Direct-current monitoring device for open-loop direct-current circuit of distributed energy station

Abstract

The utility model discloses a direct-current monitoring device for an open-loop direct-current circuit of a distributed energy station, and the open-loop direct-current circuit of the distributed energy station comprises two 220V direct-current circuit branches, and the two 220V direct-current circuits pass through a direct-current power distribution room and a high-voltage power distribution room and are connected to a small bus at the top of a screen for power supply. The two 220V direct current circuits are respectively provided with an upper-level switch and a lower-level switch; the system also comprises a monitoring module which is connected with the two 220V DC circuit branches. The monitoring module is used for monitoring a DC load. The superior switch and the subordinate switch in the same branch are in interlocking control through a switch auxiliary contact; a locking unit of the monitoring module adopts different branch subordinate switch opening AND gate logic as a locking condition for judging closing behaviors of different branch subordinate switches. According to the utility model, automatic switching can be realized when the screen top miniature bus loses power, the overall operation condition of associated equipment can be checked in real time, and faults can be found in time.

Description

TECHNICAL FIELD

[0001] The utility model relates to direct current power distribution management technical field, concretely relates to a direct current monitoring device of distributed energy station open loop direct current circuit. BACKGROUND

[0002] With economic development and urbanization process, energy demand is increasingly diversified, users not only need power, but also need heat and cold energy. Distributed energy station can meet multiple energy demand, improve energy utilization efficiency, and optimize management through intelligent control system, at the same time, since direct current power distribution system can directly power various loads, reduce the loss of alternating current-direct current conversion, improve the overall efficiency of the system, therefore, in these energy stations, direct current power distribution system is widely used due to its high efficiency and reliable characteristics.

[0003] And the direct current power distribution system used in the existing distributed energy station often lacks effective monitoring means in the operation process, leading to difficult fault detection and maintenance, secondly, when different power supply branches need to be switched, the current method mainly relies on manual operation, which not only increases the work burden of operating personnel, but also may cause misoperation and safety hazards.

[0004] Therefore, the present application further provides a direct current monitoring device of distributed energy station open loop direct current circuit to solve the above technical problems. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a direct current monitoring device for distributed energy station open loop direct current circuit, which can automatically switch when the screen top small bus loses power, minimize power outage time, send alarm signals to remind operating personnel to check on site, and also collect the switch state and small bus data of two places together, facilitate real-time viewing of the overall operation of associated equipment, timely detect faults, and also can understand the equipment operation status at a glance when using the "power failure" method to find direct current system grounding faults, facilitate quick switch operation, improve fault finding efficiency, eliminate faults as soon as possible, to solve the above technical problems.

[0006] In order to solve the above technical problems, the utility model provides a direct current monitoring device of distributed energy station open loop direct current circuit, wherein the distributed energy station open loop direct current circuit includes two 220V direct current circuit branches, and the two 220V direct current circuits pass through direct current distribution room and high voltage distribution room to access screen top small bus power supply, and the two 220V direct current circuits are provided with upper switch and lower switch, wherein two groups of upper switches are located in direct current distribution room, and two groups of lower switches are located in high voltage distribution room.

[0007] The direct current monitoring device further comprises a monitoring module connected with the two 220V direct current circuit branches, and the monitoring module is used for monitoring the direct current load.

[0008] The upper switch and the lower switch in the same branch are interlocked and controlled through switch auxiliary contact points.

[0009] Further, the monitoring module is located in a direct current distribution room and is composed of the following units:

[0010] The acquisition unit is connected with two groups of upper switches and two groups of lower switches through switch auxiliary contact points and is connected with a top busbar through a busbar voltage connection screen, and is used for acquiring switch quantity and analog quantity data.

[0011] The display unit is provided in two groups and is located in the direct current distribution room and the high-voltage distribution room respectively for data display.

[0012] The logic unit is provided as a CPU logic processor and is connected with the display unit, the acquisition unit, the output unit and the locking unit through a bus buffer.

[0013] The output unit is used for switch quantity output and alarm signal.

[0014] The locking unit is used for switching and locking between lower switches of different branches.

[0015] The locking unit adopts different branch lower switch split bit AND gate logic as a locking condition for judging the closing behavior of different branch lower switches.

[0016] Further, the logic unit is connected with an EEPROM memory, an SDROM memory and a NORFLASH flash memory.

[0017] Further, the display unit comprises a display controller, a display, a NANDFLASH flash memory and a VRAM memory.

