Active filtering communication system based on configuration screen

Abstract

The utility model relates to an active filtering communication system based on a configuration screen. The active filtering communication system comprises a low-voltage surge protection device, a surge protector, a circuit breaker, a harmonic protector, the configuration screen, a switching power supply, a gateway and a plurality of active filtering treatment modules, 380V three-phase power at a power grid end passes through the circuit breaker, the surge protector and the harmonic protector and then enters a plurality of active filtering treatment modules which are connected in parallel; one path of the power grid end is connected with the configuration screen through the switch, the configuration screen is provided with two paths of RS485 and one path of RS232, the first path of RS485 is directly connected with the active filtering treatment module, the second path of RS485 is connected with the gateway, and the gateway is connected with the platform; and one path of RS232 is connected with the multifunctional network electric power meter through a 232-to-485 module. According to the utility model, the operation state of the whole system can be rapidly and effectively monitored, and remote monitoring and control functions of the whole cabinet system are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to an active filtering communication system based on a configuration screen. Background Art

[0002] In the power system, some equipment generates a large number of harmonics during operation. These harmonics can easily cause parallel resonance or series resonance between the power grid and the compensation capacitor, amplifying the harmonic current several times or even dozens of times, causing overcurrent, damaging the capacitor, the reactor and resistor connected to the capacitor, and even causing serious accidents. To reduce the impact of harmonics, passive filtering devices or active filtering cabinets are usually used. Passive filters have a simple structure and low maintenance and fuel costs, but are generally larger in size, have a smaller filtering range, and have lower overall efficiency. Therefore, active filtering cabinets are commonly used. Although active filtering cabinets have a higher filtering effect, they have the following defects:

[0003] (1) The touch screen of the human-computer interaction system does not intuitively display the effects before and after harmonic control. There are no real-time grid parameters, which is not conducive to users judging the actual situation of the grid after control, affecting the use effect;

[0004] (2) The operating environment of the entire cabinet is not monitored properly, such as the fan temperature and ambient humidity inside the cabinet;

[0005] (3) Remote operability is poor, and it is impossible to connect to the touch screen through the remote platform for operation and maintenance. Summary of the Invention

[0006] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide an active filtering communication system based on a configuration screen to solve the above-mentioned problems.

[0007] The purpose of this utility model is achieved in this way:

[0008] An active filtering communication system based on a configuration panel comprises a low-voltage surge protection device, a surge protector, a circuit breaker, a harmonic protector, a configuration panel, a switching power supply, a gateway, and multiple active filtering management modules. The 380V three-phase power at the grid end is respectively connected to the low-voltage surge protection device and the miniature circuit breaker, then connected to the surge protector via the low-voltage surge protection device, and then connected to the harmonic protector via the circuit breaker. The 380V three-phase power at the grid end enters multiple parallel active filtering management modules after passing through the circuit breaker, the surge protector, and the harmonic protector. A multifunctional network power meter is connected to the grid end incoming line. One line at the grid end is connected to the switching power supply, which is connected to the configuration panel and the 232-to-485 module. The configuration panel is connected to the gateway, and the switching power supply provides 24V power supply for the configuration panel, the 232-to-485 module, and the gateway.

[0009] The configuration screen is equipped with two RS485 channels and one RS232 channel. Based on the MODBUSRTU communication protocol, the first RS485 channel is directly connected to the active filter management module, and the configuration screen issues setting instructions to the active filter management module through this communication port; the second RS485 channel of the configuration screen is connected to the gateway, and the gateway is connected to the platform; the RS232 channel of the configuration screen is connected to the 232-to-485 module, and is connected to the 485 communication port of the multi-function network power meter through the 232-to-485 module.

[0010] Furthermore, the switching power supply is also connected to a wireless temperature measuring device and a 232 to 485 module, and the 232 to 485 module is connected to a temperature and humidity acquisition device.

[0011] Furthermore, the configuration screen is also connected to the 485 communication ports of the temperature and humidity acquisition device and the wireless temperature measuring device respectively through a 232 to 485 module.

[0012] Furthermore, the configuration screen is connected to the 485 communication ports of the multifunctional network power meter, the temperature and humidity acquisition device, and the wireless temperature measuring device respectively through a 232 to 485 module, and the baud rate is set to 9600.

[0013] Furthermore, the baud rate of the first RS485 directly connected to the active filtering management module is set to 115200.

[0014] Furthermore, the temperature and humidity collection device is connected to one end of the power grid.

[0015] Furthermore, the temperature measuring terminal of the wireless temperature measuring device is connected to the ABC three-phase copper plate of the entire cabinet system to monitor the temperature of the copper plate in real time.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model provides an active filtering communication system based on a configuration screen. The system is based on the MODBUS RTU communication protocol and the configuration screen. The configuration screen is provided with two RS485 channels and one RS232 channel. One RS485 channel plus one RS232 channel can quickly and effectively monitor the operating status of the entire system. The second RS485 channel is the data forwarding communication interface of the configuration screen. A communication protocol for data outbound transmission is set in the configuration screen. The gateway collects corresponding parameters from the configuration screen according to this protocol and forwards them to the platform, thereby realizing the remote monitoring and control function of the entire cabinet system.

