A power quality management device supporting multi-protocol adaptive management

Abstract

This application relates to the field of power quality management technology, and provides a power quality management device supporting multi-protocol adaptive management. The device includes a housing, inside which are a management device, a static var compensator (SVC) module, a smart capacitor module, and an energy storage converter module. The management device includes a control module, a carrier module, a communication module, and a power supply module. The communication module includes an RS485 communication module and an Ethernet communication module. The control module connects to the SVC module, smart capacitor module, and energy storage converter module via the RS485 communication module, connects to the local master station or the next-level power quality management device via the Ethernet communication module, and wirelessly communicates with the cloud master station via the carrier module. This application uses multiple communication methods to achieve communication between the power quality management device and the master station or the next-level power quality management device. The choice of communication methods is flexible, and the parallel use of multiple methods enhances communication reliability and reduces the probability of communication interruption.

Description

Technical Field

[0001] This application belongs to the field of power quality management technology, specifically relating to a power quality management device that supports multi-protocol adaptive management. Background Technology

[0002] With the rapid development of smart grids and new energy technologies, modern power systems are undergoing a profound transformation from unidirectional power supply to a multi-interactive mode. In power grids with a distributed energy penetration rate exceeding 35%, power quality problems exhibit new characteristics such as nonlinearity and multi-source coupling. Power quality management devices have emerged to address these issues, typically using energy storage converters.

[0003] A power management device combining PCS and static var compensator can effectively perform power smoothing and reactive power compensation when photovoltaic and wind power are connected to the grid.

[0004] In distributed power grids, existing power management devices suffer from problems such as limited communication methods, insufficient stability, and easy communication interruptions. At the same time, the power supply mode is also relatively simple, and data upload is interrupted when power is lost, affecting the timeliness of data upload. Summary of the Invention

[0005] This application provides a power quality management device that supports multi-protocol adaptive management to solve or partially solve the problems mentioned in the background art.

[0006] This application provides a power quality management device that supports multi-protocol adaptive management, including a cabinet, and the cabinet is equipped with a management device, a static var compensation module, a smart capacitor module, and an energy storage converter module.

[0007] The management device includes a control module, a carrier module, a communication module, and a power module. The communication module includes an RS485 communication module and an Ethernet communication module.

[0008] The control module is connected to the static var compensator module, the intelligent capacitor module, and the energy storage converter module via an RS485 communication module, to the local master station or the next-level power management device via an Ethernet communication module, and to the cloud master station via a carrier module.

[0009] Preferably, the power module includes a power management circuit, the input of which is connected to an AC / DC module and a lithium battery management circuit, and its output is connected to a DC / DC module.

[0010] Preferably, the AC / DC module inputs AC220V and outputs DC12V; the lithium battery management circuit outputs DC12V, and the DC / DC module outputs DC12V.

[0011] Preferably, the AC sampling circuit of the static var compensator circuit includes two sampling resistors connected in series to the current transformer (CT), the two sampling resistors are connected in parallel to a first filter component, the first filter component includes a first capacitor connected in parallel with the two sampling resistors, and the two sampling resistors are connected in parallel to an LC filter circuit.

[0012] Preferably, the temperature drift coefficient of the sampling resistor is less than 25 PPM.

[0013] Preferably, in:

[0014] The outer side of the box is provided with several ventilation openings, and the inner wall of the ventilation openings is provided with a filter screen.

[0015] Preferably, the inside of the housing is provided with a wire channel.

[0016] Preferably, the power management device further includes a surge arrester installed on the side wall of the enclosure.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] (1) This application is equipped with RS485, Ethernet and carrier communication modules to complete the communication between the power management device and the main station or the next-level power management device in multiple communication methods. The communication method selection is flexible and multiple methods in parallel enhance the reliability of communication and reduce the probability of communication interruption.

[0019] (2) The power module of this application provides two power supply methods: AC power supply and battery power supply, which are adapted to the actual situation of distributed power grid and are conducive to timely data upload when AC power fails. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the system composition of this application.

[0022] Figure 2 This is a schematic diagram of the device structure of this application.

[0023] Figure 3 This is a schematic diagram of the power module circuit of this application.

[0024] Figure 4 This is a schematic diagram of the AC sampling circuit of the static var compensator module of this application.

[0025] In the picture:

[0026] 1. Enclosure; 2. Management device; 3. Energy storage converter module; 4. Static var compensator module; 5. Surge arrester; 6. Intelligent capacitor module. Detailed Implementation

[0027] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0028] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Example 1

[0031] like Figures 1 to 4 As shown, this application provides a power quality management device supporting multi-protocol adaptive management, including a housing 1. The housing 1 is equipped with a management device 2, a static var compensator module 4, a smart capacitor module 6, and an energy storage converter module 3. The management device 2 includes a control module, a carrier module, a communication module, and a power supply module. The communication module includes an RS485 communication module and an Ethernet communication module. The control module is connected to the static var compensator module 4, the smart capacitor module 6, and the energy storage converter module 3 through the RS485 communication module, and is connected to the local master station or the next-level power quality management device through the Ethernet communication module. It also communicates wirelessly with the cloud master station through the carrier module.

