CN219107056U - Energy storage system off-grid misoperation prevention control device - Google Patents
Energy storage system off-grid misoperation prevention control device Download PDFInfo
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- CN219107056U CN219107056U CN202223330350.3U CN202223330350U CN219107056U CN 219107056 U CN219107056 U CN 219107056U CN 202223330350 U CN202223330350 U CN 202223330350U CN 219107056 U CN219107056 U CN 219107056U
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Abstract
The utility model provides an off-grid misoperation prevention control device of an energy storage system, which comprises the following components: the circuit breaker switching-on circuit comprises a coil of a first circuit breaker and a normally closed contact of a first relay, wherein a normally open main contact of the first circuit breaker is connected in series with the low-voltage wire inlet end, and a first normally open contact of the first circuit breaker connected in series with the low-voltage wire inlet end is connected with an energy storage bidirectional converter; one end of the relay loop is connected with a live wire in the energy storage system loop, the other end of the relay loop is connected with a zero line in the energy storage system loop, and the relay loop comprises a coil of a first relay; the tripping loop is connected with the closing loop of the circuit breaker in parallel. The utility model can reduce the impact on the power grid caused by asynchronous grid connection, and is beneficial to the long-term safe and reliable operation of the energy storage system.
Description
Technical Field
The utility model relates to the field of energy storage systems, in particular to an off-grid misoperation prevention control device of an energy storage system.
Background
The grid-connected operation of the energy storage system generally refers to a mode that the energy storage system is connected with a power grid of the power system and operates in parallel, and at the moment, the frequency, the voltage and the phase of the energy storage system are completely the same as those of the power grid system, and the grid-connected operation is divided into two modes of common grid connection and grid connection but not on the Internet. At present, the power institutions in more places in China are under the action of a policy, and the distributed micro-grid energy storage system is encouraged to adopt an on-site digestion operation mode so as to reduce the impact of the distributed energy storage system on the grid.
When the mains supply is abnormal or fails, an energy storage bidirectional converter (PCS) is shut down in a island protection mode, the PCS needs to be restarted manually when the energy storage system is in off-grid operation, the operation mode is an independent inversion mode, and at the moment, if the grid-connected point circuit breaker is switched on again, the energy of the energy storage system can be sent into a power grid system, and electric shock danger of electric power maintenance personnel can be caused. Meanwhile, when the mains supply is recovered to be normal, the energy storage system has the risk of non-synchronous grid connection (the frequency, the voltage and the phase of the energy storage system are different from those of the power grid system), the existing technical means is to add an anti-reflux device, but the anti-reflux device is installed, only the fundamental wave current is controlled to flow to the power grid, and a small amount of higher harmonic waves flow to the power grid, so that the power grid is influenced to a certain extent, the effect of preventing misoperation cannot be achieved, and long-term safe and reliable operation of the energy storage system is not facilitated. Or the off-grid switching is realized by adding an off-grid switching cabinet, but the cost is higher.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defect that an effective misoperation prevention device is lacking when an energy storage system is switched off the grid in the prior art, so as to provide the off-grid misoperation prevention control device for the energy storage system.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the embodiment of the utility model provides an energy storage system off-grid misoperation prevention control device, which is arranged on a low-voltage wire inlet cabinet or a commercial power receiving cabinet at a client end and comprises: a circuit breaker closing loop, a relay loop and a tripping loop, wherein,
one end of the circuit breaker closing loop is connected with a live wire of a low-voltage wire inlet end, the other end of the circuit breaker closing loop is connected with a zero wire of the low-voltage wire inlet end, the circuit breaker closing loop comprises a coil of a first circuit breaker and a normally closed contact of a first relay, a normally open main contact of the first circuit breaker is connected in series with the low-voltage wire inlet end, and a first normally open contact of the first circuit breaker connected in series with the low-voltage wire inlet end is connected with an energy storage bidirectional converter;
one end of the relay loop is connected with a live wire in the energy storage system loop, the other end of the relay loop is connected with a zero line in the energy storage system loop, the relay loop comprises a coil of a first relay, and the energy storage system loop comprises a second circuit breaker, an energy storage bidirectional converter and an energy storage system which are sequentially connected;
the tripping loop is connected with the breaker closing loop in parallel.
Optionally, the circuit breaker closing circuit further includes: the first fixed contact of the manual switch is connected into the circuit breaker closing loop, the second fixed contact of the manual switch is connected into the off-grid control loop, and the movable contact of the manual switch is connected into the circuit breaker closing loop.
Optionally, the circuit breaker closing circuit further includes: the switching-on button and the first fuse are connected in series into the switching-on loop of the circuit breaker.
Optionally, the relay circuit further comprises: and the second fuse is connected with the coil of the first relay in series.