[0018] The configuration screen of the utility model has a reserved communication interface, which can simultaneously obtain active filtering equipment and other external instruments, such as multi-functional network power meters, temperature and humidity acquisition devices and wireless temperature measuring devices. The configuration screen will display the read instrument values ​​and the collected grid-end values ​​to the user, making it easier for the user to judge the actual situation of the grid end after treatment and to better detect the operating environment. At the same time, the configuration screen receives the collected parameters for real-time display, including values ​​and charts, and the effect is intuitive and clear.

[0019] The utility model efficiently utilizes the communication interface of the configuration screen, and under the premise of not affecting the data update of the active filter module and adopting a higher baud rate for reading, utilizes the reserved 232 communication interface and adopts a lower baud rate suitable for most instruments on the market, thereby better completing the data collection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the active filtering communication system of the present utility model.

[0021] Figure 2 This is a structural diagram of the utility model applied to an active filter cabinet.

[0022] in:

[0023] Low-voltage surge protection device 1, surge protector 2, circuit breaker 3, harmonic protector 4, active filter management module 5, configuration panel 6, 232 to 485 module 7, switching power supply 8, multi-function network power meter 9, temperature and humidity acquisition device 10, wireless temperature measurement device 11, gateway 12. DETAILED DESCRIPTION

[0024] To better understand the technical solution of the present invention, the following detailed description is provided with reference to the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention; they are merely examples of possible implementations of the technical solution of the present invention. It should be noted that the description herein of the positional relationships of the various components, such as component A being located above component B, is based on the relative positions of the components in the illustrations and is not intended to limit the actual positional relationships of the components. Example

[0025] See also Figure 1-Figure 2 , Figure 1A schematic diagram of the internal structure of the present invention is drawn. As shown in the figure, the present invention relates to an active filtering communication system based on a configuration screen, which includes a low-voltage surge protection device 1, a surge protector 2, a circuit breaker 3, a harmonic protector 4, a configuration screen 6, a switching power supply 8, a gateway 12, and multiple active filtering management modules 5. The 380V three-phase power at the grid end is connected to the low-voltage surge protection device 1 and the miniature circuit breaker 3 respectively, and then connected to the surge protector 2 through the low-voltage surge protection device 1, and connected to the harmonic protector 4 through the circuit breaker 3. The 380V three-phase power at the grid end enters multiple parallel active filtering management modules 5 after passing through the circuit breaker 3, the surge protector 2, and the harmonic protector 4. In this embodiment, a maximum of 12 active filtering management modules 5 can be connected in parallel.

[0026] A multifunctional network power meter 9 is connected to the power grid inlet to ensure the accuracy of the detection of power grid electrical parameters.

[0027] One path on the grid side is connected to a switching power supply 8, which is respectively connected to the configuration screen 6, the wireless temperature measuring device 11 and the 232 to 485 module 7. The configuration screen 6 is connected to the gateway 12, and the 232 to 485 module 7 is connected to the temperature and humidity acquisition device 10. Thus, the switching power supply 8 provides 24V power supply for the configuration screen 6, the 232 to 485 module 7, the temperature and humidity acquisition device 10, the wireless temperature measuring device 11 and the gateway 12.

[0028] The configuration screen 6 is provided with two RS485s and one RS232. Based on the MODBUSRTU communication protocol, the first RS485 is directly connected to the active filter management module 5 (active filter device), and the baud rate is set to 115200. The configuration screen 6 can issue setting instructions to the active filter management module 5 through this communication port; the second RS485 of the configuration screen 6 is connected to the gateway 12, and the gateway 12 is connected to the platform.

[0029] One RS232 of the configuration screen 6 is connected to the 232 to 485 module 7, which is connected to the 485 communication ports of the multi-function network power meter 9, the temperature and humidity acquisition device 10, and the wireless temperature measuring device 11 respectively through the 232 to 485 module 7, and the baud rate is set to 9600.

[0030] One path on the grid end is connected to the temperature and humidity acquisition device 10, and the temperature measurement terminal of the wireless temperature measuring device 11 is connected to the ABC three-phase copper plate of the entire cabinet system to monitor the temperature of the copper plate in real time.

[0031] Working principle:

[0032] The utility model relates to an active filtering communication system based on a configuration screen, comprising a circuit breaker, a low-voltage surge protection device, a surge protector, a harmonic protector, a switching power supply, a multifunctional network power meter, a wireless temperature measuring device, a temperature and humidity acquisition device, a 232 to 485 module, a configuration screen and a gateway; the circuit breaker provides a disconnecting function; the surge protector ensures that the system will not be damaged under overvoltage conditions; the harmonic protector can protect various components in the system from harmonic damage, thereby improving the stability of the entire system; the multifunctional network power meter ensures the accuracy of detecting power grid electrical parameters; the temperature measuring terminals of the wireless temperature measuring device are connected to the ABC three-phase copper plates of the entire cabinet system to monitor the temperature of the copper plates in real time; the D temperature and humidity acquisition device is used to collect the real-time temperature and humidity of the environment inside the entire cabinet; the active filtering control module is used to control harmonics and reactive power; the gateway is used to secondary collect parameters in the configuration screen and transmit them to the platform for remote detection.