[0032] like Figure 1As shown, the control module of the management device 1 collects data and controls the static var compensator module 4, the intelligent capacitor module 6, and the energy storage converter module 3 via an RS485 communication module. It connects to the local master station or the next-level power management device via an Ethernet communication module to upload data or receive control commands. It also communicates wirelessly with the cloud master station via a carrier module to upload data or receive control commands. The power management device communicates with the master station or the next-level power management device through multiple communication methods. The flexible selection of communication methods and the parallel use of multiple methods enhance the reliability of communication and reduce the probability of communication interruption.

[0033] Specifically, such as Figure 3 As shown, the power module includes a power management circuit. The input terminals of the power management circuit are connected to the AC / DC module and the lithium battery management circuit, respectively, and its output terminal is connected to the DC / DC module.

[0034] Furthermore, the AC / DC module inputs AC220V and outputs DC12V; the lithium battery management circuit outputs DC12V, and the DC / DC module outputs DC12V.

[0035] Specifically, the AC power supply is provided by the low-voltage 220V AC mains power on the secondary side of the distribution transformer. Under normal circumstances, the 220V AC power is converted into 12V DC power after passing through the AC / DC module. This DC power is then sent to the DC / DC converter via the power management circuit to obtain +12V power for use as the power supply for other modules. When the mains power fails or the AC power is interrupted, the power unit's management circuit will automatically activate the lithium battery as the power supply to ensure that the management device can continue to work normally for 3 minutes.

[0036] Specifically, the AC sampling circuit of the static var compensator module includes two sampling resistors connected in series to the CT, the two sampling resistors are connected in parallel to a first filter component, the first filter component includes a first capacitor connected in parallel with the two sampling resistors, and the two sampling resistors are connected in parallel to an LC filter circuit.

[0037] like Figure 4 As shown, the current signal output by the CT is converted into a voltage signal by two sampling resistors. The two series-connected sampling resistors form a differential voltage signal. Preferably, the sampling resistors are resistors with a temperature drift coefficient of less than 25PPM to ensure that the sampling accuracy requirements are met across the entire operating temperature range. This differential signal has strong anti-interference capability and can be used for sampling by subsequent sampling circuits. The first capacitor connected in parallel with the two sampling resistors can filter high-frequency voltage interference, further improving the stability of the sampling source signal. Before being input to the subsequent sampling circuit, the differential signal passes through an LC low-pass circuit for a second high-frequency signal filtering. Through this signal conditioning circuit, the consistency and accuracy of the sampled values ​​are guaranteed.

[0038] Preferably, such as Figure 1 As shown, the outer side of the housing 1 is provided with several ventilation openings, and the inner wall of the ventilation openings is provided with a filter screen. The ventilation openings effectively improve the heat flow rate of the equipment modules inside the housing, ensuring that the equipment has good heat dissipation conditions; the filter screen can also be used to prevent dust and reduce the possibility of external impurities entering.

[0039] Preferably, the housing 1 is provided with a wire trough, and the communication line and power supply line of the device are placed in the wire trough.

[0040] Preferably, the power management device further includes a surge arrester installed on the side wall of the enclosure 1 to enhance the safety of the equipment when deployed outdoors.

[0041] Specifically, the controller is a microcontroller or other industrial computer.

[0042] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A power quality conditioning device supporting multi-protocol adaptive management comprising a cabinet (1), characterized in that: The enclosure (1) is equipped with a management device (2), a static var compensation module (4), a smart capacitor module (6), and an energy storage converter module (3). The management device (2) includes a control module, a carrier module, a communication module, and a power module. The communication module includes an RS485 communication module and an Ethernet communication module. The control module is connected to the static var compensator module (4), the intelligent capacitor module (6), and the energy storage converter module (3) via an RS485 communication module, and is connected to the local master station or the next-level power management device via an Ethernet communication module, and communicates wirelessly with the cloud master station via a carrier module.

2. The power quality management device supporting multi-protocol adaptive management according to claim 1, characterized in that: The power module includes a power management circuit, the input of which is connected to an AC / DC module and a lithium battery management circuit, and its output is connected to a DC / DC module.

3. The power quality management device supporting multi-protocol adaptive management according to claim 2, characterized in that: The AC / DC module takes AC220V as input and outputs DC12V; the lithium battery management circuit outputs DC12V, and the DC / DC module outputs DC12V.

4. A power quality management device supporting multi-protocol adaptive management according to claim 1, characterized in that: The AC sampling circuit of the static var compensator (4) includes two sampling resistors connected in series to the CT. The two sampling resistors are connected in parallel to the first filter component. The first filter component includes a first capacitor connected in parallel with the two sampling resistors. The two sampling resistors are connected in parallel to the LC filter circuit.

5. A power quality management device supporting multi-protocol adaptive management according to claim 4, characterized in that: The temperature drift coefficient of the sampling resistor is less than 25 PPM.

6. A power quality management device supporting multi-protocol adaptive management according to claim 1, characterized in that: The outer side of the box (1) is provided with several ventilation openings, and the inner wall of the ventilation openings is provided with a filter screen.

7. A power quality management device supporting multi-protocol adaptive management according to claim 1, characterized in that: The box (1) has a wire groove inside.

8. A power quality management device supporting multi-protocol adaptive management according to claim 1, characterized in that: The power management device also includes a surge arrester installed on the side wall of the enclosure (1).

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