An intelligent DC protection measurement and control device

Abstract

This application discloses a DC protection measurement and control device, characterized in that the measurement and control device includes a host module and a liquid crystal module. The host module and the liquid crystal module perform information interaction through a data line or a wireless transceiver module. The host module includes a protection component, a communication component, an input component, an output component, a sampling component, a power supply component, and a digitalization component. Data transmission is carried out between the components through a backplane bus. Among them, the digitalization component provides an interface for accessing the process layer network of a digital substation, so that the measurement and control device can exchange information with other secondary power equipment. With the support of the digitalization module, the rapidity and reliability of information transmission between secondary devices are improved; the function of load dynamic monitoring is available, providing a reference for reasonable load allocation; the adoption of the visual configuration development method improves the development efficiency.

Description

Technical Field

[0001] This application belongs to the technical fields of power systems and rail transit, and particularly relates to an intelligent DC protection measurement and control device. Background Art

[0002] Since the end of the 19th century, AC systems have replaced DC systems and become the mainstream of power supply systems due to advantages such as convenient voltage transformation. However, with the rapid progress of power electronics technology, the gradual increase in the proportion of DC new energy, and the continuous growth of terminal energy-saving requirements, DC power, with its characteristics of low loss and high quality, has received increasing attention in medium and low-voltage power supply systems. It has been successfully applied in many fields such as rail transit traction, ship power supply, and medium and low-voltage distribution networks. As an important part of the DC power supply system, the DC protection measurement and control device provides strong guarantee for the safe and stable operation of the DC power supply system. When the power supply system is operating normally, the DC protection measurement and control device collects and monitors the information of the system in real time and records the system operation status; when the power supply system fails or is abnormal, the DC protection measurement and control device automatically cuts off the faulty equipment from the system within the shortest possible time and the smallest area.

[0003] With the continuous development of technology, new requirements from operators for DC protection measurement and control devices have emerged continuously, and the limitations of traditional DC protection measurement and control devices have become increasingly prominent, mainly reflected in the following aspects:

[0004] 1. In recent years, with the rapid development of computer, robot, and image recognition technologies, the operation and maintenance of power supply systems have been moving towards unmanned and intelligent directions, and DC protection measurement and control devices are also facing an urgent requirement for intelligent transformation. However, the existing DC protection measurement and control devices have a low level of intelligence. For example, the liquid crystal panel only supports manual trigger wake-up, the brightness and font of the liquid crystal panel display are fixed, and the protection measurement and control device cannot be linked with the intelligent operation and maintenance system, etc., and it has been difficult to meet the new requirements of future unmanned and intelligent operation and maintenance.

[0005] 2. In applications in industries such as rail transit and DC distribution networks, there are a large number of digital signals transmitted between DC protection measurement and control devices and other secondary equipment. Traditional signal transmission uses a large number of secondary cables. However, transmitting digital signals through secondary cables not only involves complex wiring but also has low reliability, and may even affect the normal operation of the DC power supply system. For example, since cable channel abnormalities are usually difficult to detect, there is a risk that signals cannot be detected in a timely manner or transmitted when signals are transmitted through cables. At the same time, the transmission distance of electrical signals is limited and the anti-interference ability is poor, resulting in poor stability of electrical signal transmission and possible data reception errors. In a DC system, since there is no zero-crossing point of the fault current, the earlier the fault is removed, the better the protection of primary equipment can be achieved. However, factors such as the relay outlet time and the anti-shake of the input signals cause the DC protection measurement and control device to take a long time to transmit the tripping signal through the secondary cable, which will directly lead to a longer fault removal time and is very unfavorable for the protection of primary equipment. Summary of the Invention

[0006] The purpose of this application is to provide an intelligent DC protection measurement and control device, which can improve the work efficiency of operators, reduce the fault removal time of the DC power supply system, and meet the new requirements put forward by new technologies such as intelligent operation and maintenance by adopting intelligent liquid crystals, digital components, and load monitoring functions.

[0007] To achieve the above purpose, this application provides an intelligent DC protection measurement and control device, characterized in that the measurement and control device includes a host module and a liquid crystal module, and the host module and the liquid crystal module perform information interaction through a data line or a wireless transceiver module.