[0033] The active filtering communication system of the utility model is based on the MODBUS RTU communication protocol, and the configuration screen is provided with two RS485 channels and one RS232 channel.

[0034] The first RS485 is directly connected to the active filter device, and the baud rate is set to 115200. Setting it to the maximum baud rate is to facilitate the configuration screen to quickly refresh and display the parameters in the APF, such as the plot points of the voltage and current curves. The configuration screen can also send setting instructions to the APF through this communication port.

[0035] An RS232 line is connected to the 485 communication ports of the multifunctional network power meter, wireless temperature measurement device, and temperature and humidity acquisition device via a 232-to-485 converter, with the baud rate set to 9600. The multifunctional network power meter can more accurately measure the current electrical parameters of the power grid. The configuration screen displays the meter readings along with the grid-side values ​​collected by the active filter treatment module, allowing the user to easily determine the actual status of the power grid after treatment. If the temperature and humidity collected by the wireless temperature measurement device and the temperature and humidity acquisition device are abnormal (e.g., overheating or excessive humidity in the cabinet), the configuration screen will issue an alarm. The configuration screen also reserves a communication point table to allow for the addition of more instruments or acquisition devices.

[0036] Using one 485 and one 232, without affecting the refresh of APF parameters, it can be better compatible with the communication of other instruments on the market (general instruments do not support the high baud rate of 115200), so as to better carry out data collection work. The configuration screen can quickly and effectively monitor the operating status of the entire system through these two communication channels.

[0037] The second RS485 of the configuration screen is the data forwarding communication interface of the configuration screen. The communication protocol for data outbound transmission is set in the configuration screen. The gateway collects the corresponding parameters from the configuration screen according to this protocol and forwards them to the platform, thereby realizing the remote monitoring and control function of the entire cabinet system.

[0038] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. An active filtering communication system based on a configuration screen, characterized by: It includes a low-voltage surge protection device (1), a surge protector (2), a circuit breaker (3), a harmonic protector (4), a configuration panel (6), a switching power supply (8), a gateway (12) and a plurality of active filtering management modules (5); the 380V three-phase electricity at the grid end is connected to the low-voltage surge protection device (1) and the miniature circuit breaker (3), and is connected to the surge protector (2) through the low-voltage surge protection device (1), and is connected to the harmonic protector (4) through the circuit breaker (3). The 380V three-phase electricity at the grid end is connected to the harmonic protector (4) through the circuit breaker (3). The power supply (3), the surge protector (2) and the harmonic protector (4) then enter into a plurality of parallel active filtering control modules (5); a multifunctional network power meter (9) is connected to the grid-end inlet; one path of the grid-end is connected to a switching power supply (8), the switching power supply (8) is connected to the configuration panel (6) and the 232-to-485 module (7), the configuration panel (6) is connected to the gateway (12), and the switching power supply (8) provides 24V power supply for the configuration panel (6), the 232-to-485 module (7) and the gateway (12); The configuration screen (6) is provided with two RS485 channels and one RS232 channel. Based on the MODBUSRTU communication protocol, the first RS485 channel is directly connected to the active filter management module (5), and the configuration screen (6) issues setting instructions to the active filter management module (5) through this communication port; the second RS485 channel of the configuration screen (6) is connected to the gateway (12), and the gateway (12) is connected to the platform; the RS232 channel of the configuration screen (6) is connected to the 232-to-485 module (7), and is connected to the 485 communication port of the multifunctional network power meter (9) through the 232-to-485 module (7).

2. The active filtering communication system based on the configuration screen according to claim 1, characterized in that: The switching power supply (8) is also connected to a wireless temperature measuring device (11) and a 232 to 485 module (7), and the 232 to 485 module (7) is connected to a temperature and humidity acquisition device (10).

3. The active filtering communication system based on the configuration screen according to claim 2, characterized in that: The configuration screen (6) is also connected to the 485 communication ports of the temperature and humidity acquisition device (10) and the wireless temperature measurement device (11) through the 232 to 485 module (7).

4. The active filtering communication system based on the configuration screen according to claim 3, characterized in that: The configuration screen (6) is connected to the 485 communication ports of the multifunctional network power meter (9), the temperature and humidity acquisition device (10), and the wireless temperature measuring device (11) respectively through the 232 to 485 module (7), and the baud rate is set to 9600.

5. The active filtering communication system based on the configuration screen according to claim 1, characterized in that: The baud rate of the first RS485 directly connected to the active filtering management module (5) is set to 115200.

6. The active filtering communication system based on the configuration screen according to claim 2, characterized in that: The temperature and humidity collection device (10) is connected to one end of the power grid.

7. The active filtering communication system based on the configuration screen according to claim 2, characterized in that: The temperature measuring terminal of the wireless temperature measuring device (11) is connected to the ABC three-phase copper plate of the entire cabinet system to monitor the temperature of the copper plate in real time.

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