[0018] Further, a 220V direct current I section busbar is located in a direct current distribution room, a branch I upper switch is located in a 220V direct current I section No. 1 cabinet in the direct current distribution room and can only be manually operated, a switch auxiliary contact point is connected with the monitoring module, and a branch I lower switch is located in a 10kV high-voltage distribution cabinet No. 1 cabinet in a high-voltage distribution room and can be remotely and electrically operated, and a switch auxiliary contact point is connected with the monitoring module.

[0019] Further, a 220V direct current II section busbar is located in a direct current distribution room, a branch II upper switch is located in a 220V direct current II section No. 2 cabinet in the direct current distribution room and can only be manually operated, a switch auxiliary contact point is connected with the monitoring module, and a branch II lower switch is located in a 10kV high-voltage distribution cabinet No. 2 cabinet in a high-voltage distribution room and can be remotely and electrically operated, and a switch auxiliary contact point is connected with the monitoring module.

[0020] Further, the screen top small bus, in the high voltage distribution room 10kV high voltage distribution cabinet top, bus voltage access monitoring module.

[0021] The beneficial effects of the utility model lie in:

[0022] 1. The monitoring device of the utility model sets up monitoring module, utilizes the acquisition of on-off value and analog quantity data, can monitor the DC load not in the same place, and is convenient for checking the equipment operation and finding the fault in time.

[0023] 2. The utility model is for the ring power supply mode of two different DC systems, on the basis of only manual power-off, adds two power automatic switching modes, can prevent closed loop operation, and can reduce the power-off time and improve the DC system power supply reliability.

[0024] 3. The utility model greatly shortens the time of checking the equipment operation when finding the DC system grounding fault, and is convenient for quickly finding the fault point.

[0025] 4. The utility model can automatically switch when the screen top small bus loses power, reduce the power-off time as much as possible, and also concentrate the switch state and small bus data of two places together, is convenient for checking the overall operation of associated equipment in real time, and finds the fault in time. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification provide further understanding of the utility model, the schematic embodiment of the utility model and the explanation thereof are used to explain the utility model, and do not constitute improper limitation to the utility model. In the drawings:

[0027] Figure 1 It is the structure whole connection relation schematic diagram of the utility model; DETAILED DESCRIPTION

[0028] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. The embodiment and the features in the embodiment in the application can be combined with each other without conflict. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0029] In the embodiment, refer to Figure 1 .

[0030] As Figure 1As shown in the prior art, the utility model provides a kind of open loop direct current circuit based on distributed energy station, wherein distributed energy station open loop direct current circuit includes two 220V direct currents (I section and II section), and two 220V direct currents (I section and II section) are accessed to screen top small bus through direct current distribution room and high voltage distribution room, and for one 220V direct current (I section), branch I upper switch and branch I lower switch are respectively arranged in direct current distribution room and high voltage distribution room, and for another 220V direct current (II section), branch II upper switch and branch II lower switch are respectively arranged in direct current distribution room and high voltage distribution room.

[0031] At this time, the open loop direct current circuit in the direct current distribution room 220V direct current I, II section bus of distributed energy station (located in direct current distribution room) is respectively supplied with 10kV high voltage distribution cabinet (located in high voltage distribution room) screen top small bus by branch I and branch II, and in normal power supply, it is open loop operation, when branch I operates, branch I upper switch and lower switch are all closed; branch II upper switch is closed, and lower switch is opened; when branch II operates, branch II upper switch and lower switch are all closed; branch I upper switch is closed, and lower switch is opened; in summary, branch I and branch II can only be switched manually at this time, and the switching mode is first manually powered off.

[0032] The open loop direct current circuit has two independent power supply lines (branch I and branch II), so even if one line fails or needs maintenance, the other line can still ensure normal power supply, thereby improving the reliability and stability of the entire system.

[0033] However, the distributed energy station has the following disadvantages in use:

[0034] (1) in open loop operation mode, branch I and branch II can only be switched manually, when the running branch fails to cause power failure, it will cause the screen top small bus of high voltage distribution cabinet to lose power for a long time and not easy to be found, leading to the consequences of 10kV switch protection device power failure, switch cannot trip, etc., seriously affecting the safe operation of equipment;

[0035] (2) branch I and branch II upper and lower switches are not in the same place, and the screen top small bus is located at the top of switch cabinet without voltage monitoring, which is not conducive to intuitive viewing of small bus and switch operation, affects work efficiency and is not easy to find equipment failure;

[0036] (3) When the 220V DC system has a grounding fault, the "power-off" method is used to find the fault point, and the upper switch of the non-operating branch needs to be manually disconnected in the DC distribution room. Since the DC distribution room cannot monitor the state of the lower switch of branch I and branch II in the high-voltage distribution room, it is not possible to confirm which branch is the non-operating branch. It is necessary to confirm on site in the high-voltage distribution room, which takes a long time and seriously affects the speed of fault finding, and there is a great hidden danger.