[0008] The host module includes a protection component, a communication component, an input component, an output component, a sampling component, a power supply component, and a digital component. Data is transmitted between components through a backplane bus.

[0009] Among them, the digital component provides an interface to access the process layer network of a digital substation, so that the measurement and control device can exchange information with other secondary power equipment.

[0010] According to some embodiments, the information exchange includes tripping, breaker position, voltage, and current.

[0011] According to some embodiments, the liquid crystal module supports manual trigger wake-up, human movement detection wake-up, and intelligent operation and maintenance system linkage wake-up.

[0012] According to some embodiments, the liquid crystal module after wake-up can automatically adjust the liquid crystal brightness and the size of the information display according to the ambient light intensity.

[0013] According to some embodiments, the measurement and control device has an intelligent operation and maintenance interface, and accesses a wireless signal transceiver module through the intelligent operation and maintenance interface, so that the measurement and control device can perform information interaction with the intelligent operation and maintenance system.

[0014] According to some embodiments, the intelligent operation and maintenance interface is arranged in the liquid crystal module or the host module.

[0015] According to some embodiments, the sampling component collects the current and voltage of the DC power supply system, and the measurement and control device records the data collected by the sampling component at a set time interval.

[0016] According to some embodiments, the measurement and control device is configured to judge the recorded data according to the overload standard, and when it is determined that there is an overload, an overload warning signal is issued.

[0017] According to some embodiments, the measurement and control device constructs a protection and measurement and control function through a visual software configuration platform.

[0018] According to some embodiments, the visual software configuration platform can simulate the actual working conditions and verify the constructed protection and measurement and control functions.

[0019] The beneficial effects of this application are:

[0020] (1) By adopting an intelligent liquid crystal module, the intelligent DC protection and measurement and control device adds multiple contactless wake-up modes such as human movement detection wake-up and intelligent operation and maintenance system linkage wake-up while retaining the traditional manual trigger wake-up. The awakened liquid crystal module can automatically adjust the display of information according to the on-site environment, improving the friendliness of the human-machine interface.

[0021] (2) Through the configured intelligent operation and maintenance interface, the intelligent DC protection and measurement and control device can be highly integrated into the intelligent operation and maintenance system, providing conditions and possibilities for more advanced applications of intelligent operation and maintenance.

[0022] (3) By accessing the process layer network through digital components, the information of the intelligent DC protection and measurement and control device can be transmitted using the process layer network, reducing the signal transmission channels between secondary devices and ensuring the rapidity and reliability of information transmission.

[0023] (4) With the load dynamic monitoring function, the intelligent DC protection and measurement and control device can track and record the load status of the power supply system, provide reliable load monitoring data, and provide important references for operators to reasonably allocate loads.

[0024] (5) Using the visual software configuration platform, all functions of the intelligent DC protection and measurement and control device can be simulated and verified during the development stage, which can improve the development efficiency and reduce the probability of development errors. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the intelligent DC protection measurement and control device of the present application.

[0026] Figure 2 It is a schematic diagram of the linkage between the intelligent DC protection measurement and control device and the intelligent operation and maintenance system of the present application.

[0027] Figure 3 It is a schematic diagram of the process layer networking of the intelligent DC protection measurement and control device of the present application. Specific implementation manners

[0028] The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

[0029] Embodiment 1

[0030] Figure 1 It is a schematic diagram of the intelligent DC protection measurement and control device. The intelligent DC protection measurement and control device is used for the protection of DC traction and power supply systems, such as Figure 1 shown, including a host module 1 and a liquid crystal module 3. Among them, the host module 1 and the liquid crystal module 3 adopt a split design, which are independent of each other, and information interaction is carried out through a data line 2. In some embodiments, the host module 1 and the liquid crystal module 3 can also use a wireless transceiver module or other methods for data transmission.

[0031] The host module 1 and the liquid crystal module 3 adopt a split design, so that the intelligent DC protection measurement and control device can select two configuration methods of without liquid crystal and with liquid crystal according to the size of the secondary compartment space of the DC switch cabinet. For the intelligent DC protection measurement and control device without liquid crystal, the operation personnel can view the device information through the station integrated automation system or the dispatching system. For the intelligent DC protection measurement and control device with liquid crystal, the information can be viewed through the liquid crystal module 3, and the installation position of the liquid crystal module 3 can be arbitrarily selected.

