acquisition methods vary. Commonly used current acquisition methods include the coaxial shunt method, current transformer method, Rogowski coil method, Hall sensor method, and sampling resistor method. The Hall sensor method is suitable for both AC and DC current measurement and can perform large current measurements. The current signal conditioning circuit uses the Allegro ACS714 chip, which is a current-isolated current sensor with common-mode rejection, composed of a high-precision, low-bias linear Hall sensor.

[0046] The analog switch is controlled by FPGA to select and switch channels to achieve time-division multiplexing. When switching channels, the analog switch will affect the change of capacitive load, resulting in phenomena such as signal oscillation or ringing. The faster the analog switch switches, the more obvious this phenomenon will be. Therefore, the selection of analog switch is particularly important. After analyzing and comparing various types of analog switches, this design adopts the ADG706 chip.

[0047] like Figure 7As shown, the voltage divider follower filter circuit includes operational amplifier U3, resistors R11 and R12, operational amplifier U4, resistor R13, and capacitor C7. The output terminal of operational amplifier U3 is connected to one end of resistor R12. The other end of resistor R12 is connected to one end of resistor R11 and the positive input terminal of operational amplifier U4. The output terminal of operational amplifier U4 is connected to one end of resistor R13. The other end of resistor R13 is connected to one end of capacitor C7 and the A / D conversion unit. The other end of capacitor C7 is grounded. The other end of resistor R11 is connected to the current signal conditioning circuit.

[0048] The signal passes through a voltage divider, follower, and filter circuit after passing through the analog switch, and is then input to the AD converter. The voltage follower enables the circuit to present a high-impedance input and a low-impedance output, improving the circuit's load-driving capability. The operational amplifiers U3 and U4 are based on the AD8031 chip. The maximum sampling current of the ACS714 chip is 5A.

[0049] Preferably, the analog-to-digital converter module uses an AD7794 analog-to-digital converter.

[0050] The chip model of the wireless transceiver module is nRF905.

[0051] like Figure 8 As shown, this utility model's wireless transceiver module uses the nRF905 long-range wireless transceiver chip, which features multiple transmitting points, long transmission distance, and strong anti-interference capabilities. It operates in three ISM bands: 433 / 868 / 915MHz, with a switching time between bands of less than 650µs. Ports such as TRX_CE, PWR_UP, TXEN, CSN, SCK, MISO, and MOSI are connected to the microcontroller. CSN, SCK, MISO, and MOSI form an SPI interface. When transmitting data, the nRF905 is set to transmit mode. The microcontroller writes the receiver address and valid data into the chip's buffer via the SPI interface, then generates a CRC and preamble using the TRX_CE level, and transmits the data. When receiving data, the nRF905 is set to receive mode, waiting for data arrival. Upon receiving the preamble, valid address, and CRC, the data is stored in a register, generating an interrupt that allows the microcontroller to read the data.

[0052] like Figure 9 As shown, the display module is a touch screen display module: the touch screen input and display circuit is composed of a TFT touch LCD screen to form a display control circuit. The amount of condensation in the high-voltage cabinet can be displayed in real time through the LCD screen. For alarm thresholds, users can also set them through touch screen input according to their own requirements.

[0053] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0054] This utility model discloses a high and low voltage control and monitoring system for substations. It includes a data acquisition and transmission module for collecting various data from the substation, and a data control and display module connected to the data acquisition and transmission module. The system employs AC voltage data acquisition units, DC voltage data acquisition units, and switch quantity acquisition units to collect AC data, DC data, and switch quantities from the substation in real time. The collected data is transmitted to a data processing module via a data communication module. Utilizing an advanced automated control system, it can monitor the substation status and equipment operation in real time. Remote monitoring and management via the internet enable real-time monitoring and remote operation of the substation, eliminating the need for on-site inspections and improving substation operating efficiency and response speed. An integrated intelligent fault diagnosis system monitors equipment operating status in real time and identifies fault causes through data analysis and modeling, providing fault warnings and rapid location to facilitate timely repair measures and reduce power outage time and maintenance costs.

[0055] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0056] The above embodiments are merely illustrative of the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of this utility model. The implementation methods of this utility model have been described in detail above, but this utility model is not limited to the above-described implementation methods. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A substation high-low voltage control monitoring system characterized by: The data acquisition and transmission module is used for data acquisition of each data acquisition of a transformer substation, and the data control and display module is connected with the data acquisition and transmission module. The data acquisition and transmission module comprises an alternating current voltage data acquisition unit, a direct current voltage data acquisition unit, a switching value acquisition unit, a multiplexing switch, a signal processing module, an analog-digital conversion module and a data communication module. The alternating current voltage data acquisition unit, the direct current voltage data acquisition unit and the switching value acquisition unit are connected with the signal processing module through the multiplexing switch, and the signal processing module is connected with the data communication module through the analog-digital conversion module. The data control and display module comprises a data transceiver module, a controller module, a circuit protection module, a display module, an input setting module, a clock chip, an alarm circuit and a power module.

2. The substation high-low voltage control monitoring system of claim 1, wherein: The signal processing module comprises a sensor signal conditioning circuit, a current signal conditioning circuit, a voltage signal conditioning circuit and a voltage division follow-up filter circuit.

3. The substation high-low voltage control monitoring system of claim 2, wherein: The sensor signal conditioning circuit comprises an analog signal input end, a resistor R1, a resistor R2, a capacitor C1 and an operational amplifier U1.

4. The substation high-low voltage control monitoring system of claim 2, wherein: The voltage signal conditioning circuit comprises a voltage signal input end, a resistor R3, a resistor R4, a resistor R5, a capacitor C2 and an operational amplifier U2.

5. The substation high-low voltage control monitoring system of claim 2, wherein: The voltage division follow-up filter circuit comprises an operational amplifier U3, a resistor R11, a resistor R12, an operational amplifier U4, a resistor R13 and a capacitor C7.

6. The substation high-low voltage control monitoring system of claim 1, wherein: The analog-digital conversion module adopts an analog-digital converter with a model number of AD7794.

7. The substation high-low voltage control monitoring system of claim 1, wherein: The chip model number of the data communication module is nRF905.

8. The substation high-low voltage control monitoring system of claim 1, wherein: The display module is a touch screen type display module.

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