[0037] Therefore, the present application further provides a DC monitoring device for monitoring the open-loop DC circuit of a distributed energy station. The DC monitoring device includes a monitoring module located in the DC distribution room, which includes a collection unit, a locking unit, a logic unit, an output unit, and a display unit. The collection unit is used to collect switch quantity, analog quantity data, etc.; the locking unit is used to switch between the lower switches of branch I and branch II, and uses the branch I and branch II lower switch split AND gate logic as the locking condition for the logic unit to determine the branch I or branch II lower switch closing behavior; the logic unit is a CPU logic processor; the output unit is a switch quantity output and an alarm signal; and the display unit is a screen picture display, specifically including:

[0038] (1) The collection unit (or data collection I / O unit) is connected with the branch I upper switch, the branch I lower switch, the branch II upper switch, and the branch II lower switch through the auxiliary contact of the switch, and is also connected with the bus voltage connection screen top small bus, for collecting switch quantity, analog quantity data;

[0039] (2) The display unit is provided in two groups and located in the DC distribution room and the high-voltage distribution room respectively. The display unit has screen display function, specifically including a display controller, a display, a NANDFLASH flash memory, and a VRAM memory. In actual use, the display unit displays information graphics through the display. In addition, a touch component can be installed as necessary to perform overall control operation of the monitoring device;

[0040] (3) The logic unit is a CPU logic processor, and the CPU logic processor is connected with an EEPROM memory, an SDROM memory, and a NORFLASH flash memory to perform data logic operation, code storage, etc. In addition, the logic unit is connected with the display unit, the collection unit, the output unit, and the locking unit through the bus buffer. Through the data and conditions of the collection unit and the locking unit, after logic processing, information graphics are displayed on the display unit, and switch quantity output and alarm signals are output from the output unit;

[0041] (4) The output unit is used for switch quantity output and alarm signal;

[0042] (5) Locking unit, used for switching lock between lower-level switches of different branches. The locking unit adopts AND gate logic of lower-level switches of different branches as the locking condition for the logic unit to judge the closing behavior of lower-level switches of different branches.

[0043] In practice, the acquisition unit senses and acquires the bus voltage of the small busbar at the top of the screen and the switching status of each switch, then displays it using the display unit, and coordinates with the logic unit and the interlocking unit to perform different switch opening and closing operations according to the corresponding status, thereby executing the open-loop operation of the corresponding open-loop DC circuit.

[0044] Furthermore, the 220V DC Section I busbar, in the DC distribution room, the upper-level switch of Branch I, in the 220V DC Section I No. 1 cabinet of the DC distribution room, can only be manually operated, and the auxiliary contacts of the switch are connected to the monitoring module. The lower-level switch of Branch I, in the 10kV high-voltage distribution cabinet No. 1 cabinet of the high-voltage distribution room, can be remotely operated electrically, and the auxiliary contacts of the switch are connected to the monitoring module.

[0045] Furthermore, the 220V DC II busbar, in the DC distribution room, the upper-level switch of branch II, in cabinet No. 2 of the 220V DC II section in the DC distribution room, can only be operated manually, and the auxiliary contacts of the switch are connected to the monitoring module. The lower-level switch of branch II, in cabinet No. 2 of the 10kV high-voltage distribution cabinet in the high-voltage distribution room, can be operated remotely electrically, and the auxiliary contacts of the switch are connected to the monitoring module.

[0046] Therefore, by setting up acquisition units, the monitoring module can monitor DC loads located in different places by acquiring switch and analog data, making it convenient to check the equipment operation status and detect faults in a timely manner.

[0047] In one specific embodiment, the monitoring module collects the status of each switch and the bus voltage of the small busbar at the top of the panel through the acquisition unit, which can be viewed on the display unit screen of the monitoring module in both the DC power distribution room and the high-voltage power distribution room. Figure 1 The electrical wiring diagram on the left shows the real-time operating status of each switch and the bus voltage of the small busbar at the top of the panel.