[0032] The liquid crystal module 3 is an intelligent liquid crystal module with multiple wake-up modes, which supports manual trigger wake-up, human body movement detection wake-up, intelligent operation and maintenance system linkage wake-up, etc. After waking up, the liquid crystal can automatically adjust the liquid crystal brightness and the size of the information display according to the ambient light intensity.

[0033] The host module 1 includes protection components, communication components, input components, output components, sampling components, power supply components, and digital components, etc. The protection components are used to complete the protection operation and functional logic of the intelligent DC protection and measurement and control device. The communication components are used for information interaction between the protection and measurement and control device and external platforms such as the background, dispatching, and debugging software. The input components provide multiple input signals, and all input signals are isolated by optocouplers or magnetic couplers after entering the device. The output components provide multiple output signals, including fast tripping output ports, and output ports in the form of relay dry contacts with optoelectronic isolation, etc. The sampling components collect the current, voltage, etc. of the DC power supply system, and the measurement and control device records the data collected by the sampling components at set time intervals. The power supply components are used to provide working power for the intelligent DC protection and measurement and control device. The digital components provide the interfaces and functions for the protection and measurement and control device to access the intelligent substation.

[0034] Each component in the host module 1 is independent of each other and data is transmitted through the backplane bus. The quantity and type of components can be adjusted according to actual needs. In addition, the functions of multiple components can be separated or combined together.

[0035] The design scheme of integrating multiple components adopted by the host module 1 has the following beneficial effects: on the one hand, the intelligent DC protection and measurement and control device can configure the quantity and type of components according to the actual needs of the project; on the other hand, when a certain component fails, the operation personnel can conveniently replace and test the component.

[0036] The protection and measurement and control functions of the intelligent DC protection and measurement and control device can be constructed through a visual software configuration platform. The visual software configuration platform can also verify the constructed functions, that is, simulate input information according to the actual working conditions, verify the feasibility of the constructed functions, discover the risk points in the functions, give improvement suggestion plans, improve the development efficiency, and reduce the probability of development errors. In some embodiments, the configuration platform can also be implemented through other non-visual software or programming modes.

[0037] Embodiment 2

[0038] The intelligent DC protection and measurement and control device supports an intelligent operation and maintenance interface and can be connected to a wireless signal transceiver module for the interaction between the intelligent DC protection and measurement and control device and the intelligent operation and maintenance system. The intelligent DC protection and measurement and control device can quickly feedback the changes in the DC power supply system to the intelligent operation and maintenance system, and the operation personnel can view the information provided by the intelligent DC protection and measurement and control device through the terminal device of the intelligent operation and maintenance system. The following is a specific description in combination with the attached Figure 2 For specific illustration.

[0039] Figure 2It is a schematic diagram of the linkage between the intelligent DC protection measurement and control device and the intelligent operation and maintenance system 4. The linkage of the intelligent operation and maintenance system means that when the intelligent DC protection measurement and control device operates or an abnormality occurs, a data query request is sent to the intelligent operation and maintenance system 4 through the wireless transceiver module 6 or the data line 2 connected to the intelligent operation and maintenance interface. The intelligent operation and maintenance interface of the intelligent DC protection measurement and control device can be placed in the host module 1 or in the liquid crystal module 3, such as Figure 2 shown. After receiving the query request instruction, the intelligent operation and maintenance system 4 immediately sends a query instruction to the intelligent operation and maintenance terminal (operation and maintenance robot or operation and maintenance camera, etc.) 5 and notifies the operation personnel of the abnormality. The intelligent operation and maintenance terminal 5 records the abnormality information according to the requirements of the operation personnel for the operation personnel to monitor and view.

[0040] Embodiment 3

[0041] Figure 3 It is a schematic diagram of the process layer networking of the intelligent DC protection measurement and control device. The process layer network switch is used to form the process layer network in the substation, and the information sharing between different sites is realized through the cross-station cascading of the process layer network switch. The intelligent DC protection measurement and control device exchanges information such as tripping, breaker position, voltage and current with other secondary power equipment through the process layer network.