Optionally, the trip circuit includes: the tripping device comprises a tripping unit and a tripping coil, wherein the tripping unit is connected with the tripping coil in parallel.
Optionally, the energy storage system off-grid misoperation prevention control device further comprises: and a circuit breaker status display circuit including a second normally open contact of the first circuit breaker.
Optionally, the energy storage system off-grid misoperation prevention control device further comprises: and the communication loop is connected with the energy storage bidirectional converter or the monitoring background.
The technical scheme of the utility model has the following advantages:
the utility model provides an off-grid misoperation prevention control device of an energy storage system, which comprises the following components: the circuit breaker switching-on circuit comprises a coil of a first circuit breaker and a normally closed contact of a first relay, wherein a normally open main contact of the first circuit breaker is connected in series with the low-voltage wire inlet end, and a first normally open contact of the first circuit breaker connected in series with the low-voltage wire inlet end is connected with an energy storage bidirectional converter; one end of the relay loop is connected with a live wire in the energy storage system loop, the other end of the relay loop is connected with a zero line in the energy storage system loop, the relay loop comprises a coil of a first relay, and the energy storage system loop comprises a second circuit breaker, an energy storage bidirectional converter and an energy storage system which are sequentially connected; the tripping loop is connected with the closing loop of the circuit breaker in parallel. And when the switching is performed during off-grid switching, a tripping loop is utilized to switch off the first breaker protection in the breaker switching-on loop, and the PCS island protection is stopped. After the PCS is restarted, the relay loop is utilized to ensure that the first breaker cannot be closed again, and misoperation prevention is realized through double protection. Therefore, the safe and effective on-grid switching can be realized, the electric shock danger of the electric power maintainer can not be caused, and the electric safety of the electric power maintainer is ensured. And the impact on the power grid caused by asynchronous grid connection can be reduced, and the long-term safe and reliable operation of the energy storage system is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a grid-connected and off-grid version of a conventional energy storage system according to one specific example of an embodiment of the present utility model;
FIG. 2 is a grid-connected and off-grid version of a conventional energy storage system according to another specific example of an embodiment of the present utility model;
fig. 3 is a schematic diagram of an off-grid anti-misoperation control device of the energy storage system in an embodiment of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the system is a parallel-to-off-grid scheme of a conventional energy storage system. The conventional energy storage system consists of a multi-path battery cluster, a bus cabinet, an energy storage bidirectional converter (PCS), an off-grid switching cabinet and the like. The specific parallel-to-off-grid scheme is as follows: the fast and grid-connected and off-grid switching is realized through an off-grid switching cabinet (contactor or static switch). However, the cost of such a scheme is high, and when the energy storage at the user side is applied, the current situation is that the existing high-low voltage power distribution cabinet of the substation (distribution) at the user side or the circuit breaker switch with the nearby user load is used as the off-grid access point (see fig. 2), and the off-grid switching cabinet is further additionally arranged, so that the cost of the client is increased undoubtedly. In addition, in view of the fact that the existing energy storage system backflow prevention device only controls fundamental current to flow to the power grid, a small amount of higher harmonic waves flow to the power grid, the power grid is affected to a certain extent, and misoperation prevention cannot be achieved.
Therefore, the embodiment of the utility model provides an off-grid misoperation prevention control device of an energy storage system, so as to overcome the defects. The off-grid misoperation prevention control device of the energy storage system is arranged on a low-voltage wire inlet cabinet or a commercial power receiving cabinet of the client.
In an embodiment, as shown in fig. 2 and 3, the off-grid anti-misoperation control device of the energy storage system includes: the circuit breaker switching-on loop, the relay loop and the tripping loop. One end of the circuit breaker closing loop is connected with a live wire L1 of the low-voltage wire inlet end, and the other end of the circuit breaker closing loop is connected with a zero wire N of the low-voltage wire inlet end. The breaker closing loop comprises a coil of a first breaker QF1 and a normally closed contact of a first relay K1, a normally open main contact of the first breaker QF1 is connected in series with a low-voltage wire inlet end, and a first normally open contact of the first breaker QF1 connected in series with the low-voltage wire inlet end is connected with an energy storage bidirectional converter. One end of the relay loop is connected with a live wire L2 in the energy storage system loop, and the other end of the relay loop is connected with a zero line N in the energy storage system loop. The relay circuit includes a coil of the first relay K1. The energy storage system loop comprises a second breaker QF2, an energy storage bidirectional converter PCS and an energy storage system which are sequentially connected. The tripping loop is connected with the closing loop of the circuit breaker in parallel.
In a specific embodiment, as shown in fig. 3, the circuit breaker closing circuit further includes: the first fixed contact of the manual switch is connected into the circuit breaker switching-on loop, the second fixed contact of the manual switch is connected into the off-grid control loop, and the movable contact of the manual switch is connected into the circuit breaker switching-on loop.