[0048] In one specific embodiment, when branch I is running, the monitoring module detects a voltage drop in the busbar voltage of the small busbar at the top of the screen. After the logic unit makes a judgment, it automatically disconnects the lower-level switch of branch I. When the monitoring module detects that the lower-level switch of branch I is disconnected, it sends a closing command to the lower-level switch of branch II. If the lower-level switch of branch II is successfully closed, the switching ends; if the lower-level switch of branch II is not successfully closed, a tripping command is sent to the lower-level switch of branch II, and the switching is no longer performed. At the same time, an audible and visual alarm signal is issued. It should be noted that the same principle applies when branch II is running.

[0049] In a specific embodiment, when the branch I is running, the monitoring module monitors the sudden tripping of the branch I lower-level switch, automatically issues a tripping instruction to the branch I lower-level switch after logical unit judgment, and issues a closing instruction to the branch II lower-level switch, and if the closing of the branch II lower-level switch is successful, the switching is ended; if the closing of the branch II lower-level switch is not successful, a tripping instruction is issued to the branch II lower-level switch, and the switching is not performed, and a sound and light alarm signal is issued at this time, and it needs to be supplemented that when the branch II is running, the same is true.

[0050] Therefore, for the ring power supply mode of two different DC systems, on the basis of only manual power-off, the automatic switching mode of two power supplies is added, which can prevent closed-loop operation and reduce power-off time, and improve the reliability of DC system power supply.

[0051] In a specific embodiment, when the branch I is running, if the 220V DC II section bus occurs a grounding fault, the fault point can be found by using the "power-off" method, and the branch II upper-level switch can be directly disconnected in the DC distribution room for exclusion, and if the branch II is not grounded, the branch II upper-level switch can be directly closed again, and it needs to be supplemented that when the branch II is running, the same is true.

[0052] Therefore, when finding the grounding fault of the DC system, the time for checking the operation of the equipment is greatly shortened, and the fault point can be quickly found.

[0053] In summary, the monitoring device can automatically switch when the screen top small bus loses power, minimize power-off time, issue an alarm signal to remind the operator to check the site, and also collect the switch states and small bus data of the two locations together, so that the overall operation of the associated equipment can be viewed in real time, faults can be found in time, and when the "power-off" method is used to find the grounding fault of the DC system, the operation of the equipment can be understood at a glance, the switch can be easily and quickly operated, the fault finding efficiency is improved, and the fault can be eliminated as soon as possible.

[0054] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0055] In addition, it needs to be pointed out that if the embodiment of the present application involves directional indication (such as up, down, left, right, front, back, etc.), the directional indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indication also changes accordingly.

[0056] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B scheme. In addition, in the embodiments of the present application, "a plurality of" means more than two. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of such technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A DC monitoring device for an open-loop DC circuit of a distributed energy station, wherein the open-loop DC circuit of the distributed energy station includes two 220V DC circuit branches, and both 220V DC circuits pass through a DC distribution room and a high-voltage distribution room to be connected to the small busbar on the top of the panel for power supply. Each of the two 220V DC circuits is equipped with an upper-level switch and a lower-level switch, wherein the two sets of upper-level switches are located in the DC distribution room and the two sets of lower-level switches are located in the high-voltage distribution room; Its features are, It also includes a monitoring module connected to two 220V DC circuit branches, the monitoring module being used to monitor the DC load; The upstream and downstream switches in the same branch circuit are interlocked and controlled by auxiliary contact switches.

2. The DC monitoring device as described in claim 1, characterized in that, The monitoring module consists of the following units: The acquisition unit is connected to two sets of upstream switches and two sets of downstream switches via auxiliary contact points, and is connected to the small busbar at the top of the panel via busbar voltage. It is used to acquire switch quantity and analog quantity data. Two display units are provided, located in the DC power distribution room and the high-voltage power distribution room respectively, for data display. The logic unit is configured as a CPU logic processor and is connected to the display unit, acquisition unit, output unit, and latching unit via a bus buffer. Output unit, used for digital output and alarm signals; The interlocking unit is used for switching interlocks between lower-level switches of different branches; The interlocking unit uses AND gate logic for different branch lower-level switches as the interlocking condition for judging the closing behavior of different branch lower-level switches.

3. The DC monitoring device as described in claim 1, characterized in that, The logic unit is connected to an EEPROM memory, an SDROM memory, and a NORFLASH flash memory.

4. The DC monitoring device as described in claim 1, characterized in that, The display unit includes a display controller, a display, a NAND flash memory, and a VRAM memory.

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