[0042] Specifically, the digital component of the DC protection measurement and control device provides an independent interface as an interface component for accessing the process layer network. The digital component can provide multiple independent interfaces. The physical transmission channel between devices in the process layer network uses optical fiber, which can improve the anti-interference ability, transmission distance and transmission capacity of information transmission, ensure the rapidity and reliability of information transmission, and reduce the number of information transmission channels. The IEC61850 protocol used for process layer data transmission has a link break detection mechanism, which can monitor the data transmission channel in real time. Once a channel interruption occurs, corresponding alarm information will be immediately sent out, improving the reliability of data transmission and saving the time and cost invested by operation personnel in the maintenance of secondary equipment. In some embodiments, the connection channel between the intelligent DC protection measurement and control device and the process layer switch uses other media besides optical fiber.

[0043] Embodiment 4

[0044] Such as Figure 1 shown, the host module 1 of the intelligent DC protection measurement and control device includes a sampling component, and the sampling component can collect load information such as current and voltage of the DC power supply system. The measurement and control device can record the load information such as voltage and current of the DC power supply system at a set time interval, draw a load report according to the set time period, and at the same time can judge and send an overload warning signal according to the overload standard.

[0045] In the prior art, an in-station integrated automation system or a dispatching system can obtain the recorded data from the measurement and control device in the way of general call. This application uses the measurement and control device to record the load status of the DC power supply system at set time intervals, solving the problem that the granularity of the load data of the DC power supply system obtained by the in-station integrated automation system and the dispatching system is poor due to the long general call interval, and providing an important reference for the operation personnel to reasonably allocate and dispatch the load in the power supply system.

[0046] In addition, the intelligent DC protection measurement and control device can statistically analyze the recorded load data and draw load reports with daily, monthly, and annual cycles for the operation personnel to query and compare. The intelligent DC protection measurement and control device can also set the load overlimit threshold and time according to the overload standard. When it is monitored that the DC power supply system is in or has been in an overload operation state for a long time, the measurement and control device will send out a warning signal, and the operation personnel can adjust the load in the power supply system according to the actual situation to prevent the DC power supply system from being in or remaining in an overloaded operation state for a long time.

[0047] The above embodiments are only for illustrating the technical idea of this application and cannot be used to limit the protection scope of this application. Any changes made on the basis of the technical solution according to the technical idea proposed in this application fall within the protection scope of this application.

Claims

1. A DC protection measurement and control device, characterized in that, The measurement and control device includes a host module and a liquid crystal module. The host module and the liquid crystal module perform information interaction through a data line or a wireless transceiver module. The host module includes a protection component, a communication component, an input component, an output component, a sampling component, a power supply component, and a digitalization component. Data transmission between components is carried out through a backplane bus. Among them, the sampling component collects the current and voltage of the DC power supply system. The measurement and control device records the data collected by the sampling component at a set time interval. And the measurement and control device is configured to: judge the recorded data according to the overload standard, and when it is determined to be overloaded, send an overload warning signal. The digitalization component provides an interface to access the process layer network of the digital substation, so that the measurement and control device can exchange information with other secondary power equipment. The physical transmission channel between devices in the process layer network uses optical fiber, and the process layer data transmission uses the IEC61850 protocol. The liquid crystal module supports manual trigger wake-up, human movement detection wake-up, and intelligent operation and maintenance system linkage wake-up. The measurement and control device has an intelligent operation and maintenance interface, and accesses a wireless signal transceiver module through the intelligent operation and maintenance interface, so that the measurement and control device can exchange information with the intelligent operation and maintenance system. The measurement and control device constructs protection and measurement and control functions through a visual software configuration platform. The visual software configuration platform can simulate actual working conditions and verify the constructed protection and measurement and control functions.

2. The measurement and control device according to claim 1, characterized in that, The information includes tripping, circuit breaker position, voltage, and current.

3. The measurement and control device according to claim 1, characterized in that, The woken-up liquid crystal module can automatically adjust the liquid crystal brightness and the size of information display according to the ambient light intensity.

4. The measurement and control device according to claim 1, characterized in that, The intelligent operation and maintenance interface is set in the liquid crystal module or the host module.

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