Specifically, the off-grid mode and the misoperation prevention control principle are as follows:
1. grid-connected mode:
when the commercial power is on and the first breaker QF1 is not closed, a coil of the first relay K1 in the relay loop is not powered, and a normally closed contact of the coil maintains a closed state. The manual switch rotates to a normal gear (namely, the manual switch is connected into a breaker closing circuit), the first breaker QF1 has a closing condition (namely, the breaker closing circuit has a conducting condition), the closing button SB1 is pressed, the breaker closing circuit is conducted, and the first breaker QF1 is closed. At this time, the first normally open contact of the first breaker QF1 connected in series to the low voltage wire terminal becomes normally closed and leads to the PCS. When the frequency, the voltage and the phase of the energy storage system have presynchronization conditions, the second breaker QF2 at the end of the energy storage system is switched on, the coil of the first relay K1 in the relay loop is electrified, the normally closed contact of the coil is disconnected, and the energy storage system operates in a grid-connected mode. At this time, since the first normally open contact of the first circuit breaker QF1 becomes normally closed and leads to the PCS, the PCS is not allowed to run off-grid.
2. Grid-connected to off-grid mode:
in the grid-connected mode, there are two situations in which it is necessary to switch to the off-grid mode: (1) a large power grid needs maintenance; (2) large grid incidents. In any case, when the commercial power is abnormal or fails, the low-voltage inlet wire end fails, so that the tripping circuit is undervoltage tripped, and then the first breaker QF1 in the breaker closing circuit is used for protecting and opening the gate, and the PCS island is protected and stopped. The energy storage system needs to be connected with the power grid and is switched to run off the power grid, then the PCS needs to be restarted manually, the running mode is an independent inversion mode, at the moment, a circuit in the energy storage system loop is electrified, after a coil of a first relay K1 in the relay loop is electrified, a normally-closed contact of the coil is disconnected, and the first breaker QF1 in the breaker closing loop cannot be closed, so that misoperation prevention is realized. If the manual switch is rotated to the off-grid gear in the off-grid control loop, double misoperation prevention can be realized.
3. Off-grid to grid mode:
in the off-grid mode, if the large power grid fault is eliminated and the power supply is recovered, the PCS needs to detect the pre-synchronization of the commercial power, the off-grid mode is closed, the coil of the first relay K1 in the relay loop is in power failure recovery, the contact is closed again, the manual switch is screwed to a normal gear, the first breaker QF1 has a closing condition, and the system meets the operation of the grid-connected mode.
In an embodiment of the present utility model, as shown in fig. 3, the trip circuit includes: the tripping device comprises a tripping unit and a tripping coil, wherein the tripping unit is connected with the tripping coil in parallel. The normal operation time of the first relay K1 is about 10ms, the circuit operation response is fast, and the working efficiency is improved.
According to the energy storage system off-grid misoperation prevention control device, when the off-grid switching is performed, a tripping loop is utilized to switch off the first breaker protection in a breaker switching-on loop, and PCS island protection is stopped. After the PCS is restarted, the relay loop is utilized to ensure that the first breaker cannot be closed again, and misoperation prevention is realized through double protection. Therefore, the safe and effective on-grid switching can be realized, the electric shock danger of the electric power maintainer can not be caused, and the electric safety of the electric power maintainer is ensured. And the impact on the power grid caused by asynchronous grid connection can be reduced, and the long-term safe and reliable operation of the energy storage system is facilitated.
In an embodiment, as shown in fig. 3, the circuit breaker closing circuit further includes: the switching-on button SB1 and the first fuse FU1, wherein the switching-on button SB1 and the first fuse FU1 are connected in series into a switching-on loop of the circuit breaker.
In a specific embodiment, by adding the switch-on button SB1, the switch-on circuit of the circuit breaker can be manually controlled, and when the circuit breaker is abnormal, the switch-on circuit of the circuit breaker is manually opened, so as to prevent the switch-on circuit of the circuit breaker from being out of control. By additionally arranging the first fuse FU1, overcurrent of a closing loop of the circuit breaker is prevented.
In one embodiment, as shown in fig. 3, the relay circuit further includes: the second fuse FU2, the second fuse FU2 is connected in series with the coil of the first relay K1.
In one embodiment, the relay circuit is prevented from flowing through by adding the second fuse FU 2. Further, the relay loop also comprises a normally open contact KT of the relay K1, which is used for collecting feedback display of the state of an internal action signal (relay) of the off-grid misoperation prevention control device.
In an embodiment, the energy storage system off-grid misoperation prevention control device further comprises: and a circuit breaker state display circuit including a second normally open contact of the first circuit breaker QF 1.
In a specific embodiment, the circuit breaker status display circuit is configured to display the status of the first circuit breaker QF 1. When the second normally open contact of the first breaker QF1 is closed, the first breaker QF1 is represented to be closed; and when the second normally open contact of the first circuit breaker QF1 is in a normally open state, the first circuit breaker QF1 is characterized to be opened.
In an embodiment, as shown in fig. 3, the off-grid anti-misoperation control device of the energy storage system further includes: and the communication loop is connected with the energy storage bidirectional converter or the monitoring background.
In a specific embodiment, the energy storage system and off-line misoperation prevention control device uploads the state of the internal action signal of the device to the PCS or the monitoring background through a communication loop, wherein the communication loop can adopt an RS485 communication protocol.
In an embodiment, the energy storage system off-grid misoperation prevention control device is internally composed of a fuse, an intermediate relay and a manual switch, and meanwhile, the state of action signals in the grid-connected circuit breaker and the device is sampled and monitored on site, and meanwhile, the state of action signals in the grid-connected circuit breaker and the device can be uploaded to a PCS or a monitoring background through RS485 communication. The device has small volume, and can be installed on an embedded panel or a guide rail. The off-grid switching can be realized by adding an anti-misoperation control device based on a low-voltage client wire inlet cabinet (a commercial power receiving cabinet), so that the off-grid anti-misoperation can be realized by modifying the low-voltage client wire inlet cabinet in a minimized and low-cost manner.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications in the various aspects will be apparent to persons of ordinary skill in the art upon reading the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (7)
1. The utility model provides an energy storage system and prevent maloperation controlling means from net, its characterized in that, energy storage system and prevent maloperation controlling means from net installs in low pressure wire inlet cabinet or commercial power cabinet of customer end, energy storage system and prevent maloperation controlling means from net includes: a circuit breaker closing loop, a relay loop and a tripping loop, wherein,
one end of the circuit breaker closing loop is connected with a live wire of a low-voltage wire inlet end, the other end of the circuit breaker closing loop is connected with a zero wire of the low-voltage wire inlet end, the circuit breaker closing loop comprises a coil of a first circuit breaker and a normally closed contact of a first relay, a normally open main contact of the first circuit breaker is connected in series with the low-voltage wire inlet end, and a first normally open contact of the first circuit breaker connected in series with the low-voltage wire inlet end is connected with an energy storage bidirectional converter;
one end of the relay loop is connected with a live wire in the energy storage system loop, the other end of the relay loop is connected with a zero line in the energy storage system loop, the relay loop comprises a coil of a first relay, and the energy storage system loop comprises a second circuit breaker, an energy storage bidirectional converter and an energy storage system which are sequentially connected;
the tripping loop is connected with the breaker closing loop in parallel.
2. The energy storage system off-grid anti-misoperation control device according to claim 1, wherein the breaker closing circuit further comprises: the first fixed contact of the manual switch is connected into the circuit breaker closing loop, the second fixed contact of the manual switch is connected into the off-grid control loop, and the movable contact of the manual switch is connected into the circuit breaker closing loop.
3. The energy storage system off-grid anti-misoperation control device according to claim 2, wherein the breaker closing circuit further comprises: the switching-on button and the first fuse are connected in series into the switching-on loop of the circuit breaker.
4. The energy storage system off-grid anti-misoperation control device according to claim 1, wherein the relay circuit further comprises: and the second fuse is connected with the coil of the first relay in series.
5. The energy storage system off-grid anti-misoperation control device according to claim 1, wherein the trip loop comprises: the tripping device comprises a tripping unit and a tripping coil, wherein the tripping unit is connected with the tripping coil in parallel.
6. The off-grid anti-misoperation control device of an energy storage system according to claim 1, further comprising: and a circuit breaker status display circuit including a second normally open contact of the first circuit breaker.
7. The off-grid anti-misoperation control device of an energy storage system according to claim 1, further comprising: and the communication loop is connected with the energy storage bidirectional converter or the monitoring background.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202223330350.3U CN219107056U (en) | 2022-12-12 | 2022-12-12 | Energy storage system off-grid misoperation prevention control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223330350.3U CN219107056U (en) | 2022-12-12 | 2022-12-12 | Energy storage system off-grid misoperation prevention control device |
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| CN219107056U true CN219107056U (en) | 2023-05-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117728558A (en) * | 2024-02-18 | 2024-03-19 | 合肥联信电源有限公司 | Spare peak clipping, activating and capacity increasing multi-redundancy power distribution system |
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2022
- 2022-12-12 CN CN202223330350.3U patent/CN219107056U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117728558A (en) * | 2024-02-18 | 2024-03-19 | 合肥联信电源有限公司 | Spare peak clipping, activating and capacity increasing multi-redundancy power distribution system |
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